Study on risk importance evaluation in dynamic PRA, 1; The Concept and measures of risk importance

Narukawa, Takafumi*; Takata, Takashi*; Zheng, X. ; Tamaki, Hitoshi ; Maruyama, Yu ; Takada, Tsuyoshi  

The dynamic probabilistic risk assessment (dynamic PRA) methodology explicitly treats the dynamics of event progression, enabling risk assessment that does not require predefined scenarios or success criteria. Based on these characteristics, from the perspective of risk triplet, we investigated the concept and measures of risk importance in dynamic PRA. Furthermore, the proposed importance measures were applied to a dynamic PRA to evaluate their effectiveness. This presentation reports the results of the investigation into the concept and measures of risk importance.