JAEA Abstracts

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

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

December 2010

38001480
Biological nano-mineralization of Ce phosphate by Saccharomyces cerevisiae
Jiang, M.; Onuki, Toshihiko; Kozai, Naofumi; Tanaka, Kazuya; Suzuki, Yoshinori*; Sakamoto, Fuminori; Kamiishi, Eigo*; Utsunomiya, Satoshi*
Chemical Geology 277(1-2), p.61-69(2010) ; (JAEA-J 08138)

We have investigated the mechanism underlying Ce sequestration by yeast Saccharomyces cerevisiae after exposure to Ce(III) solution at pH 3, 4, or 5. We found that needle-shaped Ce(III) phosphate nanocrystallites with a monazite structure formed on the yeast cells by exposure to Ce(III) for 42 h, even though the initial solutions did not contain any P species. These results suggest that the sorbed Ce on the cell surfaces reacted with P released from inside the yeast cell, resulting in the formation of Ce(III) phosphate nanocrystallites.

38001481
Water transport in polymer electrolyte membranes investigated by dissipative particle dynamics simulation
Sawada, Shinichi; Yamaki, Tetsuya; Ozawa, Taku*; Suzuki, Akihiro*; Terai, Takayuki*; Maekawa, Yasunari
ECS Transactions 33(1), p.1067-1078(2010) ; (JAEA-J 08139)

In order to investigate water transport in polymer electrolyte membranes (PEMs), we calculated the self-diffusion coefficient of water, D_W, by dissipative particle dynamics (DPD) simulation. The simulation target materials are Nafion and radiation-grafted PEMs in the fully-hydrated states. D_W was obtained by the following steps: (1) molecular modeling with the coarse-grained particles representing groups of several atoms; (2) calculation of the water particle diffusivity, D_W^Particle, in the PEMs; (3) determination of the unit time in the DPD simulation; (4) conversion of D_W^Particle of the PEMs into D_W in the standard SI unit. Interestingly, D_W was found to decrease with the diffusion time period, Δt, probably owing to the geometrical confinement effect by water-transport hydrophilic regions. Quantitative analysis of this D_W-Δt relationship provided us with the size of hydrophilic regions.

38001482
Numerical matching scheme for stability analysis of flowing plasmas
Shiraishi, Junya; Tokuda, Shinji*
IEEE Transactions on Plasma Science 38(9), p.2169-2176(2010) ; (JAEA-J 08143)

Numerical implementation and a numerical property of a new matching scheme for stability analysis of flowing plasmas are presented. In the new scheme, the singularities are contained in the inner layer, and the Newcomb equation in the outer regions becomes regular, hence the new scheme is numerically tractable. Also, since the new scheme is based on the boundary layer theory, it can save much computation time.

38001483
Electrical resistivity structure and helium isotopes around Naruko Volcano, northeastern Japan and its implication for the distribution of crustal magma
Asamori, Koichi; Umeda, Koji; Ogawa, Yasuo*; Oikawa, Teruki*
International Journal of Geophysics 2010, 7p.(2010) ; (JAEA-J 08144)

The two-dimensional electrical resistivity structure beneath Naruko Volcano was determined using magnetotelluric soundings. The resulting model shows that a prominent conductor exists in the crust beneath the volcano. The location of the conductor agrees closely with a seismic low-velocity zone. Hypocenters of low-frequency micro-earthquakes are located adjacent to the conductor. The cut-off depth of shallow micro-earthquakes becomes shallow toward the west side of the volcanic center and it is coincident with the upper boundary of the conductor. Furthermore, new helium isotope data from hot springs around the volcano were obtained. The high ³He/⁴He ratios are obtained near the volcano. The maximum ³He/⁴He ratio is located in proximity to this peak and decrease toward away from the volcanic center. This supports the likelihood of mantle-derived materials supplying beneath the volcano. These results indicate that the conductor beneath the volcano is due to high-temperature fluids consisting of magma and related aqueous fluids.

38001484
Local structure of Li-substituted (Bi_0.5Na_0.5)TiO₃
Yoneda, Yasuhiro; Hiruma, Yuji*; Nagata, Hajime*; Takenaka, Tadashi*
Japanese Journal of Applied Physics 49(9), p.09ME09_1-09ME09_4(2010) ; (JAEA-J 08145)

(Ba_0.5Na_0.5)TiO₃ was carried out by a synchrotron radiation X-ray pair-distribution function (PDF) method. The PDF peak is resolved as a doublet owing to the presence of two phases with distinct local structures, those are rhombohedral and tetragonal phases. The dominant rhombohedral phase is stabilized by the Li substitution. The depolarization temperature (T_d) is increased as increasing the rhombohedral component in the local structure.

38001485
Time-resolved X-ray diffraction measurements of high-density InAs quantum dots on Sb/GaAs layers and the suppression of coalescence by Sb-irradiated growth interruption
Kakuda, Naoki*; Kaizu, Toshiyuki*; Takahashi, Masamitsu; Fujikawa, Seiji; Yamaguchi, Koichi*
Japanese Journal of Applied Physics 49(9), p.095602_1-095602_4(2010) ; (JAEA-J 08146)

Self-assembly of high-density InAs quantum dots (QDs) on Sb-irradiated GaAs buffer layers was observed in-situ by a time-resolved X-ray diffraction (XRD) technique using a combination of XRD and molecular beam epitaxy. Evolution of dot height and lattice constant was analyzed during InAs QD growth and subsequent growth interruption (GI), and as a result, dislocated giant dots due to coalescence and coherent dots were separately evaluated. An Sb-irradiated GI (Sb-GI) method to be applied after InAs growth was attempted for the suppression of coalescence. Using this method, the XRD intensity of giant dots decreased, and the photoluminescence intensity of InAs QDs was enhanced. High-density InAs QDs without giant dots were produced by using the combination of the QD growth on the Sb-irradiated GaAs buffer layers and the Sb-GI.

38001486
Development of millimeter-wave planar antennas using low-loss materials
Ito, Naoki*; Mase, Atsushi*; Kogi, Yuichiro*; Seko, Noriaki; Tamada, Masao; Shimazu, Hiroshi*; Sakata, Eiji*
Japanese Journal of Applied Physics 49(10), p.106506_1-106506_5(2010) ; (JAEA-J 08147)

As the importance of advanced millimeter-wave diagnostics increases, the fabrications of high-performance devices and components become essential. This paper describes the development of millimeter-wave planar antennas using low-loss fluorine substrates. The problems to be solved for the present purpose are the low degree of adhesion between copper foil and fluorine substrate and the accuracy of device pattern using conventional fabrication techniques. In order to solve these problems, surface treatment of fluorine films and a fabrication method using Electro-Fine-Forming (EF2) are proposed. In order to confirm the performance of the treated films, microstrip lines (MSL) and the planar patch antennas with low-sidelobe level in E-plane are designed and fabricated on the conventional fluorine substrates and on the grafted-PTFE (Polytetrafluoroethylene) films.

38001487
Chromatography column system with controlled flow and temperature for engineering scale application
Watanabe, So; Goto, Ichiro*; Sano, Yuichi; Koma, Yoshikazu
Journal of Engineering for Gas Turbines and Power 132(10), p.102903_1-102903_7(2010) ; (JAEA-J 08149)

A bench scale extraction chromatography testing system was made. The column of the test system was equipped with ports for 6 external sensors at its top, middle and bottom levels for measuring the flow velocity or temperature, and for additional 6 heaters for simulating the decay heat of Am and Cm at the middle level of the column. The flow velocity distribution was almost constant except for the very near at the column wall, and it was almost uniform when the liquid flew from top to bottom direction with 4 cm/min of the velocity. The heaters scarcely influenced on the temperature profile inside the column when the power applied to the heater simulated the decay heat of Am, Cm and FPs. The decay heat generated in the column was transported to the effluents and the temperature inside column was kept almost constant.

38001488
Proton-induced photoconductivity increment and the thermal stability of a-Si:H thin film
Sato, Shinichiro; Sai, Hitoshi*; Oshima, Takeshi; Imaizumi, Mitsuru*; Shimazaki, Kazunori*; Kondo, Michio*
Journal of Non-Crystalline Solids 356(41-42), p.2114-2119(2010) ; (JAEA-J 08150)

Photoconductivity (PC) variations of device-grade a-Si:H thin films due to proton irradiation are investigated in this paper. We performed in-situ measurements of the PC variations induced by 0.10, 1.0 and 10 MeV proton irradiations. The irradiation initially caused an increase in PC in all sample. However, continued irradiation resulted in a dramatic decrease as the irradiation fluence increased. The results obtained in this study suggest that the PC increment is caused not by accumulation of displacement damage. The results of the temperature dependence of PC for a-Si:H before and after 10 MeV proton irradiation showed that such a proton-induced PC increment consisted of two components: one thermally stable and one metastable. The thermally metastable component disappeared in the temperature region of 300 to 340 K. On the contrary, radiation-induced defects were annealed above 340 K.

38001489
Assessment of FBR MONJU accident management reliability in causing reactor trip
Sotsu, Masutake; Kurisaka, Kenichi
Journal of Nuclear Science and Technology 47(10), p.867-883(2010) ; (JAEA-J 08153)

MONJU is a sodium-cooled, loop-type prototype fast breeder reactor which can supply 280 MW of electricity. The Accident Management (AM) in MONJU is based on three functions: the reactor trip function, the reactor liquid level retaining function, and the decay heat removal function. These are basic safety features, and it is necessary to evaluate the AM capability of these features quantitatively using a PSA technique. This paper describes the AM reactor trip evaluation method comprising plant transient response analysis using the Super-COPD code developed for a best estimate of the plant dynamics of MONJU, the results of this evaluation, and the results of simulator training of plant operators.

38001490
Swelling behaviors in a fuel assembly for the wrapping wire and duct made of modified 316 austenitic stainless steel
Yamagata, Ichiro; Akasaka, Naoaki
Journal of Nuclear Science and Technology 47(10), p.898-907(2010) ; (JAEA-J 08154)

The swelling behaviors in wrapping wire and duct were investigated for a fuel assembly made of modified type 316 austenitic stainless steel irradiated in a fast breeder reactor. The temperature dependence of swelling varied because the peak temperatures of swelling in the wrapping wire and the duct were different. The void distribution in the material was observed by scanning electron microscopy and transmission electron microscopy and it was confirmed that the voids grew within an area of about 100 μm from the surface. This phenomenon seemed to be caused by a surface effect on the neutron-irradiated materials.

38001491
Measurement of atomospheric neutron and photon energy spectra at aviation altitudes using a phoswich-type neutron detector
Takada, Masashi*; Yajima, Kazuaki*; Yasuda, Hiroshi*; Sato, Tatsuhiko; Nakamura, Takashi*
Journal of Nuclear Science and Technology 47(10), p.932-944(2010) ; (JAEA-J 08155)

Neutron energy spectrum from 7 to 180 MeV and photon energy spectrum from 3.5 to 42 MeV were measured on board an aircraft using a newly-developed phoswich-type neutron detector at 10.8 km altitude over Japan. The measured neutron energy spectrum using the phoswich neutron detector was compared with other on-board measurements using a multi-sphere moderator neutron detector, so called Bonner ball and the measurement on the ground using an organic liquid scintillator, and with the calculations using the LUIN2000, EXPACS and RMC codes.

