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Insight into steam explosion in stratified melt-coolant configuration
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.ORCID iD: 0000-0002-2725-0558
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.
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2013 (English)In: 15th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, 2013Conference paper, Published paper (Refereed)
Abstract [en]

Release of core melt from failed reactor vessel into a pool of water is adopted in several existing designs of light water reactors (LWRs) as an element of severe accident  mitigation  strategy.  When  vessel  breach  is  large  and  water  pool  is shallow,  released  corium  melt  can  reach  containment  floor  in  liquid  form  and spread under water creating a stratified configuration of melt covered by coolant. Steam  explosion  in  such  stratified  configuration  was  long  believed  as  of secondary importance for reactor safety because it was assumed that considerable mass of melt cannot be premixed with the coolant. In this work we revisit these assumptions  using  recent  experimental  observations  from  the  stratified  steam explosion tests  in  PULiMS  facility.  We  demonstrate  that  (i)  considerable  melt-coolant premixing layer can be formed in the stratified configuration with high temperature  melts,  (ii)  mechanism  responsible  for  the  premixing  is  apparently more  efficient  than  previously  assumed  Rayleigh-Taylor  or  Kelvin-Helmholtz instabilities.  We  also  provide  data  on  measured  and  estimated  impulses, energetics  of  steam  explosion,  and  resulting  thermal  to  mechanical  energy conversion ratios. 

Place, publisher, year, edition, pages
2013.
Series
NURETH, 15
Keyword [en]
steam explosion, melt-coolant interaction, PULiMS, light water reactor, stratification, melt
National Category
Other Physics Topics Other Engineering and Technologies not elsewhere specified
Research subject
SRA - Energy
Identifiers
URN: urn:nbn:se:kth:diva-137207OAI: oai:DiVA.org:kth-137207DiVA: diva2:678315
Conference
15th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-15,12 to 17 May, 2013, Pisa, Italy
Note

QC 20131212

Available from: 2013-12-11 Created: 2013-12-11 Last updated: 2013-12-12Bibliographically approved

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NURETH15-599.pdf(2172 kB)118 downloads
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Insight into steam explosion in stratified melt-coolant configuration

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Grishchenko, DmitryKonovalenko, AlexanderKarbojian, AramKudinova, ValtynaBechta, SevostianKudinov, Pavel
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