JAEA Abstracts

-Research results below have been sorted by order of journals name.

-Sorry, some research results below have no English abstract.

December 2009

37001471
Ferromagnetism and microstructure in Fe⁺-implanted ZnO
Wang, D.*; Chen, Z. Q.*; Zhou, F.*; Lu, W.*; Maekawa, Masaki; Kawasuso, Atsuo
Applied Surface Science 255(23), p.9371-9375(2009) ; (JAEA-J 06470)

We investigated iron-implanted ZnO by various methods. Photoluminescence measurements showed the introduction of non-radiative recombination centers. Raman scattering measurements showed the introduction of damages that distor the crystal symmetry. These defects were annealed out at 700°C. X-ray diffraction and magnetization measurements revealed the formation of iron nano-crystal and appearance of ferromagnetism accompanying the above heat treatment.

37001472
Anionic fluoro complex of element 105, Db
Kasamatsu, Yoshitaka*; Toyoshima, Atsushi; Asai, Masato; Tsukada, Kazuaki; Li, Z.; Ishii, Yasuo; Tome, Hayato*; Sato, Tetsuya; Kikuchi, Takahiro; Nishinaka, Ichiro; Nagame, Yuichiro; Haba, Hiromitsu*; Kikunaga, Hidetoshi*; Kudo, Yuki*; Oura, Yasuji*; Akiyama, Kazuhiko*; Sato, Wataru*; Oe, Kazuhiro*; Fujisawa, Hiroyuki*; Shinohara, Atsushi*; Goto, Shinichi*; Hasegawa, Taichi*; Kudo, Hisaaki*; Nanri, Tomohiro*; Araki, Mikio*; Kinoshita, Norikazu*; Yokoyama, Akihiko*; Fan, F.*; Qin, Z.*; Düllmann, C. E.*; Schädel, M.*; Kratz, J. V.*
Chemistry Letters 38(11), p.1084-1085(2009) ; (JAEA-J 06471)

We report on the characteristic anion-exchange behavior of the superheavy element dubnium (Db) with atomic number Z = 105 in HF/HNO₃ solution at the fluoride ion concentration [F^-] = 0.003 M. The result clearly demonstrates that the fluoro complex formation of Db is significantly different from that of the group-5 homologue Ta in the 6th period of the periodic table while the behavior of Db is similar to that of the lighter homologue Nb in the 5th period.

37001473
Recovery of gold with Japanese cedar wood powder
Parajuli, D.; Hirota, Koichi
ChemSusChem 2(10), p.965-967(2009) ; (JAEA-J 06472)

Japanese cedar wood powder (CWP) was studied for the recovery of Au(III) from acidic aqueous solution. Changing the physical morphology of CWP by grinding to finer particles induced the sorption efficiency and solo selectivity for Au(III) on basically non sorptive matrix. The stability and significant loading capacity of CWP for gold ion without performing any chemical modification are the important results making it a 100% green biosorbent. Continuous reduction of Au(III) to gold microplates even after separation from CWP shows new research dimensions in addition to the ease of gold isolation without going through the burdens of elution and reduction. In addition, preliminary results of preparation of stable gold nano particles using γ-ray irradiated CWP-extract are also explained.

37001474
Metal co-adsorption induced √21×√21 superstructure on Si(111) surface studied by reflection high-energy positron diffraction
Fukaya, Yuki; Matsuda, Iwao*; Hashimoto, Mie; Narita, Hisashi*; Kawasuso, Atsuo; Ichimiya, Ayahiko
e-Journal of Surface Science and Nanotechnology (Internet) 7, p.432-435(2009) ; (JAEA-J 06473)

37001475
Phase transition of In/Si(111) surface studied by reflection high-energy positron diffraction
Hashimoto, Mie; Fukaya, Yuki; Kawasuso, Atsuo; Ichimiya, Ayahiko
e-Journal of Surface Science and Nanotechnology (Internet) 7, p.436-440(2009) ; (JAEA-J 06474)

37001476
Control of laser-accelerated proton beams by modifying the target density with ASE
Yogo, Akifumi; Kiriyama, Hiromitsu; Mori, Michiaki; Esirkepov, T. Z.; Ogura, Koichi; Sagisaka, Akito; Orimo, Satoshi; Nishiuchi, Mamiko; Pirozhkov, A. S.; Nagatomo, Hideo*; Nakai, Yoshiki; Shimomura, Takuya; Tanoue, Manabu*; Akutsu, Atsushi; Okada, Hajime; Motomura, Tomohiro*; Kondo, Shuji; Kanazawa, Shuhei; Bulanov, S. V.; Bolton, P.; Daido, Hiroyuki
European Physical Journal D 55(2), p.421-425(2009) ; (JAEA-J 06475)

We demonstrate the laser-ion acceleration from a near-critical density plasma, when amplified spontaneous emission (ASE) was used to convert a solid foil target into the lower-density target. In this work, a direct comparison is made by changing the ASE intensity by factor 3 in order to investigate the target density-dependency of the laser-ion acceleration. The beam direction of high-energy component is successfully controlled by modifying the target density. The near-critical density plasma can be a favorable target to control the beam direction to be dependent on its energy.

37001477
Procurement preparation of ITER key components by JADA
Yoshino, Ryuji
Fusion Science and Technology 56(1), p.20-28(2009) ; (JAEA-J 06476)

The Japanese Government designated JAEA as the Domestic Agency of Japan (JADA) just after the entry into force of the ITER Agreement on 24th Oct. 2007. JADA has about 80 persons at Naka-site to carry out the in kind procurement in the ITER Project, and administrative departments in JAEA do jobs necessary for the procurement. According to the Common Understandings on Procurement Allocation, in kind procurements of JADA is about 16% of the total: about a half of superconducting toroidal field (TF) coils (25% of conductors, 100% of structures, 9 windings, case assembly of 9 coils), 100% of conductors for central solenoid coils, the remote handling equipment for shield blankets, high voltage parts of the neutral beam heating system (power supplies, bushing, beam accelerator, etc), 8 gyrotrons and one equatorial launcher for EC heating system, 10% of first wall panels on the shield blanket, 100% of the outer divertor target plate, the atmosphere detritiation system (ADS) in the tritium plant, and some basic diagnostics. The first procurement arrangement for 25% of TF superconductors (Nb₃Sn) was concluded on 28th November 2007 between the ITER Organization and JADA.

37001478
High thermoelectric performance of metal-substituted samples of α-Fe₂O₃ and computation of their electronic structures by the DV-Xα method
Sugihara, Sunao*; Suzuki, Chikashi; Kameya, Ryohei*
International Journal of Quantum Chemistry 109(12), p.2788-2792(2009) ; (JAEA-J 06477)

37001479
X-ray diffraction topography of BaTiO₃ at phase transition temperature
Yoneda, Yasuhiro; Komura, Yoshiki*; Suzuki, Yoshio*
Japanese Journal of Applied Physics 48(9), p.09KF01_1-09KF01_5(2009) ; (JAEA-J 06478)

We performed X-ray diffraction topography analysis on a BaTiO₃ single crystal with high-coherence synchrotron X-rays. Since the domain configuration of the BaTiO₃ single crystal was unstable and fluctuated with temperature, an excellent temperature control system was used for domain observation. We used a milli-Kelvin (mK)-stabilized cell, which can control BaTiO₃ crystal temperature to within ±1 mK. By combining the coherent X-rays and the mK-stabilized cell, one can detect the domain configuration very sensitively during phase transition. The domain configuration changed markedly at the transition temperature. The low-temperature tetragonal domain fluctuated greatly before the long-range-order structure changed from tetragonal to cubic. The ferroelectric-to-paraelectric transition occurred in two steps; first, the domain configuration changed in the tetragonal phase, and then, the average structure changed to the cubic structure.

37001480
Investigation of polyamorphism in compressed B₂O₃ glass by the direct measurement of the density
Brazhkin, V. V.*; Tsiok, O. B.*; Katayama, Yoshinori
JETP Letters 89(5), p.244-248(2009) ; (JAEA-J 06479)

Relative volume change of vitreous B₂O₃ have been precisely measured by the strain-gauge technique at hydrostatic pressures up to 9 GPa. Smeared anomalies of compressibility (at P > 0.5 GPa and P > 5 GPa) and logarithmic relaxation of the glass density are observed. It has been revealed that there is a significant difference between the relaxed bulk modulus of glass obtained from the volume measurements and the unrelaxed modulus estimated from the Brillouin spectroscopic data. The basic features of the phase transitions in B₂O₃ glass is revealed by the measurements of the relative volume change under compression together with the previous structure investigations and computer simulation results. Both direct and reverse transitions are smeared in pressure. The residual densification in glass is not associated with change in the short-range order.

37001481
Electron spin resonance study on H₆⁺, H₅D⁺, H₄D₂⁺, and H₂D₄⁺ in solid parahydrogen
Kumagai, Jun*; Inagaki, Hiroshi*; Kariya, Susumu*; Ushida, Takahiro*; Shimizu, Yuta*; Kumada, Takayuki
Journal of Chemical Physics 127(2), p.024505_1-024505_13(2009) ; (JAEA-J 06480)

We carried out an electron spin resonance (ESR) study on hydrogen ion radicals produced by radiolysis of solid parahydrogen. In addition to quartet ESR lines proposed to be H₂⁺-core H₆⁺ ions in solid parahydrogen, we newly observed totally more than fifty resolved lines in γ-ray irradiated solid para-H₂-ortho-D₂ (1 mol %) and para-H₂-HD (1 mol %) mixtures. We assigned these lines to be isotope substituents of H₂⁺-core H₆⁺ ions such as H₅D⁺, H₄D₂⁺, and H₂D₄⁺ throughout comparison of their ESR parameters with theoretical results.

37001482
Polyamorphism in tin tetraiodide
Fuchizaki, Kazuhiro*; Hase, Takaki*; Yamada, Akihiro*; Hamaya, Nozomu*; Katayama, Yoshinori; Funakoshi, Kenichi*
Journal of Chemical Physics 130(12), p.121101_1-121101_4(2009) ; (JAEA-J 06481)

In situ synchrotron X-ray diffraction measurements on tin tetraiodide, which consists of SnI₄ tetrahedral molecules at ambient pressure, have been performed. It was established that the liquid forms existing above and below 1.5 GPa, where the slope of the melting curve of the solid phase changes abruptly, have different structures. This discovery offers evidence of thermodynamically stable polyamorphism in general compounds as well as in elements. A possible phase diagram that includes the two amorphous states already found is proposed based on the pseudobinary regular solution model. The vertex-to-face orientation between the nearest molecules plays a key role in the transition from the low-pressure to the high-pressure liquid phase.

37001483
Quantum control study of multilevel effect on ultrafast isotope-selective vibrational excitations
Kurosaki, Yuzuru; Yokoyama, Keiichi; Yokoyama, Atsushi
Journal of Chemical Physics 131(14), p.144305_1-144305_9(2009) ; (JAEA-J 06482)

Quantum optimal control calculations have been carried out for isotope-selective vibrational excitations of the cesium iodide (CsI) molecule. Considering a gaseous isotopic mixture of ¹³³CsI and ¹³⁵CsI, the initial state is set to the condition that both ¹³³CsI and ¹³⁵CsI are in the vibrational ground level (ν = 0) and the target state is that ¹³³CsI is in the ν = 0 level while ¹³⁵CsI in the first-excited level (ν = 1). We find, using the density-matrix formalism, that perfect isotope-selective excitations for multilevel systems including more than ten lowest vibrational states can be completed in much shorter time scales than those for two-level systems. This multilevel effect comes from the large isotope shifts of the vibrational levels of ν > 1. To check the reliability of the calculation we also employ the conventional wave-packet formalism and obtain almost the same results as those with the density-matrix formalism.

37001484
Recovery of palladium using chemically modified cedar wood powder
Parajuli, D.; Hirota, Koichi
Journal of Colloid and Interface Sciences 338(2), p.371-375(2009) ; (JAEA-J 06483)

Japanese cedar wood powder (CWP) was chemically modified to tertiary amine type adsorbent and studied for the selective recovery of Pd(II) from various industrial waters. Batch adsorption tests were performed from 0.1 M to 5 M HCl and HNO₃ conditions. The maximum loading capacity for Pd(II) studied in 0.1, 1, 3, and 5 M HCl conditions were evaluated as 1.4, 0.81, 0.36, and 0.26 mol/kg, respectively. And in 3 M HNO₃ condition it was 0.6 mol/kg. Recovery of Pd(II) from real industrial solution was also performed where only Pd(II) was selectively loaded on modified CWP and was recovered using acidic thiourea with about 95 % recovery factor and 75 times preconcentration factor. Since, Pd(II) adsorption was found to be better in HNO₃, the possibility of its application on the recovery of Palladium from high level liquid waste (HLW) was also studied. For this, simulated HLW prepared in 3 M HNO₃ was used. The adsorption experiment was conducted in normal and in γ irradiation conditions. Interestingly, selective separation of Pd(II) was achieved with the capacities of 0.47 mol/kg in normal condition and 0.4 mol/kg for adsorption mixture irradiated for 200 h at a dose rate of 10 kGy/h.

