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Aghamiri, S. M. S.*; Sowa, Takashi*; Ukai, Shigeharu*; Ono, Naoko*; Sakamoto, Kan*; Yamashita, Shinichiro
Materials Science & Engineering A, 771, p.138636_1 - 138636_12, 2020/01
Times Cited Count：33 Percentile：90.54(Nanoscience & Nanotechnology)Oxide dispersion strengthened (ODS) FeCrAl ferritic steels are being developed as potential accident tolerance fuel cladding materials for the light water reactors (LWRs) due to significant improvement in steam oxidation by alumina forming scale and good mechanical properties up to high temperatures. In this study, the microstructural characteristics and tensile properties of the two FeCrAl ODS cladding tubes with different extrusion temperatures of 1100
C and 1150C were investigated during processing conditions. While the hot extruded sample showed micron sized elongated grains with strong 
-fiber in 
110
texture, cold pilger rolling process change the microstructure to submicron/micron size grain structure along with texture evolution to both -fiber (110 texture) and 
-fiber ({111} texture) via crystalline rotations. Subsequently, final annealing resulted in evolution of microstructure to large grain recrystallized structure starting at recrystallization temperature of 
810-850C. Two distinct texture development happened in recrystallized cladding tubes, i.e., only large elongated grains of (110) 211 texture following extrusion temperature of 1100C; and two texture components of (110) 211 and {111} 112 following higher extrusion temperature of 1150C. The different texture development and retarding of recrystallization progress in 1100C-extruded cladding tubes were attributed to higher distribution of oxide particles.
Yang, S.*; Katsumura, Yosuke*; Yamashita, Shinichi*; Matsuura, Chihiro*; Hiroishi, Daisuke*; Lertnaisat, P.*; Taguchi, Mitsumasa
Radiation Physics and Chemistry, 123, p.14 - 19, 2016/06
Times Cited Count：2 Percentile：19.57(Chemistry, Physical)-radiolysis of boiling water has been investigated. The G-value of H
evolution was found to be very sensitive to the purity of water. In high-purity water, both H and O gases were formed in the stoichiometric ratio of 2:1; a negligible amount of HO remained in the liquid phase. The G-values of H and O gas evolution depend on the dose rate: lower dose rates produce larger yields. To clarify the importance of the interface between liquid and gas phase for gas evolution, the gas evolution under Ar gas bubbling was measured. A large amount of H was detected, similar to the radiolysis of boiling water. The evolution of gas was enhanced in a 0.5 M NaCl aqueous solution. Deterministic chemical kinetics simulations elucidated the mechanism of radiolysis in boiling water.
Idesaki, Akira; Morishita, Norio; Ito, Hisayoshi; Kamiya, Tomihiro; Nakamoto, Tatsushi*; Kimura, Nobuhiro*; Makida, Yasuhiro*; Ogitsu, Toru*; Ohata, Hirokatsu*; Yamamoto, Akira*
AIP Conference Proceedings 824, p.330 - 334, 2006/03
Polyimide films and glass fiber reinforced plastics (GFRPs) are used as insulating or structural materials for superconducting magnets in a neutrino beam line of the Japan Proton Accelerator Research Complex (J-PARC). It is indispensable to evaluate radiation resistance of these materials, because they are required to keep their electrical and mechanical properties in a high radiation field of 30 kGy/year at low temperature of 4 K. In this work, the gas evolution resulting from chemical reactions induced in the polyimide films and GFRPs by ray irradiation at 77 K was investigated. It was found that the main component of the evolved gas is hydrogen. The amount of hydrogen evolved from the superconducting magnet system used in the neutrino beam line was estimated to be 0.37 mol/year (0.01 L/year as the volume of liquid hydrogen). It indicates that the hydrogen evolved from the organic materials does not influence on the operation of the helium purifying system.
Konovalov, S. V.; Mikhailovskii, A. B.*; Ozeki, Takahisa; Takizuka, Tomonori; Shirokov, M. S.*; Hayashi, Nobuhiko
Plasma Physics and Controlled Fusion, 47(12B), p.B223 - B236, 2005/12
Times Cited Count：7 Percentile：24.58(Physics, Fluids & Plasmas)Neoclassical Tearing Modes, NTMs, are known to limit the maximum attainable plasma pressure, degrade confinement and, at worst, culminate in disruption of the tokamak discharges. Key role in NTM evolution belongs to the radial profiles of the plasma flow, temperature and density which are determined by the conjunction of the longitudinal and cross-filed transport arising from thermal conduction, particle diffusion, and viscosity. In this report the influence of anomalous perpendicular heat transport and anomalous ion perpendicular viscosity on early stage of the NTM evolution is studied theoretically.
