Passive waste heat discharging system on secondary side of steam generator

Abstract

The invention belongs to a special safety system for a nuclear power plant, specifically relates to a passive waste heat discharging system on a secondary side of a steam generator. The passive waste heat discharging system comprises a direct current steam generator, wherein a passive discharged waste heat exchanger is arranged between a main steam pipeline and a main water feeding pipe of the direct current steam generator, and inlet and outlet pipelines of the passive discharged waste heat exchanger are respectively provided with an inlet isolating valve and an outlet isolating valve, and the outlet isolating valve is frequently closed. The passive waste heat discharging system provided by the invention is arranged on the main steam pipeline and the main water feeding pipeline at the side of the steam generator and fully utilizes the characteristic of high heat exchange efficiency between steam and water phases, and the decay heat of a reactor core is derived under a working condition of power cut of the whole plant; thus, the safety of a reactor is guaranteed, requirements on arrangement space are lowered, pipelines directly connected with a reactor coolant system are reduced, the cracking probability of the pipelines is reduced, and security is improved.

Description

technical field [0001] The invention belongs to a special safety system for a nuclear power plant, and in particular relates to a passive waste heat discharge system arranged on the secondary side of a steam generator. Background technique [0002] The issue of decay heat export after reactor shutdown is a key technology related to the safety of nuclear power plants, especially in the case of power loss, if the core decay heat cannot be exported, the reactor temperature and pressure will rise sharply, resulting in reactor pressure Overpressure in the container may even cause the core to melt, causing the radioactive material to lose the second barrier, resulting in an accident beyond the design basis. Although the probability of its occurrence is very low, it will have a great impact on the safety of the nuclear power plant and even the surrounding residents. Therefore, it is necessary to Set up relevant systems to solve the problem of derivation of core decay heat under the...

AI Technical Summary

Problems solved by technology

[0002] The issue of decay heat export after reactor shutdown is a key technology related to the safety of nuclear power plants, especially in the case of power loss, if the core decay heat cannot be exported, the reactor temperature and pressure will rise sharply, resulting in reactor pressure Overpressure in the container may even cause the core to melt, causing the radioactive material to lose the second barrier, resulting in an accident beyond the design basis. Although the probability of its occurrence is very low, it will have a great impact on the safety of the nuclear power plant and even the surrounding residents. Therefore, it is necessary to Set up related systems to solve the problem of derivation of core decay heat under the condition of power failure or other heat conduction path loss in the whole plant

[0003] At present, the core decay heat export system used in existing nuclear power plants is a dynamic device that needs to be driven by electricity.

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