38001492
Behavior of coated fuel particle of High-Temperature Gas-cooled Reactor under reactivity-initiated accident conditions
Umeda, Miki; Sugiyama, Tomoyuki; Nagase, Fumihisa; Fuketa, Toyoshi; Ueta, Shohei; Sawa, Kazuhiro
Journal of Nuclear Science and Technology 47(11), p.991-997(2010) ; (JAEA-J 08156)

In order to clarify the failure mechanism and determine the failure limit of the High Temperature Gas-cooled Reactor (HTGR) fuel under reactivity-initiated accident (RIA) conditions, pulse irradiations were performed with unirradiated coated fuel particles at the Nuclear Safety Research Reactor (NSRR). The energy deposition ranged from 580 to 1,870 J/gUO₂ in the pulse irradiations and the estimated peak temperature at the center of the fuel particle ranged from about 1,510 to 3,950 K. Detailed examinations after the pulse irradiations showed that the coated fuel particles failed above about 1,400 J/gUO₂ where the peak fuel temperature reached over the melting point of UO₂ fuel. It was also shown that the coated fuel particle was failed by the mechanical interaction between the melted and swelled fuel kernel and the coating layer under RIA conditions.

38001493
Calculation of neutron nuclear data on rubidium and strontium isotopes for JENDL-4
Shibata, Keiichi; Ichihara, Akira; Kunieda, Satoshi
Journal of Nuclear Science and Technology 47(11), p.1055-1064(2010) ; (JAEA-J 08157)

Neutron nuclear data on ^85,86,87Rb and ^{84,86,87,88,89,90}Sr have been calculated for the evaluated nuclear data library JENDL-4. Simultaneously calculated are the total, elastic and inelastic scattering, (n,γ), (n,p), (n,d), (n,t), (n,³He), (n,α), (n,np), (n,nd), (n,nα), (n,2n), (n,3n) reaction cross sections, the angular distributions of emitted particles, and the energy distributions of emitted particles and γ-rays. The statistical model was applied to calculate these quantities. Coupled-channel optical model parameters were used for neutrons. Preequilibrium and direct-reaction processes were taken into account in addition to the compound process. The present calculations are consistent with available experimental data. The calculated results are compiled into JENDL-4.

38001494
Local crystal structure of nano-manganese-oxide gold adsorbent
Iikubo, Satoshi*; Koyanaka, Hideki*; Shamoto, Shinichi; Takeuchi, Ken*; Kohara, Shinji*; Kodama, Katsuaki; Loong, C.-K.*
Journal of Physics and Chemistry of Solids 71(11), p.1603-1608(2010) ; (JAEA-J 08158)

The local crystal structure of dried and deuterated nano-manganese-oxide powder samples was studied via atomic pair distribution function analysis of X-ray and neutron powder diffraction data. The protonated sample shows ultrahigh efficiency as a gold adsorbent even from ppt-level aqueous solutions such as seawater. We show that the nano-manganese-oxide particles have an R-MnO₂-type local crystal structure. The possible role of the protons on the surface of the nano-particles is discussed.

38001495
Quantum spin nanotubes; Frustration, competing orders and criticalities
Sakai, Toru; Sato, Masahiro*; Okamoto, Kiyomi*; Okunishi, Koichi*; Itoi, Chigaku*
Journal of Physics; Condensed Matter 22(40), p.403201_1-403201_13(2010) ; (JAEA-J 08159)

Recent developments of theoretical studies on spin nanotubes are reviewed, especially focusing on the S=1/2 three-leg spin tube. In contrast to the three-leg spin ladder, the tube has a spin gap in case of the regular-triangle unit cell when the rung interaction is sufficiently large. The effective theory based on the Hubbard Hamiltonian indicates a quantum phase transition to the gapless spin liquid due to the lattice distortion to an isosceles triangle. This is also supported by the numerical diagonalization and the density matrix renormalization group analyses. Furthermore, combining analytical and numerical approaches, we reveal several novel magnetic-field-induced phenomena: Néel, dimer, chiral and/or inhomogeneous orders, new mechanism for the magnetization plateau formation, and others. The recently synthesized spin tube materials are also briefly introduced.

38001496
Anisotropic transport properties of NpPd₅Al₂
Matsuda, Tatsuma; Haga, Yoshinori; Aoki, Dai*; Homma, Yoshiya*; Tateiwa, Naoyuki; Yamamoto, Etsuji; Onuki, Yoshichika
Journal of Physics; Conference Series 200, p.012113_1-012113_4(2010) ; (JAEA-J 08160)

The anisotropic superconductor NpPd₅Al₂ with ZrNi₂Al₅-type tetragonal structure was studied by means of electrical resistivity and Hall effect in the normal state. The temperature dependence of electrical resistivity ρ(T) shows a large anisotropic behavior. The resistivity for J‖[001] is larger than that for J‖[100] in the whole temperature region. At high temperatures ρ(T) is proportional to − log T, which is characteristic behavior in Kondo effect. The field dependence of Hall resistivity ρ_H shows a linear dependence up to 55 kOe with a large slope for the field. The slope of ρ_H for field along c-axis is negative, but for field along a-axis, the slope dramatically changed from negative to positive with increasing temperature.

38001497
Appropriate pressure-transmitting media for cryogenic experiment in the diamond anvil cell up to 10 GPa
Tateiwa, Naoyuki; Haga, Yoshinori
Journal of Physics; Conference Series 215, p.012178_1-012178_7(2010) ; (JAEA-J 08161)

We evaluated the qualities of pressure-transmitting media by the ruby fluorescence method at room temperature, 77 and 4.2 K in the diamond anvil cell (DAC) up to 10 GPa in order to find appropriate media for the low temperature experiment. Investigations were done on fourteen kinds of media: a 1:1 mixture by volume of Fluorinert FC-70 and FC-77, Daphne 7373 and 7474, NaCl, silicon oil (polydimethylsiloxane), vaselin, 2-propanol, glycerin, a 1:1 mixture by volume of n-pentane and isopentane, a 4:1 mixture by volume of methanol and ethanol, petroleum ether, nitrogen, argon and helium. We discuss the non-hydrostatic effects of the pressure in the media from the broadening effect of the ruby R₁ fluorescence line. The media are classified into three groups (I, II and III) from the values of ΔFWHM at 5 GPa and 77 K: a relative increase of the width of the ruby R₁ line to the ambient value.

38001498
Certificated reference material IAEA-418; ¹²⁹I in mediterranean sea water
Pham, M. K.*; Betti, M.*; Povinec, P. P.*; Alfimov, V.*; Biddulph, D.*; Gastaud, J.*; Kieser, W. E.*; López, Gutiérrez, J. M.*; Possnert, G.*; Sanchez-Cabeza, J. A.*; Suzuki, Takashi
Journal of Radioanalytical and Nuclear Chemistry 286(1), p.121-127(2010) ; (JAEA-J 08162)

38001499
Status report of J-PARC
Ouchi, Nobuo
Journal of the Korean Physical Society 56(6), p.1921-1927(2010) ; (JAEA-J 08163)

Japan Proton Accelerator Research Complex (J-PARC) is in phase-I now, which consists of three accelerators; a linac, a 3-GeV rapid cycling synchrotron (RCS), and a 50-GeV main ring synchrotron (MR), and three experimental facilities; Materials and Life Science Experimental Facility (MLF), Hadron Experimental Facility, and Neutrino Experimental Facility. After the beam commissioning of RCS, the first beam injection, circulation and acceleration to 30 GeV in MR, and the first neutron and muon generation in MLF were successfully performed in 2008. User operation of MLF was also started in December, 2008. In addition, high beam power demonstrations were performed at RCS; 322 kW-equivalent power in single shot operation. In 2009, the first beams were injected from MR to both Hadron Experimental Facility and Neutrino Experimental Facility. Therefore, proton beams have reached to all experimental facilities up to now. Resent progress of J-PARC in 2008 and 2009 will be presented.

38001500
Eestimation of production yield of ⁹⁹Mo for medical use using neutrons from ^natC(d,n) at E_d = 40 MeV
Minato, Futoshi; Nagai, Yasuki
Journal of the Physical Society of Japan 79(9), p.093201_1-093201_3(2010) ; (JAEA-J 08164)

We have estimated the production yield of ⁹⁹Mo by ¹⁰⁰Mo(n,2n)⁹⁹Mo using neutrons produced by bombarding a natural carbon target ^natC with 40 MeV 5mA deuterons. We used the latest data on angular and energy distributions of neutrons from ^natC(d,n) and the evaluated cross section of ¹⁰⁰Mo(n,2n)⁹⁹Mo given in the Japanese Evaluated Nuclear Data Library to estimate the ⁹⁹Mo yield. The ⁹⁹Mo yield was given with a different distance between a carbon target position and a ¹⁰⁰Mo sample position, and with a different ¹⁰⁰Mo sample radius and thickness. We obtained typically 7.1 TBq activity of ⁹⁹Mo at the end of neutron irradiation for two days for a ¹⁰⁰Mo sample (250 g).

38001501
Fermi surface properties of ferromagnet UCu₂Si₂
Matsuda, Tatsuma; Ikeda, Shugo*; Yamamoto, Etsuji; Haga, Yoshinori; Shishido, Hiroaki*; Yamagami, Hiroshi; Settai, Rikio*; Onuki, Yoshichika
Journal of the Physical Society of Japan 79(11), p.114712_1-114712_4(2010) ; (JAEA-J 08165)

We have succeeded in growing a high-quality single crystal of UCu₂Si₂ with the tetragonal structure by the Sn-flux method and measured the de Haas-van Alphen effect. UCu₂Si₂ orders antiferromagnetically below T_N = 106 K, and follows a successive ferromagnetic ordering at T_C = 100 K. Several de Haas-van Alphen branches are observed in the ferromagnetic state, ranging from 5×10⁶ to 7×10⁷ Oe. The corresponding cyclotron effective masses are moderately large, ranging from 1.4 to 4.2 m₀, consistent with the electronic specific heat coefficient γ = 20 mJ/K²·mol. These experimental results are approximately explained by the 5f-itinerant spin- and orbital-polarized energy band model.

