Patent ID: 8559583
Filing Date: 2013-10-15
Classification: G21C,Y02E

Abstract:
1. A passive cooling and depressurization system for a pressurized water nuclear plant having a reactor pressure vessel for containing a reactor core cooled by primary coolant, a steam generator connected to the reactor pressure vessel by a hot leg pipe and a cold leg pipe, and a containment vessel containing the reactor pressure vessel, the steam generator, the hot leg pipe and the cold leg pipe, the passive cooling and depressurization system comprising: a pressurizer connected to the hot leg pipe by a riser pipe for pressurizing an inside of a reactor pressure boundary where the primary coolant flows; a cooling water pool; a heat exchanger installed in the cooling water pool including an upper header, a lower header and a heat exchanger tube; a steam supply piping extending from a gas phase of the pressurizer to the upper header of the heat exchanger; a steam supply valve equipped on the steam supply piping; a coolant return pipe extending from the heat exchanger to a liquid phase of the reactor pressure boundary; and an outlet valve equipped on the coolant return pipe, wherein the heat exchanger exchanges heat between water stored in the cooling water pool and steam supplied through the steam supply piping.