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Tokuhisa, Atsushi*; Arai, Junya*; Jochi, Yasumasa*; Ono, Yoshiyuki*; Kameyama, Toyohisa*; Yamamoto, Keiji*; Hatanaka, Masayuki*; Gerofi, B.*; Shimada, Akio*; Kurokawa, Motoyoshi*; et al.
Journal of Synchrotron Radiation, 20(6), p.899 - 904, 2013/11
Times Cited Count：5 Percentile：28.14(Instruments & Instrumentation)Takato, Kiyoto; Murakami, Tatsutoshi; Suzuki, Kiichi; Shibanuma, Kimikazu; Hatanaka, Nobuhiro; Yamaguchi, Bungo; Tobita, Yoshimasa; Shinozaki, Masaru; Iimura, Naoto; Okita, Takatoshi; et al.
JAEA-Technology 2013-026, 42 Pages, 2013/10
JAEA-Technology-2013-026.pdf:3.17MB
In order to cope with making a commercial fast reactor fuel burn-up higher, oxygen-to-metal (O/M) ratio in the fuel specification is designed to 1.95. As the test for the fabrication of such low O/M ratio pellets, two kinds of O/M ratio preparation tests of different reduction mechanism were done. In the first test, we evaluated the technology to prepare the O/M ratio low by annealing the sintered pellets in production scale. In addition, we know from past experience that O/M ratio of the sintered pellets can be reduced by residual carbon when the de-waxed pellets with high carbon content are sintered. Thus, in another test, the green pellets containing a large amount of organic additives were sintered and we evaluated the technology to produce the low O/M ratio sintered pellets by the reduction due to residual carbon. From the first test results, we found a tendency that the higher annealing temperature or the longer annealing time resulted in the lower O/M ratio. However, the amount of O/M ratio reduction was small and it is estimated that a substantial annealing time is necessary to prepare the O/M ratio to 1.95. It is considered that reducing O/M ratio by annealing was difficult because atmosphere gas containing oxygen released from pellets remained and the O/M ratio was changed to the value equilibrated with the gas having high oxygen potential. From another test results, it was confirmed that O/M ratio was reduced by the reduction due to residual carbon. We found that it was important to manage an oxygen potential of atmosphere gas in a sintering furnace low to reduce the O/M ratio effectively.
Ono, Takanori; Hatanaka, Nobuhiro; Okita, Takatoshi; Aono, Shigenori
JAEA-Technology 2012-042, 96 Pages, 2013/02
JAEA-Technology-2012-042.pdf:2.6MB
In January of 1993, plutonium dioxide powder was received from the reprocessing plant "La Hague" of COGEMA in France to Plutonium Fuel Production Facility (PFPF) of JAEA to use as feed powder of MOX fuel for FBR prototype "Monju". Since the plutonium dioxide powder was contained in COGEMA type canisters, the powder had to be rebottled from CCGEMA type canisters to JAEA type canisters which can be handled in the PFPF. Therefore feed powder rebottling equipment and temporary feed storage equipment were developed and installed in the PFPF. Rebottling work with their equipments was started from March of 1993 and completed in March of 2006. This report summarizes operating and maintenance experiences on feed powder rebottling equipment and temporary feed storage equipment. It's important to reflect the operating and maintenance experiences of the rebottling equipment into design of a new rebottling equipment for uranium-plutonium mixed oxide powder.
Murakami, Tatsutoshi; Suzuki, Kiichi; Hatanaka, Nobuhiro; Hanawa, Yukio; Shinozaki, Masaru; Murakami, Shinichi; Tobita, Yoshimasa; Kawasaki, Takeshi; Kobayashi, Yoshihito; Iimura, Naoto; et al.
JAEA-Technology 2008-017, 97 Pages, 2008/03
JAEA-Technology-2008-017.pdf:2.76MB
Low density MOX pellets for FBR "MONJU" have not been fabricated in Plutonium Fuel Fabricating Facility (PFPF) for these 9 years since completion of the first reload fuel for "MONJU" in 1995. In this period, about 60 % of machines in the pellet fabrication process of PFPF have been replaced with new ones, and fabrication of MOX pellets for "JOYO" has been continued using these machines. Concerning the feed MOX powders for "MONJU", the amount of decay heat has been increased with increase of accumulated Am-241 in this period. In addition, powder characteristic of recycled MOX powder which is one of feed powders, MH-MOX powder, UO
powder and recycled MOX powder, was significantly changed by replacing former processing machine used for scrap recycling with improved one. Using MOX powder with increased decay heat and recycled MOX powder processed by new machine, a series of low density MOX pellet fabrication tests were conducted to confirm pellet fabrication conditions for current pellet fabrication machines from October in 2004 to August in 2006. As a conclusion, it was confirmed that low density MOX pellets could be fabricated using these feed powders and replaced machines by adjusting pellet fabrication conditions adequately. This report summarizes the results of a series of low density MOX pellet fabrication tests.
根本 修直; 田村 健; 周治 愛之; 畑中 延浩; 平野 宏志; 永田 武光
南 明則*
JP, 2019-082129 Patent licensing information Patent publication (In Japanese)
【課題】迅速、簡便かつ効率的に行うことが可能な放射線防護マスクの汚染検出方法を提供する。 【解決手段】放射線防護マスクの汚染検出方法は、プレフィルタ治具の開口から露出したプレフィルタのα線放出核種捕集量MPREを、α線用サーベイメータで計測する捕集量計測ステップと、α線放出核種捕集量MPREと予め定められた上限値MMAXとを比較する第1比較ステップと、α線放出核種捕集量MPREが上限値MMAX未満の場合に、放射線防護マスクの汚染量が許容範囲内だと判定し、α線放出核種捕集量MPREが上限値MMAX以上の場合に、放射線防護マスクの汚染量が許容範囲を超えていると判定する第1判定ステップとを含む。
Takato, Kiyoto; Goto, Kenta; Yamamoto, Kazuya; Ichige, Hidekazu; Hatanaka, Nobuhiro; Murakami, Tatsutoshi
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no abstracts in English
Goto, Kenta; Takato, Kiyoto; Ono, Takanori; Ichige, Hidekazu; Hatanaka, Nobuhiro; Murakami, Tatsutoshi
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-ray radiation management at a MOX fuel facilityTamura, Ken; Hatanaka, Nobuhiro; Nemoto, Shuji; Kimura, Yasuhisa; Hirano, Hiroshi*; Kawasaki, Takashi
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Goto, Kenta; Hirooka, Shun; Horii, Yuta; Nakamichi, Shinya; Murakami, Tatsutoshi; Shibanuma, Kimikazu; Ono, Takanori; Yamamoto, Kazuya; Hatanaka, Nobuhiro; Okumura, Kazuyuki
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Suzuki, Kiichi; Murakami, Tatsutoshi; Aono, Shigenori; Hatanaka, Nobuhiro; Takano, Tatsuo
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Ichige, Hidekazu; Hatanaka, Nobuhiro; Iimura, Naoto; Okita, Takatoshi
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no abstracts in English
