Dependence Analysis of Nuclear Power Plant Operators Based on HRA

Abstract

As an important part of probabilistic safety assessment (PSA), human reliability analysis (HRA) provides human error probabilities for assessing the risk of nuclear power plants (NPPs). Human reliability analysis (HRA) uses a systematic method to qualitatively and quantitatively assess the mechanism and probability of human error in order to assess the human contribution to the risks of NPPs. Dependence anslysis is an important part of HRA. Without dependency analysis, the result of human error probabilities may be over optimistic, which will lead to the underestimation of the safety risk level of the NPPs. Based on the feedback of human factor dependence from the experts review of level 1 PSA in NPPs. This paper summarized the technical insights of HRA dependence analysis, and used two dependence analysis methods to re-analyze the human factor dependence in the PSA model of nuclear power plant. In this paper, starting from the problem of human dependence raised by experts in the peer assessment of first-level PSA in power operation, some technical insights on human dependence were summarized in the analysis and discussion of the existing HRA dependence method. Meanwhile, the human dependence of power PSA was analyzed again by SPAR-H method and NUREG-1921 dependence method.