PSA Application in UK HPR1000 Numerical Targets Evaluation

Abstract

As an important safety assessment tool, PSA plays a very important role in identifying the weak points in Nuclear Power Plants (NPP) design and optimizing plant design. Traditional PSA risk identification is mainly carried out from two dimensions: Core Damage Frequency (CDF) and Large Release Frequency (LRF). In the Generic Design Assessment (GDA) demonstration of UK HPR1000, As Low As Reasonably Practicable (ALARP) concept and Numerical Targets (NTs) are introduced, so the application scope of PSA is expanded. Risk contribution is identified not only from CDF and LRF dimensions, but also from on-site and off-site personnel radiation risk dimensions. Based on the expanded PSA application dimension, the safety level of nuclear power plants can be further improved. This study will give the methodology of PSA application in NTs 5∼9 evaluation, and the identified NPP weak points and related design improvement suggestions of UK HPR1000.