Journal
NUCLEAR ENGINEERING AND TECHNOLOGY
Volume 50, Issue 8, Pages 1234-1245Publisher
KOREAN NUCLEAR SOC
DOI: 10.1016/j.net.2018.04.005
Keywords
Large Early Release Frequency; Level 2 Probabilistic Safety Assessment Method; Multi-unit Probabilistic Safety Assessment; Seismic Event; Site Containment Failure Probability; Site Risk; Tsunami Event
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Funding
- National Research Foundation of Korea (NRF) - Korean government (MSIT: Ministry of Science and ICT) [2017M2A8A4015287]
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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. (C) 2018 Korean Nuclear Society, Published by Elsevier Korea LLC.
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