37001485
Appropriate formulations for velocity and pressure calculations at gas-liquid interface with collocated variable arrangement
Ito, Kei; Kunugi, Tomoaki*
Journal of Fluid Science and Technology (Internet) 4(3), p.711-722(2009) ; (JAEA-J 06484)

A high-precision simulation algorithm for gas-liquid two-phase flows on unstructured meshes has been developed to simulate gas entrainment phenomenon in a sodium-cooled fast reactor. In this study, it became clear that unphysical behaviors near gas-liquid interfaces were caused by conventional algorithms. Then, physics-basis considerations were conducted for mechanical balances at gas-liquid interfaces to derive appropriate formulations for velocity and pressure. As the validation test, the rising gas bubble in liquid was simulated by the developed simulation algorithm with the physically appropriate formulations, and the simulated terminal bubble shapes on the structured and highly-distorted unstructured meshes coincided with the experimental data under each simulation condition.

37001486
Electro-electrodialysis of HI-I₂-H₂O mixture using radiation-grafted polymer electrolyte membranes
Tanaka, Nobuyuki; Yamaki, Tetsuya; Asano, Masaharu; Maekawa, Yasunari; Onuki, Kaoru
Journal of Membrane Science 346(1), p.136-142(2010) ; (JAEA-J 06485)

In the thermochemical water-splitting Iodine-Sulfur process used to produce hydrogen new polymer electrolyte membranes were applied in an electro-membrane process (Electro-electrodialysis, EED) to increase the HI molality of HIx solution (HI-I₂-H₂O mixture) to be over quasi-azeotropic. Radiation grafting of a styrene monomer into a poly (ethylene-co-tetrafluoroethylene) base film and subsequent sulfonation provided electrolyte membranes that had ion exchange capacities (IECs) of 1.1-1.6 mmol/g. With the EED of the HIx solutions using [HI]=[I₂]=10 mol/kg at 40 °C the transport number of protons, ratio of permeated quantities of water to the protons, and current efficiency all appeared to depend on the IEC of the resulting membranes. When compared to Nafion the tested membranes exhibited lower electric cell resistance, and thereby decreasing the overall energy required in the concentration operation.

37001487
Multilevel effect on ultrafast isotope-selective vibrational excitations; Quantum optimal control study
Kurosaki, Yuzuru; Yokoyama, Keiichi; Yokoyama, Atsushi
Journal of Molecular Structure (THEOCHEM) 913(1-3), p.38-42(2009) ; (JAEA-J 06486)

We demonstrate, using optimal control theory, that perfect isotope-selective molecular vibrational excitations on the ground-state potential curve in multilevel systems can be completed in much shorter time scales than those in two-level systems. We consider a gaseous isotopic mixture of cesium iodide (¹³³CsI and ¹³⁵CsI) and, using two-level and multilevel systems, try to obtain electric fields that drive different isotopes into different vibrational levels. As a result, we find that in multilevel systems isotope-selective excitation processes can be controlled much faster, which we call multilevel effect. It is likely that this effect makes use of the large isotope shifts of higher vibrational levels than the lowest two.

37001488
Solubility of uranyl nitrate precipitates with N-Alkyl-2-pyrrolidone derivatives (Alkyl = n-propyl, n-butyl, iso-butyl, and cyclohexyl)
Takao, Koichiro*; Noda, Kyoko*; Nogami, Masanobu*; Sugiyama, Yuichi*; Harada, Masayuki*; Morita, Yasuji; Nishimura, Kenji*; Ikeda, Yasuhisa*
Journal of Nuclear Science and Technology 46(10), p.995-999(2009) ; (JAEA-J 06487)

We have been developing an advanced reprocessing system for spent FBR fuels based on precipitation method using pyrrolidone derivatives. In the present study, the solubility of UO₂(NO₃)₂(NRP)₂ (NRP = N-alkyl-2-pyrrolidone, alkyl = n-propyl, n-butyl, iso-butyl and cyclohexyl) in aqueous solutions with HNO₃ has been examined. As a result, the solubility of each species of UO₂(NO₃)₂(NRP)₂ generally decreases with increasing concentrations of HNO₃ and NRP (C(HNO₃) and C(NRP), respectively). The solubility of UO₂(NO₃)₂(NRP)₂ also depends on the type of NRP; a higher hydrophobicity of NRP generally leads to a lower solubility of UO₂(NO₃)₂(NRP)₂. The logarithms of effective solubility products (K_eff) of UO₂(NO₃)₂(NRP)₂ at different C(HNO₃) values and 293 K were evaluated.

37001489
Stress intensity factor at the tip of cladding incipient crack in RIA-simulating experiments for high burnup PWR fuels
Udagawa, Yutaka; Suzuki, Motoe; Sugiyama, Tomoyuki; Fuketa, Toyoshi
Journal of Nuclear Science and Technology 46(10), p.1012-1021(2009) ; (JAEA-J 06488)

RIA-simulating experiments for high burnup PWR fuels have been performed in the NSRR and stress intensity factor K_I I at the tip of cladding incipient crack has been evaluated in order to investigate its validity as a PCMI failure threshold in RIA conditions. An incipient crack depth was determined by observation of the metallographs. Hoop stress in cladding periphery during the pulse power transient was calculated by the RANNS code. Failure in elastic deformation range has never occurred with K_I of less than 17 MPa m^1/2.

37001490
EUV spectra from highly charged tin ions observed in low density plasma in LHD
Suzuki, Chihiro*; Kato, Takako*; Sato, Kuninori*; Tamura, Naoki*; Kato, Daiji*; Sudo, Shigeru*; Yamamoto, Norimasa*; Tanuma, Hajime*; Ohashi, Hayato*; Suda, Shintaro*; O'Sullivan, G.*; Sasaki, Akira
Journal of Physics; Conference Series 163, p.012019_1-012019_4(2009) ; (JAEA-J 06491)

We have measured EUV spectra from highly charged tin ions in low density plasmas produced in the Large Helical Device (LHD). The well known dense spectral structure around 13.5 nm is measured when the plasma is rapidly cooled and approaching radioactive collapse, while the sparse spectrum with several unidentified discrete lines from 13.8-14.6 nm is observed if the plasma is cooled more slowly. The dominant charge states in the former case are Sn¹¹⁺ -Sn¹⁴⁺. The latter case may be explained by considering the spectral lines from charge states higher than Sn¹⁹⁺.

37001491
Complementary spectroscopy of tin ions using ion and electron beams
Ohashi, Hayato*; Suda, Shintaro*; Tanuma, Hajime*; Fujioka, Shinsuke*; Nishimura, Hiroaki*; Nisihara, Katsunobu*; Kai, Takeshi; Sasaki, Akira; Sakaue, Hiroyuki*; Nakamura, Nobuyuki*; Otani, Shunsuke*
Journal of Physics; Conference Series 163, p.012071_1-012071_4(2009) ; (JAEA-J 06492)

Extreme ultra-violet (EUV) emission spectra of multiply charged tin ions were measured in the wavelength range of 10-22 nm following charge exchange collisions or the electron impact excitation of tin ions. In charge exchange collisions, we observed both the resonance lines and the emission lines corresponding to the transitions between the excited states. On the other hand, we observed mainly the resonance lines in the electron impact experiments. We can distinguish the resonance lines from other emission lines in the charge exchange spectrum by comparison with the emission lines in the electron impact spectrum.

37001492
Optical emission spectroscopy of excited atoms sputtered on a Ti surface under irradiation with multicharged Ar ions
Motohashi, Kenji*; Saito, Yuichi; Kitazawa, Sin-iti
Journal of Physics; Conference Series 163, p.012079_1-012079_4(2009) ; (JAEA-J 06493)

Optical emission spectroscopy of excited atoms was carried out in order to investigate the sputtering processes on solid surfaces under irradiation of slow, multicharged ions. Many atomic lines of Ti I (neutral) and Ti II (single-charged ions) were observed in wavelengths from 250 to 750 nm with irradiation by Ar³⁺ (30 keV) on a Ti surface which was placed in a low pressure O₂ atmosphere. The emission intensity of Ti I (520 nm) decreased monotonically with an increase of O₂ partial pressure, whereas that of Ti I / II (670 nm, a 2^nd order wavelength of 335 nm) slightly increased. From a semi-logarithmic plot of emission intensity for the 670 nm spectrum as a function of distance from the surface, the mean velocity of the excited Ti atoms and ions in a normal direction parallel to the surface, or <v_⊥>, is estimated.

37001493
Combined high-resolution neutron and X-ray analysis of inhibited elastase confirms the active-site oxyanion hole but rules against a low-barrier hydrogen bond
Tamada, Taro; Kinoshita, Takayoshi*; Kurihara, Kazuo; Adachi, Motoyasu; Ohara, Takashi; Imai, Keisuke*; Kuroki, Ryota; Tada, Toshiji*
Journal of the American Chemical Society 131(31), p.11033-11040(2009) ; (JAEA-J 06494)

To help resolve long-standing questions regarding the catalytic activity of the serine proteases the structure of porcine pancreatic elastase has been analyzed by high-resolution neutron and X-ray crystallography. In order to mimic the tetrahedral transition intermediate a peptidic inhibitor was used. A single large crystal was used to collect room-temperature neutron data to 1.65 Å resolution and X-ray data to 1.20 Å resolution. Another crystal provided a low-temperature X-ray data set to 0.94 Å resolution. The neutron data are to higher resolution than previously reported for a serine protease and the X-ray data are comparable with other studies. The neutron and X-ray data show that the hydrogen bond between His57 and Asp102 (chymotrypsin numbering) is 2.60 Å in length and that the hydrogen-bonding hydrogen is 0.80-0.96 Å from the histidine nitrogen. This is not consistent with a low-barrier hydrogen which is predicted to have the hydrogen midway between the donor and acceptor atom. The observed interaction between His57 and Asp102 is essentially a short but conventional hydrogen bond, sometimes described as a short ionic hydrogen bond. The neutron analysis also shows that the oxygen of the oxopropyl group of the inhibitor is present as an oxygen anion rather than a hydroxyl group, supporting the role of the "oxyanion hole" in stabilizing the tetrahedral intermediate in catalysis.

37001494
First demonstration of novel method for inelastic neutron scattering measurement utilizing multiple incident energies
Nakamura, Mitsutaka; Kajimoto, Ryoichi; Inamura, Yasuhiro; Mizuno, Fumio; Fujita, Masaki*; Yokoo, Tetsuya*; Arai, Masatoshi
Journal of the Physical Society of Japan 78(9), p.093002_1-093002_4(2009) ; (JAEA-J 06495)

We succeeded in experimentally demonstrating that a series of two-dimensional maps of a dynamical structure factor in momentum-energy space with multiple incident energies can be simultaneously obtained by one measurement. This method reduces the dead time of time-of-flight measurement, and thus it markedly increases the measurement efficiency. Our achievement realized using the Fermi chopper spectrometer 4SEASONS in J-PARC is expected to open up new possibilities of inelastic neutron scattering measurements.

37001495
First-principles local-density approximation study of electronic structure in CeCoSi₂
Yasui, Akira; Yamagami, Hiroshi; Im, H. J.*
Journal of the Physical Society of Japan 78(10), p.104705_1-104705_4(2009) ; (JAEA-J 06496)

The first-principles band calculation of an itinerant cerium compound CeCoSi₂ is performed using a relativistic LAPW method with exchange and correlation potentials within a local-density approximation (LDA). The c-f hybridized bands with a large dispersion form two-dimensional Fermi surface (FS). The FS formation and the band dispersion including the contribution from each orbital obtained by the LDA calculation are in a qualitatively agreement with Ce 3d-4f resonant angle-resolved photoemission spectra. The LDA calculation is a good starting point for the investigation of the electronic structure of the heavy-fermion Ce compounds.

37001496
Possible existence of magnetic polaron in nearly ferromagnetic semiconductor β-US₂
Ikeda, Shugo*; Sakai, Hironori; Tateiwa, Naoyuki; Matsuda, Tatsuma; Aoki, Dai*; Homma, Yoshiya*; Yamamoto, Etsuji; Nakamura, Akio; Shiokawa, Yoshinobu*; Ota, Yuki*; Sugiyama, Kiyohiro*; Hagiwara, Masayuki*; Kindo, Koichi*; Matsubayashi, Kazuyuki*; Hedo, Masato*; Uwatoko, Yoshiya*; Haga, Yoshinori; Onuki, Yoshichika
Journal of the Physical Society of Japan 78(11), p.114704_1-114704_10(2009) ; (JAEA-J 06497)

We studied the magnetic properties of a paramagnet β-US₂ with the orthorhombic crystal structure by measuring the magnetization, magnetic susceptibility, specific heat and electrical resistivity under magnetic field and pressure. The 5f-crystalline electric field (CEF) scheme was determined from the experimental results The insulating resistivity is drastically changed to a metallic one under high pressure 8 GPa similar to that of the semimetallic Ising-type ferromagnet UTeS with the Curie temperature T_C=87 K. From these experimental results, it was concluded that β-US₂ is in the vicinity of the ferromagnetic ordering at ambient pressure. The anomalous magnetization was analyzed on the basis of the ferromagnetic cluster and discussed from a viewpoint of the magnetic polaron.

