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Risk-informed approach to debris bed coolability issue
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.ORCID iD: 0000-0002-0683-9136
2012 (English)In: Proceedings Of The 20th International Conference On Nuclear Engineering And The ASME 2012 Power Conference - 2012, Vol 2, ASME Press, 2012, no 1, 531-543 p.Conference paper (Refereed)
Abstract [en]

Coolability of an ex-vessel debris bed in severe accident conditions is considered from the risk perspective. The concept of "load versus capacity" is employed to quantify the probability of failure (local dryout). Possible choices of "load" and "capacity" in terms of heat fluxes, thermal power or melt mass are discussed. Results of Monte Carlo simulations of distribution functions for the local heat flux and the dryout heat flux at the debris bed top point (defined as the extensions of one-dimensional counterparts) are presented. A surrogate model for the dryout heat flux is developed by the generalization of two-dimensional simulation results. Dryout probabilities are obtained under the conservative assumptions (neglecting the coolability improvement due to side ingress of water into a non-flat debris bed), and from the surrogate model. Outlook is given for the prospective development of the risk-informed approach to debris bed coolability in the context of comprehensive severe accident risk analysis.

Place, publisher, year, edition, pages
ASME Press, 2012. no 1, 531-543 p.
Keyword [en]
Dryout heat flux, Local heat flux, Probability of failure, Risk perspective, Severe accident, Surrogate model, Thermal power, Two-dimensional simulations
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-144796DOI: 10.1115/ICONE20-POWER2012-55257ISI: 000324150800064ScopusID: 2-s2.0-84890077197ISBN: 978-0-7918-4496-0OAI: diva2:717688
2012 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference, ICONE 2012-POWER 2012; Anaheim, CA; United States; 30 July 2012 through 3 August 2012

QC 20140516

Available from: 2014-05-16 Created: 2014-04-29 Last updated: 2014-05-16Bibliographically approved

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Kudinov, Pavel
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ReferencesLink to record
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