During a severe nuclear accident, a part of the molten corium resulting from the core degradation may relocate down to the lower plenum of the reactor vessel. The interaction with residual water in the lower plenum leads to a fragmentation of the corium and formation of particles (characteristic length-scale: 1-5 mm). In order to predict the safety margin of the reactor under such conditions, the coolability of this porous heat-generating medium and the possibility to reflood the particle bed are studied in t…
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