Change search
ReferencesLink to record
Permanent link

Direct link
Effectiveness of the debris bed self-leveling under severe accident conditions
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.
2016 (English)In: Annals of Nuclear Energy, ISSN 0306-4549, E-ISSN 1873-2100, Vol. 95, 75-85 p.Article in journal (Refereed) PublishedText
Abstract [en]

Melt fragmentation, quenching and long term coolability in a deep pool of water under the reactor vessel are employed as a severe accident mitigation strategy in several designs of light water reactors. The success of such strategy is contingent upon the natural circulation effectiveness in removing the decay heat generated in the porous debris bed. The maximum height of the bed is one of the important factors which affect the debris coolability. The two-phase flow within the bed generates mechanical energy which can change the geometry of the debris bed by the "self-leveling" phenomenon. In this work.we developed an approach to modeling of the self-leveling phenomenon. Sensitivity analysis was carried out to rank the importance of the model uncertainties and uncertain input parameters i.e. the conditions of the accident scenario and the debris bed properties. The results provided some useful insights for further improvement of the model and reduction of the output uncertainties through separate-effect experimental studies. Finally, we assessed the self-leveling effectiveness, quantified its uncertainties in prototypic severe accident conditions and demonstrated that the effect of self-leveling phenomenon is robust with respect to the considered input uncertainties.

Place, publisher, year, edition, pages
2016. Vol. 95, 75-85 p.
Keyword [en]
Severe accident, Debris bed, Self-leveling, Spreading, Sensitivity analysis, Granular flow
National Category
Atom and Molecular Physics and Optics
URN: urn:nbn:se:kth:diva-190636DOI: 10.1016/j.anucene.2016.04.048ISI: 000379369100009ScopusID: 2-s2.0-84969567863OAI: diva2:953702

QC 20160818

Available from: 2016-08-18 Created: 2016-08-12 Last updated: 2016-08-18Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Basso, SimoneKonovalenko, AlexanderKudinov, Pavel
By organisation
Nuclear Power Safety
In the same journal
Annals of Nuclear Energy
Atom and Molecular Physics and Optics

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 17 hits
ReferencesLink to record
Permanent link

Direct link