38001502
Enhanced micronucleus formation in the descendants of γ-ray-irradiated tobacco cells; Evidence for radiation-induced genomic instability in plant cells
Yokota, Yuichiro; Funayama, Tomoo; Hase, Yoshihiro; Hamada, Nobuyuki*; Kobayashi, Yasuhiko; Tanaka, Atsushi; Narumi, Issei
Mutation Research; Fundamental and Molecular Mechanisms of Mutagenesis 691(1-2), p.41-46(2010) ; (JAEA-J 08166)

Ionizing radiation-induced genomic instability has been documented in various end points such as chromosomal aberrations and mutations, which arises in the descendants of irradiated mammalian or yeast cells many generations after the initial insult. This study aimed at addressing radiation-induced genomic instability in higher plant tobacco cells. We thus investigated micronucleus (MN) formation and cell proliferation in tobacco cells irradiated with γ-rays and their descendants. The descendants that have undergone at least 22 generations after irradiation still showed a two-fold MN frequency compared to sham-irradiated cells. This is the direct evidence for radiation-induced genomic instability in tobacco cells.

38001503
Experimental study on fluid mixing phenomena in T-pipe junction with upstream elbow
Kimura, Nobuyuki; Ogawa, Hiroshi*; Kamide, Hideki
Nuclear Engineering and Design 240(10), p.3055-3066(2010) ; (JAEA-J 08167)

Temperature fluctuation in fluid causes high cycle thermal fatigue in structure materials according to temperature distributions and time variations. A mixing tee is one of typical geometries where temperature fluctuation occurs. In the nuclear reactors and general plants, an elbow is often used near the mixing tee and it brings biased velocity distribution and also the secondary flow. In this study, influences of upstream elbow in the main pipe were studied in a water experiment of mixing tee with the elbow. The temperature fluctuation at the mixing tee with the upstream elbow had the large component at low frequency in comparison with the straight case. The effect of the upstream elbow is significant to evaluate the high cycle thermal fatigue in the mixing tee because of larger importance of low frequency fluctuation on the point of fluid temperature-stress conversion.

38001504
Energetic particle driven instability in wall-stabilized high-β plasmas
Matsunaga, Go; Shinohara, Koji; Aiba, Nobuyuki; Sakamoto, Yoshiteru; Isayama, Akihiko; Asakura, Nobuyuki; Suzuki, Takahiro; Takechi, Manabu; Oyama, Naoyuki; Urano, Hajime; JT-60 Team
Nuclear Fusion 50(8), p.084003_1-084003_8(2010) ; (JAEA-J 08168)

We have observed a fishbone like bursting mode in high-β plasmas above the ideal β-limit without a conducting wall. The mode frequency is chirping down, and its initial value is close to precession frequency of trapped fast ions produced by perpendicularly injected neutral beams. This mode can often induce the resistive wall mode (RWM) onset. The mode is mainly observed in the high-β_N plasma where ideal kink-ballooning mode (IKBM) and RWM are marginally stable. Since this mode and RWM were simultaneously observed, the mode is attributed to the interaction between the trapped fast ions and a marginally stable IKBM stabilized by conducting wall. From these results, the observed mode was named as "Energetic particle driven Wall Mode (EWM)." Interestingly, the EWM can change edge localized mode (ELM) behavior. Namely, it was observed that ELM was synchronized with the EWM.

38001505
Comparison of secondary ion emission yields for poly-tyrosine between cluster and heavy ion impacts
Hirata, Koichi*; Saito, Yuichi; Chiba, Atsuya; Yamada, Keisuke; Takahashi, Yasuyuki; Narumi, Kazumasa
Nuclear Instruments and Methods in Physics Research B 268(19), p.2930-2932(2010) ; (JAEA-J 08169)

Emission yields of secondary ions necessary for the identification of poly-tyrosine were compared for incident ion impacts of energetic cluster ions (0.8 MeV C₈⁺, 2.4 MeV C₈⁺, and 4.0 MeV C₈⁺) and swift heavy monoatomic molybdenum ions (4.0 MeV Mo⁺ and 14 MeV Mo⁴⁺) with similar mass to that of the cluster by time-of-flight secondary ion mass analysis combined with secondary ion electric current measurements. The comparison revealed that (1) secondary ion emission yields per C₈⁺ impact increase with increasing incident energy within the energy range examined, (2) the 4.0 MeV C₈⁺ impact provides higher emission yields than the impact of the monoatomic Mo ion with the same incident energy (4.0 MeV Mo⁺), and (3) the 2.4 MeV C₈⁺ impact exhibits comparable emission yields to that for the Mo ion impact with higher incident energy (14 MeV Mo⁴⁺). Energetic cluster ion impacts effectively produce the characteristic secondary ions for poly-tyrosine, which is advantageous for highly sensitive amino acid detection in proteins using time-of-flight secondary ion mass analysis.

38001506
Binomial distribution function for intuitive understanding of fluence dependence of non-amorphized ion-track area
Ishikawa, Norito; Ohara, Kota; Ota, Yasuyuki*; Michikami, Osamu*
Nuclear Instruments and Methods in Physics Research B 268(19), p.3273-3276(2010) ; (JAEA-J 08170)

In this experiment, CeO₂ thin films are irradiated with 200 MeV Au to investigate the damage created by electronic energy deposition. The damage is studied by Raman spectroscopy.

38001507
Exotic superconducting state embedded in the hidden order state of URu₂Si₂
Matsuda, Yuji*; Okazaki, Ryuji*; Kasahara, Yuichi*; Shishido, Hiroaki*; Shibauchi, Takasada*; Haga, Yoshinori; Matsuda, Tatsuma; Onuki, Yoshichika
Physica C 470(20), p.1013-1017(2010) ; (JAEA-J 08171)

We report charge and thermal transport measurements on ultra clean single crystals of the superconductor with the hidden-order state URu₂Si₂. The results provide strong evidence for a new type of unconventional superconductivity with two distinct gaps having different nodal topology. We propose a gap function with chiral d-wave form. We also demonstrate that a distinct flux line lattice melting transition with outstanding characters occurs well below the upper critical fields even at sub-Kelvin temperature.

38001508
Fermi surface properties of YbCu₂Si₂
Matsuda, Tatsuma; Dung, N. D.*; Haga, Yoshinori; Ikeda, Shugo*; Yamamoto, Etsuji; Ishikura, Tatsuro*; Endo, Toyoaki*; Takeuchi, Tetsuya*; Settai, Rikio*; Onuki, Yoshichika
Physica Status Solidi (B) 247(3), p.757-759(2010) ; (JAEA-J 08172)

We succeeded in growing high-quality single crystals of a heavy electron compound YbCu₂Si₂. The electronic specific heat coefficient γ is determined to be 150 mJ/K²·mol, which is consistent with the A value of the electrical resistivity from Kadowaki-Woods relation. We succeeded in observing the de Haas-van Alphen (dHvA) oscillations. The dHvA frequencies and large cyclotron effective masses in YbCu₂Si₂ are highly different from those in a non-4f reference compound YCu₂Si₂. From these dHvA results, the heavy electron state of YbCu₂Si₂ is characterized by the large contribution of 4f-electrons to the volume of the Fermi surface and also to the strong enhancement of effective mass caused by the spin fluctuations.

38001509
Energy scale of the electron-boson spectral function and superconductivity in NpPd₅Al₂
Ummarino, G. A.*; Caciuffo, R.*; Chudo, Hiroyuki; Kambe, Shinsaku
Physical Review B 82(10), p.104510_1-104510_7(2010) ; (JAEA-J 08173)

The energy scale Ω₀ of the electron-boson spectral function in the heavy-fermion, d-wave superconductor NpPd₅Al₂ is predicted on the basis of Eliashberg theory calculations. Assuming a spectral function shape typical for antiferromagnetic spin fluctuations, and imposing constraints provided by the experimental values for the critical temperature and the low-temperature energy gap, one obtains values of Ω₀ of about 2-2.5 meV, slightly dependent from the strength of the Coulomb pseudopotential. These values are in excellent agreement with the characteristic magnetic fluctuations energy estimated from NMR measurements of the nuclear-spin-lattice relaxation time at the Al site. The calculated temperature dependence of the upper critical field, the local spin susceptibility, and the nuclear spin-lattice relaxation rate is also in good agreement with available experimental data.

38001510
Impurity scattering rate and coherence factor in vortex core of sign-reversing s-wave superconductors
Nagai, Yuki; Kato, Yusuke*
Physical Review B 82(17), p.174507_1-174507_12(2010) ; (JAEA-J 08174)

We investigate the impurity scattering rates for quasi-particles in vortex cores of sign-reversing s-wave superconductors as a probe to detect the internal phase difference of the order parameters. The impurity scattering rates can be detected as a quasiparticle interference effect (QPI) by the scanning tunneling microscopy and spectroscopy (STM/STS) technique. With use of the Born and Kramer-Pesch approximations for Andreev bound states, we show that the sign-reversed forward scatterings are dominant in vortex cores. Owing to the coherence factor in vortex cores of ± s-wave superconductors, the impurity scattering rate of the Andreev bound states has a characteristic distribution on the Fermi surfaces. For comparison, the impurity scattering rates in vortex cores of s-wave and d-wave superconductors are also discussed.

38001511
Cross-shell excitations near the "island of inversion"; Structure of ³⁰Mg
Daecon, A. N.*; Smith, J. F.*; Freeman, S. J.*; Janssens, R. V. F.*; Carpenter, M. P.*; Hadinia, B.*; Hoffman, C. R.*; Kay, B. P.*; Lauritsen, T.*; Lister, C. J.*; O'Donnell, D.*; Ollier, J.*; Otsuka, Takaharu*; Seweryniak, D.*; Spohr, K.-M.*; Steppenbeck, D.*; Tabor, S. L.*; Tripathi, V.*; Utsuno, Yutaka; Wady, P. T.*; Zhu, S.*
Physical Review C 82(3), p.034305_1-034305_7(2010) ; (JAEA-J 08175)

38001512
Neutrino reactions on ¹³⁸La and ¹⁸⁰Ta via charged and neutral currents by the quasiparticle random-phase approximation
Cheoun, M.-K.*; Ha, E.*; Hayakawa, Takehito; Kajino, Toshitaka*; Chiba, Satoshi
Physical Review C 82(3), p.035504_1-035504_7(2010) ; (JAEA-J 08176)

We investigate neutrino-induced reactions on heavy nuclei. Charged current (CC) reactions,¹³⁸Ba(ν_e, e^-)¹³⁸La and ¹⁸⁰Hf(ν_e, e^-)¹⁸⁰Ta are calculated by a quasi-particle random phase approximation (QRPA) with pairing correlations. For neutral current (NC) reactions, ¹³⁹La(ν,ν')¹³⁹La^* and ¹⁸¹Ta(ν,ν')¹⁸¹Ta^*, we generate ground and excited states of odd-even target nuclei, ¹³⁹La and ¹⁸¹Ta, by operating one quasi-particle to even-even nuclei. Numerical results for CC reactions are shown to be consistent with recent semi-empirical data deduced from the Gamow-Teller strength distributions measured in the (³He,t) reaction. Results for NC reactions are estimated to be smaller by a factor about 4 to 5 rather than those by CC reactions. Finally, cross sections weighted by the incident neutrino flux in the core collapsing supernova are presented for further applications to the network calculations for relevant nuclear abundances.

