Papers Published in Journals
-Research results below have been sorted by order of journals name.
-Sorry, some research results below have no English abstract.

August 2008

36001065
Automated gravimetric sample pretreatment using an industrial robot for high-precision determination of plutonium by isotope dilution mass spectrometry
Surugaya, Naoki; Hiyama, Toshiaki; Watahiki, Masaru
Analytical Sciences 24(6), p.739-744(2008) ; (JAEA-J 04382)
 A robotized sample preparation method for the determination of Pu, which is recovered by extraction reprocessing of spent nuclear fuel, by isotope dilution mass spectrometry is described. The automated system has a six-axis industrial robot, whose motility is very fast, accurate and flexible, installed in a glove box. The automation of the weighing and diluting steps enables operator-unattended sample pretreatment for highly precise analyses of Pu in aqueous solutions. By the developed system, Pu concentration in HNO3 medium was successfully determined with a set of subsequent mass spectrometric measurements. The relative uncertainty in determining the concentration of Pu by isotope dilution mass spectrometry using this system for sample pretreatment was estimated to be less than 0.1 rel.% (k=2), which is equal to that expected of a talented analyst. The operation time required was the same as that by a skilled operator.
36001066
Differences in internal dynamics of actin under different structural states detected by neutron scattering
Fujiwara, Satoru; Plazanet, M.*; Matsumoto, Fumiko; Oda, Toshiro*
Biophysical Journal 94(12), p.4880-4889(2008) ; (JAEA-J 04383)
 Actin plays crucial roles in various aspects of cell motility. Flexibility of F-actin, a filamentous polymer formed by polymerization of the monomers (G-actin), is important for such a variety of functions. This flexibility allows F-actin to interact with various proteins, thereby expressing multiple functions. Understanding the variety of functions of actin thus requires understanding the flexibility of F-actin. As a first step towards this ultimate purpose, we carried out elastic incoherent neutron scattering (EINS) experiments on G-actin and F-actin under hydrated states. The mean square displacement (MSD) was estimated from the EINS measurements. Temperature dependence of MSD showed that two dynamical transitions occur at about 150 K and about 245 K, and that behavior of MSD is different between G-actin and F-actin, such that G-actin is "softer" than F-actin. The different behavior observed is ascribed to the differences in dynamical heterogeneity between F-actin and G-actin.
36001067
Effect of SOL decay length on modeling of divertor detachment by using simple core-SOL-divertor model
Hiwatari, Ryoji*; Hatayama, Akiyoshi*; Takizuka, Tomonori
Contributions to Plasma Physics 48(1-3), p.174-178(2008) ; (JAEA-J 04384)
 
36001068
Silencing of CPD photolyase makes Arabidopsis hypersensitive and hypermutable in response to UV-B radiation
Yoshihara, Ryohei; Nakane, Chiyoko*; Sato, Ryohei*; Yasuda, Ai*; Takimoto, Koichi*
Genes and Environment 30(2), p.53-61(2008) ; (JAEA-J 04385)
 We generated a CPD photolyase knock-down in Arabidopsis thaliana by RNAi to investigate the role of CPD photorepair for protection of plants from solar UV. These knock-down lines exhibited hypersensitivity to UV-B and an increased occurrence of mutation induced by UV-B radiation compared with Arabidopsis proficient in CPD photolyase. These results indicate that CPD photoreactivation plays an important role for UV resistance of Arabidopsis and suppression of UV-induced mutagenesis.
36001069
Mechanical design of JT-60SA magnet system
Tsuchiya, Katsuhiko; Suzuki, Yutaka; Kizu, Kaname; Yoshida, Kiyoshi; Tamai, Hiroshi; Matsukawa, Makoto; Dolgetta, N.*; Portafaix, C.*; Zani, L.*; Pizzuto, A.*
IEEE Transactions on Applied Superconductivity 18(2), p.208-211(2008) ; (JAEA-J 04386)
 Magnet system in JT-60SA consists of 18 toroidal field coils, 7 plasma equilibrium field (EF) coils, and central solenoid (CS) that has 4 modules of solenoids. Mechanical design of EF coils and CS is optimized in order to obtain the broad operational space of plasmas that are double-null plasma with high plasma current for high performance operation and ITER-like configuration with IP=3.5MA for ITER-relevant experiment. In the former design, called NCT, divertor coil (EF4) is made of Nb3Sn conductor, as well as CS conductor. However, it is clear that 6.2T of Bmax is significant to operate ITER-like plasma. Therefore, material of cable for EF4 conductor is changed into NbTi, so that this contributes to cost reduction. Regarding CS design, material of conduit is changed into JK2LB in order to simplify the structure of pre-compression. Stress analysis for support structure and winding pack of EF coils and CS is currently carried out. In the case where the vertical unbalance force of CS is largest in the designed plasma operation, peak stress of conduit is less than fatigue limit in 18,000 cycles that is designed number of plasma shot in JT-60SA. This result shows the recent design of CS conductor has significant mechanical strength.
36001070
Conductor design of CS and EF coils for JT-60SA
Kizu, Kaname; Tsuchiya, Katsuhiko; Yoshida, Kiyoshi; Edaya, Masahiro; Ichige, Toshikatsu*; Tamai, Hiroshi; Matsukawa, Makoto; della Corte, A.*; Di Zenobio, A.*; Muzzi, L.*; Turtù, S.*; Duchateau, J. L.*; Zani, L.*
IEEE Transactions on Applied Superconductivity 18(2), p.212-215(2008) ; (JAEA-J 04387)
 The maximum magnetic field and maximum current of CS and EF coils is 9 T, 20 kA and 6.2 T, 21 kA, respectively. The conductor for CS is Nb3Sn CIC conductor with JK2LB conduit. On the other hand, EF coil conductors are NbTi CIC conductor with SS316LN conduit. In order to reduce the pressure drop and to raise the temperature margin against large AC loss and nuclear heating, central spiral is introduced inside cable. The Tcs margin and stability analyses of the CS and EF coils are performed by using the one-dimensional fluid analysis code with transient heat loads. These coils have enough high Tcs and stability margin against the operational scenario.
36001071
A New design for JT-60SA Toroidal field coils conductor and joints
Zani, L.*; Pizzuto, A.*; Semeraro, L.*; Ciazynski, D.*; Cucchiaro, A.*; Decool, P.*; della Corte, A.*; Di Zenobio, A.*; Dolgetta, N.*; Duchateau, J. L.*; Hertout, P.*; Kikuchi, Mitsuru; Lacroix, B.*; Molinie, F.*; Muzzi, L.*; Nicollet, S.*; Petrizzi, L.*; Portafaix, C.*; Ramogida, G.*; Roccella, S.*; Turck, B.*; Turtù, S.*; Verger, J. M.*; Villari, R.*; Yoshida, Kiyoshi
IEEE Transactions on Applied Superconductivity 18(2), p.216-219(2008) ; (JAEA-J 04388)
 The upgrade of JT-60U to JT-60 Super Advanced (JT-60SA), a fully superconducting tokamak, will be performed in the framework of the Broader Approach (BA) agreement between Europe (EU) and Japan. In particular, the Toroidal Field (TF) system, which includes 18 coils, is foreseen to be procured by France, Italy and Germany. This work covers activities from design and manufacturing to shipping to Japan. The present paper is mainly devoted to the analyses that lead to the conductor design and to the technical specifications of the joints for the JT-60SA TF coils. The conductor geometry is described, which is derived from Cable-In-Conduit concept and adapted to the actual JT-60SA tokamak operating conditions, principally the ITER-like scenario. The reported simulations and calculations are particularly dealing with the stability analysis and the power deposition during normal and off-normal conditions (AC losses, nuclear heating). The final conductor solution was selected through a trade-off between scientific approach and industrial technical orientation. Besides, the TF system connections layout is shown, derived from the industrially assessed twin-box concept, together with the associated thermo-hydraulic calculations ensuring a proper temperature margin.
36001072
Conceptual design of superconducting magnet system for JT-60SA
Yoshida, Kiyoshi; Kizu, Kaname; Tsuchiya, Katsuhiko; Tamai, Hiroshi; Matsukawa, Makoto; Kikuchi, Mitsuru; della Corte, A.*; Muzzi, L.*; Turtù, S.*; Di Zenobio, A.*; Pizzuto, A.*; Portafaix, C.*; Nicollet, S.*; Lacroix, B.*; Decool, P.*; Duchateau, J. L.*; Zani, L.*
IEEE Transactions on Applied Superconductivity 18(2), p.441-446(2008) ; (JAEA-J 04389)
 The upgrade of JT-60U magnet system to superconducting coils (JT-60SA) has been decided by both parties of Japan and EU in the framework of the Broader Approach agreement. The magnet system for JT-60SA consists of 18 toroidal field (TF) coils, a central solenoid (CS) with four modules, seven equilibrium field (EF) coils. TF case encloses the winding pack and is the main structural component. CS consists of four winding pack modules with its pre-load structure. Seven EF coils are attached to the TF coil cases through supports which include flexible plates. Since CS modules are operated at high magnetic field, Nb3Sn superconductor is used. While NbTi superconductor is used in TF coils and EF coils. The magnet system has large heat load from nuclear heating by DD fusion and large AC loss from control actions. This paper descries the technical requirements, the operational interface and the conceptual design of the superconducting magnet system for JT-60SA.
