NUCLEAR POWER PLANT REACTOR PRESSURE VESSEL AND SHIELDING WALL COMBINATION STRUCTURE

摘要

A nuclear power plant reactor pressure vessel and shielding wall combination structure. The combination structure comprises a reactor pit shielding wall (10), a reactor pit (20) formed by the reactor pit shielding wall (10) in an enclosed manner, a reactor pressure vessel (30) disposed in the reactor pit (20), and a thermal insulation layer (34) disposed outside the reactor pressure vessel (30). Up-and-down-through flow channels are respectively disposed between the thermal insulation layer (34) and the reactor pressure vessel (30) and between the thermal insulation layer (34) and the reactor pit shielding wall (10). A reactor pit water injection pipeline (18) is disposed at the lower part of the reactor pit shielding wall (10) in a penetration manner. An accommodation space (120) is disposed on the inner wall of the upper part of the reactor pit shielding wall (10). A flow return path (124) for communicating the accommodation space (120) with a bottom space of the reactor pit is disposed in the reactor pit shielding wall (10). In the combination structure, the flow return path is disposed in the reactor pit shielding wall to ensure saturated water entrained by steam can smoothly flow back into the reactor pit, so that a stable natural circulation can be formed between a rising flow path and the flow return path in the reactor pit to ensure that the reactor pressure vessel can be continuously and rapidly cooled under severe accident working conditions.