38001513
Quantum renormalization of the spin hall effect
Gu, B.; Gan, J.-Y.*; Bulut, N.*; Ziman, T.*; Guo, G.-Y.*; Nagaosa, Naoto*; Maekawa, Sadamichi
Physical Review Letters 105(8), p.086401_1-086401_4(2010) ; (JAEA-J 08177)

By quantum Monte Carlo simulation of a realistic multi-orbital Anderson impurity model, we have studied the spin-orbit interaction (SOI) of an Fe impurity in Au host metal. We have shown, for the first time, that the SOI is strongly renormalized by the quantum spin fluctuation. Based on this mechanism, we could explain why the gigantic spin hall effect in Au with Fe impurities was observed in recent experiment, while it is not visible in the anomalous hall effect. In addition, we have shown that the SOI is strongly renormalized by the coulomb correlation U. Based on this picture, we could explain past discrepancies in the calculated orbital angular momenta for an Fe impurity in Au host.

38001514
Observation of magnetized soliton remnants in the wake of intense laser pulse propagation through plasmas
Romagnani, L.*; Bigongiari, A.*; Kar, S.*; Bulanov, S. V.; Cecchetti, C. A.*; Esirkepov, T. Z.; Galimberti, M.*; Jung, R.*; Liseykina, T. V.*; Osterholz, J.*; Pegoraro, F.*; Willi, O.*; Borghesi, M.*
Physical Review Letters 105(17), p.175002_1-175002_4(2010) ; (JAEA-J 08178)

Slowly evolving, regularly spaced patterns have been observed in proton projection images of plasma channels drilled by intense laser pulses propagating in an ionized gas jet. The analysis suggests the formation of rows of magnetized soliton remnants, with a quasistatic magnetic field associated with vortex like electron currents resembling those of magnetic vortices.

38001515
Superdeformation in asymmetric N>Z nucleus ⁴⁰Ar
Ideguchi, Eiji*; Ota, Shinsuke*; Morikawa, Tsuneyasu*; Oshima, Masumi; Koizumi, Mitsuo; Toh, Yosuke; Kimura, Atsushi; Harada, Hideo; Furutaka, Kazuyoshi; Nakamura, Shoji; Kitatani, Fumito; Hatsukawa, Yuichi; Shizuma, Toshiyuki; Sugawara, Masahiko*; Miyatake, Hiroari; Watanabe, Yutaka*; Hirayama, Yoshikazu*; Oi, Makito*
Physics Letters B 686(1), p.18-22(2010) ; (JAEA-J 08179)

A rotational band with five γ-ray transitions ranging from 2⁺ to 12⁺ states was identified in ⁴⁰Ar. The deduced transition quadrupole moment of 1.45 ±0.15 eb indicates that the band has a superdeformed shape. The nature of the band is revealed by cranked Hartee Fock Bogoliubov calculations and a multiparticle-multihole configuration is assigned to the band.

38001516
Correlation between laser accelerated MeV proton and electron beams using simple fluid model for target normal sheath acceleration
Tampo, Motonobu; Awano, Shinya*; Bolton, P.; Kondo, Kiminori; Mima, Kunioki*; Mori, Yoshitaka*; Nakamura, Hirotaka*; Nakatsutsumi, Motoaki*; Stephens, R. B.*; Tanaka, Kazuo*; Tanimoto, Tsuyoshi*; Yabuuchi, Toshinori*; Kodama, Ryosuke*
Physics of Plasmas 17(7), p.073110_1-073110_5(2010) ; (JAEA-J 08180)

High density energetic electrons that are created by intense laser plasma interactions drive MeV proton acceleration. Correlations between accelerated MeV protons and electrons are experimentally investigated at laser intensities in the range, 10¹⁸ - 10¹⁹ W/cm² with S-polarization. Observed proton maximum energies are linearly proportional to the electron slope temperatures with a scaling coefficient of about 10. Experimental results also indicate that, in the context of the simple analytical fluid model for transverse normal sheath acceleration, the ion (proton) density is comparable to density of the hot electron cloud near the target rear surface if an empirical acceleration time is assumed.

38001517
Wave-action conservation law for eigenmodes and continuum modes
Hirota, Makoto; Tokuda, Shinji*
Physics of Plasmas 17(8), p.082109_1-082109_11(2010) ; (JAEA-J 08181)

Invariance of wave action for eigenmodes and continuum modes around quasi-stationary equilibrium state is investigated in a general framework that allows for the ideal magnetohydrodynamic system and the Vlasov-Maxwell system. By utilizing the averaging method for the variational principle, the wave action of each mode is shown to be conserved if its frequency (spectrum) is sufficiently separated from other ones, whereas some conservative exchange of the wave action may occur among the modes with close frequencies. This general conservation law is, as an example, demonstrated for a situation where the Landau damping (or growth) occurs due to a resonance between an eigenmode and a continuum mode. The damping (or growth) rate is closely related to the spectral linewidth (= the phase mixing rate) of the continuum mode, which can be estimated by the invariance of wave action without invoking the conventional analytic continuation of the dispersion relation.

38001518
Interaction of high contrast laser pulse with foam-attached target
Nakamura, Tatsufumi; Tampo, Motonobu; Kodama, Ryosuke*; Bulanov, S. V.; Kando, Masaki
Physics of Plasmas 17(11), p.113107_1-113107_6(2010) ; (JAEA-J 08182)

Interactions of high contrast laser pulses with foam-attached targets are investigated via Particle-in-Cell (PIC) simulations in order to enhance the energy coupling from laser to plasmas. A foam layer whose mass density is much lower than that of the solid state is used for controlling the plasma density distribution of the laser irradiation region with the aid of the high contrast laser pulses. The ionization process plays a role in the laser and foam interaction, which results in the formation of periodic structure of ion charge density. The bulk electrons inside the foam layer are heated by the laser pulse, which results in the generation of abundant MeV electrons and higher energy coupling from laser to plasma. These features are utilized for laser ion acceleration by using a foam-attached thin foil target. It is shown that the laser accelerated ion energy is enhanced by properly choosing the foam parameters.

38001519
Spatial distribution of Δ¹⁴C values of organic matter in surface sediments off Saru River in northern Japan, one year after a flood event in 2006
Nagao, Seiya*; Irino, Tomohisa*; Aramaki, Takafumi*; Ikehara, Ken*; Katayama, Hajime*; Otosaka, Shigeyoshi; Uchida, Masao*; Shibata, Yasuyuki*
Radiocarbon 52(3), p.1068-1077(2010) ; (JAEA-J 08183)

This study discusses the effects of flooding on the spatial distribution of organic matter on the shelf region of off the Saru River, southern part of Hokkaido, Japan, on the basis of the Δ¹⁴C and δ¹³C values. Surface sediments on the shelf were collected in August 2007, one year after the severe flood in 2006. Suspended particles and sediment of the Saru River were also collected in August 2007 and 2008. The Δ¹⁴C values of organic matter in the shelf sediments ranged from -665 to -77 per mil. The silt and clay sediments had Δ¹⁴C values of -240 to -77 per mil, but the sandy sediments ranged from -665 to -388 per mil. The Δ values of particulate organic carbon in the Saru River are -292 to -247 per mil at normal flow conditions. These results indicate that surface soil with relatively older organic matter is deposited on the shelf region by the flooding event, and freshly-produced organic matter in sea surface is deposited after the flooding.

38001520
Decolorization of secondary treated water from livestock urine waste
Takigami, Machiko*; Nagasawa, Naotsugu; Hiroki, Akihiro; Kasai, Noboru; Yoshii, Fumio; Tamada, Masao; Takigami, Shoji*; Shibata, Takuya*; Aketagawa, Yasushi*; Ozaki, Masuo*
Transactions of the Materials Research Society of Japan 35(3), p.647-650(2010) ; (JAEA-J 08184)

There are many livestock farmers in Gunma Prefecture. Many of the farms are located under Mt. Akagi and Haruna, which attract tourists. Furthermore, rivers around the mountains are source of water supply to metropolitan area. Therefore, the waste treatments are very important. Regulations of smell and COD (chemical oxygen demand) are severe in Gunma Prefecture. Although there is no regulation for color of drain water, color in secondary treated water from livestock urine waste has been one of the major concerns for livestock farmers. The color is a metabolite of microorganisms and not easy to be removed. People have tried to remove the color by ozone treatment, absorption using activated carbon or soils. An absorbent was prepared by radiation grafting; fibers were irradiated with ⁶⁰Co γ-rays and some kinds of monomers were grafted onto the fibers. The absorbent thus prepared were used to decolorize the secondary treated water. The color and COD were removed by the absorbent, however, COD removal was more difficult than decolorization. Degree of grafting (weight increase expressed in % by grafting reaction to initial weight of the fiber), treated water/absorbent ratio, flow rate of treated water, and direction of flow affected color and COD removal. The used absorbent could be used repeatedly after washing.

38001521
Plutonium analysis by on-line sequential injection system (in Japanese)
Yamamoto, Masahiko
Bunseki 2010(10), p.546(2010) ; (JAEA-J 08185)

38001522
Case study for one-piece removal method of reactor vessel of nuclear ship "Mutsu" (in Japanese)
Nagane, Satoru; Kitahara, Katsumi; Yoshikawa, Seiji; Miyasaka, Yasuhiko*; Fukumura, Nobuo*; Nishizawa, Ichio*
Dekomisshoningu Giho (42), p.2-10(2010) ; (JAEA-J 08186)

A reactor installed at the center part of the nuclear ship "Mutsu" has been stored safely and exhibited in a reactor room building since 1996. The reactor vessel and its internals are key components because of main radioactive wastes for the reasonable decommissioning plan in the future. This report describes the one-piece removal method as the one package of the reactor vessel with its internals intact with a shipping container or additional shields. The reactor vessel package (Max. 100 ton) will be classified acceptable for burial at the low level radioactive waste (LLW), which will be buried at a LLW pit facility under waste disposal regulations. And also, the package will be classified as an IP-2-equivalent package according to the requirement for Shipments and Packagings.

38001523
Development of laser plasma X-ray microbeam irradiation system and radiation biological application (in Japanese)
Sato, Katsutoshi; Nishikino, Masaharu; Numasaki, Hodaka*; Kawachi, Tetsuya; Teshima, Teruki*; Nishimura, Hiroaki*
Denki Gakkai Rombunshi, C 130(10), p.1800-1805(2010) ; (JAEA-J 08187)

38001524
Thermal degradation analysis of deuterium-ion-implanted V₂₅Cr₄₀Ti₃₅ using synchrotron radiation photoelectron spectroscopy (in Japanese)
Tode, Mayumi; Harries, J.; Teraoka, Yuden; Yoshigoe, Akitaka
Denki Gakkai Rombunshi, C 130(10), p.1819-1820(2010) ; (JAEA-J 08188)

In order to study the thermal degradation process of the hydrogen storage materials surface layer and the thermal desorption of hydrogen property, we have used high-resolution synchrotron radiation X-ray photoelectron spectroscopy. The experiments were performed at the JAEA soft X-ray beamline BL23SU at SPring-8, using the "SUREAC2000" surface reaction analysis apparatus. Spectra were recorded for two samples (V₂₅Cr₄₀Ti₃₅) covered with native oxide layers, one of which was implanted with deuterium ions. For the un-implanted sample, the oxide layer changes dramatically between 373 K and 473 K, for the deuterium-implanted sample, the change occurs between 473 K and 573 K. The implantation of deuterium leads to a stabilization (of approximately 100 K) of the surface oxide layer.