36001073
Performance of Japanese Nb3Sn conductors for ITER toroidal field coils
Takahashi, Yoshikazu; Isono, Takaaki; Koizumi, Norikiyo; Nunoya, Yoshihiko; Matsui, Kunihiro; Nabara, Yoshihiro; Hemmi, Tsutomu; Oshikiri, Masayuki; Uno, Yasuhiro*; Okuno, Kiyoshi; Stepanov, B.*; Bruzzone, P.*
IEEE Transactions on Applied Superconductivity 18(2), p.471-474(2008) ; (JAEA-J 04390)
 The ITER TF coil system consists of 18 D-shape coils. The operating current and the maximum field are 68 kA and 11.8 T, respectively. A Nb3Sn cable-in-conduit conductor with a central channel is used, with a unit length of about 380 m. A cable consists of 900 Nb3Sn strands and 522 Cu strands with a diameter of 0.82 mm. Superconducting performance of full-size conductors manufactured was measured at the operating condition of the TF coils with the maximum field. The strands made by bronze and internal-Sn methods were used for the sample conductors with a void fraction of 29% and 33%, respectively. The measured current sharing temperatures Tcs are 6.5-6.7K for the bronze route method and 5.7-5.9K for the internal-Sn method. The Tcs of the conductor with small void fraction is relatively higher with 0.1-0.2K than that with large void fraction. It is confirmed that Tcs of both strands is higher than the design value (5.7K). It is shown from the results that the strain on the conductor, estimated by the strand data, is about -0.7%. This value seems to be reasonable.
36001074
JT-60SA toroidal field magnet system
Pizzuto, A.*; Semeraro, L.*; Zani, L.*; Bayetti, P.*; Cucchiaro, A.*; Decool, P.*; della Corte, A.*; Di Zenobio, A.*; Dolgetta, N.*; Duchateau, J. L.*; Fietz, W. H.*; Heller, R.*; Hertout, P.*; Kikuchi, Mitsuru; Kizu, Kaname; Lacroix, B.*; Muzzi, L.*; Nicollet, S.*; Polli, G. M.*; Portafaix, C.*; Reccia, L.*; Turtù, S.*; Verger, J. M.*; Villari, R.*; Yoshida, Kiyoshi
IEEE Transactions on Applied Superconductivity 18(2), p.505-508(2008) ; (JAEA-J 04391)
 The Broader Approach agreement between Europe and Japan includes the construction of a fully superconducting tokamak, the JT-60 Super Advanced (JT-60SA), as a satellite experiment to ITER. Toroidal field (TF) magnet which consists of 18 D-shaped coils will be provided to Japan by EU. TF coil main constituents are conductor, winding pack, joints, casing and current leads. The design criteria about conductor and structure were discussed between JA and EU adopted to fulfill the machine requirements. The results of the analyses performed by EU and JA to define and assess the TF magnet system conceptual design, are reported and commented.
36001075
Comparison of DNA hydration patterns obtained using two distinct computational methods, molecular dynamics simulation and three-dimensional reference interaction site model theory
Yonetani, Yoshiteru*; Maruyama, Yutaka*; Hirata, Fumio*; Kono, Hidetoshi
Journal of Chemical Physics 128(18), p.185102_1-185102_9(2008) ; (JAEA-J 04392)
 Although high-resolution, crystal structure analyses have given us a view of tightly bound water molecules on their surface, the structural data is still insufficient to capture the detailed configurations of water molecules around the surface of these biomolecules. Thanks to the invention of various computational algorithms, computer simulations can now provide an atomic view of hydration. Here we describe the apparent patterns of DNA hydration calculated using two different computational methods, MD simulation and 3D-RISM theory. This rigorous comparison showed that MD and 3D-RISM provide essentially similar hydration patterns when there is sufficient sampling time for MD and a sufficient number of conformations to describe molecular flexibility for 3D-RISM. This suggests that these two computational methods can be used to complement one another when evaluating the reliability of calculated hydration patterns.
36001076
Numerical evaluation of fluid mixing phenomena in boiling water reactor using advanced interface tracking method
Yoshida, Hiroyuki; Takase, Kazuyuki
Journal of Fluid Science and Technology (Internet) 3(2), p.311-322(2008) ; (JAEA-J 04393)
 In this study, a detailed Two-Phase Flow simulation code using advanced Interface Tracking method: TPFIT is developed to calculate the detailed information of the two-phase flow. In this paper, firstly, we try to verify the TPFIT code by comparing it with the existing 2-channel air-water mixing experimental results. Secondary, the TPFIT code is applied to simulation of steam-water two-phase flow in a model of two subchannels of a current BWRs and FLWRs rod bundle. The existing two-phase flow correlation for fluid mixing is evaluated using numerical simulation data. This data indicates that pressure difference between fluid channels is responsible for the fluid mixing, and thus the effects of the time average pressure difference and fluctuations must be incorporated in the two-phase flow correlation for fluid mixing. When inlet quality ratio of subchannels is relatively large, it is understood that evaluation precision of the existing two-phase flow correlations for fluid mixing are relatively low.
36001077
LES on plume dispersion in the convective boundary layer capped by a temperature inversion
Nakayama, Hiromasa; Tamura, Tetsuro*; Abe, Satoshi*
Journal of Fluid Science and Technology (Internet) 3(4), p.519-532(2008) ; (JAEA-J 04394)
 Large-eddy simulation is applied to the problem of plume dispersion in convective boundary layer (CBL) flow, which is time-sequentially generated by unsteady numerical simulation of spatially-developing boundary layer capped by a temperature inversion in the driver unit. Our objective is to investigate the characteristics of plume dispersion in CBL flow compared with the case in the neutral boundary layer.
36001078
Reaction kinetics analysis of damage evolution in accelerator driven system beam windows
Yoshiie, Toshimasa*; Xu, Q.*; Sato, Koichi*; Kikuchi, Kenji; Kawai, Masayoshi*
Journal of Nuclear Materials 377(1), p.132-135(2008) ; (JAEA-J 04395)
 Reaction kinetic analysis was used to estimate the damage evolution in window materials of 800 MWth ADS. Parameters were fitted to F82H of the STIP-II experiment and EC316LN of the STIP-I experiment. In F82H, the concentration of bubbles was almost constant and the bubble size increased, while the concentration of interstitial type dislocation loops increased and their size was constant between 3×10-3 and 300 dpa. EC316LN showed almost the same behavior. Swelling increased almost linearly with irradiation dose above 3 dpa between 673 K and 773 K.
36001079
Precise intensity measurements in the 14N(n,γ)15N reaction as a γ-ray intensity standard up to 11 MeV
Miyazaki, Itaru*; Sakane, Hitoshi*; Takayama, Hirokazu*; Kasaishi, Masafumi*; Tojo, Akinori*; Furuta, Masataka*; Hayashi, Hiroaki*; Suematsu, Osamu*; Narasaki, Hiromichi*; Shimizu, Toshiaki*; Shibata, Michihiro*; Kawade, Kiyoshi*; Taniguchi, Akihiro*; Harada, Hideo
Journal of Nuclear Science and Technology 45(6), p.481-486(2008) ; (JAEA-J 04396)
 The intensities of the prompt γ rays from the 14N(n,γ)15N reaction have been precisely measured. As the samples, a liquid nitrogen target and a deuterated melamine (C3D6N6) were used. The previous values widely used as intensity standards agreed with those obtained in this study within 4-5% in the 2-11 MeV region, however, showed a monotonous decrease with the increase of γ-ray energy.
36001080
Influence of framework silica-to-alumina ratio on the tritiated water adsorption and desorption caracteristics of NaX and NaY zeolites
Iwai, Yasunori; Yamanishi, Toshihiko
Journal of Nuclear Science and Technology 45(6), p.532-540(2008) ; (JAEA-J 04397)
 The fixed-bed adsorption process has been studied for the recovery of tritiated water in the field of nuclear fusion. The influence of framework SiO2/Al2O3 ratio ranging from 2.0 to 10.0 on the tritiated water adsorption and desorption characteristics in the H2O-HTO binary system was systematically examined using NaX and NaY zeolite. Large difference in isotherm was observed by changing a SiO2/ Al2O3 ratio from 7.0 to 10.0. The flamework SiO2 to Al2O3 ratio has a slight effect on the isotope separation factor. The removable water capacity of NaY10.0 at around room temperature is approximately four times larger than that of NaA2.0. HTO dehydration ratio has strong interrelation with accumulative amount of purge gas. The size of water absorber can be downscaled with NaY10.0 since the consideration of heating and cooling period necessary for temperature swing desorption process is not required.
