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Probabilistic Safety Assessment of twin-unit nuclear sites: Methodological elements

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  • Le Duy, Tu Duong
  • Vasseur, Dominique
  • Serdet, Emmanuel

Abstract

When assessing the risk related to Nuclear Power Plants in terms of impacts on the population health and on the environment, multi units issues should be taken into account. Generally speaking, to date mainly models relating to a single unit have been developed by operators. The purpose of this paper is to present possible solutions or methodological options, suggested by EDF (Electricity of France) R&D, in order to switch from a risk assessment for the unit to a risk assessment for the site. The case of a site with two units is addressed here. A review of practices and standards showed that the specific aim of a PSA at site level was to deal with the dependencies existing between the units on that site. The risk calculation for the site is therefore proposed for six configurations resulting from the combination of two types of scenarios and three types of systems which are defined. The treatment of CCF events and the adaption of the assessment of the Human Errors Probabilities to the case of multiple units are also addressed in this paper. The proposed approach is illustrated using a simplified case inspired by the EDF 900MWe units level 1 PSA model.

Suggested Citation

  • Le Duy, Tu Duong & Vasseur, Dominique & Serdet, Emmanuel, 2016. "Probabilistic Safety Assessment of twin-unit nuclear sites: Methodological elements," Reliability Engineering and System Safety, Elsevier, vol. 145(C), pages 250-261.
    • Handle: RePEc:eee:reensy:v:145:y:2016:i:c:p:250-261
    DOI: 10.1016/j.ress.2015.07.014
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    Citations

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    Cited by:

    1. Kim, Dong-San & Park, Jin Hee & Lim, Ho-Gon, 2020. "A pragmatic approach to modeling common cause failures in multi-unit PSA for nuclear power plant sites with a large number of units," Reliability Engineering and System Safety, Elsevier, vol. 195(C).
    2. Arigi, Awwal Mohammed & Park, Gayoung & Kim, Jonghyun, 2020. "Dependency analysis method for human failure events in multi-unit probabilistic safety assessments," Reliability Engineering and System Safety, Elsevier, vol. 203(C).
    3. Zhou, Taotao & Modarres, Mohammad & Droguett, Enrique López, 2021. "Multi-unit nuclear power plant probabilistic risk assessment: A comprehensive survey," Reliability Engineering and System Safety, Elsevier, vol. 213(C).
    4. Le Duy, Tu Duong & Vasseur, Dominique, 2018. "A practical methodology for modeling and estimation of common cause failure parameters in multi-unit nuclear PSA model," Reliability Engineering and System Safety, Elsevier, vol. 170(C), pages 159-174.
    5. Zhang, Sai & Du, Mengyu & Tong, Jiejuan & Li, Yan-Fu, 2019. "Multi-objective optimization of maintenance program in multi-unit nuclear power plant sites," Reliability Engineering and System Safety, Elsevier, vol. 188(C), pages 532-548.
    6. Yoon, Jae Young & Kim, Dong-San, 2022. "Estimating the adverse effects of inter-unit radioactive release on operator actions at a multi-unit site," Reliability Engineering and System Safety, Elsevier, vol. 228(C).

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