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Risk Analysis Framework for Decision Support for Severe Accident Mitigation Strategy in Nordic BWR
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Engineering. employer.ORCID iD: 0000-0001-8216-9376
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Engineering.
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Engineering.
2018 (English)In: PSAM 2018 - Probabilistic Safety Assessment and Management, 2018Conference paper, Published paper (Refereed)
Abstract [en]

Severe accident management (SAM) in Nordic boiling water reactors (BWRs) employ ex-vessel debris cooling in a deep water pool. The success of the strategy requires formation of a coolable porous debris bed; no energetic steam explosion that can threaten containment integrity. Both scenario (aleatory) and modeling (epistemic) uncertainties are important in the assessment of the failure risks. A consistent approach is necessary for the decision making on whether the strategy is sufficiently effective, or modification of the SAM is necessary. Risk Oriented Accident Analysis Methodology (ROAAM+) is a tool for assessment of failure probability to enable robust decision making, insensitive to remaining uncertainty. The challenge for a decision maker is to distinguish the cases when collecting more knowledge and reduction of uncertainty in risk assessment, or modification of risk management strategy would be the most adequate approach given the safety goals and criteria. When either decision is made, ROAAM+ can provide data for selection of the most efficient implementation of the decision by selecting research priorities or modifying design elements that contribute most to the risk. In this work we discuss different approaches for communication of ROAAM+ framework analysis results and decision support. We focus on connection and integration of ROAAM+ results into risk-informed decision making models used in nuclear industry. The results of risk analysis are used in order to provide necessary insights on conditions when suggested changes in the safety design can be justified, taking into account different aspects of risk.

Place, publisher, year, edition, pages
2018.
Keywords [en]
Decision support; ROAAM; Uncertainty quantification
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-238825Scopus ID: 2-s2.0-85063162261OAI: oai:DiVA.org:kth-238825DiVA, id: diva2:1262582
Conference
Probabilistic Safety Assessment and Management PSAM 14, September 2018, Los Angeles, CA.
Note

QC 20181217

Available from: 2018-11-12 Created: 2018-11-12 Last updated: 2019-05-27Bibliographically approved

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Galushin, SergeyKudinov, PavelGrishchenko, Dmitry
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CiteExportLink to record
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Citation style
  • apa
  • ieee
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  • vancouver
  • Other style
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Language
  • de-DE
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  • fi-FI
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  • nn-NB
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More languages
Output format
  • html
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  • asciidoc
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