36001081
Effect of rod bowing on critical power based on tight-lattice 37-rod bundle experiments
Tamai, Hidesada; Kureta, Masatoshi; Liu, W.; Sato, Takashi; Nakatsuka, Toru; Onuki, Akira; Akimoto, Hajime
Journal of Nuclear Science and Technology 45(6), p.567-574(2008) ; (JAEA-J 04398)
 The confirmation of thermal-hydraulic performance is one of the most important requirements for the design of the FLWR. A large-scale thermal-hydraulic experiment using a tight-lattice 37-rod bundle test section with a bowed rod was carried out with pressure ranging from 2-9 MPa and mass velocity at 200-1000 kg/(m2s). It was confirmed that boiling transition (BT) occurs downstream of the rod contact point, and that the wall temperature trace during the BT follows the typical BT pattern of BWR. Critical power with a bowed rod is about 10 percent lower than that without rod bowing. The critical power increases monotonically with increase in mass velocity, with decrease in inlet water temperature, and with decrease in exit pressure, and these trends are similar to those of the basic bundle without rod bowing. Thus, there is negligible effect of rod bowing on the dependence of critical power on the mass velocity, the inlet temperature and the exit pressure.
36001082
Reconstruction of Cu(111) induced by a hyperthermal oxygen molecular beam
Moritani, Kosuke*; Okada, Michio*; Teraoka, Yuden; Yoshigoe, Akitaka; Kasai, Toshio*
Journal of Physical Chemistry C 112(23), p.8662-8667(2008) ; (JAEA-J 04399)
 This paper reports a study on the reconstruction at Cu(111) surface induced by a hyperthermal oxygen molecular beam (HOMB) at room temperature. The HOMB incidence at translational energies larger than 0.5 eV induced surface reconstruction in the oxygen coverage larger than 0.27 ML. On the other hand, long-range-ordered structures were not formed even at the oxygen coverage of 0.4 ML for the backfilling of thermal O2 at room temperature. The O1s XPS peak for the HOMB incidence at room temperature was resolved into two components, 529.4 and 528.9 eV, at the oxygen coverage larger than 0.27 ML, which can be assigned to the O atoms occupying the threefold hollow sites on the unreconstructed Cu(111) surface and four-coordinated sites on the reconstructed structure, respectively. Annealing the reconstructed surface at 620 K decreased the oxygen coverage to 0.27 ML and induced so-called "29" superstructure.
36001083
Detailed atomic modeling of Sn plasmas for the EUV source
Sasaki, Akira; Sunahara, Atsushi*; Nishihara, Katsunobu*; Nishikawa, Takeshi*; Koike, Fumihiro*; Tanuma, Hajime*
Journal of Physics; Conference Series 112, p.042062_1-042062_4(2008) ; (JAEA-J 04400)
 
36001084
Innovative alpha radioactivity monitor for clearance level inspection based on ionized air transport technology; CFD-simulated and experimental ion transport efficiencies for uranium-attached pipes
Hirata, Yosuke*; Nakahara, Katsuhiko*; Sano, Akira*; Sato, Mitsuyoshi*; Aoyama, Yoshio; Miyamoto, Yasuaki; Yamaguchi, Hiromi; Nambu, Kenichi*; Takahashi, Hiroyuki*; Oda, Akinori*
Journal of Power and Energy Systems (Internet) 2(2), p.561-572(2008) ; (JAEA-J 04401)
 An innovative alpha radioactivity monitor for clearance level inspection has been developed. This apparatus measures an ion current resulting from air ionization by alpha particles. Ions generated in a measurement chamber of about 1 m3 in volume are transported by airflow to a sensor and measured. This paper presents computational estimation of the ion transport efficiencies for two pipes with different lengths, the inner surfaces of which were covered with a thin layer of uranium. These ion transport efficiencies were compared with those experimentally obtained for the purpose of validating our model. Good agreement was observed between transport efficiencies from simulations and those experimentally estimated. Dependence of the transport efficiencies on the region of uranium coverage was also examined, based on which such characteristics of ion currents as anticipated errors arising from unknown contaminated positions are also discussed to clarify the effective operation conditions of this monitor.
36001085
Two-dimensional stress corrosion cracking model for reactor structural materials
Igarashi, Takahiro; Miwa, Yukio; Kaji, Yoshiyuki; Tsukada, Takashi
Journal of Power and Energy Systems (Internet) 2(4), p.1188-1196(2008) ; (JAEA-J 04402)
 The two-dimensional intergranular stress corrosion cracking (IGSCC) growth model has been developed to simulate branching cracks of IGSCC. In the model, the IGSCC is grown using the "grain-scaled" factors such as the length and strength of grain boundary and so on. Especially, the corrosion of grain boundary and the influence of shear stress acting on the grain boundary are introduced in the model. Using the model, computer simulation of crack growth was carried out under several load conditions with changing the ratio of axial to shear stress against the grain boundary. As a result of the simulations, we found out that the cause of crack branching was the influence of shear stress against the grain boundary, and that the synergistic effect of shear stress and corrosion of grain boundary leads to the oblique crack growth.
36001086
Oxygen potential measurement of americium oxide by electromotive force method
Otobe, Haruyoshi; Akabori, Mitsuo; Minato, Kazuo
Journal of the American Ceramic Society 91(6), p.1981-1985(2008) ; (JAEA-J 04403)
 The oxygen potentials of AmO2-x were measured in the x range of 0.01 to 0.5 and the temperature range of 1000 to 1333 K by the electromotive force (EMF) method. The oxygen potentials at 1333 K were -19.83 kJ/mol for x=0.01 and -319.1 kJ/mol for x=0.485, which were higher than those of CeO2-x by approximately 200 kJ/mol for the corresponding x values. From the dependence of the oxygen potentials on x and temperature, a tentative phase diagram of Am-O system was proposed, which suggested the presence of the intermediate phases of Am7O12 and Am9O16 in the Am-O system.
36001087
Single crystal growth and de Haas-van Alphen effect in Lu2Rh3Ga9 with quasi-two-dimensional electronic state
Nguyen, D.; Matsuda, Tatsuma; Haga, Yoshinori; Ikeda, Shugo*; Yamamoto, Etsuji; Endo, Toyoaki*; Settai, Rikio*; Harima, Hisatomo*; Onuki, Yoshichika
Journal of the Physical Society of Japan 77(6), p.064708_1-064708_6(2008) ; (JAEA-J 04404)
 We succeeded in growing a single crystal of a layered compound Lu2Rh3Ga9 with an Y2Co3Ga9-type orthorhombic crystal structure by the Ga-flux method. The lattice, positional, and thermal parameters were determined by single-crystal X-ray diffraction measurement. We also measured the electrical resistivity, specific heat, and de Haas-van Alphen (dHvA) effect. The detected dHvA branches were well explained by the results of full potential LAPW energy band calculations. The electronic state was found to be quasi-two-dimensional, indicating nearly cylindrical Fermi surfaces along the [001] direction.
36001088
Proliferation and cell death of human glioblastoma cells after carbon-ion beam exposure; Morphologic and morphometric analyses
Oishi, Takuma*; Sasaki, Atsushi*; Hamada, Nobuyuki*; Ishiuchi, Shogo*; Funayama, Tomoo; Sakashita, Tetsuya; Kobayashi, Yasuhiko; Nakano, Takashi*; Nakazato, Yoichi*
Neuropathology 28(4), p.408-416(2008) ; (JAEA-J 04405)
 Using CGNH-89 cells exposed to 0-10 Gy of X-ray (140 kVp) or carbon-ions (18.3 MeV/nucleon, LET = 108 keV/μm), we performed conventional histology and immunocytochemistry with MIB-1 antibody, transmission electron microscopy, and computer-assisted, nuclear size measurements. After carbon-ion and X-ray exposure, living cells showed decreased cell number, nuclear condensation, increased atypical mitotic figures, and a tendency of cytoplasmic enlargement at the level of light microscopy. The deviation of the nuclear area size increased during 48 hours after irradiation, while the small cell fraction increased in 336 hours. In glioblastoma cells of the control, 5 Gy carbon-beam, and 10 Gy carbon-beam, and MIB-1 labeling index decreased in 24 hours but increased in 48 hours. Ultrastructurally, cellular enlargement seemed to depend on vacuolation, swelling of mitochondria, and increase of cellular organelles, such as the cytoskeleton and secondary lysosome. We could not observe apoptotic bodies in the CGNH-89 cells under any conditions. We conclude that carbon-ion irradiation induced cell death and senescence in a glioblastoma cell line with mutant TP53. Our results indicated that the increase of large cells with enlarged and bizarre nuclei, swollen mitochondria, and secondary lysosome occurred in glioblastoma cells after carbon-beam exposure.
