Experience from Level 2 Site Risk Analysis for Nordic Power Plants

Jan-Erik Holmberg, Stefan Authén, Ola Bäckström, He Xuhong, Salvatore Massaiu, Tero Tyrväinen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

The objective with the SITRON (SITe Risk On Nuclear installations) project has been to search for practical approaches for Nordic utilities to assess the site level risk. This paper presents the findings from the performance of level 2 PSA, i.e., the assessment of radioactive release risk from multiple units. Qualitatively, a multi-unit level 1 and 2 PSA are similar in terms of identifying dependencies. Level 2 PSA may bring some additional dependencies that are not relevant for level 1 PSA. Quantitatively, the difference in the used risk metrics can have some practical implications. In level 1 PSA, risk metrics are the frequencies of combinations of core damages (one, two, ..., all units). In level 2 PSA, risk metric is the frequency of a certain release category (small, large, early, late), which is determined by the aggregated release rather than number of releases. The need to quantify various accident sequences is thus much dependent on the applied safety goal for level 2 PSA. Further, pilot studies indicate that inter-unit dependencies in level 2 safety functions have less influence on results than inter-unit dependencies in level 1 safety functions.
Original languageEnglish
Title of host publicationProceedings of the 29th European Safety and Reliability Conference, ESREL 2019
EditorsMichael Beer, Enrico Zio
Place of PublicationSingapore
PublisherEuropean safety and reliability association
Pages3790-3797
Number of pages8
ISBN (Electronic)978-981-11-2724-3
DOIs
Publication statusPublished - Sep 2019
MoE publication typeA4 Article in a conference publication
Event29th European Safety and Reliability Conference, ESREL 2019 - Welfenschloss, Hannover, Germany
Duration: 22 Sep 201926 Sep 2019
https://esrel2019.org/#/

Conference

Conference29th European Safety and Reliability Conference, ESREL 2019
CountryGermany
CityHannover
Period22/09/1926/09/19
Internet address

Keywords

  • site risk analysis
  • nuclear power plant
  • level 2 PSA
  • probabilistic safety assessment
  • probabilistic risk analysis
  • multi-unit
  • severe accident
  • risk metrics
  • human reliability analysis

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  • Cite this

    Holmberg, J-E., Authén, S., Bäckström, O., Xuhong, H., Massaiu, S., & Tyrväinen, T. (2019). Experience from Level 2 Site Risk Analysis for Nordic Power Plants. In M. Beer, & E. Zio (Eds.), Proceedings of the 29th European Safety and Reliability Conference, ESREL 2019 (pp. 3790-3797). [0276] European safety and reliability association. https://doi.org/10.3850/978-981-11-2724-3_0276-cd