公开(公告)号：US10726959B2

公开(公告)日：2020-07-28

申请号：US15099398

申请日：2016-04-14

申请人： Hitachi-GE Nuclear Energy, Ltd.

发明人： Kenichi Katono ,  Masao Chaki ,  Kazuaki Kito

IPC分类号： G21C15/18 ,  G21C9/012 ,  G21C13/02

摘要： When a power source is lost after an operation stop of a nuclear power plant, a first open/close valve is opened via a first battery at an early stage and steam in a reactor pressure vessel (RPV) is condensed in a suppression pool. The heat of the water in the suppression pool is transmitted to a cooling water pool located below inner space between first and second reactor containment vessels surrounding the RPV. A second open/close valve is opened via a second battery at the early stage and cooling water in a tank is injected into the RPV. After the early stage, a third open/close valve is opened via a third battery, and a cooling medium becomes steam by an evaporator in the RPV, the steam being condensed by a condenser disposed in the inner space to become a liquid of the cooling medium and is returned to the evaporator.