Rapid mutual-backup system of nuclear power station and mutual-backup method thereof

Abstract

The invention relates to a rapid mutual-backup system of a nuclear power station and a mutual-backup method thereof, and is used for realizing rapid mutual-backup between a safety injection system and a containment spray system of the nuclear power station. The rapid mutual-backup system comprises a first pipeline connected with an outlet pipeline of a low pressure safety injection pump, a first isolating valve set and a second isolating valve set which are arranged on the first pipeline, a second pipeline connected with the downstream of the spray pump and the outlet pipeline of the low pressure safety injection pump, and a second isolating valve set arranged on the second pipeline. The rapid mutual-backup system can realize emergency rapid mutual-backup of the safety injection system and the containment spray system, reduces loss caused by accidents and facilitates guaranteeing the safety of a nuclear power plant simultaneously.

Description

Technical field [0001] The present invention relates to the field of nuclear power technology, and more specifically to a rapid mutual backup system and mutual backup method of nuclear power plants. Background technique [0002] China's million-kilowatt-class improved pressurized water reactor nuclear power plant is mainly composed of three main parts: pressurized water reactor, primary circuit system and secondary circuit system. The heat released by nuclear fission is carried out of the reactor by the high-pressure water flowing through the primary circuit system in the reactor, and the heat is transferred to the water in the secondary circuit. The steam generated after the water is heated drives the steam turbine, and the steam turbine drives the generator to generate electricity. Once a water loss accident occurs in a pressurized water reactor nuclear power plant, the core loses cooling and easily melts, which may cause major safety accidents. For this reason, in the design ...

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Problems solved by technology

[0005] 1) Due to problems in process design and other aspects, the existing H4 pipeline is generally allowed to be put into use two weeks after the accident, so it can only be used for long-term mutual backup, basically does not have the function of emergency mutual backup, and cannot intervene in the early stage of the accident. Little contribution to reducing the probability of core damage;

[0006] 2) Due to the process and layout design, before the H4 pipeline is used, the operator needs to fill and exhaust the high-radiation pipeline on site, and the risk of personnel exposure to radiation is relatively high;

[0007] 3) When the containment spray system fails completely, the safety injection system has no way to back up the function of the containment spray system, so it is very unfavorable to the integrity of the containment

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