36001089
Nuclear data sheets for A=124
Katakura, Junichi; Wu, Z. D.*
Nuclear Data Sheets 109(7), p.1655-1877(2008) ; (JAEA-J 04406)
 The 1997 evaluation for A=124 mass chain has been revised using experimental results from decays and reactions. Adopted values for the level and decay properties are tabulated. Inconsistencies and discrepancies are noted.
36001090
X-ray magnetic circular dichroism and photoemission studies of ferromagnetism in CaMn1-xRuxO3 thin films
Terai, Kota*; Yoshii, Kenji; Takeda, Yukiharu; Fujimori, Shinichi; Saito, Yuji; Owada, Kenji; Inami, Toshiya; Okane, Tetsuo; Arita, Masashi*; Shimada, Kenya*; Namatame, Hirofumi*; Taniguchi, Masaki*; Kobayashi, Keisuke*; Kobayashi, Masaki*; Fujimori, Atsushi*
Physical Review B 77(11), p.115128_1-115128_6(2008) ; (JAEA-J 04408)
 We have studied the electronic and magnetic properties of epitaxially grown CaMn1-xRuxO3 thin films ( x = 1.0, 0.75, 0.5) by soft X-ray absorption (XAS), soft X-ray magnetic circular dichroism (XMCD) and hard X-ray photoemission spectroscopy (HXPES) measurements. The XMCD studies indicated that the spin moments of Mn and Ru are aligned in opposite directions. The valence-band HXPES spectra revealed that the Ru 4d t2g states around the Fermi level and the Mn 3d t2g up-spin states centered ∼ 2 eV below it, both of which showed systematic concentration dependences. From these results, we propose that the localized Mn 3d t2g states and the itinerant Ru 4d t2g band are antiferromagnetically coupled and give rise to the ferromagnetic ordering, in analogy to the mechanism proposed for double perovskite oxides such as Sr2FeMoO6.
36001091
One-quasiparticle bands in neutron-rich 187W
Shizuma, Toshiyuki; Ishii, Tetsuro; Makii, Hiroyuki*; Hayakawa, Takehito; Matsuda, Makoto; Shigematsu, Soichiro*; Ideguchi, Eiji*; Zheng, Y.*; Liu, M.*; Morikawa, Tsuneyasu*; Oi, Makito*
Physical Review C 77(4), p.047303_1-047303_4(2008) ; (JAEA-J 04409)
 Modest spin states in neutron-rich 187W have been populated using a 186W(18O,17O) one-neutron transfer reaction. While negative-parity bands previously known are extended to higher spin, two positive-parity bands are newly identified. Configurations based on ν i13/2 orbitals are assigned to these bands from an analysis of the level energy systematics as well as the g-factors derived from in-band branching ratios.
36001092
Effects of nuclear orientation on the mass distribution of fission fragments in the reaction 36S + 238U
Nishio, Katsuhisa; Ikezoe, Hiroshi; Mitsuoka, Shinichi; Nishinaka, Ichiro; Nagame, Yuichiro; Watanabe, Yutaka*; Otsuki, Tsutomu*; Hirose, Kentaro*; Hofmann, S.*
Physical Review C 77(6), p.064607_1-064607_5(2008) ; (JAEA-J 04410)
 Fragment mass distributions for fission after full momentum transfer were measured for the reaction 36S + 238U at bombarding energies around the Coulomb barrier. The data revealed a transition from symmetry to asymmetry mass distributions when the beam energies were decreased from above-barrier to sub-barrier values. The main components of the asymmetric mass distribution are at AH ≈ 200 and AL ≈ 74. The asymmetric fission is attributed to quasifission of the reacting system at polar collisions, whereas the symmetric fission originates from the compound nucleus produced in equatorial collisions. The results suggest a strong influence of orientation effects of the deformed target nuclei on fusion.
36001093
Direct observation of dispersive Kondo resonance peaks in a heavy-fermion system
Im, H. J.*; Ito, Takahiro*; Kim, H.-D.*; Kimura, Shinichi*; Lee, K. E.*; Hong, J. B.*; Kwon, Y. S.*; Yasui, Akira; Yamagami, Hiroshi
Physical Review Letters 100(117), p.176402_1-176402_4(2008) ; (JAEA-J 04412)
 Ce 4d-4f resonant angle-resolved photoemission spectroscopy was carried out to study the electronic structure of strongly correlated Ce 4f electrons in a quasi-two-dimensional nonmagnetic heavy-fermion system CeCoGe1.2Si0.8. For the first time, dispersive coherent peaks of an f state crossing the Fermi level, the so-called Kondo resonance, are directly observed together with the hybridized conduction band. Moreover, the experimental band dispersion is quantitatively in good agreement with a simple hybridization-band picture based on the periodic Anderson model. The obtained physical quantities, i.e., coherent temperature, Kondo temperature, and mass enhancement, are comparable to the results of thermodynamic measurements. These results manifest an itinerant nature of Ce 4f electrons in heavy-fermion systems and clarify their microscopic hybridization mechanism.
36001094
Efficient production of a collimated MeV proton beam from a Polyimide target driven by an intense femtosecond laser pulse
Nishiuchi, Mamiko; Daido, Hiroyuki; Yogo, Akifumi; Orimo, Satoshi; Ogura, Koichi; Ma, J.-L.; Sagisaka, Akito; Mori, Michiaki; Pirozhkov, A. S.; Kiriyama, Hiromitsu; Bulanov, S. V.; Esirkepov, T. Z.; Choi, I. W.*; Kim, C. M.*; Jeong, T. M.*; Yu, T. J.*; Sung, J. H.*; Lee, S. K.*; Hafz, N.*; Pae, K. H.*; Noh, Y.-C.*; Ko, D.-K.*; Lee, J.*; Oishi, Yuji*; Nemoto, Koshichi*; Nagatomo, Hideo*; Nagai, Keiji*; Azuma, Hirozumi*
Physics of Plasmas 15(5), p.053104_1-053104_10(2008) ; (JAEA-J 04413)
 High-flux energetic protons whose maximum energies are up to 4 MeV are generated by an intense femtosecond Titanium Sapphire laser pulse interacting with a 7.5, 12.5, and 25μm thick Polyimide tape targets. The laser pulse energy is 1.7 J, duration is 34 fs, and intensity is 3×1019Wcm-2. The amplified spontaneous emission (ASE) has the intensity contrast ratio of 4×10-8. The conversion efficiency from laser energy into proton kinetic energies of ∼3% is achieved, which is comparable or even higher than those achieved in the previous works with nanometer-thick targets and the ultrahigh contrast laser pulses (∼10-10).
36001095
Analysis of (K-,K+) inclusive spectrum with semiclassical distorted wave model
Hashimoto, Shintaro; Kono, Michio*; Ogata, Kazuyuki*; Kawai, Mitsuji*
Progress of Theoretical Physics 119(6), p.1005-1027(2008) ; (JAEA-J 04414)
 The inclusive K+ momentum spectrum in the 12C(K-,K+) reaction is calculated by the semiclassical distorted wave (SCDW) model, including the transition to the Xi- bound state. We compare the calculated results with those of the previous analysis with Green's function method and that with the intra-nuclear cascade (INC) model, and examine the validity of the assumptions made in those analyses. The calculated spectra with the strength of the Xi--nucleus potential -50, -20 and +10 MeV are compared with the experimental data measured at High Energy Accelerator Research Organization (KEK) with pK-=1.65GeV/c. The shape of the spectrum is reproduced by the calculation, and the inclusive spectrum changes systematically with the assumed strength of the Xi--nucleus potential, but no useful constraint on the strength is obtained from the present analysis.
36001096
Expression of the extracellular region of the human interleukin-4 receptor α chain and interleukin-13 receptor α1 chain by a silkworm-baculovirus system
Honjo, Eijiro; Shoyama, Yoshinari; Tamada, Taro; Shigematsu, Hideki*; Hatanaka, Takaaki*; Kanaji, Sachiko*; Arima, Kazuhiko*; Ito, Yuji*; Izuhara, Kenji*; Kuroki, Ryota
Protein Expression and Purification 60(1), p.25-30(2008) ; (JAEA-J 04415)
 The receptor binding to Interleukin (IL)-13 is composed of the IL-13 receptor α1 chain (IL-13R α1) and the IL-4 receptor α chain (IL-4R α). In order to investigate the interaction of IL-13 with IL-13R α1 and IL-4R α, the DNA fragments coding the extracellular regions of human IL-13R α1 and the IL-4R α were fused with mouse Fc and expressed by a silkworm-baculovirus system. The expressed receptors were successfully purified by affinity chromatography using protein A, and the Fc region was removed by thrombin digestion. Size exclusion chromatography and SPR analysis revealed that mixture of IL-13 and IL-13Rα1 showed predominant affinity to IL-4Rα, although neither detectable affinity of IL-13 nor IL-13Rα1 was observed against IL-4Rα. Combining these data with the moderate affinity of IL-13 to IL-13Rα1, this indicates that IL-13 first binds to IL-13Rα1 and recruits consequently to IL-4R.
