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Takeda, Seiji; Yamaguchi, Tetsuji; Nagasawa, Hirokazu; Watanabe, Masatoshi; Sekioka, Yasushi; Kanzaki, Yutaka; Sasaki, Toshihisa; Ochiai, Toru; Munakata, Masahiro; Tanaka, Tadao; et al.
JAEA-Research 2009-034, 239 Pages, 2009/11
JAEA-Research-2009-034.pdf:33.52MB
In safety assessment for geological disposal of high level radioactive waste, it is of consequence to estimate the uncertainties due to the long-term frame associated with long-lived radionuclides and the expanded geological environment. The uncertainties result from heterogeneity intrinsic to engineered and natural barrier materials, insufficient understanding of phenomena occurring in the disposal system, erroneous method of measurement, and incomplete construction. It is possible to quantify or to reduce the uncertainties according to scientific and technological progress. We applied a deterministic and a Monte Carlo-based probabilistic method simulation techniques to the uncertainty analysis for performance of hypothetical geological disposal system for high level radioactive waste. This study provides the method to evaluate the effects of the uncertainties with respect to scenarios, models and parameters in engineering barrier system on radiological consequence. The results also help us to specify prioritized models and parameters to be further studied for long-term safety assessment.
Kanzaki, Yutaka; Takeda, Seiji; Kimura, Hideo
JAEA-Data/Code 2009-011, 90 Pages, 2009/09
JAEA-Data-Code-2009-011.pdf:4.76MB
Scenario description is the first and essential step in the safety assessment of geologic disposal of radioactive waste. Scenarios are constructed considering factors that are likely to affect long-term safety of disposal. Recent safety assessment studies employ the "FEP" approach, where scenarios are constructed based on comprehensive information on features, events and processes (FEPs) occurring in the disposal system. We began choosing FEPs from the internationally common OECD/NEA FEP database. Then we added scientific and technical information on the chosen FEPs obtained through comprehensive. The correlations were scrutinized to select finally critical safety correlations, which became elements integrated to safety assessment scenarios. This report provides aforementioned FEP-related database and illustrates the scenario construction procedure for the groundwater transporting radionuclide scenario.
Kanzaki, Yutaka; Takeda, Seiji; Kimura, Hideo
no journal, ,
no abstracts in English
Kanzaki, Yutaka; Takeda, Seiji; Kimura, Hideo
no journal, ,
no abstracts in English