Kabushiki Kaisha Toshiba

Hiromasa Yanagisawa

Hirohide Oikawa

Makoto Akinaga

Ryoichi Hamazaki

A drain sump of a reactor containment vessel having a containment vessel floor down below a reactor pressure vessel, and includes a heat-proof sump cover and two or more drain flow paths. The drain sump is arranged inside the containment vessel floor. The heat-proof sump cover has a thickness, and covers an upper part of the drain sump. The thickness allows a top surface of the sump cover to lie in the same surface as a top surface of the containment vessel floor. The drain flow paths pass through the sump cover in a thickness direction to flow water therethrough and solidify a molten corium therein. The molten corium is produced in the unlikely event of a severe accident.

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Kanagawa-ken, Japan

Hiromasa Yanagisawa