36001097
Iodine-129 measurements in soil samples from Dolon village near the Semipalatinsk Nuclear Test Site
Endo, Satoru*; Tomita, Jumpei*; Tanaka, Kenichi*; Yamamoto, Masayoshi*; Fukatani, Satoshi*; Imanaka, Tetsuji*; Sakaguchi, Aya*; Amano, Hikaru; Kawamura, Hidehisa*; Kawamura, Hisao*; Apsalikov, K. N.*; Gusev, B. I.*; Whitehead, N. E.*; Shinkarev, S.*; Hoshi, Masaharu*
Radiation and Environmental Biophysics 47(3), p.359-365(2008) ; (JAEA-J 04416)
 Dolon village located about 60 km from the border of the Semipalatinsk Nuclear Test Site is known to be heavily contaminated by the first USSR atomic bomb test in August 1949. Soil samples around Dolon were taken in October 2005 in an attempt to evaluate internal thyroid dose arising from incorporation of radioiodine isotopes (mainly 131I). Iodine-129 in soil was measured by using the technique of Accelerator Mass Spectrometry. From the relationship between 129I and 137Cs (corrected for background and decay from 1949 to 2005) accumulated levels, the background level of 129I and the 129I/137Cs ratio around Dolon were estimated to be (6.4 ±0.4) × 1013 atoms m-2 and 0.25 ±0.16, respectively. This 129I/137Cs ratio is almost similar to the fission yield ratio for 239Pu fast fission (0.24).
36001098
Monte Carlo modelling of Germanium detectors for the measurement of low energy photons in internal dosimetry; Results of an international comparison
Gómez-Ros, J. M.*; de Carlan, L.*; Franck, D.*; Gualdrini, G.*; Lis, M.*; López, M. A.*; Moraleda, M.*; Zankl, M.*; Badal, A.*; Capello, K.*; Cowan, P.*; Ferrari, P.*; Heide, B.*; Henniger, J.*; Hooley, V.*; Hunt, J.*; Kinase, Sakae; Kramer, G. H.*; Löhnert, D.*; Lucas, S.*; Nuttens, V.*; Packer, L. W.*; Reichelt, U.*; Vrba, T.*; Sempau, J.*; Zhang, B.*
Radiation Measurements 43(2-6), p.510-515(2008) ; (JAEA-J 04417)
 This communication summarizes the results concerning the Monte Carlo modeling of Germanium detectors for the measurement of low energy photons arising from the "International comparison on MC modeling for in vivo measurement of Americium in a knee phantom" organized within the EU Coordination Action CONRAD (Coordinated Network for Radiation Dosimetry) as a joint initiative of EURADOS working groups 6 (computational dosimetry) and 7 (internal dosimetry).
36001099
Feasibility study on particle flowability evaluation in simplified MOX pellet fabrication process using vibrating tube method (in Japanese)
Ishii, Katsunori; Suzuki, Masahiro; Yamamoto, Takuma; Kihara, Yoshiyuki; Yasuda, Masatoshi*; Matsusaka, Shuji*
Funtai Kogaku Kaishi 45(5), p.290-296(2008) ; (JAEA-J 04418)
 Particle flowability test using a vibrating tube with a tapered end was carried out to evaluate the applicability of this method to the analysis of MOX particles for nuclear fuel pellet fabrication. In this experiment, zirconia particles were used as model particles, which are less than several hundred micrometers in diameter. The sample particles were prepared by mixing the particles with different sizes, whose shape and surface state were changed by a mechanical treatment. The experimental results showed that the removal of smaller particles is more effective than the mechanical surface treatment to improve the flowability. Furthermore, it was found that the vibrating tube method can identify the difference of the particle flowability more easily and clearly than the method based on Carr's flowability index.
36001100
Thermal histry of the alteration zones around hot springs at Hongu area and Totsukawa area, Southern Kii Peninsula, Southwest Japan (in Japanese)
Hanamuro, Takahiro; Umeda, Koji; Takashima, Isao*; Negishi, Yoshimitsu*
Ganseki Kobutsu Kagaku 37(2), p.27-38(2008) ; (JAEA-J 04419)
 The high temperature hot springs such as in Yunomine and Tosenji and the hydrothermal alteration zones of the Hongu area are distributed in the southern part of Kii peninsula, though no Quaternary volcanoes exist. In this research, it has aimed to understand the heat history that the rocks received by the measurement technique of several dating methods for distributed Hongu area and Totsukawa area in the high temperature hot springs and the alteration zones. As a result of the TL, FT and K-Ar dating, after the activity of the high temperature alteration until tens of millions of years ago, the activity of the relatively low temperature alteration from at least hundreds of thousands of to tens of thousands of years ago in Hongu area and Totsukawa area. These thermal histories can be understood by combining the measurement techniques of several dating methods.
36001101
Production and research development of radioisotope with research and testing reactors of JAEA, 1; The Present condition of supply and future plan (in Japanese)
Kawamura, Hiroshi; Hori, Naohiko
Isotope News (650), p.6-11(2008) ; (JAEA-J 04420)
 
36001102
Supply of radioisotopes and research on radioisotope production using research reactors at Japan Atomic Energy Agency, 2; Research on radioisotope production for cancer therapy (in Japanese)
Hashimoto, Kazuyuki
Isotope News (650), p.11-12(2008) ; (JAEA-J 04421)
 
36001103
Chemical reaction dynamics induced by intense laser fields (in Japanese)
Itakura, Ryuji; Yamanouchi, Kaoru*
Kokagaku 39(1), p.19-26(2008) ; (JAEA-J 04422)
 Researches on photochemical reaction induced by intense laser fields are making progress with advances in laser technology. We describe the following three topics in connection with the advanced laser technologies: (1) controlling the branching ratio between the C-C and C-O bond breaking pathways in the dissociative ionization of ethanol using shaped laser pulses, (2) the influence of the dissociative and rotational motion in course of the double ionization of methanol by changing the pulse duration from few-cycle regime to multi-10 fs regime, (3) application and characterization of attosecond pulses for monitoring the electron dynamics in molecules.
36001104
Thermal-hydraulic estimation in tight-lattice rod bundles for development of the innovative water reactor for flexible fuel cycle (in Japanese)
Kureta, Masatoshi; Yoshida, Hiroyuki; Tamai, Hidesada; Onuki, Akira; Akimoto, Hajime
Konsoryu Kenkyu No Shinten 3, p.99-109(2008) ; (JAEA-J 04423)
 An estimation of void fraction in tight-lattice rod bundles was carried out. Five types of void fraction experiments with 7-, 14-, 19- and 37-rod and rod-gap of 1.0 - 1.3 mm bundle and spacer effect tests were conducted ranging from 0.1 to 7.2 MPa. Extensibility of a TRAC-BF1 code and one-dimensional drift-flux model to the tight-lattice rod bundle was studied. The TRAC-BF1 and the model calculated the void fraction with good agreement to data in case of relatively high quality and void fraction region. Applicability of a NASCA, ACE-3D, TPFIT codes to the tight-lattice rod bundle was verified by comparing with the three-dimensional void fraction data measured by neutron tomography. Tendency of the calculated void fraction by these codes and measured data was similar. Vapor distribution and velocity profile of water and vapor were discussed based on data.
36001105
Utilization of radiation in industrial, agricultural and medical fields and its perspective (in Japanese)
Shibata, Tokushi
Nippon Butsuri Gakkai-Shi 63(4), p.257-264(2008) ; (JAEA-J 04424)
 The current status for the utilization of radiation in Japan was given from the view point of the economic scale. The topics which will be developed in near future such as lithography, radiation processing, radiation analysis in the industry, mutation breeding, sterile insect technique, food irradiation in agriculture, and radiation diagnosis, radiation therapy in medical field were presented. The important techniques for the further development of utilization of radiation will be the techniques related to the fabrication of semiconductor, developments of small accelerators and compact neutron generators.