37001497
Growth and characterization of bismuth magnesium titanate Bi(Mg_1/2Ti_1/2)0₃
Yoneda, Yasuhiro; Saito, Hiroyuki; Yoshii, Kenji; Nishida, Takashi*; Hayakawa, Hironori*; Ikeda, Naoshi*
Key Engineering Materials 421-422, p.30-33(2010) ; (JAEA-J 06498)

Polycrystalline Bi(Mg_1/2Ti_1/2)O₃ samples were prepared under high pressure. A mixed powder of Bi₂O₃, Ti₂O₃ and MgO with a prescribed ratio was packed into platinum cell and was heated a cubic anvil-type apparatus at 6.5 GPa and 1000 °C. The obtained samples were characterized by powder X-ray diffraction measurements. Although some impurity peaks existed, the main peaks were perovskite peaks. The structure of Bi(Mg_1/2Ti_1/2)O₃ is rhombohedral, as well as BiFeO₃. The D-E hysteresis loop was not saturated due to the impurities, but the possibility as ferroelectric can be expected enough.

37001498
An STM for molecules and wide-bandgap crystal
Akagi, Hiroshi; Arissian, L.*; Bertrand, J. B.*; Corkum, P. B.*; Gertsvolf, M.*; Pavicic, D.*; Rayner, D. M.*; Smeenk, C.*; Staudte, A.*; Villeneuve, D. M.*; Wörner, H. J.*
Laser Physics 19(8), p.1697-1704(2009) ; (JAEA-J 06499)

The paper is divided into four sections. In the first, using atomic ionization as the example, we describe how we can make measurements without re-collision. In the second section we show one approach to measuring the tunnelling probability as a function of molecular alignment using a correlation method. The third section concentrates on how small molecules can be aligned with short laser pulses. Once molecules can be aligned, we can also measure the tunnelling rate as a function of alignment by measuring the ionization probability with linearly polarized light. We use Br₂ and N₂ as examples. Finally we complete the circle, returning to solids. A traditional STM is confined to the surface of solids. Laser radiation does not suffer from this limitation in large band gap materials. One might expect that the ionization probability would change as a function of the angle between the light polarization and the crystal axis much as it does for a molecule. We complete our review by demonstrating that tunnelling can be used to identify the symmetry of a crystal - with micron spatial precision - anywhere in the bulk.

37001499
Temperature dependence of corrosion of ferritic/martensitic and austenitic steels in liquid lead-bismuth eutectic
Kurata, Yuji; Saito, Shigeru
Materials Transactions 50(10), p.2410-2417(2009) ; (JAEA-J 06501)

Corrosion tests of ferritic/martensitic (F/M) , austenitic stainless and Si-added austenitic steels were conducted at 450 to 600°C for 2000h or 3000h in oxygen-saturated lead-bismuth eutectic (LBE) to clarify temperature effect on corrosion behavior. While the corrosion depth is small at 450°C because of oxide film formation with low growth rate, it increases at 500°C due to additional grain boundary corrosion/internal oxidation and node formation. At 550°C, grain boundary corrosion/internal oxidation is recognized extensively in F/M steels. Ferritization characterized by selective dissolution of Ni and Cr, and LBE penetration occurs in JPCA and 316SS. Corrosion attack becomes very severe for most steels at 600°C. LBE penetration follows grain boundary corrosion/internal oxidation in F/M steels and ferritization advances deeply in JPCA and 316SS. Addition of Si to austenitic steels is useful to improve corrosion resistance.

37001500
Total recovery of gold, palladium, and platinum using lignophenol derivative
Parajuli, D.; Khunathai, K.*; Adhikari, C. R.*; Inoue, Katsutoshi*; Oto, Keisuke*; Kawakita, Hidetaka*; Funaoka, Masamitsu*; Hirota, Koichi
Minerals Engineering 22(13), p.1173-1178(2009) ; (JAEA-J 06502)

A tertiary amine type adsorption gel was prepared by the immobilization of dimethylamine onto crosslinked lignophenol (CLP) matrix. This novel product was studied for its adsorption behavior for Au(III), Pd(II), Pt(IV), Cu(II), Zn(II), Ni(II), and Fe(III) in 0.5 to 6 M hydrochloric acid medium. The result demonstrated adsorption selectivity for Au(III), Pd(II), and Pt(IV). The maximum loading capacity for these three metal ions was evaluated by isotherm study. For Au(III) an impressive value of 7.2 mol/kg of DMA-CLP was observed. The feasibility of recovery of precious metals from a mixture containing several other metal ions was studied in batch mode by using both model solution and actual industrial solution obtained after aquaregia leaching of metal components in obsolate e-devices. In addition, a number of adsorption-elution cycles were produced so as to know the feasibility of multiple uses.

37001501
Biological consequences of potential repair intermediates of clustered base damage site in Escherichia coli
Shikazono, Naoya; O'Neill, P.*
Mutation Research; Fundamental and Molecular Mechanisms of Mutagenesis 669(1-2), p.162-168(2009) ; (JAEA-J 06503)

To gain insights into the processing of bistranded base lesions, several potential repair intermediates following 8-oxoG removal from bistranded clusters containing 8-oxoG and DHT were assessed. Clusters, such as DHT/AP and DHT/GAP have relatively low mutation frequencies, whereas clusters, such as AP/AP or GAP/AP, significantly reduce the number of transformed colonies, most probably through formation of a lethal DSB. These results suggest that bistranded base lesions, but not clusters containing only AP sites and strand breaks, are repaired in a coordinated manner so that the formation of DSBs is avoided. We propose that, when either base lesion is initially excised from a bistranded base damage site, the remaining base lesion will only rarely be converted into an AP site or a single strand break in vivo.

37001502
The impact of the current density profile on heat transport and pedestal structure in JT-60U
Urano, Hajime; Sakamoto, Yoshiteru; Suzuki, Takahiro; Fujita, Takaaki; Kamiya, Kensaku; Isayama, Akihiko; Kamada, Yutaka; Takenaga, Hidenobu; Oyama, Naoyuki; Matsunaga, Go; Ide, Shunsuke; Idomura, Yasuhiro; JT-60 Team
Nuclear Fusion 49(9), p.095006_1-095006_7(2009) ; (JAEA-J 06504)

H-modes operated at higher l_i with the current ramp down have shown higher energy confinement with higher density in JT-60U. The H-factor evaluated for the core plasma depends strongly on l_i with the relation of H_89core ∝ l_i^0.8 for the case without sawtooth activities. Center peaked profiles of electron density and electron temperature are obtained in high l_i H-modes. The pedestal pressure is not significantly changed. The enhanced energy confinement in high l_i H-modes is attributed to the core improvement with the peaked profiles of electron density and temperature. The electron heat diffusivity is reduced at the plasma core in high l_i case, resulting in the center peaked T_e profile while the T_i profiles are approximately unchanged.

37001503
Development of reversed shear plasmas with high bootstrap current fraction towards reactor relevant regime in JT-60U
Sakamoto, Yoshiteru; Matsunaga, Go; Oyama, Naoyuki; Suzuki, Takahiro; Aiba, Nobuyuki; Takenaga, Hidenobu; Isayama, Akihiko; Shinohara, Koji; Yoshida, Maiko; Takechi, Manabu; Fujita, Takaaki; Ide, Shunsuke; Koide, Yoshihiko; Kamada, Yutaka; JT-60 Team
Nuclear Fusion 49(9), p.095017_1-095017_8(2009) ; (JAEA-J 06505)

This paper reports the recent development of reversed shear plasmas with a high bootstrap current fraction towards reactor relevant regime, especially lower q₉₅ regime. By utilizing large volume configuration close to the conductive wall for wall stabilization, the beta limit of the reversed shear plasmas is significantly improved. As a result, high confinement reversed shear plasmas with high bootstrap current fraction exceeding no-wall beta limit are obtained in reactor relevant regime, where β_N of 2.7, β_P of 2.3 is achieved with reversed q profile with q_min of 2.3, and then HH_98y2 of 1.7, n_e/n_GW of 0.87 and f_BS of 0.9 are also obtained at q₉₅ of 5.3.

37001504
Progress of high power 170 GHz gyrotron in JAEA
Sakamoto, Keishi; Kasugai, Atsushi; Kajiwara, Ken; Takahashi, Koji; Oda, Yasuhisa; Hayashi, Kazuo; Kobayashi, Noriyuki*
Nuclear Fusion 49(9), p.095019_1-095019_6(2009) ; (JAEA-J 06506)

37001505
A Half-millimetre spatial resolution fibre-coded linear position-sensitive scintillator detector with wavelength-shifting fibre read-out for neutron detection
Nakamura, Tatsuya; Schooneveld, E. M.*; Rhodes, N. J.*; Katagiri, Masaki; To, Kentaro; Sakasai, Kaoru; Soyama, Kazuhiko
Nuclear Instruments and Methods in Physics Research A 606(3), p.675-680(2009) ; (JAEA-J 06507)

A fibre-coded linear scintillator detector with a half-millimetre spatial resolution was developed with wavelength-shifting fibre read-out. The head of the detector comprised a ZnS/⁶LiF scintillator placed on the ribbon of WLS fibres. Both ends of the fibres were coded to reduce the number of read-out photomultipliers and associated electronic circuitry. The prototype detector in which the fibre ribbon was sandwiched between two ZnS/⁶LiF scintillators exhibited a spatial resolution of 0.5 mm, a detection efficiency of 35% for 1-Å neutrons, and a γ sensitivity of less than 10^-7. This type of detector would be useful where a submillimetre spatial resolution is required with large detector coverage such as in neutron reflectometers.

37001506
Feasibilyty study on a simplified MOX pellet fabrication process, the short process, for fast breeder reactor fuel
Asakura, Koichi; Takeuchi, Kentaro; Makino, Takayoshi; Kato, Yoshiyuki
Nuclear Technology 167(3), p.348-361(2009) ; (JAEA-J 06508)

Technological feasibility of a simplified MOX pellet fabrication process, the short process, was studied. About 300 g MH-MOX powder with adjusted plutonium content to 30% could be successfully processed by a tumbling-granulator for subsequent pelletizing and sintering processes. The granulated 30%PuO₂-MOX powder could be pressed into green annular pellets directly and smoothly when using a die wall lubrication method. The pellet tensile strengths were compared for a granulated molybdenum powder and they were higher for pellets obtained when using the die wall lubrication method than when using the conventional powder mixing method. The amount of additives in the green pellets could be controlled at 0.06wt% in this process. It is therefore, possible to carry out de-waxing and sintering of green pellets in the same furnace. By controlling the average particle sizes of granulated 30%PuO₂-MOX powders, pellets with more than 95% theoretical density could be obtained after 1700 °C for 2 h. As a result, it can be concluded that the short process is technoligically feasible to fabricate MOX annular pellets.

37001507
The Recent improvement and verification of DARWIN; Development of a new DAQ system and results of flight experiment
Sato, Tatsuhiko; Satoh, Daiki; Endo, Akira; Shigyo, Nobuhiro*; Yasuda, Hiroshi*; Takada, Masashi*; Yajima, Kazuaki*; Nakamura, Takashi
Nuclear Technology 168(1), p.113-117(2009) ; (JAEA-J 06509)

The details of the features of DARWIN will be presented at the meeting, together with the recent improvements of the system such as the implementation of the function for estimating neutron spectra using the unfolding technique.

37001508
Interspecies scaling of self-organ doses from a voxel mouse to voxel humans
Kinase, Sakae; Matsuhashi, Shimpei; Saito, Kimiaki
Nuclear Technology 168(1), p.154-157(2009) ; (JAEA-J 06510)

In the present study, self-AFs for photons and electrons in the spleen, kidneys, and liver of both a mouse and humans were evaluated using Monte Carlo simulations. For the mouse and human models, voxel phantoms based on computed tomography were used. The sources were assumed to be monoenergetic in the energy range 10 keV to 4 MeV and to be uniformly distributed in the spleen, kidneys, and liver. Interspecies scaling factors were determined using the results of the self-AFs for the voxel mouse and voxel human. Consequently, interspecies scaling factors were found to be dependent upon energy emitted in the source organ. It was found that the scaling factor for the photon self-AF, which is corrected by the cube root of the organ mass, shows a similar trend as a function of energy with the scaling factor for the electron self-AF.

