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Hama, Katsuhiro; Mikake, Shinichiro; Ishibashi, Masayuki; Sasao, Eiji; Kuwabara, Kazumichi; Ueno, Tetsuro; Onuki, Kenji*; Beppu, Shinji; Onoe, Hironori; Takeuchi, Ryuji; et al.
JAEA-Review 2015-024, 122 Pages, 2015/11
JAEA-Review-2015-024.pdf:80.64MB
Japan Atomic Energy Agency (JAEA) at Tono Geoscience Center (TGC) is pursuing a geoscientific research and development project namely the Mizunami Underground Research Laboratory (MIU) Project in crystalline rock environment in order to construct scientific and technical basis for geological disposal of High-level Radioactive Waste (HLW). The MIU Project has three overlapping phases: Surface-based Investigation phase (Phase I), Construction phase (Phase II), and Operation phase (Phase III). The MIU Project has been ongoing the Phase III, as the Phase II was concluded for a moment with the completion of the excavation of horizontal tunnels at GL-500m level in February 2014. This report presents the results of the investigations, construction and collaboration studies in fiscal year 2014.
nanoparticlesYoneda, Yasuhiro; Kohara, Shinji*; Kato, Kazumi*
Japanese Journal of Applied Physics, 52(9), p.09KF01_1 - 09KF01_5, 2013/09
Times Cited Count：8 Percentile：34.42(Physics, Applied)The atomic-scale structure of nanocrystalline BaTiO powders has been studied using high-energy X-ray diffraction, X-ray absorption fine structure, and the atomic pair-distribution function technique. The studies show that the materials are well-ordered at nanometer length distance. The three-dimensional atomic ordering in BaTiO is cubic-like on average, but locally shows slight distortions of a tetragonal-type, similar to that occurring in the coarsegrained bulk crystals. Ferroelectric coherence is facilitated in part by control of particle morphology. The spatial extent of cooperative ferroelectric distortions is found to be degraded in nanometer-sized building blocks.
Hirano, Fumio; Sato, Seichi*; Kozaki, Tamotsu*; Inagaki, Yaohiro*; Iwasaki, Tomohiko*; Oe, Toshiaki*; Kato, Kazuyuki*; Kitayama, Kazumi*; Nagasaki, Shinya*; Niibori, Yuichi*
Journal of Nuclear Science and Technology, 49(3), p.310 - 319, 2012/03
Times Cited Count：0 Percentile：0.01(Nuclear Science & Technology)The thermal impacts of hull and end piece wastes from the reprocessing of MOX spent fuels burned in LWRs on repository performance were investigated. The heat generation rates in MOX spent fuels and the resulting heat generation rates in hull and end piece wastes change depending on the fuel histories including the burn-up of UO
spent fuels, the cooling period before reprocessing, the storage period of fresh MOX fuels. The heat generation rates of hull and end piece wastes from the reprocessing of MOX spent fuels with any of those histories are significantly larger than those from UO spent fuels with burn-ups of 45 GWd/THM. If a temperature below 80
C is specified for cement-based materials used in waste packages after disposal, the allowable number of canisters containing compacted hull and end pieces in a package for 45 GWd-MOX needs to be limited to a value of 0.7 to 1.6, which is significantly lower than the value of 4.0 for 45 GWd-UO.
Kawachi, Tetsuya; Hasegawa, Noboru; Nishikino, Masaharu; Ishino, Masahiko; Imazono, Takashi; Oba, Toshiyuki; Kaihori, Takeshi; Kishimoto, Maki; Ochi, Yoshihiro; Tanaka, Momoko; et al.
X-Ray Lasers 2010; Springer Proceedings in Physics, Vol.136, p.15 - 24, 2011/12
This paper reviews recent improvement in the source development of laser-driven X-ray lasers and the applications in the research fields of material science, laser processing, X-ray imaging, and radiation damage in biological cells. In the application for material science, we have firstly observed temporal correlation between the domain structures of ferro-electric substance under the Curie temperature. In the laser processing, new X-ray laser interferometer reveals us the nano-scale surface distortion of substance pumped by a femto-second optical pulse. In the X-ray diffraction image, we have taken several static images of micro-structure of samples: now we are trying to extend the objective to nano-scale dynamics using pump and probe method. In the radiation damage of biological cells, we observed double strand break in DNA using X-ray laser exposure; this results are compared with the case using incoherent several KeV X-ray exposure.
