Emergency Core Cooling System and Emergency Core Cooling Method for Fail-Safe Water-Cooled Reactor System

摘要

An emergency core cooling system and method for a fail-safe water-cooled reactor is disclosed, which completely remove decay heat generated from a core in safety without the use of an active component (i.e., pump). The exemplary embodiments include a reactor vessel using water as a coolant and a moderator, and receiving therein a reactor core on which nuclear fission occurs; a containment surrounding the entire reactor system including the reactor vessel and condensing a vapor discharged from the reactor vessel when emergency core cooling is performed; a reactor cavity which surrounds the reactor vessel and in which water condensed in the containment is collected due to gravity; a first cavity pipe provided to pass through the reactor vessel; and a cavity valve provided on the cavity pipe to open the first cavity pipe when emergency core cooling is performed and discharge the vapor generated from the reactor vessel.