[3G01-05] Risk Evaluation Method

[3G03] Risk assessment for various cohorts considering EAL transmission timing

*Fumie Sebe¹, Hideki Horie¹, Nobuhisa Takezawa¹, Mika Tahara¹, Kaoru Matsushita¹ (1. Toshiba Energy Systems & Solutions Corporation)

Keywords:Level 3 PRA, WinMACCS, Cohort, EAL, Exposure, Evacuation

When a nuclear power plant (NPP) accident occurs in Japan, residents evacuate according to an evacuation planning established by local authorities based on nuclear emergency response guideline. Emergency action level (EAL) that triggers evacuation is transmitted according to the plant condition, but the time from that transmission to the release of radioactive materials varies depending on the accident scenario. Therefore, it is important to integrate on-site and off-site information against the most important residents’ risk assessment. In this study, an analysis of radiation effects was performed for typical evacuees’ attribute (cohort) with setting the EAL transmission timing for each cohort based on the NPP accident progression analyses. As a result, the effectiveness of the evacuation planning could be evaluated.