37001509
Oxygen-deficient effect on charge ordering in spin- and charge-frustrated ferrite YFe₂O_4-δ
Horibe, Yoichi*; Yoshii, Kenji; Ikeda, Naoshi*; Mori, Shigeo*
Physical Review B 80(9), p.092104_1-092104_4(2009) ; (JAEA-J 06511)

The effects of oxygen deficiency on charge ordering were investigated by transmission electron microscopy at various deficiencies and temperatures of YFe₂O_4-δ. We found that the detailed nature of the charge ordering structures is associated with changes in the superlattice reflections and diffuse scattering. They go from (1/3 1/3 1/2)-type superlattice reflection to (1/3 1/3 l)-type straight-type diffuse scattering, then to zigzag-type diffuse scattering. With the oxygen deficiencies increased, the interchange correlation of Fe-O bilayers obviously decreases, yet the triple super periodicity along [110]^* remains unchanged. These findings on frustrated ferritesindicate the stability of in-plane threefold charge ordering and the importance of the interchange interaction between bilayers in the structural phase transitions.

37001510
Resonant inelastic X-ray scattering in electronically quasi-zero-dimensional CuB₂O₄
Hancock, J. N.*; Chabot-Couture, G.*; Li, Y.*; Petrakovskiĭ, G. A.*; Ishii, Kenji; Jarrige, I.; Mizuki, Junichiro; Devereaux, T. P.*; Greven, M.*
Physical Review B 80(9), p.092509_1-092509_4(2009) ; (JAEA-J 06512)

We present a resonant inelastic scattering (RIXS) study using of CuB₂O₄, which contains a lattice of CuO₄ plaquettes electronically isolated by B⁺³ ions. The observed Cu K-edge spectra show a small number of well-separated features, and the simple electronic structure of CuB₂O₄ allows us to explore RIXS phenomenology. We find a low-energy feature that cannot be attributed to the same charge-transfer excitation discussed in other cuprates and is likely a d → d transition thought to be forbidden under common considerations of K-edge RIXS.

37001511
Identification of a Frenkel-pair defect in electron-irradiated 3C SiC
Son, N. T.*; Janzén, E.*; Isoya, Junichi*; Morishita, Norio; Hanaya, Hiroaki; Takizawa, Haruki; Oshima, Takeshi; Gali, A.*
Physical Review B 80(12), p.125201_1-125201_8(2009) ; (JAEA-J 06513)

Defects in electron irradiated 3C-SiC were studied by electron paramagnetic resonance EPR. The spectrum labeled LE1 was observed in n-type 3C SiC after electron irradiation at low temperatures (∼80-100 K). Supercell calculations of different configurations of silicon vacancy-interstitial Frenkel-pairs, V_Si-Si_i, were carried out. Comparing the data obtained from experiments using EPR and supercell calculations, the LE1 center is assigned to the Frenkel-pair between V_Si and a second neighbor Si_i interstitial along the [100] direction in the 3+ charge state. In addition, a path for the migration of Si_i⁴⁺ was found in 3C SiC. In samples electron-irradiated at low temperatures, the LE1 Frenkel-pair was found to be the dominating defect whereas EPR signals of single vacancies were not detected. The center disappears after warming up the samples to room temperature.

37001512
Observation of an energetic-particle-driven instability in the wall-stabilized high-β plasmas in the JT-60U tokamak
Matsunaga, Go; Aiba, Nobuyuki; Shinohara, Koji; Sakamoto, Yoshiteru; Isayama, Akihiko; Takechi, Manabu; Suzuki, Takahiro; Oyama, Naoyuki; Asakura, Nobuyuki; Kamada, Yutaka; Ozeki, Takahisa; JT-60 Team
Physical Review Letters 103(4), p.045001_1-045001_4(2009) ; (JAEA-J 06514)

We have observed bursting modes driven by trapped energetic particles in the high-β plasmas where the resistive wall mode (RWM) is marginally stable by plasma rotation. This mode can directly trigger the RWM despite enough plasma rotation for RWM stabilization. Mode structure is radially extended and mode frequency corresponds to the precession frequency of the trapped particle from the perpendicular neutral beams. We have concluded that the mode is the energetic particle branch as the results of the interaction between the energetic particle and a marginally stable RWM, and then, it is named as "energetic particle driven wall mode (EWM)".

37001513
A UVB-hypersensitive mutant in Arabidopsis thaliana is defective in the DNA damage response
Sakamoto, Ayako; Lan, V. T. T.*; Puripunyavanich, V.*; Hase, Yoshihiro; Yokota, Yuichiro; Shikazono, Naoya; Nakagawa, Mayu*; Narumi, Issei; Tanaka, Atsushi
Plant Journal 60(3), p.509-517(2009) ; (JAEA-J 06515)

37001514
Divertor impurity-influx monitor for ITER; Spectral throughput measurement on an optical prototype for the upper port and optimization of viewing chords based on computerized tomography
Iwamae, Atsushi; Sugie, Tatsuo; Ogawa, Hiroaki; Kusama, Yoshinori
Plasma and Fusion Research (Internet) 4, p.042_1-042_11(2009) ; (JAEA-J 06516)

We have developed a spectroscopic diagnostics system in ultraviolet and visible wavelength regions for monitoring ITER divertor plasmas. An equivalent-size prototype of the optical components for the upper port-viewing fan array chords has been assembled as a system to measure spectral light throughput coefficient (étendu). Collisional-radiative models for He_I and C_IV are used to estimate the emission line intensities of helium ash and carbon impurity ions in a divertor plasma of a burning plasma. For the measurement of T_i, the estimated line intensity of C_IV n=6-7 meets the time resolution of ITER requirement. A numerical simulation of the computerized tomographic (CT) reconstruction technique has been applied to the divertor plasma region. A Gaussian-type intensity model function with 100 mm (full-width-at-half-maximum) of the impurity emission observed by means of various pairs of fan array-viewing chords is applied based on the CT reconstructs. With the optimized pair of the upper port and the higher gap viewing chords resolve the model function with reasonable resolution. We measure the reflection of the surfaces of carbon-fiber-composite and tungsten blocks, which consist of the plasma-facing divertor target plate and the dome. The reflection of the surface of the tungsten divertor material at Hα 656.28 nm is 23%, sandblasting the tungsten surface reduces direct reflectance less than 0.7%.

37001515
Free radical scavenging and radioprotective effects of carnosine and anserine
Fu, H.*; Katsumura, Yosuke; Lin, M.; Muroya, Yusa*; Hata, Kuniki; Fujii, Kentaro; Yokoya, Akinari; Hatano, Yoshihiko
Radiation Physics and Chemistry 12(78), p.1192-1197(2009) ; (JAEA-J 06518)

Two histidine-containing natural dipeptides, carnosine and anserine (β-alanyl-1-methyl- L-histidine), have been examined for their antioxidant and radioprotective abilities. Pulse radiolysis studies indicated the antioxidative properties of carnosine and anserine aqueous solutions at different pHs. The rate constants for the reaction OH radical with carnosine at neutral pH were determined to 5.3×10⁹ M^-1s^-1 at 300 nm, and 4.1×10⁹ M^-1s^-1 at 400 nm, respectively. Carnosine and anserine also protected plasmid pUC18 DNA from X-ray radiation induced strand breaks as evidenced from the studies by agarose gel electrophoresis. Carnosine showed higher protective efficiency under the experimental conditions. Our data demonstrated that carnosine and anserine may play an important role in the maintenance of the antioxidant system.

37001516
Enhancement of plant growth stimulation activity of irradiated alginate by fractionation
Luan, L. Q.*; Nagasawa, Naotsugu; Ha, V. T. T.*; Hien, N. Q.*; Nakanishi, Tomoko*
Radiation Physics and Chemistry 78(9), p.796-799(2009) ; (JAEA-J 06519)

Alginate with the weight-average molecular weight (M_w) approximately 900 kDa and ratio of M (mannuronate)/G (guluronate) about 1.3 was irradiated by γ Co-60 in aqueous solution at doses up to 200 kGy. The irradiation dose was shown to be a function for reducing M_w and molecular weight distribution of irradiated alginates. The distribution of oligomer fractions in irradiated products was also investigated by separation using ultrafiltration membranes. The irradiated alginate with M_w approximately 14.2 kDa was found to have a positive influence for growing of barley and soybean. The irradiated oligoalginate fraction with M_w ranging from 1 to 3 kDa displayed the strongest effect on the growth and development of the mentioned plants at low concentration (20 ppm). It is suggested that oligoalginate with M_w in the range 1-3 kDa is a trigger for the growth and development of plants.

37001517
Future perspectives of radiation chemistry
Hatano, Yoshihiko
Radiation Physics and Chemistry 78(12), p.1021-1025(2009) ; (JAEA-J 06520)

Future perspectives of radiation chemistry are discussed by the analysis of the related information in detail as obtained from our recent surveys of publications and scientific meetings in radiation chemistry and its neighboring research fields, giving some examples, and are summarized as follows. (1) Traditionally important core-parts of radiation chemistry should be activated more. The corresponding research programs are listed in detail. (2) Research fields of physics, chemistry, biology, medicine, and technology in radiation research should interact more among them with each other. (3) Basic research of radiation chemistry should interact more with its applied research. (4) Interface research fields with radiation chemistry should be produced more with mutually common viewpoints and research interests between the two. Interfaces are not only applied research but also basic one.

37001518
Preparation of PTFE-based fuel cell membranes by combining latent track formation technology with graft polymerization
Yoshida, Masaru*; Kimura, Yosuke*; Chen, J.; Asano, Masaharu; Maekawa, Yasunari
Radiation Physics and Chemistry 78(12), p.1060-1066(2009) ; (JAEA-J 06521)

The swift heavy ions of 56 MeV ¹⁵N³⁺were irradiated with particle fluences of 3 × 10⁷ ions/cm² to form the latent track zone for a 25 μm-thick film of polytetrafluoroethylene (iPTFE). The styrene (St) was grafted onto the iPTFE films by UV-irradiation and pre-γ-irradiation and the resulting iPTFE-based proton conducting membranes were obtained after sulfonation, namely, iPTFE-g(UV)-PStSA and iPTFE-g(γ)-PStSA membranes, which have a straight cylindrical damage zone around the ion path. The degree of grafting was obtained to be about 7.5% in both the UV-method and the γ-method. The ion exchange capacity, proton conductivity in thickness direction, MeOH permeability, tensile strength and elongation at break of the obtained iPTFE-g(UV)-PStSA membrane were 0.50 mmol/g, 0.06 S/cm, 0.15 × 10^-6 cm²/s, 50 MPa and 600%, in contrast to 0.06 mmol/g, 0.06 S/cm, 0.35 × 10^-6 cm²/s, 19 MPa and 210% for the iPTFE-g(γ)-PStSA membrane, respectively. For comparison, the Nafion 112 measured in our laboratory showed an ion exchange capacity of 0.91 mmol/g, a proton conductivity of 0.06 S/cm, a MeOH permeability of 1.02 × 10^-6 cm²/s, a tensile strength of 35 MPa and an elongation at break of 295%. It could conclude from these data that the lower crossover of MeOH, proton conductibility of the Nafion corresponding even in lower ion exchange capacity and higher mechanical properties of the UV-grafted proton-conducting membranes make them promising materials for widespread application in direct methanol fuel cell.

37001519
The Role of a radial ion-track distribution in semiconductors studied by numerical simulations
Onoda, Shinobu; Hirao, Toshio; Oshima, Takeshi; Ito, Hisayoshi
Radiation Physics and Chemistry 78(12), p.1116-1119(2009) ; (JAEA-J 06522)

The effects of radial ion track distribution on the unexpected noise (transient current) in semiconductors by a high energy heavy ion strike have been studied. The measured transient currents were compared with the numerically observed one, which was calculated with the wide variety of ion track radii. In the case of low energy (several MeVs) ion, the calculated transient currents were independent of the radial track distribution. However, in the case of high energy (several hundreds of MeVs) ion, the transient currents strongly depend on the radial track distribution. This difference is interpreted in terms of the carrier concentration at the core of track, resulting in the extremely different carrier mobility. When the radius of ion track used in numerical simulator was shorter than, or equivalent to, the penumbra radius, the reasonable agreement was found between experimental and calculated transient currents.

37001520
Radiation-induced chemical evolution of biomolecules
Nakagawa, Kazumichi*; Matsui, Takahiro*; Izumi, Yudai*; Agui, Akane; Tanaka, Masahito*; Muro, Takayuki*
Radiation Physics and Chemistry 78(12), p.1198-1201(2009) ; (JAEA-J 06523)

Chemical-evolution in glycilglycine (Gly2) films irradiated by 146 nm light was studied. It was found that quantum efficiency of chemical evolution from Gly2 to glycilglycilglycine (Gly3) is smaller than that to glycilglycilglycilglycine (Gly4) due to the multiple step of reaction. From natural circular dichroism spectra measurements for serine and alanine films, we found the splitting of 1s→π^* transitions in the energy region of oxygen 1s.

