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Fujimoto, Nozomu; Nakano, Masaaki*; Takeuchi, Mitsuo; Fujisaki, Shingo; Yamashita, Kiyonobu
Nihon Genshiryoku Gakkai-Shi, 42(5), p.458 - 464, 2000/05
Times Cited Count：6 Percentile：42.14(Nuclear Science & Technology)no abstracts in English
Yamashita, Kiyonobu; Fujimoto, Nozomu; Takeuchi, Mitsuo; Fujisaki, Shingo; Nakano, Masaaki*; Umeta, Masayuki; Takeda, Takeshi; Mogi, Haruyoshi; Tanaka, Toshiyuki
Nihon Genshiryoku Gakkai-Shi, 42(1), p.30 - 42, 2000/01
Times Cited Count：3 Percentile：26.24(Nuclear Science & Technology)no abstracts in English
Tanaka, Toshiyuki; Shiozawa, Shusaku; Okubo, Minoru; Fujikawa, Seigo; Mogi, Haruyoshi; Suzuki, Hiroshi
Proceedings of European Nuclear Conference (ENC'98), 4, 5 Pages, 1998/00
no abstracts in English
Yamashita, Kiyonobu; Ando, Hiroei; Nojiri, Naoki; Fujimoto, Nozomu; Nakata, Tetsuo*; Watanabe, Takashi*; Yamane, Tsuyoshi; Nakano, Masaaki*
Proc. of SARATOGA 1997, 2, p.1557 - 1566, 1997/00
no abstracts in English
Yamane, Yuichi; Tonoike, Kotaro
no journal, ,
After the accident of Fukushima Dai-ichi Nuclear Power Station, there is still damaged nuclear fuel in the reactor buildings, which is called fuel debris and contains an amount of fissile materials more than the minimum criticality amount. A new method, which has been developed by Japan Atomic Energy Agency to technically support the Nuclear Regulatory Authority in Japan, NRA, is designed to estimate criticality risk based on a probability distribution of k-eff due to uncertainty of composition and geometry of fuel debris, which method will provide risk information for the criticality safety of fuel debris. A trial analysis by using the procedure defined in the method shows that some events which can initiate criticality can be supposed to happen during maintenance period, and that analysis also indicates countermeasures should be considered as soon as possible in order to reduce criticality risk for public and workers.
