An Approach to Classify the Risk of Operating Nuclear Power Plants - Case Study: Neckarwestheim Unit 1 and Unit 2

摘要

A level-2 Probabilistic Safety Assessment (PSA) is an integrated approach to investigate the progression of severe accidents up to containment failure and release of radionuclides into the environment. The results of a standard level-2 PSA include the frequencies associated with various containment failure modes (release categories) along with the environmental release quantities for various radioisotopes (source terms). The extended level-2 PSA approach discussed in this paper merges the standard level-2 PSA results into an integral metric for risk assessment by estimating the integral risk of activity of radiological release to the immediate vicinity of the plant. Risk is defined as a product of the released activity and the release-category frequency, integrated over all possible release categories.