Human Reliability Analysis in Probabilistic Safety Assessment of Multi-unit Nuclear Power Plants under External Impact

The Latest assault on Zaporizhzhia nuclear power plant in Ukraine drew worldwide attention on nuclear safety of nuclear power plants under external impact. Nowadays, most power plants around world combine multiple units, and nuclear safety concerns severe accidents in multi-unit sites. Under heavy external impact, reactors safety relates a lot to performance and decision-making of operators along with related organization and work devices. This complicated problem can be analyzed and predicted through probabilistic safety assessment which is widely practiced in nuclear power plants. In this paper, an approach to calculate core damage rates considering human reliability effect among units under external impact was brought up, which also presents a practical way to analyze similar scenarios.