Evaluating and modeling of an event diagnosis failure in PSA

Event diagnosis after a reactor trip is very important for plant safety in a nuclear power plant. However, the current human reliability analysis (HRA) does not appropriately evaluate the effect of such a diagnosis failure to the plant safety. This paper shows, based on a simulation study, the potential for a diagnosis failure is much higher than what we expect. This paper summarizes the analysis results of the study, the performance time of an event diagnosis and the potential of a diagnosis failure