37001521
Biodegradable metal adsorbent synthesized by graft polymerization onto nonwoven cotton fabric
Sekine, Ayako*; Seko, Noriaki; Tamada, Masao; Suzuki, Yoshio*
Radiation Physics and Chemistry 79(1), p.16-21(2010) ; (JAEA-J 06524)

A fibrous adsorbent for Hg ions was synthesized by radiation-induced emulsion graft polymerization of glycidyl methacrylate (GMA) onto a nonwoven cotton fabric and subsequent chemical modification. The optimal pre-irradiation dose for initiation of the graft polymerization of GMA, which minimized the effects of radiation damage on the mechanical strength of the nonwoven cotton fabric, was found to be 10 kGy. The GMA-grafted nonwoven cotton fabric was subsequently modified with ethylenediamine (EDA) or diethylenetriamine (DETA) to obtain a Hg adsorbent. The resulting amine-type adsorbents were evaluated for batch and continuous adsorption of Hg. In batch adsorption, the distribution coefficients of Hg reached 1.9×10⁵ and 1.0×10⁵ for EDA- and DETA-type adsorbents, respectively. A column packed with EDA-type adsorbent removed Hg from 1.8 ppm Hg solution at a space velocity of 100 h^-1, which corresponds to 16,000 times the volume of the packed adsorbent.

37001522
Emulsion grafting of glycidyl methacrylate onto polyethylene fiber
Seko, Noriaki; Nguyen, T. Y. N.*; Tamada, Masao
Radiation Physics and Chemistry 79(1), p.22-26(2010) ; (JAEA-J 06525)

Graft polymerization of glycidyl methacrylate (GMA) onto polyethylene fiber was carried out in emulsion solution obtained by dissolving GMA in water with sodium n-dodecyl sulfate (SDS) as a surfactant. GMA micelles diameter was 415 nm at 5% GMA with 4% SDS and increased up to 1840 nm at 10% GMA with 12% SDS. Degree of grafting (Dg) which was estimated by the weight gain after grafting increased with the increment of GMA concentration in the range of 2-8% and slightly reduced at 10% GMA. The increment in SDS concentration from 4% to 16% at 5% GMA reduced Dg from 120% to 18%. In emulsion graft polymerization, Dg was affected by covered area by GMA/SDS micelles on the fiber.

37001523
Radiation deterioration of ion-exchange Nafion N117CS membranes
Iwai, Yasunori; Hiroki, Akihiro; Tamada, Masao; Isobe, Kanetsugu; Yamanishi, Toshihiko
Radiation Physics and Chemistry 79(1), p.46-51(2010) ; (JAEA-J 06526)

The cation-exchange Nafion N117CS membranes swelling in electrolyte solution were irradiated with γ-rays or electron beams at various doses up to 1500 kGy in the temperature range from room temperature to 343 K to obtain detailed information on the effect of ion-exchange on the radiation deterioration in mechanical properties and ion exchange capacity. Considerable deterioration in mechanical properties was observed when the Nafion membranes swelling in electrolyte solution were irradiated. A reason is the promotion of degradation with oxygen molecules produced by the irradiation of electrolyte solution. The concentration of electrolyte solution influenced strongly the radiation deterioration in mechanical properties. Keeping the concentration of metal ions to be negligible is important when electrolyzed highly radioactive solution in the light of the durability of polyperfluorosulfonic acid membrane. A sort of cation in electrolyte solution negligibly influenced radiation deterioration in mechanical properties. A sort of anion in electrolyte solution had negligible effect on radiation deterioration in mechanical properties and ion exchange capacity.

37001524
Transmission of cluster ions through a tandem accelerator of several stripper gases
Saito, Yuichi; Chiba, Atsuya; Narumi, Kazumasa
Review of Scientific Instruments 80(10), p.106104_1-106104_3(2009) ; (JAEA-J 06527)

The transmissions of carbon cluster ion beams through a tandem accelerator using different kinds of stripper gases (He, N₂, CO₂, SF₆) with a terminal voltage of 2.5 MV were measured as a function of the gas pressure in order to select the most suitable gas for cluster ion acceleration. The results showed that the transmission increased with decreasing the mass of gas atom/molecule, that is to say, helium showed better performance than those of other gases used. In addition, the ratio of transmissions C_n, in case of using helium and nitrogen gases, increased with the size of cluster, n. Therefore, helium gas seemed to be suitable stripper gas for larger size of cluster ions in acceleration with the identical energy.

37001525
Laser tunnel ionization from multiple orbitals in HCl
Akagi, Hiroshi; Otobe, Tomohito; Staudte, A.*; Shiner, A.*; Turner, F.*; Dörner, R.*; Villeneuve, D. M.*; Corkum, P. B.*
Science 325(5946), p.1364-1367(2009) ; (JAEA-J 06528)

Tunneling, one of the most striking manifestations of quantum mechanics, influences the electronic structure of many molecules and solids and is responsible for radioactive decay. Much of the interaction of intense light pulses with matter commences with electrons tunneling from atoms or molecules to the continuum. Until recently, this starting point was assumed to be the highest occupied orbital of a given system. Here, we report the observation of tunneling from a lower lying state in HCl. Analyzing two independent experimental observables allows us to isolate (via fragment ions), identify (via molecular frame photoelectron angular distributions) and, with the help of ab-initio simulations, quantify the contribution of lower lying orbitals to the total and angle dependent tunneling current of the molecule.

37001526
Si-doping for the protection of hydrogenated diamond-like carbon films in a simulated atomic oxygen environment in low earth orbit
Yokota, Kumiko*; Tagawa, Masahito*; Kitamura, Akira*; Matsumoto, Koji*; Yoshigoe, Akitaka; Teraoka, Yuden; Fontaine, J.*; Belin, M.*
Transactions of JSASS, Aerospace Technology Japan (Internet) 7(ists26), p.Pc_37-Pc_42(2009) ; (JAEA-J 06530)

The effect of hyperthermal atomic oxygen (AO) exposure on a surface property of Si-doped DLC was investigated. Two types of DLC were tested which contain Si atoms approximately 10 at% and 20 at%. Surface analytical results of high-resolution X-ray photoelectron spectroscopy using synchrotron radiation (synchrotron radiation photoemission spectroscopy; SR-PES) as well as Rutherford backscattering spectroscopy (RBS) have been used for characterization of the AO-exposed Si-doped DLC. It was identified by SR-PES that the SiO₂ layer was formed by the hyperthermal AO exposure at the Si-doped DLC surface. RBS data indicates that AO exposure leads to severe thickness loss on the non-dope DLC, in contrast, SiO₂ layer formed by the hyperthermal atomic oxygen reaction at the Si-doped DLC protects the DLC underneath the SiO₂ layer.

37001527
Effect of KM molar mass on CMC-KM-Acid gel
Kasahara, Takamitsu*; Takigami, Machiko*; Nagasawa, Naotsugu; Takigami, Shoji*
Transactions of the Materials Research Society of Japan 34(3), p.395-398(2009) ; (JAEA-J 06531)

37001528
Recent research on biomolecules extraction (in Japanese)
Shimojo, Kojiro
Bunri Gijutsu 39(4), p.236-239(2009) ; (JAEA-J 06532)

37001529
Rapid determination of trace uranium in liquid wastes from spent nuclear-fuel reprocessing plants using on-line solid-phase extraction / electrochemical detection (in Japanese)
Taguchi, Shigeo; Surugaya, Naoki; Kurosawa, Akira; Hiyama, Toshiaki; Tanaka, Tatsuhiko*
Bunseki Kagaku 58(10), p.901-907(2009) ; (JAEA-J 06533)

An on-line analysis system using a solid-phase extraction column coupled to electrochemical detection has been developed for rapid determination of small amounts of uranium in liquid wastes of spent nuclear-fuel reprocessing plants. A sample solution with a concentration of 3 M HNO₃ was loaded onto the column: packed with U/TEVA^® resin. The interference elements were rinsed by passing 3 M HNO₃ through the column. The adsorbed uranium was eluted with 0.1 M HNO₃. The eluate was directly introduced into a flow-electrolysis cell. The result of five repeated analyses for a standard solution containing 2.5 μg (0.1 mL at 25 μg mL^-1) of uranium was found to be 2.5 ± 0.025 μg (mean ± 1 σ). The detection limit calculated from 3 times the standard deviation of background current was 56 ng. The analysis time required for one sample was within 5 min. The recoveries of uranium in actual nuclear waste reprocessing solutions were 92% ∼ 112%.

37001530
A Notice for the measuring of physicochemical parameters (pH, ORP) of deep groundwater (in Japanese)
Iwatsuki, Teruki; Morikawa, Keita*; Hosoya, Shinichi*; Yoshikawa, Hideki
Chikasui Gakkai-Shi 51(3), p.205-214(2009) ; (JAEA-J 06534)

Physicochemical parameters of deep groundwater at the depth of 500 m were measured at ground surface and the in-situ sampling depth of borehole to understand the redox condition and dominant redox process. The results show that the redox potential at the depth was approximately -100 mV and was controlled by the reaction of chemical pairs of (Fe₂⁺, SO₄^2-)/(FeS₂) or (SO₄^2-, FeCO₃)/(FeS). The pH value at ground surface changed approximately 0.4 from that at the in-situ depth by degassing of dissolved carbon dioxide. The time to reach the stable ORP value in monitoring depends on the shape and surface area of Pt electrode. The columnar-shape Pt electrode is more sensitive for deep groundwater rather than a dot-shape Pt electrode. It is important to correct the pH measured at ground surface for the analysis of in-situ redox reaction process.

37001531
Ripple loss of alpha particles in a low-aspect ratio tokamak reactor (in Japanese)
Tani, Keiji*; Nishio, Satoshi; Tobita, Kenji; Tsutsui, Hiroaki*; Mimata, Hideyuki*; Iio, Shunji*; Aoki, Takayuki*
Denki Gakkai Rombunshi, A 129(9), p.569-574(2009) ; (JAEA-J 06535)

Studies on the loss of fusion produced alpha particles enhanced by toroidal field (TF) ripple in a low-aspect-ratio tokamak reactor (VECTOR) have been made by using an orbit-following Monte-Carlo code. In actual TF coil systems, the ripple loss of alpha particles is strongly reduced as the aspect ratio becomes low (the power loss is proportional to A^8.8 for A more than 2.5) and the reduction of the number of TF coils results in a large amount of ripple losses even in a low-aspect-ratio tokamak.

37001532
Phosphate conversion behaviors of FP chlorides with spent electrolyte recycling
Kofuji, Hirohide; Amamoto, Ippei; Sasaki, Kazuya*; Yasumoto, Masaru*; Takasaki, Yasushi*; Myochin, Munetaka; Terai, Takayuki*
Denki Kagaku Oyobi Kogyo Butsuri Kagaku 77(8), p.597-600(2009) ; (JAEA-J 06536)

The process flow of the phosphate conversion technique has been developed for the reduction of high-level radioactive waste (HLW) generated from the metal-electrorefining process. In this study, the results of thermodynamic calculations for the phosphate conversion reactions were examined by the basic experiments. The chlorides of rare earth elements (REE) turned out to be converted into phosphates easily. Furthermore, as the additive for the phosphate conversion reaction, high temperature behavior of lithium phosphate was evaluated to elucidate the thermodynamic property.

37001533
Redox equilibria of the U⁴⁺/U³⁺ and U³⁺/U couples in molten LiCl-RbCl eutectic
Nagai, Takayuki; Uehara, Akihiro*; Fujii, Toshiyuki*; Shirai, Osamu*; Sato, Nobuaki*; Yamana, Hajimu*
Denki Kagaku Oyobi Kogyo Butsuri Kagaku 77(8), p.614-616(2009) ; (JAEA-J 06537)

Formal redox potentials of the U⁴⁺/U³⁺ and U³⁺/U couples in molten LiCl-RbCl eutectic were determined by cyclic voltammetry. These redox potentials were more negative than those in the LiCl-KCl eutectic but positive comparing to those in the NaCl-CsCl eutectic. This relation would be correlated with the averaged alkali cation radius.

