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Simulation of core melt pool formation in a reactor pressure vessel lower head using an effective convectivity model
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.
2007 (English)In: Proceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12, 2007Conference paper, Published paper (Refereed)
Abstract [en]

The present study is concerned with the extension of the Effective Convectivity Model (ECM) to the phase-change problem to simulate the dynamics of the melt pool formation in a Boiling Water Reactor (BWR) Lower Plenum (LP) during a hypothetical severe accident scenario. The Phase-change ECM (PECM) was examined using a dual-tier approach, namely validations against existing experimental data and validation against results obtained from Computational Fluid Dynamics (CFD) simulations. Three models of the fluid velocity in a mushy zone were implemented in the PECM and their performance was compared. A linear dependency of the fluid velocity in a mushy zone on the fluid fraction applied in the PECM gives consistent results with the CFD simulations. The PECM was applied to simulation of heat transfer in a BWR lower plenum during a severe accident scenario. Results of the PECM core melt pool transient simulation are reported in the paper. We show that the PECM is an adequate and effective tool to compute the dynamics of core melt pool formation.

Place, publisher, year, edition, pages
2007.
Keywords [en]
Core melt pool, Effective convectivity model, Heat transfer, Mushy velocity, Phase change, Severe accident
National Category
Other Physics Topics
Identifiers
URN: urn:nbn:se:kth:diva-155301Scopus ID: 2-s2.0-44449162101ISBN: 0894480588 (print)ISBN: 978-089448058-4 OAI: oai:DiVA.org:kth-155301DiVA, id: diva2:762607
Conference
12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12, 30 September 2007 through 4 October 2007, Pittsburgh, PA, United States
Note

QC 20141112

Available from: 2014-11-12 Created: 2014-11-04 Last updated: 2014-11-12Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
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More styles
Language
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  • Other locale
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Output format
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