[논문]Direct fault-tree modeling of human failure event dependency in probabilistic safety assessment

Ji Suk Kim; Sang Hoon Han; Man Cheol Kim

doi:10.1016/j.net.2022.08.029

Direct fault-tree modeling of human failure event dependency in probabilistic safety assessment 원문보기

Nuclear engineering and technology : an international journal of the Korean Nuclear Society, v.55 no.1, 2023년, pp.119 - 130

Ji Suk Kim (Department of Energy Systems Engineering, Chung-Ang University) , Sang Hoon Han (Risk and Reliability Research Team, Korea Atomic Energy Research Institute) , Man Cheol Kim (Department of Energy Systems Engineering, Chung-Ang University)

Abstract ▼ AI-Helper

Among the various elements of probabilistic safety assessment (PSA), human failure events (HFEs) and their dependencies are major contributors to the quantification of risk of a nuclear power plant. Currently, the dependency among HFEs is reflected using a post-processing method in PSA, wherein several drawbacks, such as limited propagation of minimal cutsets through the fault tree and improper truncation of minimal cutsets exist. In this paper, we propose a method to model the HFE dependency directly in a fault tree using the if-then-else logic. The proposed method proved to be equivalent to the conventional post-processing method while addressing the drawbacks of the latter. We also developed a software tool to facilitate the implementation of the proposed method considering the need for modeling the dependency between multiple HFEs. We applied the proposed method to a specific case to demonstrate the drawbacks of the conventional post-processing method and the advantages of the proposed method. When applied appropriately under specific conditions, the direct fault-tree modeling of HFE dependency enhances the accuracy of the risk quantification and facilitates the analysis of minimal cutsets.

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참고문헌 (23)

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Direct fault-tree modeling of human failure event dependency in probabilistic safety assessment 원문보기

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