A passive waste heat removal system for nuclear power plants

Abstract

The invention relates to a passive residual heat removal system for a nuclear power plant. The passive residual heat removal system for the nuclear power plant comprises a steam generator shell heat exchanger, a heat exchange loop pipeline, a shell exterior heat exchanger, a pressure maintaining valve, an isolating valve and a heat transferring medium, wherein the heat exchange loop pipeline penetrates through a containment; the steam generator shell heat exchanger is distributed on a steam generator and is communicated with the heat exchange loop pipeline; the shell exterior heat exchanger is arranged outside the containment and is communicated with the heat exchange loop pipeline; the shell exterior heat exchanger is arranged at a high position relative to the position of the steam generator shell heat exchanger; the pressure maintaining valve and the isolating valve are arranged in the containment and are sequentially arranged between the steam generator shell heat exchanger and the shell exterior heat exchanger along a first flow direction of the heat transferring medium in the heat exchange loop pipeline; the passive residual heat removal system for the nuclear power plant is maintained in a relatively low pressure level by virtue of the pressure maintaining valve; and the isolating valve and a shutdown safety signal of a reactor are subjected to interlock opening to be used for continuously taking away heat in the steam generator during an accident.

Description

technical field [0001] The invention relates to a passive waste heat discharge system, in particular to a passive waste heat discharge system of a nuclear power plant. Background technique [0002] Safe nuclear power is a clean energy with high energy density, which plays an important role in protecting the ecological environment, adjusting the energy structure and ensuring energy security. However, once a safety problem occurs in a nuclear power plant, it will pose a huge threat to the staff, surrounding residents, and the ecological environment. Therefore, the safety of nuclear power plants is an important issue that people must consider when using nuclear power. At present, nuclear power plants tend to adopt passive safety technology to deal with accidents. The so-called passive safety technology refers to the use of natural forces to complete various cooling functions in the event of an accident. Natural forces can be generated by gravity, pressure of accumulator gas, ...

AI Technical Summary

Problems solved by technology

At the same time, due to the limitation of natural circulation heat transfer capacity, the waste heat of the main circuit system cannot be completely carried by the secondary side of the steam generator. Therefore, the temperature and pressure in the main circuit system will also increase, causing the voltage stabilizer to take off

[0007] Whether it is the discharge of the main circuit system in a small breach accident or the steam discharge of the secondary side of the steam generator, it is directly in the containment, which will cause the containment to increase the pressure

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