Long-term cooling system for loss-of-coolant accident during isolation failure of modular small reactor containment

Abstract

The invention discloses a long-term cooling system for a loss-of-coolant accident during the isolation failure of a modular small reactor containment. The cooling system comprises a primary cooling loop, a secondary cooling loop and a tertiary cooling loop, the primary cooling loop is a loop formed between a reactor core water supply tank and a pressure container, boron-containing water in the reactor core water supply tank enters the pressure container through a pressure container direct-injection pipeline and is supplied to the reactor core, the boron-containing water in the pressure container returns into the reactor core water supply tank through a pipeline, the secondary cooling loop is a loop formed between a built-in refueling water storage tank and the pressure container, the boron-containing water in the built-in refueling water storage tank enters the pressure container through the pressure container direct-injection pipeline, and is supplied to the reactor core, steam generated by the reactor core returns into the built-in refueling water storage tank through an automatic pressure relief system, and the tertiary cooling loop is a natural circulation loop formed between aground pit and the reactor core. The problem that existing cooling systems cannot achieve long-term cooling of the reactor core after the loss-of-coolant accident during isolation failure of the containment is solved in the invention.

Description

technical field [0001] The invention relates to the technical field of accident response in a pressurized water reactor nuclear power plant, in particular to a long-term cooling system for a loss of water accident when the isolation of the containment vessel of a modular small reactor fails. Background technique [0002] For the pressurized water reactor nuclear power plant (such as AP1000) that adopts passive safety injection system, the long-term cooling after the loss of water accident uses the containment passive cooling system as the final heat sink. realized by the natural circulation process. The condensed water collected in the pit is injected into the core through the cold water injection pipeline (pit recirculation pipeline-pressure vessel direct injection pipeline), and the steam generated in the core is discharged into the containment through the discharge pipeline (automatic pressure relief system pipeline and breach) , and is condensed back to the pit, re-inje...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a long-term cooling system for the loss of water accident when the isolation of the containment of the modular small reactor fails, and solve the problem of long-term cooling of the core after the loss of water accident when the existing cooling system cannot realize the isolation failure

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