Multi-unit Level 2 probabilistic safety assessment: Approaches and their application to a six-unit nuclear power plant site

The risk of multi-unit nuclear power plants (NPPs) at a site has received considerable critical attention recently. However, current probabilistic safety assessment (PSA) procedures and computer code do not support multi-unit PSA because the traditional PSA structure is mostly used for the quantific...

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Bibliographic Details
Published inNuclear engineering and technology Vol. 50; no. 8; pp. 1234 - 1245
Main Authors Cho, Jaehyun, Han, Sang Hoon, Kim, Dong-San, Lim, Ho-Gon
Format Journal Article
LanguageKorean
Published 2018
Subjects
Large Early Release Frequency
Level 2 Probabilistic Safety Assessment
Tsunami Event
Seismic Event
Site Containment Failure Probability
Site Risk
Method
Multi-unit Probabilistic Safety Assessment
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Summary:The risk of multi-unit nuclear power plants (NPPs) at a site has received considerable critical attention recently. However, current probabilistic safety assessment (PSA) procedures and computer code do not support multi-unit PSA because the traditional PSA structure is mostly used for the quantification of single-unit NPP risk. In this study, the main purpose is to develop a multi-unit Level 2 PSA method and apply it to full-power operating six-unit OPR1000. Multi-unit Level 2 PSA method consists of three steps: (1) development of single-unit Level 2 PSA; (2) extracting the mapping data from plant damage state to source term category; and (3) combining multi-unit Level 1 PSA results and mapping fractions. By applying developed multi-unit Level 2 PSA method into six-unit OPR1000, site containment failure probabilities in case of loss of ultimate heat sink, loss of off-site power, tsunami, and seismic event were quantified.
Bibliography:KISTI1.1003/JNL.JAKO201815540676544
ISSN:1738-5733
2234-358X