Endo, Akira; Yamaguchi, Yasuhiro; Sumita, Kenji*
Journal of Nuclear Science and Technology, 40(8), p.628 - 630, 2003/08
Times Cited Count：4 Percentile：31.59(Nuclear Science & Technology)no abstracts in English
Kai, Tetsuya; Maekawa, Fujio; Kasugai, Yoshimi; Niita, Koji*; Takada, Hiroshi; Meigo, Shinichiro; Ikeda, Yujiro
Proceedings of ICANS-XVI, Volume 3, p.1041 - 1049, 2003/07
A radioactivity calculation code system DCHAIN-SP was validated in view of the following points: (1) Activation cross section data library for the energy region below 20 MeV. (2) NMTC/JAM code for calculation of the nuclide yield induced by the high energy particles above 20 MeV. (3) DCHAIN-SP code system which treats overall nuclide yield by the high energy particles. 42 of activation cross sections and 22 tritium production cross sections were revised so that the DCHAIN-SP calculation could improve its accuracy within 30% for typical materials irradiated by 14-MeV neutrons. The NMTC/JAM code was improved to implement the GEM model for better estimation of light fragment production. Accuracy of the nuclide yield for proton induced reactions in 10 MeV - 10 GeV still remains in the level of a factor of 2 to 3. The DCHAIN-SP code system was employed for the analysis of time evolution of the radioactivity produced in the samples on a thick mercury target bombarded with 2.83 and 24 GeV protons. It is found that the code system agrees with the measured data by a factor of 2 to 3.
Haruyama, Yasuyuki; Sunaga, Hiromi; Arakawa, Kazuo; Seguchi, Tadao
JAERI-Tech 2002-084, 105 Pages, 2002/11
JAERI-Tech-2002-084.pdf:2.01MB
no abstracts in English
Wan, C.*; Motohashi, Yoshinobu*; Shibata, Taiju; Baba, Shinichi; Ishihara, Masahiro; Hoshiya, Taiji
Journal of Iron and Steel Research, International, Special Issue IFAMST, p.85 - 89, 2002/06
no abstracts in English
; *; Kikuchi, Kenji; ; Miura, Takayuki*
Proc. of 4th Int. Conf. on Recrystallization and Related Phenomena (REX'99), p.283 - 288, 1999/00
no abstracts in English
Hoshi, Tatsuo
Nihon Genshiryoku Gakkai-Shi, 38(3), p.216 - 218, 1996/00
no abstracts in English
Seguchi, Tadao
Hoshasen To Sangyo, 0(66), p.4 - 8, 1995/00
no abstracts in English
Seguchi, Tadao; Sugimoto, Masaki*; Okamura, K.*
High Temperature Ceramic Matrix Composites; 6th European Conf. on Composite Materials: HT-CMC, p.51 - 57, 1993/00
no abstracts in English
*; *; *; Yagi, Toshiaki; Seguchi, Tadao
Proc. on the Electrical Electronics Insulation Conf. and Electrical Manufacturing & Coil Winding Conf., p.703 - 706, 1993/00
no abstracts in English
Seguchi, Tadao; Kasai, Noboru; Okamura, K.*
Proceedings of the International Conference on Evolution in Beam Applications, p.702 - 706, 1992/00
no abstracts in English
*; Nishii, Masanobu; Seguchi, Tadao; *; *
Radiation Physics and Chemistry, 37(2), p.213 - 216, 1991/00
no abstracts in English
Arakawa, Kazuo
Journal of Polymer Science, Part A-1, 25, p.1713 - 1716, 1987/00
no abstracts in English
Arakawa, Kazuo; Seguchi, Tadao; Yoshida, Kenzo
Radiation Physics and Chemistry, 27(2), p.157 - 163, 1986/00
no abstracts in English
*; Seguchi, Tadao
EIM-85-155, p.19 - 30, 1985/00
no abstracts in English
Arakawa, Kazuo; Seguchi, Tadao; Hayakawa, Naohiro; Machi, Sueo
Journal of Polymer Science; Polymer Chemistry Edition, 21, p.1173 - 1181, 1983/00
no abstracts in English
Arakawa, Kazuo; Nakanishi, Hiroshi*; Hayakawa, Naohiro
Nucl.Techonl., 61, p.533 - 539, 1983/00
Times Cited Count：2 Percentile：35.11(Nuclear Science & Technology)no abstracts in English