37001534
A Private remark for the design basis and safety assessment of geological disposal (in Japanese)
Maeda, Toshikatsu
Genankyo Dayori (232), p.3-6(2009) ; (JAEA-J 06538)

37001535
Current state of research and development of radioisotopes in Japan (in Japanese)
Ishioka, Noriko
Genshiryoku eye 55(7), p.20-23(2009) ; (JAEA-J 06539)

37001536
Exploring the radioresistance of living organisms (in Japanese)
Narumi, Issei
Hoshasen To Sangyo (123), p.28-33(2009) ; (JAEA-J 06543)

37001537
On quantitative estimation of laser melting phenomenon with numerical visualization technique (in Japanese)
Takase, Kazuyuki; Shobu, Takahisa; Tsukimori, Kazuyuki; Muramatsu, Toshiharu
Kashika Joho 29(Suppl.2), p.113-114(2009) ; (JAEA-J 06544)

37001538
Immobilization of functional materials onto poly(styrene-co-divinylbenzene) gels by γ irradiation and adsorption properties (in Japanese)
Mishima, Satoko*; Asano, Masaharu; Yoshida, Masaru
Kobunshi Rombunshu 66(7), p.250-258(2009) ; (JAEA-J 06546)

Pectin and triallylisocyanurate (TAIC) were immobilized onto poly(styrene-co-divinylbenzene) (PSD) beads by irradiating in the range of 2.5 to 25 kGy using γ-rays from a ⁶⁰Co source. The adsorption performance of methyl-2-benzimidazolylcarbamate (MBC) treated with immobilized Pectin- TAIC beads was investigated. Pectin was effective to enhance the MBC uptakes at pH11, in contrast to pH3 for TAIC. The amounts of MBC uptake of immobilized Pectin-TAIC beads were 1.3∼3.9 times higher than those of PSD beads which were only irradiated without the use of Pectin and TAIC in the range of pH3 to pH11. The cycles of absorption-desorption assays show that the sorption performance of immobilized Pectin-TAIC beads shows excellent reproducibility, suggesting that the immobilized Pectin-TAIC beads are a useful adsorbent for the extraction of MBC from environmental water.

37001539
High pressure and high temperature EXAFS and diffraction study of AgI (MS35) (in Japanese)
Yoshiasa, Akira*; Arima, Hiroshi; Fukui, Hiroshi*; Okube, Maki*; Katayama, Yoshinori; Otaka, Osamu*
Nippon Kessho Gakkai-Shi 51(1), p.66-69(2009) ; (JAEA-J 06549)

We have determined a precise P-T phase diagram of AgI by high-temperature high-pressure synchrotron experiments. X-ray diffraction and X-ray absorption measurements were performed using a multi-anvil high pressure apparatus at SPring-8 synchrotron radiation facility. In a disordered rock-salt phase, Ag ions occupy both octahedral and tetrahedral sites. The occupancy of tetrahedral site has a maximum value, 20%, at 2 GPa. A change from rock-salt structure to disordered rock-salt structure is gradual in the X-ray diffraction measurements while it is clearly observed in the X-ray absorption measurements. Analysis of EXAFS Debye-Waller factor is useful because the force constant can be decided directly even at high pressure and high temperature. Pressure influences greatly the effective potential and anharmonicity decreases with increasing pressure.

37001540
Production of femtosecond UV pulse and efficient X-ray generation by femtosecond UV laser-nanocluster interaction (in Japanese)
Mori, Michiaki; Kiriyama, Hiromitsu; Yoshimura, Masashi*; Mori, Yusuke*; Okada, Hajime; Shigemori, Keisuke*
Purazuma, Kaku Yugo Gakkai-Shi 85(6), p.389-392(2009) ; (JAEA-J 06550)

37001541
The Foundation of thermal and fluid engineering in nuclear fusion reactors, 2-2; Heat transfer fluids in fusion blankets (in Japanese)
Seki, Yohji; Ezato, Koichiro; Enoeda, Mikio
Purazuma, Kaku Yugo Gakkai-Shi 85(8), p.543-547(2009) ; (JAEA-J 06551)

The role of the blanket that surrounds the core plasma is divided broadly into the tritium breeding, the radiation shielding, and the thermal energy recovery required to generate electricity. A large number of phenomena of thermal and fluid engineering exist in blanket. These understanding has enhanced the development of the blanket design and technology. In coolant types in blankets, the high temperature high-pressure water, helium, molten salt Flibe, liquid lithium and liquid LiPb have been currently proposed. Helium is also applied as tritium purge gas in tritium recovery system. The fundamental phenomena of heat transfer and the thermal fluid engineering in blankets are reported in this paper.

37001542
Stability of radioactive minerals in an oxidizing hydrogeological environment; New results from an alluvial placer deposit, Naegi District, Central Japan. (in Japanese)
Sasao, Eiji; Komuro, Kosei*; Nakata, Masataka*
Shigen Chishitsu 59(3), p.209-217(2009) ; (JAEA-J 06553)

Study of the stability and alteration of radioactive minerals in a placer deposit in the Naegi District, southeastern Gifu Prefecture, Central Japan contributes to understanding the modes of nuclide migration under various hydrogeological environments in the tectonically active Japanese Island Arc system. Under the optical and scanning microscopes, many grains of zircon have well-preserved crystal faces, whereas those of thorite were highly abraded and corroded. Most of monazite and fergusonite have partly abraded and corroded forms. This result indicates that uranium is strongly leached under oxidized hydrogeological environment but the behaviour is different for different minerals, being well harmony with the thermodynamic estimation. Leaching or release of uranium from radioactive minerals to surface geological environment is estimated to extend over long time under oxidized hydrogeological environment.

37001543
A Large scale network visualization for important nodes discovery (in Japanese)
Miyamura, Hiroko; Ozahata, Satoshi*; Nakao, Akihiro*; Kawashima, Konosuke*; Suzuki, Yoshio
Shingaku Giho 109(188), p.85-90(2009) ; (JAEA-J 06554)

We propose a network visualization method for a large-scale file-sharing network dataset. The network dataset has nodes and links that represent the connection between two nodes. When the number of links is large, it is difficult to recognize the structure of the network data, because many links are crossed. In this context, for recognizing the structure and exploring the key nodes, we propose a link-less network visualization method using matrix based representation. In addition, we demonstrate the effectiveness of the proposed method by applying it to the file-sharing network log data.

37001544
The Relaxation phenomena of radicals induced in irradiated fresh mangoes (in Japanese)
Kikuchi, Masahiro; Ogawa, Hideyuki*; Morishita, Norio; Ukai, Mitsuko*; Kobayashi, Yasuhiko; Shimoyama, Yuhei*
Shokuhin Shosha 44(1-2), p.9-13(2009) ; (JAEA-J 06555)

37001545
Internal stress in EB-PVD thermal barrier coatings under thermal cycle (in Japanese)
Suzuki, Kenji*; Shobu, Takahisa
Zairyo 58(7), p.562-567(2009) ; (JAEA-J 06556)

As the top coating, zirconia with 4 mol% yittria was electron beam-physical vapor deposited (EB-PVD) on the bond coating of CoNiCrAlY. The substrates were rotated during EB-PVD process and the rotation speeds were 5 (R5) and 10 rpm (R10). In order to investigate the change of the internal stress in the top coating by a thermal cycle, the specimen was heated from a room temperature to 1273 K, the internal stress was measured in-situ by the strain scanning method with hard synchrotron X-rays at each temperature step. For the specimen R5, the internal stress increased from about -100 MPa to about 100 MPa with the increase in temperature, then the stress relaxation of the top coating occurred over 1073 K. For the specimen R10, the internal stress did not show a tension in the heating process, it was caused by the separation between columnar structure.

37001546
Observation of internal crack of steel bar by computed tomography and strain mapping near its tip using synchrotron white X-ray (in Japanese)
Shibano, Junichi*; Kiriyama, Koji; Kajiwara, Kentaro*; Shobu, Takahisa; Suzuki, Kenji*; Arai, Takayuki*; Miura, Setsuo*; Kobayashi, Michiaki*
Zairyo 58(7), p.596-602(2009) ; (JAEA-J 06557)

A computerized tomography and a strain mapping near a crack tip in material were investigated using a white X-ray obtained from BL28B2 beam line at SPring-8 in Japan. The computerized tomography of the crack in the specimen was carried out by using the CCD camera that can detect indirectly the X-ray transmitted through the specimen. To measure the strain using the energy dispersive X-ray diffraction technique. As the results, the computerized tomography of the crack in the specimen under the tensile loading was practicable by using the white X-ray. The map of the internal strain near the crack tip of the specimen could be obtained using the high energy white X-ray. It was confirmed that the maximum tensile strain was distributed circularly along the crack tip estimated by CT.

37001547
Conceptual study for the hollow core of a research reactor
Komeda, Masao; Arai, Masaji; Sagawa, Hisashi; Kusunoki, Tsuyoshi
Proceedings of 12th International Group on Research Reactors (12th IGORR) (USB Flash Drive) , 9p.(2009) ; (JAEA-J 06559)

We carried out conceptual study of a future research reactor focused on a hollow core. The hollow core satisfied both utilizations of neutron beam and irradiation. It was indicated that the hollow core with 40.8cm-by-40.8cm had higher neutron flux in the D₂O tank by 30% than a square core with 40.8cm-by-40.8cm. The hollow core could achieve almost same flux as a smaller square core with 35.7cm-by-35.7cm. Because there was the peak flux at the furthest point from the core in the D₂O tank in the case of the hollow core, it was able to obtain more neutrons for neutron irradiation utilization. The hollow core had flat and large (20.4cm-by-20.4cm) irradiation area of fast neutron in the central area. There the fast neutron flux was 7.0×10¹⁴ (n/cm²/s). There is not a reactor that has such a large irradiation field of fast neutron. Therefore the hollow core is regarded as an attractive research reactor for irradiation field of fast neutron.

37001548
Refurbishment status and future program of Japan Materials Testing Reactor (JMTR)
Ishihara, Masahiro; Kawamura, Hiroshi; Niimi, Motoji; Kaminaga, Masanori; Hori, Naohiko; Nagao, Yoshiharu
Proceedings of 12th International Group on Research Reactors (12th IGORR) (USB Flash Drive) , 10p.(2009) ; (JAEA-J 06560)

The JMTR is a light water cooling tank typed reactor with first criticality in March 1968. The JMTR has been applied to fuel/material irradiation tests for LWRs, HTGR, fusion reactor and RI production. However, the JMTR operation was once stopped at August 2006, and the refurbishment works are now conducting. The reactor facilities will be renewed taking four years from the beginning of FY 2007, and necessary examination and works are carrying out on schedule. The renewed JMTR will be started from FY 2011, and be operated for a period of about 20 years until around FY 2030. The usability improvement of the JMTR, e.g. higher reactor availability-factor, shortening turnaround time to get irradiation results, attractive irradiation cost, business confidence, is also discussing with users as the preparations for re-operation. In the paper, status of the refurbishment of reactor facilities are introduced, moreover the future program using the JMTR will be prescribed.

37001549
Investigation of optimization on in-core fuel management with high reactor-availability-factor of JMTR
Takemoto, Noriyuki; Naka, Michihiro; Nagao, Yoshiharu
Proceedings of 12th International Group on Research Reactors (12th IGORR) (USB Flash Drive) , 11p.(2009) ; (JAEA-J 06561)

37001550
Steam-water pressure drop under high pressure condition
Liu, W.; Tamai, Hidesada; Yoshida, Hiroyuki; Takase, Kazuyuki; Hayafune, Hiroki; Futagami, Satoshi; Kisohara, Naoyuki
Proceedings of 13th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-13) (CD-ROM) , 10p.(2009) ; (JAEA-J 06562)

For the Steam Generator (SG) in a commercialized sodium cooled faster breeder reactor, flow instability in water side is one of the most important items need researching. As the first step of the research, thermal hydraulics experiments using water as test fluid were performed under high pressure condition at JAEA with using a circular tube. Pressure drop, heat transfer coefficients and void fraction data were derived. This paper focuses on the discussion to steam - water pressure drop. We evaluated existing correlations for two-phase flow multiplier under high pressure. As a result, Chismholm correlation was confirmed being the best one for the present high pressure data.

37001551
Numerical prediction of pressure loss in tight-lattice rod bundle by use of 3-dimensional two-fluid model simulation code ACE-3D
Yoshida, Hiroyuki; Suzuki, Takayuki*; Takase, Kazuyuki
Proceedings of 13th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-13) (CD-ROM) , 11p.(2009) ; (JAEA-J 06563)

In this paper, boiling two-phase flow analysis in a tight-lattice rod bundle was performed by the ACE-3D. In the results, the void fraction in an outermost region of the rod bundle is lower than that in a center region of the rod bundle. The tendency of void fraction distributions agreed with the measurement results by neutron radiography qualitatively. Moreover the pressure distribution in a horizontal plane induced by the void fraction distribution was the cause of bubble movement from the gap region to the subchannel region. The predicted pressure loss in the axial section without spacers accorded with experimental results with a difference of around 10%. The predicted friction pressure loss was underestimated around 20% of measured values, and the effect of the turbulence model is considered as one of the causes of this underestimation.

37001552
Numerical investigation of thermal striping near core instruments plate around control rod channels in JSFR
Tanaka, Masaaki; Ohshima, Hiroyuki; Murakami, Satoshi*
Proceedings of 13th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-13) (CD-ROM) , 12p.(2009) ; (JAEA-J 06564)

This paper deals with numerical simulations focusing on several areas around typical CR channels in order to reveal thermal mixing phenomena and to confirm effect of mitigation measures to the thermal striping phenomena around the CR channel. By the numerical simulation, generation mechanism of influential temperature fluctuation on the CIP integrity is revealed and effect of mitigation measure based on the mixing mechanism is confirmed.