Kosaka, Nami*; Sugai, Tatsuhisa*; Nagasawa, Kazumichi*; Tanizaki, Yuta*; Meguro, Mizue; Aizawa, Yoichi*; Maekawa, Shun*; Adachi, Motoyasu; Kuroki, Ryota; Kato, Takashi
Journal of Experimental Biology, 214(6), p.921 - 927, 2011/03
Times Cited Count：29 Percentile：70.27(Biology)Oxygen is essential for the survival of animals. Red blood cells are responsible for transporting oxygen to tissues. We established a semi-solid colony forming assay, and showed that recombinant xlEPO induces erythroid colony formation in vitro and detected an increased level of erythropoietin activity in blood serum during acute anemic stress. In addition, the study demonstrated the possible presence of multiple, non-xlEPO, factors in anemic serum supportive of erythroid colony formation. These results indicate that erythropoiesis mediated by erythropoietin is present in amphibian species and, furthermore, that the regulatory mechanisms controlling peripheral erythrocyte number may vary among vertebrates.
Nishihara, Katsunobu*; Sunahara, Atsushi*; Sasaki, Akira; Nunami, Masanori*; Tanuma, Hajime*; Fujioka, Shinsuke*; Shimada, Yoshinori*; Fujima, Kazumi*; Furukawa, Hiroyuki*; Kato, Takako*; et al.
Physics of Plasmas, 15(5), p.056708_1 - 056708_11, 2008/00
Times Cited Count：122 Percentile：97.47(Physics, Fluids & Plasmas)Takahashi, Toru; Kato, Shoichi; Nakagiri, Toshio; Aoto, Kazumi
Nihon Genshiryoku Gakkai Wabun Rombunshi, 5(4), p.347 - 357, 2006/12
no abstracts in English
Nakagiri, Toshio; Kase, Takeshi; Kato, Shoichi; Aoto, Kazumi
JSME International Journal, Series B, 49(2), p.302 - 308, 2006/05
A new thermo-chemical and electrolytic hybrid hydrogen production system in lower temperature range is newly proposed by the Japan Atomic Energy Agency (JAEA) to realize the hydrogen production from water by using the heat generation of sodium cooled Fast Breader Reactor (FBR). The system is based on sulfuric acid (HSO
) synthesis and decomposition process developed earlier (Westinghouse process), and sulfur trioxide (SO
) decomposition process is facilitated by electrolysis with ionic oxygen conductive solid electrolyte to reduce the operation temperature 200-300 C lower than Westinghouse process. SO decomposition was confirmed experimentally, and theoretical thermal efficiency was evaluated. Furthermore, hydrogen production experiments to substantiate the whole process were performed. Stable hydrogen and oxygen production were observed in the experiments, and maximum duration of the experiments was about 5 hours.
Kawachi, Tetsuya; Nagashima, Keisuke; Kishimoto, Maki; Hasegawa, Noboru; Tanaka, Momoko; Ochi, Yoshihiro; Nishikino, Masaharu; Kawazome, Hayato; Tai, R.; Namikawa, Kazumichi*; et al.
Proceedings of SPIE's International Symposium on Optics and Photonics 2005, Vol.5919, p.59190L_1 - 59190L_11, 2005/09
Recent results of the X-ray laser research in Advanced Photon Research (APR) Center in JAERI are reported. In the application of the nickel-like silver laser at a wavelength of 13.9 nm, we report the observation of the microscopic polarization clusters in ferroelectrics material such as BaTi03 by use of the X-ray speckle technique, and other experiments such as photo-ionization of inner-shell electrons are intoroduced. In the development of high quality X-ray laser beam, recently we demonstrated temporally coherent X-ray beam at 23.6 nm, in which the high-order harmonics light was injected into the Ne-like Mn X-ray amplifier. We also mention about the development of new X-ray laser driver laser, which is based on 2 beams of zig-zag slab Nd:glass lasers with 0.1 Hz repetition-rate, and each beam line can provide 10 J output energy, and 1 ps duration.
