Nuclear power plant passive reactor cavity water injection system

Abstract

The invention discloses a nuclear power plant passive reactor cavity water injection system. The nuclear power plant passive reactor cavity water injection system comprises a water injection tank, a water injection pipeline, an electric isolation valve and a self-actuated flow control valve assembly, wherein the water injection tank is used for storing water, and injecting water into a reactor cavity; one end of the water injection pipeline is connected with the bottom of the water injection tank, and the other end is connected with the reactor cavity; the water injection pipeline is used forinjecting water in the water injection tank into the reactor cavity; the electric isolation valve is arranged on the water injection pipeline, and is used for controlling the communication or isolation between the water injection tank and the reactor cavity; the self-actuated flow control valve assembly is arranged on the water injection pipeline between the electric isolation valve and the reactor cavity, takes potential energy of the water in the water injection tank as a power source, and is used for keeping water injection flow of the water injection tank in an approximately-stable state.Compared with the prior art, the nuclear power plant passive reactor cavity water injection system has the advantages of simple structure, convenience in arrangement, stable flow control, low requirement on water injection tank distribution, saving in water resources, and capability of improving the running safety of nuclear power plants.

Description

technical field [0001] The invention belongs to the field of nuclear power, and more specifically, the invention relates to a passive reactor cavity water injection system of a nuclear power plant. Background technique [0002] At present, newly-built nuclear power plants and nuclear power plants in service at home and abroad are equipped with core melt retention systems after severe accidents to alleviate severe accidents and prevent the release of radioactive substances, mainly including two technical solutions: retention inside the pressure vessel and retention outside the pressure vessel . [0003] For stagnation outside the pressure vessel, it mainly provides a passive pressurized water reactor nuclear power plant core catcher with a molten material expansion chamber, which expands, retains and cools the molten material when the pressure vessel fails. After a serious accident, assuming that the pressure vessel is melted through, a core capture, cooling and stabilizatio...

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Problems solved by technology

[0007] 2) There is a certain deviation in the set pressure behind the pressure reducing valve, which causes the top pressure of the water injection tank to be in a pressure range, and the water injection flow rate of the system may exceed the design flow range of the system;

[0008] 3) The orifice plate is used to control the water injection flow, which requires high design pressure of pressure storage containers, water injection tanks, valves and other equipment and connected pipelines, which is poor in economy and increases the risks of equipment maintenance and operation maintenance;

[0009] 4) The orifice plate is used to control the water injection flow, and the flow range is too large, which causes a certain waste of water source and increases the capacity of the water injection tank

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