37001553
Study on velocity field in a wire wrapped fuel pin bundle of sodium cooled reactor; Detailed velocity distribution in a subchannel
Sato, Hiroyuki; Kobayashi, Jun; Miyakoshi, Hiroyuki; Kamide, Hideki
Proceedings of 13th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-13) (CD-ROM) , 13p.(2009) ; (JAEA-J 06565)

A sodium cooled fast reactor is designed to attain a high burn-up core in a feasibility study on commercialized fast reactor cycle systems. It is of importance to obtain the flow velocity distribution in a wire wrapped pin bundle for the high burn-up core. A 2.5 times enlarged 7-pin bundle water model was applied to investigate the detailed velocity distribution in an inner subchannel surrounded by 3 pins with wrapping wire. The velocity distribution in an inner subchannel with the wrapping wire was measured by Particle Image Velocimetry. In the vertical velocity distribution in a narrow space between the pins, the wrapping wire decreased the velocity downstream of the wire and asymmetrical flow distribution was formed between the pin and wire. In the horizontal velocity distribution, swirl flow around the wrapping wire was obviously observed.

37001554
Measurement of surface heat flux and surface temperature in nucleate pool boiling using micro-thermocouples
Liu, W.; Takase, Kazuyuki
Proceedings of 17th International Conference on Nuclear Engineering (ICONE-17) (CD-ROM) , 6p.(2009) ; (JAEA-J 06566)

A measurement system for surface temperature and surface heat flux was developed to study heat transfer mechanism in boiling process. The system was consisted by two parts: (1) inner block temperatures were measured using micro-thermocouples set at two layers inside heating block; (2) with using the measured temperatures, inverse heat transfer analysis was performed to get surface heat flux and surface temperature. For the inner block temperature measurement, special T-type micro thermocouples with a common positive pole were developed. The developed system was used to research the change of surface heat flux and surface temperature in a boiling process. The experiments showed the developed special T-type micro thermocouples could trace temperature change in boiling process successfully. Increase in surface heat flux with the generation of big bubble was derived successfully.

37001555
Two-phase cross flow between subchannels in a tight-lattice rod bundle
Zhang, W.*; Yoshida, Hiroyuki; Takase, Kazuyuki
Proceedings of 17th International Conference on Nuclear Engineering (ICONE-17) (CD-ROM) , 8p.(2009) ; (JAEA-J 06567)

37001556
Network computing infrastructure to share tools and data in GNEP
Kim, G.; Suzuki, Yoshio; Teshima, Naoya
Proceedings of 17th International Conference on Nuclear Engineering (ICONE-17) (CD-ROM) , 8p.(2009) ; (JAEA-J 06568)

Network computing infrastructure for sharing tools and data was implemented to support international collaboration. In designing the system, we focused on three issues: accessibility, security, and usability. For the first issue, SSL-VPN technology was adopted to access computing resources beyond firewalls. For the second issue, PKI-based authentication mechanism was used for access control. Shared key based file encryption was also used to protect against information leakage. The introduction of the authentication gateway enables to strengthen the security. To provide high usability, WebDAV was used to provide users with a function to manipulate distributed files through a windows-like GUI. These functions were integrated into a Grid infrastructure AEGIS. Web applications were developed on the infrastructure for dynamic community creation and information sharing. In this paper, we discuss design issues of the system and report the implementation of a prototype applied to share information for the international project GNEP.

37001557
A Script generator API for the full-scale three-dimensional vibration simulation of an entire nuclear power plant within AEGIS
Kim, G.; Suzuki, Yoshio; Teshima, Naoya; Nishida, Akemi; Yamada, Tomonori; Araya, Fumimasa; Takemiya, Hiroshi; Nakajima, Norihiro; Kondo, Makoto
Proceedings of 1st International Conference on Parallel, Distributed and Grid Computing for Engineering (PARENG 2009) (CD-ROM) , 12p.(2009) ; (JAEA-J 06569)

We developed the Script Generator API to support users to develop Grid-enabled client application. The Script Generator API automatically generates a Grid-enabled workflow script needed to execute jobs on a Grid system. Using the Script Generator API enables users to use a Grid environment without consciousness of a Grid computing system. In this paper, we show the implementation of the Script Generator API in our Grid infrastructure and its utilization to the Full-scale 3D Vibration Simulator for an Entire Nuclear Power Plant. By developing a Grid-enabled client application for the Full-scale 3D Vibration Simulator, we confirmed the usability of the Script Generator API.

37001558
Development of an eddy current testing technique for inspecting inner corrosion of cladding
Miyaji, Noriko; Katsuyama, Kozo; Nagamine, Tsuyoshi
Proceedings of 46th Annual Meeting of "Hot Laboratories and Remote Handling" Working Group (HOTLAB 2009) (CD-ROM) , 5p.(2009) ; (JAEA-J 06570)

An eddy current testing (ECT) technique was developed to check the soundness of irradiated fuel pins non-destructively. Here, the technique was applied to detect the decrease in wall thickness of the fuel pin cladding due to corrosion occurrence which had been irradiated in the experimental fast reactor Joyo. Dummy cladding provided with simulated inner corrosion was used to ascertain the technique applicability. This test confirmed that the decrease in wall thickness with simulated inner corrosion exceeding 30 μm in depth could be detected. In the case of irradiated fuel pins, the decrease in wall thickness due to corrosion occurrence was not detected because the depth was too small; the maximum depth of the inner corrosion was 14 μm. In addition, it should be noted that the physical changes on the cladding due to irradiation might have an influence on the signal.

37001559
Remote maintenance technology for a large scale hot laboratory
Sakamoto, Naoki; Yoshikawa, Katsunori; Kushida, Naoya; Katsuyama, Kozo; Nagamine, Tsuyoshi
Proceedings of 46th Annual Meeting of "Hot Laboratories and Remote Handling" Working Group (HOTLAB 2009) (CD-ROM) , 5p.(2009) ; (JAEA-J 06571)

The large-scale post irradiation examination facility for fast breeder reactor fuel assemblies has been operated since 1978 in JAEAs Oarai Research and Development Center. The facility has several hot cells and irradiated fuel assemblies are dismantled in the examination cell which is 6 m in length, 19.5 m in width and 7 m in height. Remote maintenance technology for use in the hot laboratory was established using electromechanical manipulators, in-cell cranes and a repair hoist system installed in the examination cell. The test equipment which is used for post irradiation examinations can be repaired using the electromechanical manipulators and in-cell cranes by remote handling. In addition, the electromechanical manipulators and in-cell cranes are designed to permit self-repair using the repair hoist system in the cell by remote handling.

37001560
Replacement technique for front acrylic panels of a large size glove box using bag-in / bag-out method
Endo, Shinya; Numata, Masami; Ichise, Kenichi; Nishi, Masahiro; Komiya, Tomokazu; Sakuraba, Naotoshi; Usami, Koji; Tomita, Takeshi
Proceedings of 46th Annual Meeting of "Hot Laboratories and Remote Handling" Working Group (HOTLAB 2009) (CD-ROM) , 6p.(2009) ; (JAEA-J 06572)

For safety operation and maintenance of the large size glove box, the degraded acrylic panels of the box must be replaced by the new panels. As the conventional replacement technique, the decontamination of the glove box and installation of isolation tent are necessary to prevent the leak of contamination, because airtight condition of the box is broken down during replacement process. Therefore, the prerequisite works are required considerable manpower. The new replacement technique using bag-in / bag-out method was developed by JAEA. In this technique, for keeping the airtight condition of the box, the inside of degraded panel is covered with an airtight panel and the outside is covered over the large bag which is used to replace the acrylic panels. As the benefits of this technique, the prerequisite works are not required and the manpower is less than a third of the conventional technique.

37001561
Adv.-ORIENT cycle; Its scientific progress and the engineering feasibility
Ozawa, Masaki; Suzuki, Tatsuya*; Koyama, Shinichi; Yamagishi, Isao; Fujita, Reiko*; Okada, Ken*; Tatenuma, Katsuyoshi*; Mimura, Hitoshi*; Fujii, Yasuhiko*
Proceedings of International Conference on Advanced Nuclear Fuel Cycle; Sustainable Options & Industrial Perspectives (Global 2009) (CD-ROM) , p.1117-1126(2009) ; (JAEA-J 06573)

Feasibility studies on Adv.-ORIENT Cycle are progressed allowing to use hydrochloric acid as well as nitric acid. Tertiary pyridine resin enabled to separate MA/Ln and then Am/Cm precisely from the irradiated nuclear fuel, and very pure Am and Cm products were recovered. Catalytic electrolytic extraction of RMFP(Rare Metal Fission Product) was verified. RMFP-deposit electrodes made from simulated HLLW showed high catalytic reactivity on electrolytic production of hydrogen. Hastelloy-B and Ta were confirmed their anti-corrosiveness in highly concentrated hydrochloric acid media. Thermo-chemical stability for Tertiary Pyridine Resin was verified in either HCl or HNO₃ media toward its practical use in the reprocessing. The separation and utilization of RMFP in spent fuel would not only open a new direction in fuel cycle mission, but also improve the existing process performance of reprocessing, vitrification and the repository tasks.

37001562
Study on FBR core concepts for the LWR-to-FBR transition period
Maruyama, Shuhei; Kawashima, Katsuyuki; Oki, Shigeo; Mizuno, Tomoyasu; Okubo, Tsutomu
Proceedings of International Conference on Advanced Nuclear Fuel Cycle; Sustainable Options & Industrial Perspectives (Global 2009) (CD-ROM) , p.1548-1556(2009) ; (JAEA-J 06574)

As part of the Fast Reactor Cycle Technology Development Project (FaCT), sodium-cooled fast reactor core design efforts have been made to cope with the TRU fuel composition changes expected during an LWR-to-FBR transition period. Since there are remarkable correlations between the burnup reactivity and the safety parameters such as the sodium void reactivity and the Doppler coefficient, it is possible to identify the design envelopes including any TRU compositions in the LWR-to-FBR transition period. The key core characteristics are assessed for both U-Pu core (Pu recycle scenario) and TRU core (TRU recycle scenario). As a result, general characteristics in the FaCT core design to cope with TRU composition changes are grasped.

37001563
Numerical simulation on thermal-hydraulic characteristics in fuel assemblies of supercritical water cooled reactors using two-fluid model analysis code ACE-3D
Nakatsuka, Toru; Misawa, Takeharu; Yoshida, Hiroyuki; Takase, Kazuyuki
Proceedings of International Conference on Advanced Nuclear Fuel Cycle; Sustainable Options & Industrial Perspectives (Global 2009) (CD-ROM) , p.1690-1693(2009) ; (JAEA-J 06575)

In order to assess the thermal hydraulics in fuel assemblies of the supercritical water cooled reactor (SCWR) core, JAEA has been enhancing the three-dimensional two-fluid model analysis code ACE-3D to predict thermal-hydraulic behavior of the SCWR. As a part of these assessments, the present paper describes numerical analysis results on thermal-hydraulic characteristics in the fuel assembly based on the design of the supercritical water cooled fast reactor (Super Fast Reactor) concept. The analytical geometry simulates a 19-rod assembly, which is one of the most simplified geometry of the SCWR fuel assembly and includes three kinds of different subchannel types: (1), adjacent to the channel box; (2), next to type (1); and (3), located inside types (1) and (2). The results show the influence of existence of the channel box and variation of the rod surface temperature profiles in the circumferential direction.

37001564
Nuclear nonproliferation technology development program for future nuclear energy systems in Japan
Senzaki, Masao; Inoue, Naoko; Kuno, Yusuke; Namba, Takashi
Proceedings of International Conference on Advanced Nuclear Fuel Cycle; Sustainable Options & Industrial Perspectives (Global 2009) (CD-ROM) , p.2128-2132(2009) ; (JAEA-J 06576)

The development program of the FR cycle system incorporating nuclear nonproliferation technologies has been conducted in Japan mainly by the Japan Atomic Energy Agency (JAEA). Four areas which are critical in acquiring international acceptance are identified. They are (1) technology that enhances proliferation resistance, (2) advanced safeguards technology, (3) development of proliferation resistance evaluation methodology, and (4) nuclear security and physical protection technology. In each area, close communication between the nuclear energy system and process designers and experts on nuclear nonproliferation safeguards and proliferation resistance is critical for the developed system to be recognized to be proliferation resistant and robust against proliferation threats.

