Emergency Core Cooling System Consists of Reactor Safeguard Vessel and Accumulator

摘要

PURPOSE: A method and apparatus is provided to cool the emergency core by using an iron protection container, compression tank with a cooling water and a natural circulation phenomenon in the reactor container, while achieving improved safety of integrated type nuclear reactor and reducing the amount of cooling water. CONSTITUTION: A nuclear reactor protection container(2) is installed around a nuclear reactor vessel(1), and a vapor generator(3) disposed within the nuclear reactor vessel is arranged to be connected to an external passive residual heat removal system(4). A compression tank(5) is arranged at the top of the nuclear reactor vessel in such a manner that a cooling water is injected into the compression tank. A method is characterized in that a small protection container with a high pressure is installed outside the nuclear reactor vessel, the cooling member emitted from the nuclear reactor vessel is cut off by using the increase pressure caused due to the flashing of the cooling member emitted during the accident of cooling member loss, and the emergency core cooling water is supplied in a passive manner by using the compression tank. The decay heat generated from the core is removed by the passive residual heat removing system using a natural circulation and stream generator disposed in the nuclear reactor vessel.