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Joint application of risk oriented accident analysis methodology and PSA level 2 to severe accident issues in Nordic BWR
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety. KTH, School of Engineering Sciences (SCI), Physics, Nuclear Engineering.ORCID iD: 0000-0001-8216-9376
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2018 (English)In: PSAM 2018 - Probabilistic Safety Assessment and Management, International Association for Probablistic Safety Assessment and Management (IAPSAM) , 2018Conference paper, Published paper (Refereed)
Abstract [en]

A comprehensive and robust assessment of severe accident management effectiveness in preventing unacceptable releases is a challenge for a today’s real life PSA. This is mainly due to the fact that major uncertainty is determined by the physical phenomena and timing of the events. The static PSA is built on choosing scenario parameters to describe the accident progression sequence and typically uses a limited number of simulations in the underlying deterministic analysis. Risk Oriented Accident Analysis Methodology framework (ROAAM+) is being developed in order to enable consistent and comprehensive treatment of both epistemic and aleatory uncertainties. The framework is based on a set of deterministic models that describe different stages of the accident progression. The results are presented in terms of distributions of conditional containment failure probabilities for given combinations of the scenario parameters. This information is used for enhanced modeling in the PSA-L2. Specifically, it includes improved definitions of the sequences determined by the physical phenomena rather than stochastic failures of the equipment, improved knowledge of timing in sequences and estimation of probabilities determined by the uncertainties in the phenomena. In this work we present an example of application of the dynamic approach in a large scale PSA model and show that the integration of the ROAAM+ results and the PSA model can potentially lead to a considerable change in PSA Level 2 analysis results. 

Place, publisher, year, edition, pages
International Association for Probablistic Safety Assessment and Management (IAPSAM) , 2018.
Keywords [en]
Nordic BWR, PSA L2, ROAAM, Severe accident, Accident prevention, Accidents, Probability distributions, Risk analysis, Risk assessment, Stochastic systems, Uncertainty analysis, Aleatory uncertainty, Deterministic analysis, Deterministic models, Severe accident management, Boiling water reactors
National Category
Probability Theory and Statistics
Identifiers
URN: urn:nbn:se:kth:diva-252277Scopus ID: 2-s2.0-85063145364OAI: oai:DiVA.org:kth-252277DiVA, id: diva2:1322050
Conference
14th Probabilistic Safety Assessment and Management, PSAM 2018, 16 September 2018 through 21 September 2018
Note

QC20190610

Available from: 2019-06-10 Created: 2019-06-10 Last updated: 2019-06-10Bibliographically approved

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Scopushttp://psam14.org/

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Galushin, SergeyGrishchenko, DmitryKudinov, Pavel

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