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Sakamaki, Keiko; Otsuka, Ichiro*; Iida, Yoshihisa; Inada, Daisuke*; Kamoshida, Michio; Kataoka, Masaharu; Yamaguchi, Tetsuji; Tanaka, Tadao
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no abstracts in English
Maeda, Toshikatsu; Omori, Hiroyuki; Yamaguchi, Tetsuji; Kataoka, Masaharu; Bamba, Tsunetaka*
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no abstracts in English
Mukai, Masayuki; Kataoka, Masaharu; Takeda, Seiji; Maeda, Toshikatsu; Iida, Yoshihisa; Watanabe, Masatoshi; Sawaguchi, Takuma; Yamaguchi, Tetsuji; Tanaka, Tadao
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Systematic safety assessment should be carried out taking into account linkage among "Condition Setting", "Safety Function", and "Radionuclide Migration". We have summarized input-output relation among a calculation code coupled mass transport and chemical reaction, models to evaluate performance of each of engineered barriers, and a safety assessment code through the viewpoint of the linkage. As the first step to establish a systematic safety assessment methodology, how to specifically link those codes and models and how to apply a linked calculation process to practical cases of geological disposal conditions have been discussed.
Sato, Haruo; Niizato, Tadafumi; Tanaka, Shingo; Abe, Hironobu; Aoki, Kazuhiro
no journal, ,
An accident of Fukushima Dai-ichi Nuclear Power Station, TEPCO occurred by the 2011 off the Pacific coast of Tohoku Earthquake on 11 March, 2011. Part of the radionuclides in atomic reactors was released and accumulated on soil surface etc. over the wide range of area in Fukushima Prefecture. This work was carried out as one of the researches relating to distribution maps of radiation dose rate etc. which MEXT promotes, and investigation on the depth distribution of radionuclides in soil was carried out. Secondary investigation was conducted in February to March, 2012 after about 1 year from the accident following on the primary investigation in June, 2011 after 3 months from the accident. In the secondary investigation, soil core samples to maximum depth about 50 cm were obtained by a portable drilling kid and a large core sampler with an inner diameter of 15 cm. Investigation was carried out at the same points as previous investigation (totally 11 points). Cs-134 and 137 were detected in all investigation points, and Ag-110m was detected only in areas where spatial dose rate and the inventories of radionuclides have been evaluated to be high. Over 95% of Cs inventories existed within a depth of 5cm from surface except for soil at locations that are supposed to have been used as farmland and organic soil. Over 95% of Cs inventories existed within a depth of 16cm from surface for soil at locations that are supposed to have been used as farmland and organic soil. The concentration of Cs showed a tendency to distribute to deeper part in brown soil or black soil, and particularly showed a tendency to spread in organic soil. This is considered for an organic matter to check sorption of Cs to soil.
Tsukada, Manabu; Hoshino, Seiichi; Yamaguchi, Tetsuji; Sawaguchi, Takuma; Mukai, Masayuki; Maeda, Toshikatsu; Tanaka, Tadao
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no abstracts in English
Chiba, Noriaki; Maeda, Toshikatsu; Yamaguchi, Tetsuji
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no abstracts in English
Mori, Hideharu
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no abstracts in English
Kimura, Hideo
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no abstracts in English
Tanabe, Tsutomu
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no abstracts in English
Kurikami, Hiroshi
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In this presentation, temporary storage of wastes and lessons learned are focused.