Large-scale passive pressurized water reactor nuclear power plant reactor core catcher with melt expansion room

Abstract

The invention provides a large-scale passive pressurized water reactor nuclear power plant reactor core catcher with a melt expansion room. The large-scale passive pressurized water reactor nuclear power plant reactor core catcher with the melt expansion room comprises a reactor cavity which coats the middle lower portion of a reactor pressure vessel, a reactor cavity concrete base plate is arranged on the lower portion of the reactor cavity, and a reactor cavity refractory layer is arranged on the lower portion of the reactor cavity concrete base plate. The upper end of a melt release passage is communicated with the reactor cavity refractory layer, and the lower end of the melt release passage is communicated with the melt expansion room. The inner wall of the melt release passage surrounds the refractory layer. An expansion room concrete base plate is arranged on the lower portion of the melt expansion room, an expansion room refractory layer is arranged on the lower portion of the expansion room concrete base plate, and an expansion room outside cooling passage is arranged on the lower portion of the expansion room refractory layer. Two ends of the expansion room outside cooling passage extend outwards and are respectively an outside cooling passage entrance and an outside cooling passage exit. The large-scale passive pressurized water reactor nuclear power plant reactor core catcher with the melt expansion room is used for successively implementing expansion, retention and cooling of the melt when the a pressure container loses efficacy and can strengthen capacity of relieving severe accidents of the large-scale passive pressurized water reactor nuclear power plant.

Description

technical field [0001] The invention relates to a core catcher of a large passive pressurized water reactor nuclear power plant, in particular to a passive cooling design adopting a melt expansion chamber to further improve the safety of the nuclear power plant. Background technique [0002] The use of the core trap technology can make the molten material from the pressure vessel effectively stay in a certain device, and the interaction between the core molten material and the concrete can be effectively prevented by adopting the corresponding external cooling technology of the molten material, thereby Reduce the risk of melting through the bottom of the containment vessel, significantly reduce the release of fission products to the environment, and greatly reduce the radioactive consequences of severe accidents. [0003] In the design of existing passive PWR nuclear power plants, many severe accident mitigation strategies have been adopted. For example, in the AP1000 nucle...

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Problems solved by technology

Therefore, the IVR also has the risk of failure. After the IVR fails, the core melt will be released from the pressure vessel to the reactor cavity. If there is a large amount of water in the reactor cavity, a steam explosion will occur, and the interaction between the c

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