Development and validation of conservative-mechanistic and best estimate approaches to quantifying mass fractions of agglomerated debris
2013 (English)In: Nuclear Engineering and Design, ISSN 0029-5493, E-ISSN 1872-759X, Vol. 262, 452-461 p.Article in journal (Refereed) Published
Ex-vessel termination of accident progression in Swedish type Boiling Water Reactors (BWRs) is contingent upon efficacy of melt fragmentation, quenching, solidification and formation of a coolable by natural circulation porous debris bed in a deep pool of water below reactor vessel. When liquid melt reaches the bottom of the pool it can cause formation of agglomerated debris and "cake" regions, which affect hydraulic resistance and thus coolability of the bed. This paper discusses development and validation of conservative-mechanistic and best estimate approaches to quantifying mass fractions of agglomerated debris at given conditions of melt release from the vessel. Fuel coolant interaction (FCI) code VAPEX-P is used as a computational vehicle for modeling. Experimental data from the DEFOR-A (Debris Bed Formation and Agglomeration) tests with binary oxidic simulant material melt is used for validation of developed methods. The paper discusses the influence of different inherent uncertainties in the prediction of the fraction of agglomerated debris.
Place, publisher, year, edition, pages
2013. Vol. 262, 452-461 p.
Experimental datum, Fuel-coolant interaction, Hydraulic resistances, Melt fragmentation, Natural circulation, Reactor vessel, Simulant materials
IdentifiersURN: urn:nbn:se:kth:diva-129110DOI: 10.1016/j.nucengdes.2013.05.020ISI: 000323588700042ScopusID: 2-s2.0-84879593917OAI: oai:DiVA.org:kth-129110DiVA: diva2:652164
FunderEU, European Research Council
QC 201309302013-09-302013-09-192013-09-30Bibliographically approved