Proceedings of the

The 33rd European Safety and Reliability Conference (ESREL 2023)
3 – 8 September 2023, Southampton, UK

External Probability Safety Assessment Framework

HyungJun Kima and Seung Jun Leeb

Department of Nuclear Engineering, Ulsan National Institute of Science and Technology, Republic of Korea.


Considering the climate change, a new analysis is needed for external events related to natural disasters on nuclear power plants. In the case of extreme natural disasters such as tsunamis and earthquakes, the consequences of accidents will be very serious. After screening and analysing the natural disasters affecting the nuclear power plant, the nuclear power plant structure and components affected by the selected natural disasters are derived through the nuclear power plant walkdown. After the failure mode and effect analysis of the derived component is performed, the initial event analysis is performed by referring to the internal event PSA(Probabilistic Safety Assessment Framework). It is necessary to analyse the accident scenario according to each initiating event. In addition, hazard and fragility analysis is performed on the screening component.

Keywords: Probabilistic safety assessment framework, Extreme external event, Risk assessment, Natural hazard.

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