36001106
Thermomechanical simulation of SiC-block-made sulfuric acid decomposer (in Japanese)
Ishikura, Shuichi; Terada, Atsuhiko; Noguchi, Hiroki; Kasahara, Seiji; Onuki, Kaoru; Hino, Ryutaro
Nippon Genshiryoku Gakkai Wabun Rombunshi 7(2), p.134-141(2008) ; (JAEA-J 04425)
 The Japan Atomic Energy Agency (JAEA) has been conducting R&D on hydrogen production by the thermo-chemical Iodine-Sulfur (IS) process to meet massive hydrogen demand in future hydrogen economy. In the IS process, sulfuric acid (H2SO4) is evaporated and decomposed into H2O and SO3 in a H2SO4 decomposer operated under high temperature condition up to 500°C. We have proposed a new decomposer concept of a block type heat exchanger made of SiC ceramic which has a salient corrosion resistant performance under severe corrosion condition. To verify mechanical feasibility of the concept, temperature distributions of sulfuric acid and helium gas were analyzed with newly coded analytical system applicable to binary mixture such as H2SO4 whose boiling point depends on concentration. Thermo-mechanical simulations with a general-purpose FEM code, which used the heat exchange simulation results, showed that maximum stress generated around the dryout region, which was about half of allowable tensile stress of SiC.
36001107
Study on applicability of numerical simulation to evaluation of gas entrainment due to free surface vortex (in Japanese)
Ito, Kei; Kunugi, Tomoaki*; Oshima, Hiroyuki
Nippon Genshiryoku Gakkai Wabun Rombunshi 7(2), p.152-165(2008) ; (JAEA-J 04426)
 An onset condition of gas entrainment (GE) due to free surface vortex has been studied to establish a design of sodium-cooled fast reactor with higher coolant velocity. Recently, authors are studying the numerical simulation methods to evaluate GE. In this paper, an applicability of the numerical simulation methods to evaluation of the GE is discussed. For that purpose, Quasi-steady vortex and wake vortex were numerically simulated using volume of fluid type two phase flow calculation method. Simulated velocity distributions and free surface shapes of the quasi-steady vortex showed good agreements with experimental results when fine mesh subdivision and high order discretization scheme were employed. The unsteady behavior of the wake vortex was also simulated with high accuracy. Though the onset condition of the GE was slightly underestimated, the applicability of the numerical simulation methods to the GE evaluation was confirmed.
36001108
Proliferation resistance of next generation nuclear energy systems (in Japanese)
Senzaki, Masao; Kuno, Yusuke; Inoue, Naoko; Katsumura, Soichiro
Nippon Genshiryoku Gakkai-Shi 50(6), p.26-31(2008) ; (JAEA-J 04427)
 The major international collaborative projects for Next Generation Nuclear Energy Systems have been started around 2000. Proliferation resistance is one of the development targets as well as economics, safety, and environment. It is especially important for proliferation resistance to build the international consensus. Therefore, it is essential to establish common understanding based on the mutual understanding across the areas of nuclear technology and nonproliferation, domestically and internationally. This paper introduces the discussions and their backgrounds regarding the study of proliferation resistance evaluation methodologies in the past three decades, and identifies the future challenges for nuclear proliferation resistance studies.
36001109
Development of structural reliability evaluation method for aged piping considering uncertainties of seismic motions; How to evaluate the failure probability of aged piping in nuclear power plant due to earthquake (in Japanese)
Ito, Hiroto; Onizawa, Kunio; Sugino, Hideharu*
Nippon Genshiryoku Gakkai-Shi 50(7), p.434-437(2008) ; (JAEA-J 04428)
 Magnitude of seismic motion and degradation such as crack initiation and growth on stress corrosion cracking have uncertainties in the evaluation for the structural integrity of reactor components under seismic motion. We have studied evaluation methods for the structural integrity of components such as piping, i.e. failure probabilities in operation time by probabilistic fracture mechanics (PFM) analysis method which evaluates the uncertainties quantitatively. The evaluation method for seismic motion considering uncertainties, which is most important to evaluate the safety of nuclear power plants under seismic motion, has also been developed. Though their evaluation methods were independent in past, we developed the evaluation method for the failure probabilities considering occurrence probabilities of seismic motion around a plant when seismic motion acts on aged piping by merging them together.
36001110
Corrosion of CrN-coated steels for nuclear reactors in liquid Pb-Bi (in Japanese)
Kurata, Yuji; Futakawa, Masatoshi
Nippon Kinzoku Gakkai-Shi 72(6), p.470-476(2008) ; (JAEA-J 04429)
 Corrosion tests of CrN-coated steels for nuclear reactors were conducted in liquid lead-bismuth (Pb-Bi) at 450°C and 550°C for 3000 h to investigate the applicability of CrN coating to a liquid Pb-Bi environment. CrN coatings on F82H (Fe-8Cr-2W-0.3V-0.04Ta-0.1C) and 316SS exhibited good compatibility in liquid Pb-Bi during corrosion test at 450°C. The CrN coating layer suffered heavy damage such as cracking and spalling, and showed no effectiveness as a protective layer in corrosion test at 550°C. Nickel and chromium in 316SS dissolved into Pb-Bi through the damaged coating layer at 550°C. The cracking and spalling were not found after heating CrN-coated steels in Ar gas at 550°C. It is considered that stresses caused by the difference of thermal expansion coefficients between CrN and steels led to cracking and spalling of the CrN coating through corrosion attack by liquid Pb-Bi at 550°C.
36001111
Effect on positioning accuracy due to assembly error of large robot for ITER blanket maintenance (in Japanese)
Kakudate, Satoshi; Shibanuma, Kiyoshi
Purazuma, Kaku Yugo Gakkai-Shi 84(5), p.269-278(2008) ; (JAEA-J 04431)
 
36001112
Generation of runaway electrons by atmospheric radionuclides in a thunderstorm electric field (in Japanese)
Torii, Tatsuo; Sugita, Takeshi*
Taiki Denki Gakkai-Shi 2(1), p.105-106(2008) ; (JAEA-J 04432)
 The influence of runaway electron generation by atmospheric radionuclides in a thunderstorm electric field is examined. The behavior of radiation emitted by radon, thoron and their decay products in the electric field was analyzed by Monte Carlo calculations. The results showed that a large amount of electron-ion pairs are produced in air when the electric field intensity exceeds 250 kV/m at the altitude of 2 km (about 320 kV/m at the sea-level equivalent pressure). Furthermore, the influence of the resuspension of fallout nuclides was analyzed because lightning activity after the Chernobyl nuclear accident increased in central Sweden where a considerable amount of nuclides fell. It is shown that, similar to natural radioactive nuclides, these nuclides significantly influence the ionization within the thundercloud.
36001113
Introduction to the application program of quantum beam irradiation facility (in Japanese)
Hoto, Mao; Kojima, Takuji
Techno innovation 18(2), p.52-53(2008) ; (JAEA-J 04433)
 
36001114
Bending fatigue strength of surface modified stainless steel with pitting damage (in Japanese)
Naoe, Takashi; Kogawa, Hiroyuki; Wakui, Takashi; Futakawa, Masatoshi; Takeuchi, Hirotsugu*
Zairyo 57(6), p.576-582(2008) ; (JAEA-J 04434)
 A liquid mercury target system for MW-class spallation neutron source is installed in J-PARC. High power proton beams bombard the mercury at 25 Hz, the mercury target vessel suffers the repeated stress due to the pressure waves induced by thermal expansion of the mercury. Cavitation will be generated in the propagation of pressure waves, and pitting damage will be formed on the inner wall of the target vessel by the cavitation bubble collapse. In previous research, it was confirmed that the surface hardening treatment is effective to suppress the pitting damage at some level, although crack and/or separation occurred due to poor interface strength. A novel surface modification technique was developed based on the previous research. The bending fatigue tests on modified stainless steels with pitting damage were performed. As results, damage suppression and fatigue limit improvement due to the modification were confirmed.
36001115
Notes on laser acceleration
Tajima, Toshiki
AIP Conference Proceedings 1024 , p.52-60(2008) ; (JAEA-J 04435)
 
36001116
Introduction of WRF into coupled water cycle model
Nagai, Haruyasu; Tsuzuki, Katsunori; Kobayashi, Takuya
Extended abstract of 9th Annual WRF Users' Workshop (Internet) , 4p.(2008) ; (JAEA-J 04436)
 As a part of construction of numerical simulation system for environmental studies: SPEEDI-MP, coupled water cycle model was developed to simulate mesoscale water and energy circulations. The coupled model consists of the atmosphere, land-surface, hydrology, ocean-wave, and ocean-current models. Calculations of models are carried out as parallel processes and a model coupling program (model coupler) controls these processes and data exchanges among models using Message Passing Interface (MPI). The first version has been constructed with the atmospheric dynamic model MM5, land surface model SOLVEG and hydrology model RIVERS developed at Japan Atomic Energy Agency, ocean-wave model WW3, and ocean-current model POM. The introduction of WRF into this coupled model is currently under way, and coupled calculations using MM5 and WRF are compared.