Nakagiri, Toshio; Kase, Takeshi; Kato, Shoichi; Aoto, Kazumi
Proceedings of 13th International Conference on Nuclear Engineering (ICONE-13) (CD-ROM), 7 Pages, 2005/05
A new thermochemical and electrolytic hybrid hydrogen production system for sodium cooled FBR has been proposed and developed by JNC. SO3 splitting experiments, theoretical evaluation of thermal efficiency and hydrogen production experiments to substantiate the whole process were performed. Maximum 5 hours stable hydrogen production was obserbed in the hydrogen production experiments.
Nakagiri, Toshio; Kase, Takeshi; Kato, Shoichi; Aoto, Kazumi; Takamori, Yuji*
JNC TN9400 2005-016, 27 Pages, 2005/04
JNC-TN9400-2005-016.pdf:1.37MB
To improve the energy efficiency of the thermo-chemical and electrolytic hybrid hydrogen production system, the techniques and electrolysis condition which reduced the voltage loss of sulfurous acid solution electrolysis were surveyed and discussued. As the result of the survey and discussion, a gas diffusion type anode was effective in a reduction of voltage loss, a cathode poisoning by sulfur and a omission of SO absorption part. A membrane electrode assembly type cathode was expected to reduce a voltage loss because of the minimum distance between membrane and electrode. In the point of voltage loss reduction, a stream type cell was proper to achieve a rapid reaction material supply. It was effective for experimental apparatus with capability in 1L/h hydrogen production to adopt these techniques, because a cell, which adopted these techniques, achieved a current density of more than 100mA/cm
.
Onizawa, Takashi; Ando, Masanori; Wakai, Takashi; Kato, Shoichi; Aoto, Kazumi
JNC TN9400 2005-012, 99 Pages, 2005/03
JNC-TN9400-2005-012.pdf:9.77MB
The high chromium (Cr)ferritic steels have both excellent thermal properties and strength at elevated temperature. Therefore, the applicability of high Cr ferritic steels for structural material of the future advanced Fast Breeder Reactor is investigated. In previous study, a series of trial products controlling the vanadium (V)and niobium(Nb) contents is produced to investigate the efficiency and/or stability of these elements for the development of the high chromium ferritic steel FBR grade. In this study, tensile, impact, creep tests and observations are conducted in order to investigate the influence of V and Nb contents on the mechanical properties and stability of microstructures. These tests and observations are conducted for the as received materials and aged ones. As a result, the following conclusions are obtained ;(1)The higher strength and the lower ductility are obtained with the increases of V and Nb as far as this study investigates. There is little influence of V and Nb on relation between steady state creep rate, time to beginning of tertiary creep and creep rupture time.(2)The impact properties degrade with the increases of V and Nb, since Laves phase don't precipitate in the trial products with aging at 600 for 6000h. For that reason impact properties hardly fell.(3)Fine MX (V(C,N) and/or NbC) are observed in the steels which contain V and/or Nb. The number of MX increases with the increase of contents of V and/or Nb. It is show that they are likely to be stable under the condition of aging at 600 for 6000h.(4)The fine Cr (C,N) is nucleated from V(C,N). And the fine Cr (C,N) may be expected to suppress the growth of M
C
. This may be caused by V contained in Cr (C,N).
Nakagiri, Toshio; Horikiri, Morito; Kato, Shoichi; Kase, Takeshi; Aoto, Kazumi; Takamori, Yuji*; Fukasaku, Hiroshi*
JNC TN9400 2004-056, 98 Pages, 2004/09
JNC-TN9400-2004-056.pdf:5.58MB
Hydrogen production demonstration experiments from water by the thermochemical and electrolytic hybrid hydrogen production process were performed. The feasibility of this hydrogen production process was demonstrated and technical problems to operate longer uration and to develop 1Nl/h-H2 production experimental apparatus were extracted. (1) Continuous and stable hydrogen and oxygen generation by the hybrid process was measured in the four full process experiments and maximum test duration was about five hours. The generation rate of hydrogen and oxygen calculated from measured current in four full process experiments were 4.03ml/h - 5.04ml/h and 2.07ml/h - 2.78ml/h, respectively. The total amounts of generated hydrogen and oxygen in the four experiments were 35.00ml and 20.99ml. (2) Severe material corrosion was not observed for gold plated stainless steel and S03 electrolysis cell (YSZ, Pt paste electrode) which used in sulfuric acid atmosphere at about 550 deg-C, and ionic oxygen conductivity of YSZ did not decrease in the experiments. Nevertheless, corrosion of the gold plated outlet piping of S03 electrolysis cell was observed, and the corrosion by condensed sulfuric acid as suspected. (3) Technical problems to operate the present experimental apparatus for 100 hours and to develop test apparatus to generate 1Nl/h hydrogen, were extracted.
