Nordic experience and experiments of modelling digital I&C systems in PSA

Stefan Authén, Jan-Erik Holmberg

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

Abstract

The OECD/NEA CSNI Working Group on Risk Assessment has set up a task group called DIGREL to develop a taxonomy of failure modes of digital components for the purposes of probabilistic safety assessment (PSA). A parallel Nordic activity carried out a pre-study where a comparison of Nordic experiences and a literature review was performed. The study showed a wide range of approaches and solutions to the challenges given by digital I&C, and also indicated that no state-of-the-art currently exists. An existing simplified PSA model has been complemented with fault tree models for a four-redundant distributed and diversified protection system in order to study and demonstrate the effect of design features and modelling approaches. The model has been used to test the effect of different levels of modelling detail, CCF modelling fail-safe principle and voting logic. The paper will present results of the experiments with the model
Original languageEnglish
Title of host publicationProceedings of the International Topical Meeting on Probabilistic Safety Assessment and Analysis, PSA 2013
Place of PublicationLa Grange Park, Illinois
PublisherAmerican Nuclear Society ANS
ISBN (Print)978-0-89448-702-6
Publication statusPublished - 2013
MoE publication typeA4 Article in a conference publication
EventInternational Topical Meeting on Probabilistic Safety Assessment and Analysis, PSA 2013 - Columbia, United States
Duration: 22 Sep 201326 Sep 2013

Conference

ConferenceInternational Topical Meeting on Probabilistic Safety Assessment and Analysis, PSA 2013
Abbreviated titlePSA 2013
CountryUnited States
CityColumbia
Period22/09/1326/09/13

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Keywords

  • probabilistic safety assessment
  • digital I&C
  • reliability analysis
  • failure mode
  • taxonomy

Cite this

Authén, S., & Holmberg, J-E. (2013). Nordic experience and experiments of modelling digital I&C systems in PSA. In Proceedings of the International Topical Meeting on Probabilistic Safety Assessment and Analysis, PSA 2013 [90] American Nuclear Society ANS.