38001525
J-PARC linac (in Japanese)
Hasegawa, Kazuo
Denki Gakkai-Shi 130(11), p.739-741(2010) ; (JAEA-J 08189)

38001526
What is decommissioning of nuclear facilities?; Technology necessary for decommissioning (in Japanese)
Yanagihara, Satoshi
Enerugi Rebyu 30(10), p.54-55(2010) ; (JAEA-J 08190)

Decommissioning work is conducted by using various technologies. In the decommissioning process, it should be necessary to consider safety of public and workers from radiological and industrial aspects, and that lowing environmental burden by minimizing radioactive waste arising as well as optimizing decommissioning costs by rational implementation of the practices. The technology necessary for decommissioning are roughly grouped into the areas such as facility characterization, dismantling, decontamination, radioactive waste treatment/disposal. In addition, project management including decommissioning planning where project parameters are evaluated in terms of resource, costs, schedule, risk, etc. This article will describe the technologies mentioned above briefly.

38001527
Estimation of ²²²Rn flux and its effect on the atmospheric ²²²Rn concentration at Hachijo-jima island, Japan (in Japanese)
Okura, Takehisa; Yamazawa, Hiromi*; Moriizumi, Jun*; Hirao, Shigekazu*; Iida, Takao*
Hoken Butsuri 45(3), p.270-277(2010) ; (JAEA-J 08193)

Measurements of ²²²Rn flux from the ground and ²²⁶Ra content in soil were made on Hachijo-jima, which is a solitary island in the Pacific about 200 km to the south of the main island of Japan, to evaluate effect of locally exhaled ²²²Rn to the surface air concentration of ²²²Rn measured on this island. Averages of ²²²Rn flux and ²²⁶Ra content in dry soil were 0.88 mBq m^-2 s^-1 and 6.8 Bq kg^-1 at Hachijo-jima and 9.7 mBq m^-2 s^-1 and 23.2 Bq kg^-1 at Nagoya, respectively. The low level ²²⁶Ra content in soil is one of main causes for the small ²²²Rn flux at the island. With this ²²²Rn flux, the contribution of locally exhaled ²²²Rn from the island was estimated by a simple model to occur at concentration of 0.035 to 0.072 Bq m^-3 (relative contribution is 4 to 12%) under typical nocturnal condition. Under diurnal condition effect is lower than that of nocturnal condition. This local ²²²Rn component is negligible as compared with concentration of long-range transported ²²²Rn of 0.5 to 3 Bq m^-3.

38001528
Recovery application of rare metal by graft adsorbent (in Japanese)
Seko, Noriaki
Isotope News (678), p.6-9(2010) ; (JAEA-J 08195)

38001529
Panel discussion, 3; Current status and future perspective of mutation breeding using radiation (in Japanese)
Narumi, Issei
Isotope News (678), p.20-21(2010) ; (JAEA-J 08196)

38001530
Current states and a short history of grey literature; Focusing on the International Conference on Grey Literature (in Japanese)
Ikeda, Kiyoshi
Joho Kanri 53(8), p.428-440(2010) ; (JAEA-J 08197)

38001531
Nuclear fusion reactor (in Japanese)
Tobita, Kenji
Karyoku Genshiryoku Hatsuden 61(10), p.1026-1031(2010) ; (JAEA-J 08198)

Recent development of fusion reactor technology in Japan is summarized. ITER is a fusion experimental reactor that will play a central role in fusion reactor development in near future. Plasma technology has been focused on exploitation of the ITER operation basis. Long sustainment of high normalized beta discharges performed in JT-60U is a good example of research contributing to ITER. As to fusion engineering, there was remarkable progress in the manufacturing methods of superconducting magnets, and in a high (1 MW), efficient (55%) and long (800 seconds) power generation of 170 GHz radio-frequency waves, which would also contribute to the construction of ITER. The article contains an overview of the Broader Approach program which has been carried out in parallel with the ITER project, as well.

38001532
High-temperature gas-cooled reactor (in Japanese)
Hino, Ryutaro; Ogawa, Masuro
Karyoku Genshiryoku Hatsuden 61(10), p.1032-1037(2010) ; (JAEA-J 08199)

The goal of broadening industrial applications of nuclear energy while significantly cutting CO₂ emission can be achieved with the near-term deployable, passively-safe high-temperature gas-cooled reactors (HTGRs), which can supply heat of high-temperatures of up to 950°C to a wide range of industrial plants for CO₂-free hydrogen production, power generation, etc. This paper introduces technical features of HTGR and the current status of HTGR developments worldwide with emphasis on the R&D activities conducted by Japan Atomic Energy Agency (JAEA). JAEA as the center of excellence on R&D of the HTGR system in Japan, which leads the world R&D on HTGR and nuclear hydrogen production technologies, has successfully carried out the reactor passive safety demonstration and most recently the 50-day high-temperature operation test by using the High Temperature Engineering Test Reactor (HTTR) of 30 MWt. Based on the test results obtained in the HTTR, a commercial power generation system with gas turbine and an advanced system cogenerating electricity by the gas turbine and hydrogen by a thermochemical method have been designed. This paper concludes by giving a perspective of future HTGR developments.

38001533
Numerical visualization of boiling two-phase flow behavior in fuel bundles at simulated earthquake condition (in Japanese)
Takase, Kazuyuki; Misawa, Takeharu; Yoshida, Hiroyuki
Kashika Joho 30(Suppl.2), p.25-26(2010) ; (JAEA-J 08200)

In order to evaluate an influence of earthquake acceleration to the boiling two-phase flow behavior in nuclear reactors, numerical simulations were performed under the simulated earthquake condition. The two-phase flow analysis code, ACE-3D, was modified as the influence of the earth quake acceleration can calculate. To check out if the modification is adequate, a series of calculations were carried out and the following summaries were derived; (1) the void fraction in the fuel bundle receives the influence of the earthquake, (2) the liquid-phase in the two-phase flow moves in the same direction as the direction of oscillation due to the inputted earthquake acceleration, and (3) due to the density difference in comparison with the liquid phase, the gas phase of that moves in the direction opposite to the oscillating direction. This study enabled visualized evaluation of the boiling two-phase flow behavior in the nuclear reactors at the earthquake condition.

38001534
Preliminary consideration for laser welding simulation (in Japanese)
Kitamura, Tatsuaki*; Sakamoto, Kensaku; Takase, Kazuyuki
Kashika Joho 30(Suppl.2), p.359-360(2010) ; (JAEA-J 08201)

38001535
Evaluation of pressure-transmitting media for cryogenic experiments (in Japanese)
Tateiwa, Naoyuki; Haga, Yoshinori
Kotai Butsuri 45(4), p.225-234(2010) ; (JAEA-J 08202)

We have evaluated the fourteen kinds of pressure-transmitting media fro cryogenic experiments with the diamond anvil cell. The non-hydrostaticity of the pressure was evaluated from the value of the width of the ruby R₁ line at 10 GPa and 77 K. The media were classified into three groups from the value. It was found that the argon, nitrogen and helium provide the good hydrostatic pressure even in the low temperature region.

38001536
Safety of fast breeder reactor; A Lecture at the Tsuruga College (in Japanese)
Kitabata, Takuya
Nippon Anzengaku Kyoiku Kenkyu Kaishi 3, p.65-71(2010) ; (JAEA-J 08203)

Authors have given lectures on "Nuclear Safety" at the Tsuruga College to educate the students to obtain knowledge to judge the safety and values of nuclear power generation as a kind of literacy since 2003. This paper describes the contents of the final lecture of the "Nuclear Safety" on the "Safety of Fast Breeder Reactors (FBRs)". The paper explains the possibility of the positive void reactivity of FBRs and re-criticality in the unprotected loss of flow (ULOF) condition. As additional issues, sodium-water reaction and sodium leakage are also described. The risk communication booklet on the "Safety of Monju" as an activity for public relations is also explained.

38001537
Inelastic X-ray scattering and calculation studies of Pb(In_1/2Nb_1/2)O₃; Effect of B-site randomness on the antiferroelectric/relaxor nature of the ground state (in Japanese)
Owada, Kenji; Tomita, Yusuke*
Nippon Butsuri Gakkai-Shi 65(10), p.800-804(2010) ; (JAEA-J 08204)

38001538
Opinion of young researchers about implementation of new ICRP recommendation in domestic laws (in Japanese)
Ogino, Haruyuki*; Kono, Takahiko; Yamasoto, Kotaro; Fujiwara, Keiko*; Suzuki, Chihiro*
Nippon Genshiryoku Gakkai-Shi 52(8), p.458-461(2010) ; (JAEA-J 08206)

38001539
Emergency exposure situations (in Japanese)
Homma, Toshimitsu
Nippon Genshiryoku Gakkai-Shi 52(9), p.578-582(2010) ; (JAEA-J 08207)

38001540
Seismic safety logic on design and analysis for nuclear power plants (in Japanese)
Ohashi, Hirotada*; Narumiya, Yoshiyuki*; Miyata, Koichi*; Watanabe, Norio
Nippon Genshiryoku Gakkai-Shi 52(11), p.732-736(2010) ; (JAEA-J 08208)

38001541
In-situ analyses of chemical state and ionic distribution in the extraction chromatography column
Watanabe, So; Sano, Yuichi; Myochin, Munetaka; Okamoto, Yoshihiro; Shiwaku, Hideaki; Ikeda, Atsushi; Suzuki, Shinichi; Yaita, Tsuyoshi
Nippon Ion Kokan Gakkai-Shi 21(3), p.189-194(2010) ; (JAEA-J 08209)

Y-K edge X-ray absorption measurements on the extraction chromatography column revealed that distribution of Y ion and local structure around Y ion inside the column can be evaluated simultaneously. The ionic distribution and the local structure were derived from the X-ray absorption intensity and EXAFS analysis, respectively. Density profile of Y ion inside the packed column moved to downstream of the column and local structural parameters of the nearest O around Y changed by supplying eluent. The X-ray absorption spectroscopy of more than one element in the column is expected to reveal the separation mechanism of the extraction chromatography.

