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An approach to joint application of integrated deterministic-probabilistic safety analysis and PSA Level 2 to severe accident issues in Nordic BWRs
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.ORCID iD: 0000-0001-8216-9376
Lloyd’s Register Consulting, Stockholm, Sweden.
Lloyd’s Register Consulting, Stockholm, Sweden.
Lloyd’s Register Consulting, Stockholm, Sweden.
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2016 (English)Conference paper (Refereed)
Abstract [en]

In this paper we outline a conceptual approach for combined use of Probabilistic Safety Assessment (PSA) and Integrated Deterministic-Probabilistic Safety Assessment (IDPSA), considering Nordic Boiling Water Reactor (BWR) severe accident issues (specifically ex-vessel steam explosion and debris bed coolability) for illustration.

We describe a conceptual approach based on post processing of the results generated by IDPSA to update the “static” Boolean structures in the standard PSA representation. The challenge in the evaluation is to retain the failure combinations from the PSA to allow for component importance evaluation, to be able to perform the calculations in a reasonable time frame and to use all relevant information from the IDPSA results.

We discuss the approaches for determination of the event space (for IDPSA analysis) which is consistent with PSA damage states from PSA-L1 and L2. We also discuss application of post processing approach for analysis of huge amount of data generated in the process of uncertainty space exploration, which is difficult to use directly in decision making process including incorporation of such data into PSA framework, to update structures of “static” Boolean structures in standard PSA. Using data post processing approach we can significantly reduce amount of information which represents results from IDPSA analysis.

Place, publisher, year, edition, pages
IAPSAM , 2016.
Keyword [en]
Risk assessment, dynamic reliability, PSA, severe accident
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-194492OAI: oai:DiVA.org:kth-194492DiVA: diva2:1040694
Conference
13th International Conference on Probabilistic Safety Assessment and Management (PSAM 13) 2~7 October, 2016, Sheraton Grande Walkerhill, Seoul, Korea.
Note

QC 20161031

Available from: 2016-10-28 Created: 2016-10-28 Last updated: 2016-10-31Bibliographically approved

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