36001117
An Estimation technique for compositions of bunsen reaction solutions on thermochemical water splitting is process
Kubo, Shinji; Nakajima, Hayato; Imai, Yoshiyuki; Kasahara, Seiji; Tanaka, Nobuyuki; Okuda, Hiroyuki; Miyashita, Reiko*; Onuki, Kaoru
Proceedings of 17th World Hydrogen Energy Conference (WHEC 2008) (CD-ROM) , 4p.(2008) ; (JAEA-J 04437)
 A new technique was developed to estimate compositions of Bunsen reaction solution in liquid-liquid phase separation which was targeted on the two solutions in phase equilibrium. In this technique, just two densities measured in the two solution are employed to estimate compositions of two solutions consisting of HI, H2SO4, I2, H2O. The fundamental equations underlying this estimation is relations between densities and compositions. To formulate the relations, densities of simulated Bunsen reaction solutions were measured and regression expressions were formulated. Moreover, relational equations for both phases were set up from measured values by the regression procedure. Through estimations of both compositions from both densities, the calculated values are approximately consistent with titrated values. Because of easily and simply execution, this technique is useful for practical use, especially for plant operation and equipment design.
36001118
Development of advanced loop-type fast reactor in Japan, 4; An Advanced design of the fuel handling system for the enhanced economic competitiveness
Usui, Shinichi; Mihara, Takatsugu; Obata, Hiroyuki; Kotake, Shoji
Proceedings of 2008 International Congress on Advances in Nuclear Power Plants (ICAPP '08) (CD-ROM) , p.512-518(2008) ; (JAEA-J 04438)
 Refueling operation of sodium fast reactor (SFR) is one of major technical issue due to the chemical activities and opaqueness of sodium coolant properties in comparison with that of LWR. In the Japan Atomic Energy Agency (JAEA) sodium cooled Fast Reactor (JSFR) design study, the further reliable and rational fuel handling system (FHS) has been developing based on the experience of safe and reliable fuel handling operation in the existent SFR plants. Some of advanced concepts for the FHS have being studied in order to increase economic competitiveness further by attempting reduction of the amount of the material and the refueling time, and are scheduled to execute elemental tests and/or mock-up tests to confirm their feasibilities.
36001119
Development of advanced loop-type fast reactor in Japan, 6; Minor actinide containing oxide fuel core design study for the JSFR
Naganuma, Masayuki; Ogawa, Takashi; Oki, Shigeo; Mizuno, Tomoyasu; Kubo, Shigenobu*
Proceedings of 2008 International Congress on Advances in Nuclear Power Plants (ICAPP '08) (CD-ROM) , p.526-535(2008) ; (JAEA-J 04439)
 In FaCT project, sodium-cooled fast reactor with mixed-oxide fuel was selected as the primary candidate. Present study focused on effects of TRU composition on the design of JSFR. In a transitional stage from LWR to FBR, there is possibility for the JSFR fuel to have high MA content due to recycle of LWR spent fuel. That affects core and fuel designs (core reactivity, material property and so on). Thus, to evaluate the effects quantitatively, design studies for the JSFR cores with two TRU compositions were conducted, one was FBR multi-recycle composition with about 1wt% of MA and the other was LWR recycle one, for which 3wt% of MA was assumed as a typical composition. The results showed that the change from FBR multi-recycle composition to LWR recycle one leads to 10% increase of sodium void reactivity, 1-2% decrease of linear power limit and 5% extension of gas plenum length. As a result, effects of TRU composition on the core and fuel designs were indicated to be benign.
36001120
Laser-arc hybrid welding for the cover plate of ITER TF coil
Shiihara, Katsunori*; Makino, Yoshinobu*; Ogawa, Tsuyoshi*; Asai, Satoru*; Kanahara, Toshio*; Senda, Ikuo*; Okuno, Kiyoshi; Koizumi, Norikiyo; Matsui, Kunihiro
Proceedings of 26th International Congress on Applications of Lasers & Electro-Optics (ICALEO 2007) (CD-ROM) , p.316-324(2007) ; (JAEA-J 04440)
 The toroidal field coil is manufactured as one of superconducting coil systems in the ITER. For welding the cover plate of TF coil, the prevention of the thermal effect on the coil and the deformation of the whole coil are required. Moreover, the application of high efficient welding is required in consideration for the productivity. Therefore, laser-arc hybrid welding process was investigated for the application to the cover plate welding, because its process is superior in the tolerance of the joint gap and the ease of the control for the heat input. In the experiment, it was confirmed that the application of laser-arc hybrid welding with the double gas shielding for high concentration arc and the filler wire for controlling the deposit amount is effective in the joint gap up to 0.8mm. Besides, twin spot laser head with the arc was developed in order to weld the both sides of cover plate simultaneously. By the optimization of welding condition for twin spot laser-arc hybrid welding process, it was confirmed to be effective in the prevention of the gap movement during welding and the acquisition of the proper penetration without the weld defect. Finally, the effectiveness of laser-arc hybrid welding for the welding deformation and the weldability on the quality was verified by the scale model test with the actual shape.
36001121
Proposal of a practical guide of convergence measurements in Horonobe Underground Research Laboratory
Tsusaka, Kimikazu; Yamazaki, Masanao; Hatsuyama, Yoshihiro*; Yamamoto, Takuya*
Proceedings of 42nd U.S. Rock Mechanics Symposium and 2nd U.S.-Canada Rock Mechanics Symposium (CD-ROM) , 9p.(2008) ; (JAEA-J 04441)
 The mechanical stability of a tunnel is subject to the development of loosening zone. In tunneling, convergence measurement is the most convenient method to estimate support requirements. In order to predict the final deformation and the development of loosening zone based on the measurement at the earlier stage of excavation work in 12 m span tunnels, one of the authors had proposed the Rock Behavior Classification in Tunneling (RBCT) had been proposed. Japan Atomic Energy Agency has excavated a 4.5 m diameter ventilation and a 6.5 m diameter access shafts in Horonobe, Japan. It is expected to build a practical guide to feed the results from the convergence measurement to the excavation work at deeper stages. Therefore, the authors evaluated the applicability of RBCT by means of analyzing the convergence curves in three tunnels with different dimensions and compared the convergence curves in the shafts with RBCT. As a result, it was clarified that the range of 0.07 to 0.3% in the final deformation ratio and the range of 13 to 15% wide loosening zone in the excavated diameter were estimated when the range of 0.02 to 0.1%/m in the initial deformation ratio was observed.
36001122
Toward an international sparse linear algebra expert system by interconnecting the ITBL Computational Grid with the Grid-TLSE platform
Kushida, Noriyuki; Suzuki, Yoshio; Teshima, Naoya; Nakajima, Norihiro; Caniou, Y.*; Daydé, M.*; Ramet, P.*
Proceedings of 8th International Meeting on High Performance Computing for Computational Science (VECPAR '08) (CD-ROM) , p.424-429(2008) ; (JAEA-J 04442)
 In the present paper, the methodology of interoperability between ITBL and Grid-TLSE is described. Grid-TLSE is an expert website to provides user assistance in choosing the right solver for its problems and appropriate values for the control parameters of the selected solve. The time to solution of linear equation solver strongly depends on the type of problem, the selected algorithm, its implementation and the target computer architecture. Grid-TLSE uses the Diet middle ware to distribute computing tasks over the Grid. Therefore, extending the variety of computer architecture by Grid middle ware interoperability between Diet and ITBL has a beneficial impact to the expert system. To show the feasibility of the methodology, job transfering program as a special service of Diet was developed.
36001123
Integrated framework for simulating behaviors of nuclear power plants under earthquakes
Hazama, Osamu; Kushida, Noriyuki; Matsubara, Hitoshi; Nishida, Akemi; Suzuki, Yoshio; Araya, Fumimasa; Aoyagi, Tetsuo; Nakajima, Norihiro; Kondo, Makoto
Proceedings of 9th MpCCI User Forum , p.118-124(2008) ; (JAEA-J 04443)
 In order to safely and stably supply energy by nuclear means, structural integrity and design standards of the plant including factors such as aging must be confirmed, and its future conditions must be predicted with high reliability. Although full-scale experimentations are favorable for acquiring necessary information and carrying out investigative studies of the nuclear structures, such experiments are for most cases physically and financially impossible. Our objective is to establish an integrated full-scale simulation framework for simulating and quantitatively investing the vibration behavior of nuclear power plant equipments under earthquakes.
