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In-vessel corium retention via external reactor pressure vessel cooling is considered to be an effective severe accident management strategy for corium localisation and stabilisation. The main idea consists in flooding the reactor cavity and transferring the decay heat through the reactor wall to the encirclement water and than to the atmosphere of the containment of nuclear power plant. The aim of this strategy is to localise and to stabilise the corium inside reactor pressure vessel. Not using this procedure could destroy the integrity of vessel and might cause the interaction of the...