38001542
Zinc isotope fractionation in anion exchange in hydrochloric acid solution
Suzuki, Tatsuya*; Nomura, Masao*; Fujii, Yasuhiko*; Ikeda, Atsushi; Takaoka, Toru*; Oguma, Koichi*
Nippon Ion Kokan Gakkai-Shi 21(3), p.328-333(2010) ; (JAEA-J 08210)

Zinc isotope fractionation in an anion exchange resin has been investigated in hydrochloric acid solution by chromatographic technique. It was found that the heavier zinc isotopes were located disproportionately in the solution phase. The isotope fractionation coefficient was varied from the order of 10^-5 to 10^-4 depending on the hydrochloric acid concentration. The maximum isotope fractionation coefficient was obtained in 1 M hydrochloric acid, while the distribution coefficient of zinc became maximum at around 2 M hydrochloric acid. This difference has been further discussed based on the calculated speciation and structural information derived from X-ray absorption spectroscopy.

38001543
Experimental study on capacitance void fraction meters for high temperature and high pressure conditions (in Japanese)
Watanabe, Hironori; Mitsutake, Toru*; Shibata, Mitsuhiko; Takase, Kazuyuki
Nippon Kikai Gakkai Rombunshu, B 76(769), p.1379-1385(2010) ; (JAEA-J 08211)

The electro void fraction meter (Capacitance type meter) was applied to high temperature and high pressure condition measurement with various shapes of flow conduits such as rod bundle and pipe geometries. The principle of the meter is that the electrical capacitance of a gas liquid two phase flow changes with the void fraction. High frequency power supply enables to measure the electrical capacitance of the ion exchanged water with even though conductivity of pure water. It was confirmed by steam water boiling two phase flow experiments that void fraction can be obtained in real time way. Void fraction ranging from 0 to 0.9 at maximum was successfully measured under steam water boiling two phase flow conditions of 2 MPa through 18 MPa pressure.

38001544
Sensitivity analysis (in Japanese)
Koda, Masato*; Homma, Toshimitsu
Opereshonzu, Risachi 55(10), p.613-621(2010) ; (JAEA-J 08212)

38001545
Sensitivity analysis based on the FAST method (in Japanese)
Liu, Q.
Opereshonzu, Risachi 55(10), p.622-626(2010) ; (JAEA-J 08213)

FAST (Fourier Amplitude Sensitivity Test) is the earliest global sensitivity analysis method aiming at quantifying the contribution of the uncertainties in the model inputs to the uncertainty in the model output. The mechanism of FAST is to assign each model input with a characteristic frequency through a periodic search function. Then, for a specific model input, its contribution to the variance of the model output can be singled out by the characteristic frequency based on fourier analysis. FAST is computationally very efficient and is used widespread nowadays. In this work, the theory and the computational method of FAST are described in detail. It is hoped that this work will promote the application of FAST in the field of decision-making under uncertainty.

38001546
Global sensitivity analysis; Sobol' sensitivity indices (in Japanese)
Homma, Toshimitsu
Opereshonzu, Risachi 55(10), p.627-631(2010) ; (JAEA-J 08214)

38001547
Beam physics issues in energy-recovery linacs (in Japanese)
Hajima, Ryoichi
Purazuma, Kaku Yugo Gakkai-Shi 86(8), p.473-477(2010) ; (JAEA-J 08215)

38001548
Development of a high-contrast, high beam-quality, high-intensity laser (in Japanese)
Kiriyama, Hiromitsu; Mori, Michiaki; Nakai, Yoshiki*; Shimomura, Takuya; Sasao, Hajime*; Tanaka, Momoko; Ochi, Yoshihiro; Tanoue, Manabu*; Kondo, Shuji; Kanazawa, Shuhei; Daito, Izuru; Okada, Hajime; Wakai, Daisuke; Sasao, Fumitaka*; Suzuki, Masayuki; Kosuge, Atsushi; Kondo, Kiminori; Sugiyama, Akira; Bulanov, S. V.; Bolton, P.; Yokoyama, Atsushi; Daido, Hiroyuki; Kawanishi, Shunichi; Kimura, Toyoaki*; Tajima, Toshiki
Reza Kenkyu 38(9), p.669-675(2010) ; (JAEA-J 08216)

This paper reviews the temporal contrast and spatial beam quality improvement techniques in a high intensity Ti:sapphire laser system that is based on chirped-pulse amplification (CPA). We describe a low gain optical parametric chirped-pulse amplification (OPCPA) preamplifier that uses high energy, clean pulse seeding and is shown to significantly improve the contrast to better than 10^-10-10^-11 relative to the peak of the main femtosecond pulse. We also report the use of a diffractive optical element for beam homogenization of a 100 J level Nd:glass green pump laser, achieving a flat-topped spatial profile with a filling factor near 80 %.

38001549
Proton generation and terahertz radiation from a thin-foil target with a high-intensity laser
Sagisaka, Akito; Pirozhkov, A. S.; Mori, Michiaki; Yogo, Akifumi; Ogura, Koichi; Orimo, Satoshi; Nishiuchi, Mamiko; Ma, J.*; Kiriyama, Hiromitsu; Kanazawa, Shuhei; Kondo, Shuji; Nakai, Yoshiki*; Shimomura, Takuya; Tanoue, Manabu*; Akutsu, Atsushi; Okada, Hajime; Motomura, Tomohiro*; Daido, Hiroyuki; Kondo, Kiminori; Bulanov, S. V.; Esirkepov, T. Z.; Nashima, Shigeki*; Hosoda, Makoto*; Nagatomo, Hideo*; Oishi, Yuji*; Nemoto, Koshichi*; Choi, I. W.*; Lee, S. K.*; Lee, J.*
Reza Kenkyu 38(9), p.702-705(2010) ; (JAEA-J 08217)

High-intensity laser and thin-foil interactions produce high-energy particles, hard X-ray, high-order harmonics, and terahertz (THz) radiation. A proton beam driven by a high-intensity laser has received attention as a compact ion source for medical applications. In this study we have tested simultaneous generation of protons and THz radiation from a thin-foil target. We use a Ti:sapphire laser system (J-KAREN) at JAEA. A laser beam is focused by an off-axis parabolic mirror at the thin-foil target. We observed the high-energy proton in the rear side of the target and THz radiation in the reflected direction. Next, high energy protons are observed by reducing the size of preformed plasma.

38001550
Compensation of residual third-order dispersion in a fiber stretched, chirped-pulse amplification system using a grism pair (in Japanese)
Ogawa, Kanade; Akahane, Yutaka; Tsuji, Koichi; Yamakawa, Koichi
Reza Kenkyu 38(10), p.779-783(2010) ; (JAEA-J 08218)

We have newly designed a grism pair compensator for third-order dispersion in a fiber stretched chirped-pulse amplification system. In a numerical calculation, we have obtained a pedestal-free re-compressed pulse close to the transform-limited pulse using the grism pair. We have experimentally demonstrated a two-fold enhancement of peak intensity and pulse shortening of the compressed pulse with this device.

38001551
Extraction chromatographic separation of trivalent minor actinides using iHex-BTP/SiO₂-P resin
Surugaya, Naoki; Sano, Yuichi; Yamamoto, Masahiko; Kurosawa, Akira; Hiyama, Toshiaki
American Chemical Society, ACS Symposium Series 1046, "Nuclear Energy and the Environment" , p.131-139(2010) ; (JAEA-J 08219)

Extraction chromatographic separation of the long-lived trivalent minor actinides, Am(III) and Cm(III), has been performed to study the potential application of 2,6-bis(5,6-di-iso-hexyl-1,2,4-triazin-3-yl)-pyridine (iHex-BTP) impregnated into the porous silica support coated with styrene-divinylbenzene (SiO₂-P). The adsorption and elution characteristics of Am(III) and Cm(III) in nitric acid media have been investigated under some acid conditions to separate them from lanthanides using a column packed with iHex-BTP/SiO₂-P resins. Depending on the concentration of nitric acid solution as well as aqueous flow rate, a certain condition allowed us to selectively recover the fractions containing Am(III) and Cm(III) in a feed sample solution derived from PUREX raffinate. The proposed separation procedure and extraction profiles will be discussed in this presentation.

38001552
Radiation detection and measurement in patients contaminated with alpha emitters
Momose, Takumaro; Kurihara, Osamu; Takada, Chie; Furuta, Sadaaki
Proceedings of 1st International Symposium on Radiation Emergency Medicine at Hirosaki University , p.65-72(2010) ; (JAEA-J 08220)

The basic principle of radiation control at plutonium facility such as characteristics of plutonium and relevant radionuclide which are operated in nuclear fuel cycle facilities is introduced and potential radioactive contaminations in accident is discussed. As a practice, decontamination procedure of skin at Tokai Reprocessing Plant, some of the operating principles and applications of various radiation detection and measurement instruments for contamination control and occupational monitoring for internal contamination are introduced. Special methods of measurement for alpha emitters for performing radiological monitoring such as radio autography of plutonium contamination on smear samples, nasal swab sampling and measurement, in vivo and in vitro analysis for plutonium and uranium have been improved and proven. The internal dose calculation code was originally developed in order to estimate retrospectively in case of accidental intake of plutonium.

38001553
MOX fuel performance and database development for MOX fuel use in LWRs
Ozawa, Takayuki; Ikusawa, Yoshihisa
Proceedings of 2010 LWR Fuel Performance Meeting/TopFuel/WRFPM (CD-ROM) , p.72-81(2010) ; (JAEA-J 08221)

For the effective utilization of the energy resources, preparations are underway to recycle plutonium separated by reprocessing the spent fuels from nuclear power plants into nuclear fuels in Light Water Reactors (LWRs). In this nuclear fuel cycle, plutonium is reused as uranium-plutonium mixed dioxide (MOX). In Japan, a total of 772 MOX fuel assemblies were used in FUGEN without any failure until the end of its operation in March, 2003, the most MOX fuel usage by a thermal reactor in the world. Several post-irradiation examinations necessary to evaluate the MOX fuel performance were carried out for the MOX fuel assembly irradiated in FUGEN, and consequently we could obtain the usable data to evaluate the irradiation behavior of MOX fuels. Furthermore, several MOX fuel assemblies, which were equipped in-pile instruments, used in the irradiation tests, i.e. the regular operation irradiation tests, the ramp tests, and the load-follow tests, in Norway's "Halden" reactor (HBWR). We developed a MOX fuel database to make the most of our experiences with FUGEN and HBWR in helping improve the reliability of future MOX fuel use in LWRs.

38001554
ECP measurements under neutron and γ ray in in-pile loop and their data evaluation by water radiolysis calculations
Hanawa, Satoshi; Nakamura, Takehiko; Uchida, Shunsuke; Kus, P.*; Vsolak, R.*; Kysela, J.*
Proceedings of 2010 Nulcear Plant Chemistry Conference (NPC 2010)/8th Internatinal Radiolysis, Electrochemistry & Materials Performance Workshop (CD-ROM) , 10p.(2010) ; (JAEA-J 08222)

In order to establish reliable electrochemical corrosion potential (ECP) sensors for applying in reactor core peripherals of power plants, performance tests of sensors under irradiation were carried out in the in-pile loop of the experimental reactor, LVR-15, at the Nuclear Research Institute (NRI) in Czech Republic. Responses of different kinds of sensors under neutron and γ irradiation conditions have been compared each other. Corrosive conditions along the in-pile loop were calculated by water radiolysis calculation code, WRAC-J and calculated corrosive conditions were compared with the measured results. As a result of the evaluation, it was confirmed that the ECP sensors could be applied to irradiation conditions of reactor peripherals, while the water radiolysis model could be also applied for evaluation of corrosive conditions of reactor peripherals.

