Active-passive combined reactor core residual heat removal system for nuclear power station

Abstract

The invention relates to an active-passive combined reactor core residual heat removal system for a nuclear power station. The active-passive combined reactor core residual heat removal system comprises a safety injection system, a containment spraying system, an auxiliary water supply system, a reactor cavity water injection system, a secondary side passive residual heat removal system, a passive containment heat leading-out system and related valves and pipelines. The active-passive combined reactor core residual heat removal system provided by the invention realizes three safety functions of controlling reactivity, discharging reactor core heat and containing radioactive substance when an accident occurs in an active-passive combined multi-redundancy diversity manner. The active-passive combined reactor core residual heat removal system provided by the invention can completely realize the safety functions of safety injection and safety spraying under the condition that the accident occurs in a nuclear power plant, reactor cavity water injection under the serious accident working condition and the like, effectively improve reliability of a safety system, enhance coping capability of the safety system under the working condition that the accident occurs in the nuclear power station, can effectively prevent and relieve the serious accident, reduce the reactor core melting probability and risk probability of large-scale radioactivity release and greatly improve safety performance of the nuclear power station.

Description

technical field [0001] The invention belongs to nuclear power plant safety equipment, in particular to a nuclear power plant active and passive reactor core residual heat discharge system. Background technique [0002] During the operation of the reactor of a nuclear power plant, if the nuclear reaction is stopped, the nuclear fuel will continue to generate waste heat, and power or other power is still needed to maintain the water circulation of the primary and secondary circuits, so as to export the waste heat of the core and prevent the core from overheating and melting. This is an important goal to achieve in ensuring nuclear safety. Another important goal of nuclear safety is to contain radioactive material, for which three barriers are set up in nuclear power plants: fuel element cladding, pressure vessel and containment vessel. It is only necessary to keep any barrier intact to prevent radioactive material from leaking into the environment. The environment and the sa...

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Problems solved by technology

Due to the location of the steam condensate tank, its heat still has not been discharged from the containment vessel. Due to the high temperature and pressure in the containment vessel after the accident (145°C, 0.52MPa), this method of setting the steam condensate water tank inside the containment vessel The scheme is not conducive to the formation of natural circulation heat exchange loop

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