FEP database for scenario construction on groundwater migration in safety assessment for a geological disposal of high-level radioactive waste (Contract research)

Kanzaki, Yutaka; Takeda, Seiji ; Kimura, Hideo

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.