37001565
Decommissioning program of FUGEN and current activities
Tezuka, Masashi; Mizui, Hiroyuki; Matsushima, Akira; Nakamura, Yasuyuki; Hayashi, Hirokazu; Sano, Kazuya; Nanko, Takashi; Morishita, Yoshitsugu
Proceedings of International Conference on Advanced Nuclear Fuel Cycle; Sustainable Options & Industrial Perspectives (Global 2009) (CD-ROM) , p.2815-2821(2009) ; (JAEA-J 06577)

FUGEN is a proto-type heavy water moderated, boiling light water cooled, pressure tube type reactor with 165MWe and has been shut downed on Mar. 2003. Following the approval of decommissioning program in 2008, stage of FUGEN was changed to the decommissioning of the facilities. The program consists of following four periods; (1) Spent fuel transportation, (2) Periphery facilities dismantlement, (3) Reactor dismantlement and (4) Building demolition. It is expected that the whole decommissioning will be completed until 2028. As a part of the work in the spent fuel transportation period, the main steam system and the feeder water system etc. are being dismantled in the turbine building. The remaining tritium in the heavy water system is also being removed for facilitating the dismantlement of the heavy water system. Moreover, method on dismantlement of the reactor core is being studied with considering the process under the water for the radiation shielding and the dust suppression.

37001566
Microstructure and mechanical property changes in fuel cladding during RIA-type temperature transients
Nagase, Fumihisa; Sugiyama, Tomoyuki; Fuketa, Toyoshi
Proceedings of OECD/NEA Workshop on Nuclear Fuel Behaviour during Reactivity Initiated Accidents (CD-ROM), 8p.(2009) ; (JAEA-J 06578)

Laboratory-scale experiments are performed to examine microstructure and mechanical property changes of the fuel cladding during temperature transients and estimate the fuel behavior for a wide temperature range under various RIA conditions. Ductility of the cladding generally increases with the temperature. The ductility increase of the hydrided cladding is obvious between 300 and 473 K, while it is small between 473 and 573 K. Ductility increase due to recrystallization is not expected during the RIA-type quick transient. On the other hand, phase transitions above 1100 K occur so quickly and affect the mechanical property of the cladding. The influence of the hydride rim at the cladding periphery would not be seen above 870 K since hydrides in the rim are in solid solution for a very short time.

37001567
Influence of initial conditions on rod behaviour during boiling crisis phase following a reactivity initiated accident
Georgenthum, V.*; Sugiyama, Tomoyuki
Proceedings of OECD/NEA Workshop on Nuclear Fuel Behaviour during Reactivity Initiated Accidents (CD-ROM), 9p.(2009) ; (JAEA-J 06579)

In the frame of their research programs on high burnup fuel safety, the IRSN and JAEA performed a large set of tests devoted to the study of PWR fuel rod behaviour during Reactivity Initiated Accident (RIA) respectively in the CABRI and NSRR. The test conditions are different in terms of coolant nature, temperature and pressure. In the CABRI reactor, tests were performed so far with sodium coolant at 280 °C and 3 bar. In the NSRR most of the tests were performed with stagnant water at 20 °C and atmospheric pressure, but recently a new high temperature high pressure capsule has been developed which allows up to 280 °C and 70 bar. This paper discusses the influence of test conditions on rod behaviour during boiling phase, based on test results and SCANAIR code calculations. The study shows that when the boiling crisis is reached, the initial inner and outer rod pressure have an essential impact on the clad strain and possible ballooning.

37001568
Numerical analysis and simulation of behavior of high burnup PWR fuel pulse-irradiated in reactivity-initiated accident conditions
Suzuki, Motoe; Sugiyama, Tomoyuki; Udagawa, Yutaka; Nagase, Fumihisa; Fuketa, Toyoshi
Proceedings of OECD/NEA Workshop on Nuclear Fuel Behaviour during Reactivity Initiated Accidents (CD-ROM), 11p.(2009) ; (JAEA-J 06580)

The fuel behavior during the fast transients in the two cases of NSRR experiments using high burnup PWR fuel rods are analyzed by using the RANNS code. In one case, cladding failure occurred whereas in the other case the rod survived but gave rise to departure from nucleate boiling. The analytical results are compared with the metallographic observations of failed part of the cladding to discuss the failure-determining condition in terms of incipient crack depth, temperature and stress at the depth. Based on these evaluations, sensitivity study with respect to the effect of initial temperature on the stress/strain of cladding is conducted. In addition, simulations are performed in commercial reactor conditions. The results were compared with each other and failure capability of cladding is discussed.

37001569
Applicability of NSRR room/high temperature test results to fuel safety evaluation under power reactor conditions
Sugiyama, Tomoyuki; Umeda, Miki; Udagawa, Yutaka; Sasajima, Hideo; Suzuki, Motoe; Fuketa, Toyoshi
Proceedings of OECD/NEA Workshop on Nuclear Fuel Behaviour during Reactivity Initiated Accidents (CD-ROM), 12p.(2009) ; (JAEA-J 06581)

Pulse irradiation tests of high burnup light water reactor fuels were performed at the Nuclear Safety Research Reactor (NSRR) in order to investigate transient fuel behavior and fuel failure limit under the reactivity-initiated accident (RIA) conditions. This paper presents new data from the NSRR high temperature tests at 250 to 290 °C as well as data from the room temperature tests at around 20 °C, and discusses the applicability of these data to the fuel safety evaluation under power reactor conditions.

37001570
Current RIA-related regulatory criteria in Japan and their technical basis
Fuketa, Toyoshi; Sugiyama, Tomoyuki
Proceedings of OECD/NEA Workshop on Nuclear Fuel Behaviour during Reactivity Initiated Accidents (CD-ROM), 12p.(2009) ; (JAEA-J 06582)

This paper will describe current Japanese regulatory criteria concerning fuel behavior during postulated reactivity-initiated accident (RIA) and experimental data providing technical basis with those criteria. The current safety evaluation guideline for the reactivity-initiated events in light water reactors was established by the Nuclear Safety Commission (NSC) of Japan in 1984 based mainly on the results of the NSRR experiments. In the guideline, an absolute limit of fuel enthalpy during an RIA is defined to avoid mechanical forces generation. The guideline also defines an allowable limit of fuel enthalpy for fuel design as a function of difference between rod internal pressure and system pressure. Because only limited number of data had been available, a series of experiments with pre-irradiated fuel rods were initiated in 1989 in the NSRR. After a series of experiments, the NSC issued a regulatory report regarding behavior of burnup fuels during a postulated RIA in 1998.

37001571
Water chemistry test at the Japan Materials Testing Reactor
Hanawa, Satoshi; Chimi, Yasuhiro; Nishiyama, Yutaka; Nakamura, Takehiko
Proceedings of Symposium on Water Chemistry and Corrosion in Nuclear Power Plants in Asia 2009 , p.221-225(2009) ; (JAEA-J 06583)

Water chemistry in reactor core environment is of great interest in structural materials integrity evaluation, because it plays an important role in corrosion behaviours of the materials. In order to provide significant information on stress corrosion crack growth behaviours, water chemistry tests under well quantified corrosive condition will be performed. In order to perform the tests, a new test facility is being constructed in the Japan Material Testing Reactor (JMTR). The tests will be performed under various conditions by changing water chemistry of feeding water, dose rate and flow rate at the irradiation test section etc. parametrically. The construction of the test facility will be finished in 2012 to start the tests.

37001572
Uncertainty reduction of hydrologic models using data from surface-based investigation
Karasaki, Kenji*; Ito, Kazumasa*; Wu, Y.*; Shimo, Michito*; Sawada, Atsushi; Maekawa, Keisuke; Hatanaka, Koichiro
Proceedings of TOUGH Symposium 2009 (Internet), 9p.(2009) ; (JAEA-J 06584)

We present some examples of using information other than pressure data to constrain the model. The initial model was constructed using information from surface geology and a few boreholes. Inversion analysis of pressure implied the existence of a low-permeability rock. We then used river flow data and temperature data from a hot spring as a basis for estimating the recharge flux, which suggested that the overall permeability of the modeled area could be one order of magnitude larger than that of the base model. Next, we simulated a saltwater washout process and compared the simulated salinity distribution with the salinity data from a borehole. We found that a better match to the salinity data is obtained if the increase of permeability is taken up by the fault zone rather than uniformly by the entire model. A smaller-scale match to the temperature, pressure, and density profiles from two boreholes indicated that there was a low permeability fault in between the two boreholes.

37001573
Numerical assessment of the influence of topographic and climatic perturbations on groundwater flow conditions
Saegusa, Hiromitsu; Yasue, Kenichi; Onoe, Hironori; Moriya, Toshifumi*; Nakano, Katsushi
Stability and Buffering Capacity of the Geosphere for Long-term Isolation of Radioactive Waste; Application to Crystalline Rock , p.257-267(2009) ; (JAEA-J 06585)

In the study, simulations of landform development and groundwater flow have been carried out in the Tono area in order to provide a method to evaluate the effects of long term topographic and climatic changes on groundwater flow conditions. Results of the simulations show the influence of the topographic and climatic perturbations on hydraulic gradient and groundwater velocity. In particular, the influence on hydraulic gradient downstream of the faults normal to the major direction of groundwater flow is much smaller than in the area upstream of the faults. Through this study, it has been confirmed that the method of combining simulations of landform development with groundwater flow is useful for the evaluation of effects of topographic and climatic perturbations on groundwater flow conditions.

37001574
Numerical evaluation of effects of lift force model on pressure loss in tight-lattice rod bundle (in Japanese)
Yoshida, Hiroyuki; Suzuki, Takayuki*; Takase, Kazuyuki
Dai-14-Kai Doryoku, Enerugi Gijutsu Shimpojiumu Koen Rombunshu , p.119-120(2009) ; (JAEA-J 06586)

37001575
Development of physical model describing the dynamic interaction characteristics of component connections for the analysis of an entire nuclear facility (in Japanese)
Nishida, Akemi
Dai-3-Kai Genshiryoku Shisutemu Kenkyu Kaihatsu Jigyo Heisei-20-Nendo Seika Hokokukai Shiryoshu (CD-ROM) , 2p.(2009) ; (JAEA-J 06587)

The objective of this project is to contribute to the seismic design evaluation of nuclear facilities through the construction of a numerical evaluation system which is able to evaluate both global and local behaviors of facilities under severe seismic events especially for next-generation nuclear system. As one of the technology components to realize this objective, we are developing and incorporating into the system a physical model describing the dynamic interaction characteristics of component connections. In this paper, we summarized about the adjustment of the proposed connection interaction model, considerations of the hybrid experiment results, and the application of the connection interaction model to a real plant simulation, as research and development results of this project which started in 2006.

37001576
Optical-parametric chirped-pulse amplification using a positive dispersive material for pulse stretching and compression (in Japanese)
Yamakawa, Koichi; Akahane, Yutaka; Ogawa, Kanade; Aoyama, Makoto
Denki Gakkai Hikari, Ryoshi Debaisu Kenkyukai Shiryo OQD-09-61 , p.13-16(2009) ; (JAEA-J 06588)

We have proposed and demonstrated a novel optical-parametric chirped-pulse amplification scheme in which an even order dispersion of an idler pulse is compensated by passing through an identical positive dispersive material used for temporal stretching a signal pulse. By compressing the idler pulses having a negatively chirp in this manner, high power sub-100 fs pulses were successfully obtained with only a transparent glass block used for the stretcher and compressor. A feasible design of real world femtosecond laser systems employing this scheme is also discussed.

37001577
Research review on novel ligands in nuclear back-end cycle (in Japanese)
Sasaki, Yuji; Suzuki, Shinichi; Ozawa, Masaki
Fain Kemikaru 38(10), p.47-62(2009) ; (JAEA-J 06589)

We reviewed the research for the novel ligand on the separation of actinides and fission products. Monoamide extractants have been developed in Japan and France for the substition of TBP-extraction. Other unique and excellent extractants including not only hard oxygen but also soft nitrogen donors for the separation of MA/Ln, Am/Cm and the recovery of platinum group, Cs and Sr have been widely proposing. These promising extractants are requested to attain the high selectivity, loading capacity, stability in non-polar solvent and radiolytic protection, the related researches are progressing aggressively.

37001578
Measurement of droplet quality by throttling calorimeter (in Japanese)
Tamai, Hidesada; Nagayoshi, Takuji; Katono, Kenichi; Ito, Takashi; Takase, Kazuyuki
Nippon Konsoryu Gakkai Nenkai Koenkai 2009 Koen Rombunshu , p.2(2009) ; (JAEA-J 06590)

The characteristics of carryover from free-surface in a natural-circulation BWR are an important subject to be resolved for economic and safe design of the reactor. In this study, droplet quality of the carryover in a test section with 0.12 m in diameter was measured using throttling calorimeter with pressure ranging from 1.5-2.5 MPa. The measured droplet quality increases with decrease in distance from free-surface and with increase in vapor volumetric flux, and these trends are similar to those of previous data.

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JAEA > JAEA Library > JOPSS > Papers Published in Journals [Back Issues] > December 2009