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Tsujimura, Seiichi; Funabashi, Hideyuki; Ishibashi, Makoto*; Takase, Toshio*; Kurosawa, Mitsuru*
JAEA-Research 2007-030, 105 Pages, 2007/03
JAEA-Research-2007-030.pdf:7.72MB
Uranium waste has characteristics that it is rarely expected to decay its radioactivity and it is not almost recessary to consider external exposure to radiation from waste package. We studied resonable sub-surface disposal concepts for uranium waste considering the characteristics. It showed feasibility of this system. In 2006, the study was done to evaluate the correlation between dose to the public and the parameter in consideration of the uncertainty of the parameter by comprehensive sensitivity analysis calculating repeatedly dose with the data sets by random sampling in parameter ranges given adequately, because last year's study was an evaluation intended for a limited site. The result was that two parameters, "flow velocity of underground water of repository neighborhood" and "distribution coefficient of uranium in natural barrier", had correlation with dose to the public.
Tsujimura, Seiichi; Funabashi, Hideyuki; Ishibashi, Makoto*; Takase, Toshio*; Kurosawa, Mitsuru*
JAEA-Research 2006-029, 96 Pages, 2006/07
JAEA-Research-2006-029.pdf:3.97MB
Uranium waste has characteristics that it is rarely expected to decay its radioactivities and it is not almost necessary to consider external exposure to radiation from waste package. We studied reasonable sub-surface disposal concepts for uranium waste in 2004 and 2005 considering the characteristics. In 2005, we studied necessity of engineered barrier for the disposal of uranium waste, considering change of chemical condition around disposal facilities over long periods of time. Safety assessment was made to analyze effect of difference in sorption parameters at reduction and oxidation conditions. The assessment showed that change from reduction to oxidation around disposal facilities did not lead to increase dose to the public. The assessment with realistic sorption parameters showed that dose to the public was not more than 10 
Sv/y. The results proved that it was not necessary to keep reduction conditions around disposal facilities. This two-year- study showed that there was possibility of sub-surface disposal system without engineered barrier for uranium waste.
Onozuka, Masanori*; Tsujimura, Seiichi*; Toyoda, Masahiko*; Inoue, Masahiko*; Abe, Tetsuya; Murakami, Yoshio
Fusion Technology 1994, Vol.1, p.803 - 806, 1995/00
no abstracts in English
Kasai, Satoshi; Hasegawa, Koichi; Oda, Yasushi*; Onozuka, Masanori*; Suzuki, Sadaaki; Miura, Yukitoshi; Tsujimura, Seiichi*
JAERI-M 92-143, 40 Pages, 1992/09
no abstracts in English
Kawatsuma, Shinji; Funabashi, Hideyuki; Yagi, Naoto; Kudo, Kenji; Tsujimura, Seiichi; Fukushima, Tadashi
no journal, ,
no abstracts in English
Tsujimura, Norio; Yoshida, Tadayoshi; Yamada, Maromu*; Takaya, Mitsutoshi*; Kanno, Seiichiro*; Shinohara, Yasushi*; Nakamura, Kenji*; Koda, Shigeki*
no journal, ,
no abstracts in English