38001555
Correlation between the averaged internal structure and the coercive force of neodymium-iron-boron (Nd-Fe-B) sintered magnets investigated by small-angle neutron scattering
Takeda, Masayasu; Suzuki, Junichi; Yamaguchi, Daisuke; Akiya, Takahiro*; Kato, Hiroaki*; Une, Yasuhiro*; Sagawa, Masato*
Proceedings of 21st International Workshop on Rare-Earth Permanent Magnets and their Applications (REPM 2010) , p.161-164(2010) ; (JAEA-J 08223)

We performed small-angle neutron scattering (SANS) measurements of Nd-Fe-B sintered magnets to get information on the averaged internal microstructure of Nd-Fe-B sintered magnets including the interfacial structure which is a key parameter to achieve a high-coercivity Dy-free Nd-Fe-B sintered magnet. SANS patterns from the Nd-Fe-B sintered magnets measured with a two-dimensional detector of a small-angle neutron scattering spectrometer SANS-J-II in the research reactor JRR-3 were sensitive to the sintering and annealing condition of the samples. These results indicate that the SANS measurement is a promising tool to investigate the correlation between the coercivity and the internal microstructure of Nd-Fe-B sintered magnets.

38001556
Bypass flow computations using a one-twelfth symmetric sector for normal operation in a 350 MW_th prismatic VHTR
Johnson, R.*; Sato, Hiroyuki
Proceedings of 5th International Topical Meeting on High Temperature Reactor Technology (HTR 2010) (CD-ROM) , 8p.(2010) ; (JAEA-J 08224)

Calculations are performed using CFD for flow of the helium coolant in the gap and coolant channels along with conjugate heat generation and heat transfer in the fuel compacts and graphite of a 350 MW_th prismatic reactor. Various scenarios are computed by varying the gap width from zero to 5 mm, varying the total heat generation rate to examine average and peak radial generation rates and variation of the graphite block geometry to account for the effects of shrinkage caused by irradiation. It is shown that the effect of increasing gap width causes increased maximum fuel temperature while providing significant cooling to the near-gap region. The maximum outlet coolant temperature variation is increased by the presence of gap flow and also by an increase in total heat generation with a gap present. The effect of block shrinkage is actually to decrease maximum fuel temperature compared to a similar reference case.

38001557
Surface heat flux and temperature measurements in nucleate pool boiling
Liu, W.; Takase, Kazuyuki
Proceedings of 8th International Topical Meeting on Nuclear Thermal-Hydraulics, Operation and Safety (NUTHOS-8) (CD-ROM) , 10p.(2010) ; (JAEA-J 08225)

A system for measuring the surface temperature and the surface heat flux of a heating block was developed that has no need for a sensor set on the surface. The system consisted of two parts: (1) inner block temperatures were measured using micro-thermocouples; (2) using the measured temperatures, an inverse heat conduction problem was solved to get the surface heat flux and surface temperature. For the inner block temperature measurement, special T-type micro thermocouples with a common positive pole were developed. A total of 10 thermocouples were set at a depth of 3.1 micro meter beneath the boiling surface, along a radius of 5 mm. The developed system was verified using a pool boiling experiments. Experiments were performed at atmospheric pressure. The experiments showed that the developed special T-type micro thermocouples can successfully measure the temperature change in a boiling process. By using the measured temperature, a semi-infinite inverse heat conduction problem was solved to get the surface heat flux and surface temperature. The change in surface heat flux and surface temperature in a bubble cycle was derived.

38001558
Thermal-hydraulic analysis of MONJU upper plenum under 40% rated power operational condition
Honda, Kei; Ohira, Hiroaki; Sotsu, Masutake; Yoshikawa, Shinji
Proceedings of 8th International Topical Meeting on Nuclear Thermal-Hydraulics, Operation and Safety (NUTHOS-8) (CD-ROM) , 12p.(2010) ; (JAEA-J 08226)

In this study, we calculated the thermal hydraulics of the upper plenum of MONJU by the detailed analysis model using commercial FVM code, FrontFlow/Red. The present analysis model simulates all structures with high resolution meshes. The 1st order upwind and 2nd order central difference scheme were applied to the advection and diffusion terms, respectively. And RNG k-ε model was applied to turbulence modeling. These calculation results indicated that the structures installed in the plenum except for UIS did not affect largely to the temperature and velocity, the flow characteristics in the present results had similar tendencies with porous media approached applied to the UCS region and that the difference between the temperature measured in the UCS region and that of SA outlets is relatively small.

38001559
Development of level 2 PSA methodology for sodium-cooled fast reactors, 1; Overview of evaluation technology development
Nakai, Ryodai; Suzuki, Toru; Kamiyama, Kenji; Seino, Hiroshi; Koyama, Kazuya*; Morita, Koji*
Proceedings of 8th International Topical Meeting on Nuclear Thermal-Hydraulics, Operation and Safety (NUTHOS-8) (CD-ROM) , 12p.(2010) ; (JAEA-J 08227)

The evaluation technology of Level-2 PSA for Sodium-Cooled Fast Reactors (SFRs) was established in order to systematically assess the core damage sequences. In addition to the existing computational tools for Level-2 PSA, the computational tools, MUTRAN and SIMMER-LT were developed for core material relocation phase. Also the analytical models, CORCON and VANESA, were improved based on newly performed experiments for the ex-vessel phase taking into account the feature of SFRs. The technical information was compiled as technical database used in the construction and quantification of level-2 PSA event trees for SFRs. The technical basis was established for the Level-2 PSA for SFRs.

38001560
Development of a uniform beam irradiation system by the nonlinear focusing method
Yuri, Yosuke; Yuyama, Takahiro; Ishizaka, Tomohisa; Ishibori, Ikuo; Okumura, Susumu
Proceedings of 9th International Workshop on Radiation Effects on Semiconductor Devices for Space Applications (RASEDA-9) , p.121-124(2010) ; (JAEA-J 08228)

A research and development study has been in progress on the formation and irradiation of a uniform ion beam using multipole magnets at TIARA of JAEA. The uniform beam irradiation system is based on the nonlinear focusing method, which enables us to make the beam's Gaussian distribution uniform and irradiate any position on a large-area sample at a constant particle fluence rate. In this paper, several measurement techniques have been investigated to tune the beam in real time and evaluate characteristics of a large-area uniform beam. By measuring the 2D relative distribution using radiochromic films, we have confirmed that a uniform proton beam of 6 cm square with 6 % uniformity is formed. Features of the uniform irradiation by means of the nonlinear focusing method are also discussed.

38001561
Cocktail beam acceleration technique for quick change of microbeam at the JAEA AVF cyclotron
Kurashima, Satoshi; Yoshida, Kenichi; Sato, Takahiro; Miyawaki, Nobumasa; Kashiwagi, Hirotsugu; Okumura, Susumu; Kamiya, Tomihiro; Yokota, Wataru
Proceedings of 9th International Workshop on Radiation Effects on Semiconductor Devices for Space Applications (RASEDA-9) , p.234-237(2010) ; (JAEA-J 08229)

A heavy-ion microbeam is provided for the TIBIC experiment and living-cell irradiation in biotechnology at the JAEA AVF cyclotron facility. A microbeam of 260-MeV ²⁰Ne⁷⁺ with a spot size less than 1 μm in diameter is formed using a flat-top acceleration system. Users of the microbeam need a wide range of linear energy transfer (LET), and the ion species and/or energy have to be changed in order to vary LET. However, it takes a few hours to tune the cyclotron for the microbeam formation so that a microbeam of one species is usually provided in one beam time. A cocktail beam acceleration technique has been adopted to change the ion species quickly. In this technique, ion species having almost the same mass to charge ratio (M/Q) are injected into the cyclotron simultaneously, and only one ion species whose cyclotron resonance frequency is equal to the acceleration frequency is extracted from the cyclotron. Another species is extracted by slightly shifting the acceleration frequency. The magnetic rigidity of extracted beams is the same, therefore, lens parameters of the beam transport line are not required to be changed basically. Quick change of ion species of microbeam from 260-MeV ²⁰Ne⁷⁺ to 520-MeV ⁴⁰Ar¹⁴⁺ was examined for a cocktail with M/Q = 2.85 and successfully performed within 30 minutes.

38001562
Numerical simulations of thermal-mixing in T-junction piping system using large eddy simulation approach
Tanaka, Masaaki; Ohshima, Hiroyuki
Proceedings of CFD for Nuclear Reactor Safety Applications (CFD4NRS-3) Workshop (CD-ROM) , 12p.(2010) ; (JAEA-J 08230)

A large eddy simulation code MUGTHES has been developed to investigate thermal mixing phenomena related to high-cycle thermal fatigue in structure. A part of verification and validation study is introduced and thermal striping phenomena in a T-pipe of WATLON experiment in JAEA are numerically investigated by using MUGTHES. Numerical results are validated by measured velocity and temperature profiles. The temperature fluctuation generation mechanism is revealed in relation with the large-scale vortex structures formed around the branch pipe jet.

38001563
Spatio-temporal mapping; A Technique for overview visualization of time-series datasets
Miyamura, Hiroko; Hayashi, Sachiko*; Suzuki, Yoshio; Takemiya, Hiroshi
Proceedings of Joint International Conference of 7th Supercomputing in Nuclear Application and the 3rd Monte Carlo (SNA + MC 2010) (USB Flash Drive) , 4p.(2010) ; (JAEA-J 08231)

We propose a spatio-temporal information mapping technique and the map design function. The spatio-temporal map is created by spatio-temporal information mapping technique. In the map, the change of a physical quantity is allocated in two-dimensional space with spatial and temporal information in each dimension. By the way, it is helpful for users to change the map interactively, such as changing the resolution of the map, colored physical quantity, and so on. Therefore, the function enabling users to design the map by changing the tree structure is also developed.

38001564
Verification of detailed two-phase flow simulation code TPFIT to water jet experiment
Yoshida, Hiroyuki; Suzuki, Takayuki*; Takase, Kazuyuki; Koizumi, Yasuo*
Proceedings of Joint International Conference of 7th Supercomputing in Nuclear Application and the 3rd Monte Carlo (SNA + MC 2010) (USB Flash Drive) , 4p.(2010) ; (JAEA-J 08232)

In this study, the detailed two-phase flow simulation code TPFIT developed in the JAEA was applied to the water jet experiment as a first step of the validation work of the TPFIT for annular and dispersed flow. The liquid film that flowed on the fuel rod surface under the annular two-phase flow condition was imitated as the water jet. In the experiment, water gushed out downward from the nozzle to the atmosphere, and the water jet shapes were observed by a high-speed camera. Results of the detailed numerical simulation of the TPFIT were compared with the measured data including water jet shapes, water jet collapse length and length of water jet surface wave. In the results, the TPFIT could predict length of water jet surface wave. However, the predicted collapse length did not agree with the measured values. It is concluded that the evaluation method of surface tension force must be modified to improve accuracy of numerical simulations.

