Development of the KAERI FEP, scenario, and assessment method database for permanent disposal of HLW in Korea

To develop the scenarios of radionuclide release after the closure of a deep geological repository in Korea, the Features, Events and Processes (FEPs) are collected. Based on the screening procedures with expert opinions, important FEPs are identified. FEPs are then classified into base and probabilistic ones. Base FEPs create the base scenarios and probabilistic FEPs create the alternative scenarios. Combining these FEPs into integrated FEPs (IFEPs) turns out to easily construct the RES matrix. After an RES matrix is developed, a scenario is developed for each corresponding RES matrix. Then assessment context and a flow chart are developed to be used for the total system performance assessment.