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Yamashita, Toshiyuki; Kuramoto, Kenichi; Shirasu, Noriko; Nakano, Yoshihiro; Akie, Hiroshi; Nagashima, Hisao; Kimura, Yasuhiko; Omichi, Toshihiko*
Journal of Nuclear Materials, 320(1-2), p.126 - 132, 2003/07
Times Cited Count：10 Percentile：55.56(Materials Science, Multidisciplinary)Two irradiation tests on the rock-like oxide (ROX) fuels, small disk-shape fuel targets and pellet-type fuels, were performed in order to clarify in-pile irradiation stabilities. Swelling, fractional fission gas release (FGR) and phase change were examined by puncture test, profilometry and ceramography. YSZ single-phase fuel showed an excellent irradiation behavior, ie. low fission gas release (less than 3%), negligible swelling and no appreciable restructuring. The particle dispersed fuels showed lower swelling and higher fission gas release than those of mechanically blended fuels. Spinel decomposition and subsequence restructuring in the spinel matrix fuels was observed for the first time in the present investigation. It would be possible to reduce the FGR of the spinel matrix fuels, if the maximum fuels temperature is limited below 1700 K where neither spinel decomposition nor restructuring was observed. Damaged area of spinel matrix due to fission fragment irradiation seemed to be confined to thin layers around the surface of YSZ particles.
Omichi, Toshihiko*; Arai, Yasuo
Journal of Nuclear Science and Technology, 39(Suppl.3), p.156 - 159, 2002/11
no abstracts in English
O
and MgO irradiated with energetic iodine ionsAruga, Takeo; Katano, Yoshio*; Omichi, Toshihiko*; Okayasu, Satoru; Kazumata, Yukio*; Jitsukawa, Shiro
Nuclear Instruments and Methods in Physics Research B, 197(1-2), p.94 - 100, 2002/11
Times Cited Count：9 Percentile：50.57(Instruments & Instrumentation)no abstracts in English
O
, MgAlO and MgO irradiated with energetic iodine ionsAruga, Takeo; Katano, Yoshio*; Omichi, Toshihiko*; Jitsukawa, Shiro
Surface & Coatings Technology, 158-159, p.444 - 448, 2002/09
no abstracts in English
Nakajima, Kunihisa; Omichi, Toshihiko*; Arai, Yasuo
Journal of Nuclear Materials, 304(2-3), p.176 - 181, 2002/08
Times Cited Count：3 Percentile：22.77(Materials Science, Multidisciplinary)The oxygen potentials of two type urania-yttria solid solutions, one is the solid solution expressed as nearly U
Y
O
and the other is nearly stoichiometric solid solution, are investigated by use of a mass spectrometer combined with a Knudsen cell. The oxygen potentials for the nearly stoichiometric specimens are much higher than those for pure urania with similar stoichiometry. On the other hand, the oxygen potentials for fully reduced specimens almost agree with those for pure urania having the same oxygen deficiencis.
Yamashita, Toshiyuki; Kuramoto, Kenichi; Akie, Hiroshi; Nakano, Yoshihiro; Shirasu, Noriko; Nakamura, Takehiko; Kusagaya, Kazuyuki*; Omichi, Toshihiko*
Journal of Nuclear Science and Technology, 39(8), p.865 - 871, 2002/08
Times Cited Count：26 Percentile：81.73(Nuclear Science & Technology)Research on the plutonium rock-like oxide (ROX) fuels and their once-through burning in light water reactors has been performed to establish an option for utilizing and disposing effectively the excess plutonium. The ROX fuel is a sort of the inert matrix fuels and consists of mineral-like compounds such as yttria stabilized zirconia, spinel and corundum. A particle-dispersed fuel was devised to reduce damage by heavy fission fragments. Some preliminary results on swelling, fractional gas release and microstructure change for five ROX fuels were obtained from the irradiation test and successive post-irradiation examinations. Inherent disadvantages of the Pu-ROX fuel cores could be improved by adding 238U or 232Th as resonant materials, and all improved cores showed a nearly the same characteristics as the conventional UO2 core during transient conditions. The threshold enthalpy of the ROX fuel rod failure was found to be comparable to the fresh UO2 rod by pulse-irradiation tests simulating reactivity initiated accident conditions.