36001124
Experimental study on breakup reaction of beryllium and carbon induced with 14-MeV neutrons based on emitted charged-particle measurements
Kondo, Keitaro; Murata, Isao*; Ochiai, Kentaro; Miyamaru, Hiroyuki*; Kubota, Naoyoshi*; Konno, Chikara; Nishitani, Takeo
Proceedings of International Conference on Nuclear Data for Science and Technology (ND 2007), Vol.1 , p.407-410(2008) ; (JAEA-J 04444)
 Beryllium and carbon are candidate materials of fusion reactors and the 9Be(n,2n+2α) and 12C(n,n'+3α) reactions are important from engineering requirements. In order to estimate double-differential cross sections (DDX) for emitted particles, we have to accurately grasp details of the reaction mechanism. Understanding of the reaction mechanism is also interesting from a viewpoint of nuclear physics. Recently we developed a new spectrometry system with a pencil-beam DT neutron source. Using the system, we carried out detailed measurements of DDX for α-particles emitted from beryllium and carbon. The reaction mechanism was investigated by a Monte Carlo calculation of DDX. For the 9Be(n,2n+2α) reaction, the result suggests importance of the contribution from the 9Be(n,α)6He*(Ex≥1.8MeV) reaction. For the 12C(n,n'+3α) reaction, the contribution from the 12C(n,α)9Be*(Ex≥2.43MeV) reaction was appeared and its ratio was investigated to explain the shape of DDX for neutrons in lower energy.
36001125
Measurement of the angle-correlated neutron spectrum for the 9Be(n,2n) reaction with a pencil-beam DT neutron source
Murata, Isao*; Takaki, Satoshi*; Shiken, Kimiaki*; Kondo, Keitaro; Miyamaru, Hiroyuki*; Ochiai, Kentaro; Nishitani, Takeo; Konno, Chikara
Proceedings of International Conference on Nuclear Data for Science and Technology (ND 2007), Vol.2 , p.999-1002(2008) ; (JAEA-J 04445)
 The (n,2n) reaction plays a very important role in the design of fusion reactor. In the present study, using a pencil-beam DT neutron source, angle-correlated two neutrons emitted through (n,2n) reaction have directly been measured to determine (n,2n) reaction cross section with the coincidence detection technique for beryllium which is the most important element in the fusion reactor. In the experiment, two NE213 detectors were arranged very close to the sample to efficiently measure the two neutrons. The measured spectra were unfolded by FORIST with the detector response matrix evaluated by SCINFUL. As a relust, comparing with the evaluations of ENDF/B-VI and JENDL-3.3 for energies above 800 keV of the lower measurable limit energy, the shape of derived angula-differential cross-section fits JENDL-3.3 better than ENDF/B-VI. However, agreement of the cross section of (n,2n) above 800 keV was acceptable within 10 percents for both libraries.
36001126
Radiocarbon-based estimation of soil carbon turnover in a cool-temperate beech forest
Koarashi, Jun; Ando, Mariko; Ishizuka, Shigehiro*; Saito, Takeshi*; Hirai, Keizo*; Miura, Satoru*
Proceedings of International Symposium on Application of a Closed Experimental System to Modeling of 14C Transfer in the Environment , p.72-76(2008) ; (JAEA-J 04446)
 Recent debate has emphasized that our capacity to predict the response of soil organic carbon (SOC) to climate change depends on a clear understanding of the heterogeneity in SOC biodegradability. We collected soil samples from the Appi forest meteorology research site dominated by Japanese beech, separated the soil samples into three SOC fractions with a chemical method, and determined their radiocarbon isotope ratios using an accelerator mass spectrometry. The radiocarbon signatures allow us to estimate their turnover times (TTs), quantifying the rates of SOC decomposition. According to the estimated TTs, the SOC was distinguished into six SOC pools with distinct TTs of several years to > 1000 years. The annual SOC decomposition rate was summed up to 0.47 kgC m-2 y-1, about a half of which was from the fastest-cycling pool (litter). Approximately 5% of SOC gave the over-millennium TTs, suggesting that this pool plays a role of a long-term carbon sequestration in the carbon cycle.
36001127
Investigation on enhancement of reliability for components of reactor system in sodium-cooled fast reactor toward commercialization (in Japanese)
Sakamoto, Yoshihiko; Kubo, Shigenobu*; Kotake, Shoji; Kamishima, Yoshio*
Dai-13-Kai Doryoku, Enerugi Gijutsu Shimpojiumu Koen Rombunshu , p.505-506(2008) ; (JAEA-J 04447)
 This paper describes the enhancement of reliability for components of the reactor system in JSFR design. As for manufacturability, compact design of the RV enables its manufacture in a factory. This results in high quality welding and in precise machining of the RV. The adoption of ring-shaped forgings contributes for securing the reliability against thermal stress as well as securing the dimension precision. Regarding maintenability, the in-vessel structures have simple configurations, so it is comparatively easy for inspection equipments to reach inspection targets. In the JSFR design, sodium boundary area is reduced significantly, which makes double-walled design of the piping easier, and reduces welding lines. So, the reactor system of JSFR is desirable to inspect the in-vessel structures efficiently, and there is a prospect of reliable plant operation. Advanced inspection technologies are also under development for the inspection of the in-vessel structures under sodium.
36001128
MUSIC in DEEP; Multi-monitoring Self Interaction Condition in Data Explorer for Evaluation Processing (in Japanese)
Nakajima, Norihiro; Araya, Fumimasa; Suzuki, Yoshio; Nishida, Akemi; Matsubara, Hitoshi; Nakajima, Kohei
Dai-27-Kai Nippon Shimyureshon Gakkai Taikai Happyo Rombunshu , p.511-514(2008) ; (JAEA-J 04448)
 A real space simulator for vibration table targeted to a nuclear power station has been proposed, which generates over tera-byte amount of calculated result. In order to analyze a huge size data, a data analyzer and data analyzing monitor system is suggested in this paper. A result of finite element analysis is examined by the system taking into account relation among neighboring elements' results. It is operated by multi-monitoring to view analyzing process. The system is implemented on a grid computing environment, AEGIS (atomic energy grid infrastructure) with coupling a large data visualization system.
36001129
Building a computing environment for nuclear material engineering using ITBL (in Japanese)
Tsujita, Yuichi*; Arima, Tatsumi*; Idemitsu, Kazuya*; Suzuki, Yoshio; Kimura, Hideo
Joho Shori Gakkai Kenkyu Hokoku 2008-ARC-177, 2008-HPC-114 , p.103-108(2008) ; (JAEA-J 04449)
 Recently, many research works for Pu-recycle have been done. We proposed a molecular dynamics method to have deep understandings in nuclear materials. We adopted a parallel computing technique by using an ITBL's computing environment in our simulation program because a huge amount of computations and time steps is required. We received a request from application users to incorporate a user friendly interface in a computing environment for specifying parameters in a simulation program and successive operations of parallel computation and visualization on a user's terminal. So, we have built a GUI computing environment to realize such the functionalities by using an ITBL's client API. In this paper, we report objectives of this development, implementation method of this application, and examples of the computing environment. Finally, we mention its future plan.
36001130
Development of the remote inspection equipment for the enriched uranium dissolvers (in Japanese)
Terunuma, Tomohiro; Ozeki, Tatsuya; Fukuari, Yoshihiro
Nippon Hozen Gakkai Dai-5-Kai Gakujutsu Koenkai Yoshishu , p.129-132(2008) ; (JAEA-J 04450)
 The two dissolvers installed in the Tokai reprocessing plant had failed occurred successively in 1982 and 1983. Then, remote-controlled equipment for repair and inspection has been developed because the dissolvers were installed under the high dose of radiation and cannot access easily. After repair of the dissolvers, the periodic inspection by remoteness is periodically carried out once per year for soundness confirmation of the vessels. Moreover, the remote inspection equipment for periodic inspection was developed, which time required for inspection is too short compared with former equipment.
36001131
Development of new three way valve using vacuum for liquid transfer (in Japanese)
Yasuo, Kiyoshi; Seto, Nobuhiko; Watahiki, Seiichi; Fukuari, Yoshihiro
Nippon Hozen Gakkai Dai-5-Kai Gakujutsu Koenkai Yoshishu , p.385-387(2008) ; (JAEA-J 04451)
 The nitric acid solution including nuclear fuel material is transferred by the three way valve called VCV (VCV: vide-casse-vide in Fr.) using vacuum in the Tokai Reprocessing Plant. The reliability of initial three way valve was not obtained because failure occurred by use for one or two years. The cause of failure was damage of the plastic diaphragms in the moving parts. Then, the new three way valve with stainless-steel bellows was developed. there is no failure in moving parts, reliability improved significantly.
36001132
Maintenance activities based on condition monitoring at research reactor "JRR-3" (in Japanese)
Nio, Daisuke; Ota, Kazunori; Ishizaki, Katsuhiko
Nippon Hozen Gakkai Dai-5-Kai Gakujutsu Koenkai Yoshishu , p.393-395(2008) ; (JAEA-J 04452)
 The research reactor JRR-3 was constructed for the purpose of development of nuclear technology and a large scale modification was done. It is necessary to investigate a maintenance methods considering high aging, because more than 15 years has passed from a large modification. In such situation, we should continue condition monitoring method which does not spoil safety and reliability and apply other instruments. So far, monitoring of vibration and lubricating oil has been done, and we might think it appropriate. From now on, we continue investigating that condition monitoring could be applied for other instruments.
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