Active and passive combined containment sump water cooling system

Abstract

The invention belongs to a secure system of a nuclear power plant, and in particular relates to an active and passive combined containment sump water cooling system. The system comprises a cooling water tank, a sump hydrothermal exchanger, a cold water pipeline, a hot water pipeline, an inlet isolation valve, an outlet isolation valve, an injection pump and a water taking pipeline. After the nuclear power plant meets an accident, the active and passive combined containment sump water cooling system is used for cooling containment sump water so as to finally guide heat in a containment out to the environment; therefore, temperature rise and pressure rise, which are caused by boiling of sump water, of the containment are prevented, and the completeness of the containment is finally kept.

Description

technical field [0001] The invention belongs to the safety system of nuclear power plants, and in particular relates to a containment pit water cooling system combining active and passive functions. Background technique [0002] The containment shell of a nuclear power plant is the fourth barrier to prevent the release of radioactivity to the environment. After an accident in a nuclear power plant, the heat in the containment shell of the nuclear power plant must be exported to the outside of the containment shell to ensure the integrity of the containment shell. [0003] After an accident in a nuclear power plant, the core still releases a large amount of decay heat continuously. In order to keep the core cool and maintain the integrity of the containment, the decay heat generated by the core must be exported outside the containment. Normally, the decay heat generated by the core is exported outside the containment through the waste heat removal system. In the event of a ...

AI Technical Summary

Problems solved by technology

As the core continues to release decay heat, if the heat in the pit cannot be exported to the outside of the containment, the water temperature in the containment pit will rise until it reaches saturation, causing the temperature and pressure of the containment to rise, thereby threatening safety. shell integrity

[0004] At present, domestic second-generation plus nuclear power plants discharge the heat in the containment by spraying heat exchangers. After the containment spray fails, the heat in the containment cannot be exported to the outside of the containment.

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