Nitani, Noriko; Kuramoto, Kenichi; Yamashita, Toshiyuki; Omichi, Toshihiko*
Progress in Nuclear Energy, 38(3-4), p.435 - 438, 2001/02
Times Cited Count：1 Percentile：11.82(Nuclear Science & Technology)no abstracts in English
Yamashita, Toshiyuki; Kuramoto, Kenichi; Akie, Hiroshi; Nakano, Yoshihiro; Nitani, Noriko; Nakamura, Takehiko; Kusagaya, Kazuyuki*; Omichi, Toshihiko*
Proceedings of Workshop on Advanced Reactors with Innovative Fuels (ARWIF 2001) (CD-ROM), 10 Pages, 2001/00
no abstracts in English
Aruga, Takeo; Katano, Yoshio; Omichi, Toshihiko; Okayasu, Satoru; Kazumata, Yukio
Nuclear Instruments and Methods in Physics Research B, 166-167, p.913 - 919, 2000/05
Times Cited Count：32 Percentile：86.36(Instruments & Instrumentation)no abstracts in English
Yanagisawa, Kazuaki; Omichi, Toshihiko*; Shirasu, Noriko; Yamashita, Toshiyuki; ; Onozawa, Atsushi; ; Kanazawa, Hiroyuki; Kanaitsuka, Fumio; Amano, Hidetoshi
JAERI-Tech 99-044, 46 Pages, 1999/05
no abstracts in English
Yanagisawa, Kazuaki; Omichi, Toshihiko*; Shirasu, Noriko; Muromura, Tadasumi;
JAERI-Tech 99-032, 65 Pages, 1999/03
no abstracts in English
Yanagisawa, Kazuaki; Omichi, Toshihiko*; Muromura, Tadasumi; ; Shirasu, Noriko
Journal of Nuclear Science and Technology, 36(2), p.160 - 168, 1999/02
Times Cited Count：4 Percentile：34.88(Nuclear Science & Technology)no abstracts in English
C.Degueldre*; Takano, Masahide; Omichi, Toshihiko; Fukuda, Kosaku; P.Heimgartner*; T.Graber*
JAERI-Research 97-087, 19 Pages, 1997/11
JAERI-Research-97-087.pdf:0.87MB
no abstracts in English
-ZrO(Y){or ThO}-AlO-MgO at burn-up of 20 MWd/kgYanagisawa, Kazuaki; Omichi, Toshihiko; Kanazawa, Hiroyuki; Amano, Hidetoshi; Yamahara, Takeshi
JAERI-Research 97-085, 31 Pages, 1997/11
JAERI-Research-97-085.pdf:2.38MB
no abstracts in English
; Kobayashi, Shinichi*; Shirasu, Noriko; Yamashita, Toshiyuki; Omichi, Toshihiko; Muromura, Tadasumi
JAERI-Research 97-083, 21 Pages, 1997/11
JAERI-Research-97-083.pdf:1.23MB
no abstracts in English
Muromura, Tadasumi; Yamashita, Toshiyuki; Omichi, Toshihiko; Akie, Hiroshi; Takano, Hideki
Proc. of 14th Int. Japan-Korea Seminar on Ceramics, p.127 - 131, 1997/00
no abstracts in English
Omichi, Toshihiko
JAERI-Review 96-008, 13 Pages, 1996/07
JAERI-Review-96-008.pdf:0.92MB
no abstracts in English
; Nakajima, Kunihisa; Iwai, Takashi; Omichi, Toshihiko;
JAERI-Research 95-027, 19 Pages, 1995/03
JAERI-Research-95-027.pdf:0.89MB
no abstracts in English
Arai, Yasuo; Omichi, Toshihiko
Journal of Solid State Chemistry, 115(1), p.66 - 70, 1995/02
Times Cited Count：1 Percentile：6.70(Chemistry, Inorganic & Nuclear)no abstracts in English
Ogawa, Toru; Omichi, Toshihiko; Maeda, Atsushi; Arai, Yasuo;
Journal of Alloys and Compounds, 224, p.55 - 59, 1995/00
Times Cited Count：24 Percentile：78.72(Chemistry, Physical)no abstracts in English
