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Risk And Uncertainty Quantification In Debris Bed Coolability
A. Yu. Ishlinskii Institute for Problems in Mechanics of the Russian Academy of Sciences.
Department of Nuclear Science and Engineering, Massachusetts Institute of Technology.
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.ORCID iD: 0000-0002-0683-9136
2013 (English)In: 15th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, Pisa, Italy, 2013Conference paper (Refereed)
Abstract [en]

An approach to the quantification of uncertainties inherent in the debris bed coolability problem and associated risks analysis is presented. The approach relies on the “Load vs Capacity” concept which compares the thermal loads due to decay heat release and the maximum heat which can be safely removed by water evaporation, both quantities considered as uncertain values due to the uncertainties in the porous material properties, accident scenarios, debris bed shape etc. At the current level of knowledge, not only the distribution functions, but also the ranges of the input parameters cannot be fully quantified. To study the influence of these factors, distribution functions for the Load (decay heat power) and Capacity (maximum power which can be safety removed) are obtained using different ranges and distribution functions for the input parameters. In each case, the probabilities of dryout are evaluated for flat and cone-shaped debris beds. The results obtained demonstrate the advantages of risk-oriented approach and importance of its embedding into the technical decision-making process.

Place, publisher, year, edition, pages
Pisa, Italy, 2013.
National Category
Energy Engineering
URN: urn:nbn:se:kth:diva-139102OAI: diva2:683812
The 15th International Topical Meeting on Nuclear Reactor Thermal - Hydraulics, NURETH-15, Pisa, Italy, May 12-17, 2013

NV 20140219

Available from: 2014-01-07 Created: 2014-01-07 Last updated: 2014-02-19Bibliographically approved

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