38001565
Structural simulation and modeling for assembly in real space
Nakajima, Norihiro; Nishida, Akemi; Suzuki, Yoshio; Yamada, Tomonori; Takemiya, Hiroshi; Iyoku, Tatsuo
Proceedings of Joint International Conference of 7th Supercomputing in Nuclear Application and the 3rd Monte Carlo (SNA + MC 2010) (USB Flash Drive) , 4p.(2010) ; (JAEA-J 08233)

FIESTA is a large scale simulation, which concerns a simulation space to bring real world in digital space, such as so named either virtual reality or virtual facility. In order to establish a huge and complex object like nuclear facilities of a real world, there are lack of methodology and technology for reproducing facilities in digital space. FIESTA attempts to realize an assembly structural analysis for supplying one of the methodologies to reproduce facilities in digital space. The first attempt of the structural analysis for assembly is accomplished by finite element analysis by integrating parts of facilities. Since the structural analysis for assembly requests massive calculation, parallel and distributed computing was applied for the computational environment. The structural analysis for assembly by finite element method is confirmed to be able to analyze a huge and complex facility and show results of numerical experiment by applying to a test reactor driven by JAEA.

38001566
Numerical analysis on thermal-hydraulics of supercritical water flowing in a tight-lattice fuel bundle
Nakatsuka, Toru; Misawa, Takeharu; Yoshida, Hiroyuki; Takase, Kazuyuki
Proceedings of Joint International Conference of 7th Supercomputing in Nuclear Application and the 3rd Monte Carlo (SNA + MC 2010) (USB Flash Drive) , 4p.(2010) ; (JAEA-J 08234)

To evaluate thermal hydraulic characteristics of a tight-lattice fuel bundle of supercritical water reactor (Super Fast Reactor), a simplified 19-rod fuel assembly was analyzed with a three-dimensional two-fluid model analysis code ACE-3D. In this calculation, a one-twelfth model is adopted as the computational domain taking advantage of symmetry. As the boundary conditions, mass velocity, inlet enthalpy and power distribution are to be the same as the steady state condition of the reactor. Cross-sectional local power distribution in the fuel assembly is set to be flat. Effect of grid spacers is taken into account in the analysis. Maximum clad surface temperature (MCST) is observed at the position facing to the narrowest gap on the center rod near the outlet and the value is 628°C that is almost the same as results without grid spacers. The predicted MCST satisfies a thermal design criteria to ensure fuel and cladding integrity: the MCST should be less than 650°C.

38001567
Application of GPU to Multi-interfaces Advection and Reconstruction Solver (MARS)
Nagatake, Taku; Kunugi, Tomoaki*; Takase, Kazuyuki
Proceedings of Joint International Conference of 7th Supercomputing in Nuclear Application and the 3rd Monte Carlo (SNA + MC 2010) (USB Flash Drive) , 5p.(2010) ; (JAEA-J 08235)

In the nuclear engineering fields, a high performance computer system is necessary to perform the large scale computations. Recently, a GPU (Graphics Processing Unit) has been developed as a rendering computational system in order to reduce a CPU (Central Processing Unit) load. The GPU consists of many processing units and a wide memory bandwidth in order to achieve the high-performance computing for rendering the high quality 3D objects. Nowadays, the performance of GPU has become much higher than that of the CPU, so the attempt to make use of the GPU for the scientific computations and more broad purposes is being performed. In this study, the MARS (Multi-interfaces Advection and Reconstruction Solver) which is one of the interface volume tracking methods for multiphase flows was developed by using the GPU.

38001568
On-the-fly computing on many-core processors in nuclear applications
Kushida, Noriyuki
Proceedings of Joint International Conference of 7th Supercomputing in Nuclear Application and the 3rd Monte Carlo (SNA + MC 2010) (USB Flash Drive) , 6p.(2010) ; (JAEA-J 08236)

Several applications in nuclear energy field require dedicated supercomputing environment (DSE). One of the greatest common aspects of DES applications is that they have to complete tasks within deadlines. High-end supercomputers are not suitable for DSE applications, because it is publically shared facilities and allotted time for a person is quite limited. Moreover, owning a high end supercomputer is not realistic because of the high price of supercomputers. On the other hand, many core processors have good cost performance and therefore they are suitable for DSE. In the present paper, the author describes the feasibility of many-core processors for such purpose by using two examples: (1) Fusion reactor monitoring and (2) Infrasound propagation analysis.

38001569
Development of numerical simulation code for thermal striping phenomena in Japan sodium cooled fast reactor
Tanaka, Masaaki; Murakami, Satoshi*; Oki, Hiroshi*; Ohshima, Hiroyuki
Proceedings of Joint International Conference of 7th Supercomputing in Nuclear Application and the 3rd Monte Carlo (SNA + MC 2010) (USB Flash Drive) , 6p.(2010) ; (JAEA-J 08237)

Strategy of the numerical estimation method development for the thermal fatigue in JSFR at JAEA is explained from the numerical simulation code development step to the application step for practical problems. Numerical simulation codes prepared for the study and outlines of the verification and validation study are briefly described. Numerical results in a T-junction piping system and typical numerical results around typical control rod channels and the blanket fuel subassemblies simulating the JSFR are shown as examples in recent progress.

38001570
Fault-tolerant mechanism of both job execution and file transfer for integrated nuclear energy simulation
Tatekawa, Takayuki; Teshima, Naoya; Suzuki, Yoshio; Takemiya, Hiroshi
Proceedings of Joint International Conference of 7th Supercomputing in Nuclear Application and the 3rd Monte Carlo (SNA + MC 2010) (USB Flash Drive) , 6p.(2010) ; (JAEA-J 08238)

In the nuclear field, various large-scale integrated simulations which cannot be executed with single job have been developed to reveal physical and engineering phenomena. Such integrated simulations are accomplished by coupling several simulation codes, each of which is charge of each physical process or each engineering part of whole system. Fault-tolerant (FT) mechanism is very important to run such simulations on the error-prone environment such as Grid. We developed functions of error detection, job re-submission, and file re-transfer and integrated them as a FT mechanism. Our test run of integrated nuclear energy application showed that the FT mechanism sustained the long run of the application by recovering the job failure automatically.

38001571
Development of method for evaluation of three dimensional distribution of in situ stress state and preliminary estimation of applicability
Tanno, Takeo; Hirano, Toru*; Matsui, Hiroya
Rock Stress and Earthquakes; Proceedings of 5th International Symposium on In-situ Rock Stress (ISRS-5) , p.521-526(2010) ; (JAEA-J 08239)

Japan Atomic Energy Agency has developed a method for accurate evaluation of the distributions of actual in-situ stress state at any point using limited results of in-situ stress measurement from surface based investigations. We assumed that the actual stress components are formed by a combination of overburden pressure and the plate tectonic force, and constructed two types of models, the three-dimensional finite element method and the boundary element method that considered the existence of geological heterogeneity, such as variations in rock type and faults. Afterwards, as a validation of these models, we applied this method to in-situ stress state evaluation for some locations around the Mizunami Underground Research Laboratory (MIU).

38001572
Runoff analysis in Horonobe basin based on spatial estimation of hydrological quantities (in Japanese)
Yamamoto, Yoichi; Maekawa, Keisuke; Yokota, Hideharu; Mukai, Kazuyuki*; Ishii, Keiji*
Doboku Gakkai Heisei-22-Nendo Zenkoku Taikai Dai-65-Kai Nenji Gakujutsu Koenkai Koen Gaiyoshu (DVD-ROM) , p.525-526(2010) ; (JAEA-J 08240)

38001573
On the plant life of nuclear power plant (in Japanese)
Suzuki, Masahide
Enerugi Seisaku Kenkyu Tokubetsugo, 7 , p.24-27(2010) ; (JAEA-J 08241)

38001574
Common platform for communication among stakeholders using argumentation model for safety (in Japanese)
Osawa, Hideaki; Hioki, Kazumasa; Makino, Hitoshi; Semba, Takeshi; Umeki, Hiroyuki; Takase, Hiroyasu*
Kenkyu, Gijutsu Keikaku Gakkai Dai-25-Kai Nenji Gakujutsu Taikai Oyobi Sokai Koen Yoshishu (CD-ROM) , p.55-60(2010) ; (JAEA-J 08242)

This paper describes new concept of common platform for communication among stakeholders using argumentation model for safety on geological disposal.

38001575
Experimental study of airflow-mixture (in Japanese)
Kamiji, Yu; Terada, Atsuhiko; Sugiyama, Hitoshi*
Nippon Kikai Gakkai Kanto Shibu Yamanashi Koenkai (2010) Koen Rombunshu , p.98-99(2010) ; (JAEA-J 08243)

The Japan Atomic Energy Agency (JAEA) has been conducting simulation design study on process gas reactor for one of the heat utilization system components development of HTGR (High Temperature Gas-cooled Reactor). But, numerical analysis of gas-mixing turbulent flow in reactor is difficult. Also, it is lack of experimental results for verification of the numerical analysis model featured this flow field. Therefore, in order to obtain the experimental data to verify this analysis model, it was carried out that an experimental study in bent rectangular duct with flow control door by using PIV (Particle Image Velocimetry). As a result of this study, it was obtained representative velocity distribution data at the vertical cross section of the duct.

38001576
Sequence dependencies of DNA strucutural dynamics and hydration; Torwards understanding the molecular recognition of DNA (in Japanese)
Yonetani, Yoshiteru; Kono, Hidetoshi
Yuragi To Seitai Kino , p.66-71(2010) ; (JAEA-J 08245)

38001577
Development on in-reactor observation system using cherenkov light
Tsuchiya, Kunihiko; Kitagishi, Shigeru; Nagao, Yoshiharu; Takemoto, Noriyuki; Naka, Michihiro; Kimura, Akihiro; Sano, Tadafumi*; Unesaki, Hironobu*; Yoshimoto, Takaaki*; Nakajima, Ken*; Fujiwara, Yasuyuki*; Okumura, Kiyoshi*; Yamamoto, Shuji*
KURRI Progress Report 2009 , p.196(2010) ; (JAEA-J 08246)

38001578
Technology development of K and N type multi-paired thermocouple for temperature measurement under neutron irradiation (in Japanese)
Kitagishi, Shigeru; Inoue, Shuichi; Saito, Takashi; Omi, Masao; Tsuchiya, Kunihiko
UTNL-R-0475 , p.2_5_1-2_5_9(2010) ; (JAEA-J 08247)

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JAEA > JAEA Library > JOPSS > Papers Published in Journals [Back Issues] > December 2010