Development of methods for risk follow-up and handling of CCF events in PSA applications

Jan-Erik Holmberg, Per Hellström

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

Abstract

Risk follow-up aims at analysis of operational events from their risk point of view using probabilistic safety assessment (PSA) as the basis. Risk follow-up provides additional insight to operational experience feedback compared to deterministic event analysis. Even though this application of PSA is internationally widely spread and tried out for more than a decade at many nuclear power plants, there are several problematic issues in the performance of a retrospective risk analysis as well as in the interpretation of the results. An R&D project sponsored by the Nordic PSA group (NPSAG) has focused on selected issues in this topic. The main development needs were seen in the handling of CCF and the reference levels for result presentation. CCF events can be difficult to assess due to possibilities to interpret the event differently. Therefore a sensitivity study with varying assumptions is recommended as a general approach. Reference levels for indicators are proposed based on the survey of criteria used internationally. The paper summarizes the results.
Original languageEnglish
Title of host publicationProceedings of PSAM 10
Subtitle of host publicationInternational Probabilistic Safety Assessment & Management Conference, 7–11 June 2010, Seattle, Washington, USA
PublisherInternational Association of Probabilistic Safety Assessment and Management IAPSAM
Pages337-348
ISBN (Print)978-1-4507-1556-0
Publication statusPublished - 2010
MoE publication typeA4 Article in a conference publication
Event10th International Probabilistic Safety Assessment & Management Conference, PSAM 10 - Seattle, United States
Duration: 7 Jun 201011 Jun 2010

Conference

Conference10th International Probabilistic Safety Assessment & Management Conference, PSAM 10
Abbreviated titlePSAM 10
CountryUnited States
CitySeattle
Period7/06/1011/06/10

Keywords

  • PSA
  • risk follow-up
  • PSA application
  • CCF

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