Patent ID: 8817941

Claim:
A pressurized water reactor plant comprising: a single reactor vessel housing a reactor core cooled by a high-pressure primary coolant; a single steam generator that generates steam of a secondary coolant; the steam generator having: a plurality of tubes in which the primary coolant heated in the reactor core and discharged outside the reactor vessel is circulated, and one barrel portion housing the plurality of tubes and configured so as to guide the secondary coolant, which is lower in pressure than the primary coolant and higher in pressure than atmospheric pressure around the plurality of tubes; a hot leg pipe that guides the primary coolant heated in the reactor core from the reactor vessel to the plurality of tubes of the steam generator; at least two cold leg pipes configured to return the primary coolant that has been passed through the plurality of tubes of the steam generator to the reactor vessel; at least two reactor coolant pumps that feed the primary coolant in the at least two cold leg pipes to the reactor vessel; a pressurizer provided so as to communicate with a reactor pressure boundary in which the primary coolant flows, having a liquid surface therein, and pressurizing the reactor pressure boundary; a containment vessel containing the reactor vessel, the steam generator, the hot leg pipe, the at least two cold leg pipes, the at least two reactor coolant pumps, and the pressurizer; and a primary system depressurization device that equalizes a pressure of a primary system where the primary coolant flows to a pressure of a secondary system where the secondary coolant flows, when an accident has occurred in which a part of the plurality of tubes in the steam generator is ruptured.