; ; Wakai, Takashi; Aoto, Kazumi; Ueno, Fumiyoshi; Nagae, Yuji; Kato, Shoichi; Saito, Junichi
JNC TN9400 2003-034, 26 Pages, 2003/05
JNC-TN9400-2003-034.pdf:1.16MB
The structual material of the future Fast Breeder Reactors(FBRs) must be improved to achive some requirements for improvement of safety and economical competitiveness. To prepare the desired data for the structural material development for the future FBRs, some mechanical and chemical tests, i.e. high temterature tensile tests and sodium corrosion tests, of the high-purity Fe-Cr alloys were conducted under the FBR conditions. As a result, following conclusions are obtained; 1) By eliminating the trace elements, high Cr content iron based alloys can be produced. It was clarified that such alloys have good tensile properties and creep strength enough for practical use at elevated temperature. 2) Through the manufacturing of a full size structure using the high purity Fe-50% Cr alloy, it was confirmed that the alloy has good manufacturability enough for practical use."
by means of X-ray lasersTai, R.; Namikawa, Kazumichi*; Kishimoto, Maki; Tanaka, Momoko; Sukegawa, Kota*; Hasegawa, Noboru; Kawachi, Tetsuya; Kado, Masataka; Lu, P.; Nagashima, Keisuke; et al.
Physical Review Letters, 89(25), p.257602_1 - 267602_4, 2002/12
Times Cited Count：40 Percentile：81.12(Physics, Multidisciplinary)no abstracts in English
Kato, Yoshiaki; Daido, Hiroyuki; Nagashima, Keisuke; Kawachi, Tetsuya; Hasegawa, Noboru; Tanaka, Momoko; Tang, H.; Tai, R.; Lu, P.; Kishimoto, Maki; et al.
AIP Conference Proceedings 641, p.31 - 39, 2002/00
no abstracts in English
Chen, Z.; Aoto, Kazumi; Kato, Shoichi; Nagae, Yuji; Miya, Kenzo
International Journal of Applied Electromagnetics and Mechanics, 16(3-4), p.197 - 206, 2002/00
Times Cited Count：14 Percentile：58.55(Engineering, Electrical & Electronic)None
Kato, Shoichi; Onizawa, Takashi; Yoshida, Eiichi; Aoto, Kazumi
JNC TN9520 2001-001, 116 Pages, 2001/01
JNC-TN9520-2001-001.pdf:3.44MB
For the development of the fast breeder reactor, this manual described the method of in-air and in-sodium test for materials and the arrangement method of the data. This manual is reflected the revision of Japanese Industrial Standard (JIS) and change to the international unit. The test method of domestic committees such as the VAMAS (Versailles Project on Advanced Materials and Standards) workshop was also considered. And, the material test technologies accumulated in this group until now were arranged in order to transmit all of them.
Watashi, Katsumi; Aoto, Kazumi; Aoki, M; Komine, Ryuji; Ito, Takushi; Hasebe, Shinichi; Kato, Shoichi; Koi, Mamoru; Wada, Yusaku
PNC TN9410 93-142, 120 Pages, 1993/06
Much progress has been made in improving established creep properties of Type 316 stainless steel and to develop a new structural material named "FBR Grade Type 316 Stainless Steel", 316FR, with superior creep properties. This report includes a draft of Material Strength Standard of 316FR and its interpretation on the basis of the major result of research and development conducted so far. The draft includes identical items described in the "Standards for the Strength of Materials" for Monju, and was carefully prepared to have an identical style for convenience in design evaluation. Creep damage evaluation diagrams, which are depicted in the "Structural Design Guide for Class 1 Components of Prototype Fast Breeder Reactor for Elevated Temperature Service" (ETSDG) for individual materials, are also included in this report.
Takahashi, Toru; Kato, Shoichi; Nakagiri, Toshio; Aoto, Kazumi
no journal, ,
no abstracts in English
