Method and system for exporting waste heat of reactor core in containment

Abstract

The invention discloses a method and system for exporting waste heat of a reactor core in a containment. The method comprises the steps that a low-pressure safety injection subsystem of a safety injection system is communicated with a heat exchanger of a waste heat removal system under a design basis accident working condition, wherein the low-pressure safety injection subsystem exports a coolant absorbing the waste heat of the reactor core to the heat exchanger for heat exchange and cooling, the coolant subjected to heat exchange and cooling by the heat exchanger returns and is injected into the reactor core, the coolant circularly flows, and the waste heat of the reactor core is continuously exported until the reactor core is in a safe state; under the design basis accident working condition and the condition that the low-pressure safety injection subsystem is put into use, the volume of the containment does not exceed the design pressure of the containment within at least 24 hours, and the combined design can simplify specially-arranged safety facilities, ensure the independence of the second level and the third level of depth defense, improve the safety and reduce the construction, operation and maintenance cost.

Description

technical field [0001] The invention belongs to the technical field of the nuclear industry, and in particular relates to a method and system for deriving residual heat from a reactor core in a containment vessel. Background technique [0002] As one of the important facilities for nuclear power plant reactor core protection, the containment vessel needs to be equipped with a good heat export system to quickly and effectively export the residual heat of the core and the heat in the containment vessel under accident conditions. [0003] Refer to the patent application document with the patent publication number CN104217773A, a general nuclear power plant is equipped with a containment spray system, a safety injection system, and a waste heat removal system for deriving containment and core waste heat under design basis accident conditions: containment spray The system is used to export the heat of the containment under the design basis accident conditions, and transfer the he...

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Problems solved by technology

[0004] For this design, under the design basis accident conditions, two special safety systems, the safety injection system and the containment sprinkler system, and the waste heat removal system are required to cooperate with each other to take out the waste heat of the core, and the construction, operation and maintenance costs are high.

Moreover, the residual heat removal system is used both in normal operating conditions and in design basis accident conditions, which cannot meet the requirements of defense in depth on the independence of each level

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