Assessment with Coupled Thermo-Mechanical Creep Analysis of Combined CRGT and External Vessel Cooling Efficiency for a BWR
NURETH-14 - 2011 September 25-30

Presented at:
2011 September 25-30
Toronto, Canada
Session Title:
E4-2 NPP Transients and Accidents Analysis

Walter Villanueva (Royal Institute of Technology)
Chi-Thanh Tran (Royal Institute of Technology)
Pavel Kudinov (Royal Institute of Technology)


In this paper we consider in-vessel stage of a severe core melt accident in a Nordic design Boiling Water Reactor (BWR). Decay-heated pool of corium melt inflicts thermal and mechanical loads on the lower-head vessel wall. Performed thermo-mechanical creep analysis identified two different modes of vessel wall failure: (i) a ‘ballooning’ of the vessel bottom and (ii) a ‘localized creep’ concentrated within the vicinity of the top surface of the melt pool. Next, given the mechanical and thermal loads from the decay-heated melt, external vessel cooling is applied at a specified time. It is found that combined CRGT and external vessel cooling was able to suppress the creep and subsequently prevent vessel wall failure.

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