Patent ID: 8537959
Filing Date: 2013-09-17
Classification: G21C,Y02E

Abstract:
1. A drain sump of a nuclear reactor containment vessel having a containment vessel floor down below a reactor pressure vessel in the containment vessel, comprising: a heat-proof sump cover having a thickness to cover an upper part of the drain sump, the thickness allowing a top surface of the sump cover to be in a same surface as a top surface of the containment vessel floor; and a plurality of drain flow paths passing through the sump cover in a thickness direction to flow water therethrough and solidify a molten corium therein, the molten corium being produced in an unlikely event of a severe accident, wherein the drain sump is arranged inside the containment vessel floor, and wherein the top surface of the containment vessel floor comprises portions that are not part of the sump cover.