Abstract
The effects of external cooling of a pressurized water reactor vessel are investigated by means of model calculations. The buoyancy driven convection, the dynamics of the metallic layer, wall ablation, and the spatial and temporal heat flux distribution phenomena in the lower head of the vessel after relocation of the molten core are analysed. It is demonstrated that the dynamics of the formation of the metallic layer has a decisive influence upon the thermal attack on the vessel wall.
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