Identification of Risk-Significant Components in Nuclear Power Plants to Reduce Cs-137 Radioactive Risk

Jaehyun Cho and Sang Hoon Han

Reliability Engineering and System Safety, 2021, vol. 211, issue C

Abstract: The amount and frequency of Cs-137 release in a nuclear accident are regulated to enhance environmental radiation protection. While significant improvements have been accomplished, including the preparation of severe accident mitigation equipment and systems to satisfy Cs-137 regulations, no attempt has yet been made along these lines to manage the structures, systems and components (SSCs) in nuclear power plants. Therefore, this paper proposes a new approach to identify the significant SSCs by quantifying related risk importance measures using release frequency and Cs-137 radioactivity. The new approach includes a Level 1 and Level 2 probabilistic safety assessment (PSA) linked model to obtain the frequency and Cs-137 radioactivity in all accident scenarios. The developed approach was applied to an OPR-1000 full-power internal events PSA model, and as a result, the top 20 SSCs were identified based on Fussell–Vesely importance, risk reduction worth, and risk achievement worth measures. The new approach can support risk-informed management for not only Cs-137 regulations but also public risk by using early and latent cancer fatalities.

Keywords: Probabilistic safety assessment; Minimal cut set; Basic event; Risk importance measure; Fussell–Vesely; Risk achievement worth; Cs-137 (search for similar items in EconPapers)
Date: 2021
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Citations: View citations in EconPapers (3)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:reensy:v:211:y:2021:i:c:s0951832021001587

DOI: 10.1016/j.ress.2021.107613

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