A passive waste heat removal system based on water cooler

Abstract

The invention discloses a passive waste heat discharge system based on a water cooler. By adopting an annular water cooler compactly arranged around the reactor pressure vessel, the waste heat of the reactor core is brought out, and the circulating hot water tank is divided into a hot area and a cold area. The top of the hot zone and the cold zone are in two-way communication, and the bottom is equipped with a one-way flow device to limit the flow of cold fluid from the hot zone to the cold zone, which is conducive to the discharge of water vapor through the exhaust pipe on the top and enhances the circulation of the hot water tank The natural circulation ability between the annular water cooler; the hot fluid in the water-cooled tube is used as the ascending section, and the cold fluid in the annular descending chamber is used as the descending section, relying on the potential difference and density difference of the hot and cold fluid to form a natural circulation flow, circulation The water vapor formed in the hot zone of the hot water discharge tank is discharged through the exhaust pipe on the top, realizing the safe and reliable discharge of the residual heat in the core after the normal shutdown or accidental shutdown of the reactor core, and ensuring the fuel package The temperature of the shell, pressure vessel and wall of the reactor chamber shall not exceed the allowable temperature.

Description

technical field [0001] The invention relates to the technical field of nuclear industry cooling systems, in particular to a passive waste heat discharge system based on a water cooler. Background technique [0002] After the nuclear reactor shuts down, due to the remaining fission in the core and the decay of fission products, there will be residual heat in the core and last for a long time. The heat of the core will lead to an increase in the temperature of the core fuel and core coolant, resulting in damage or even melting of the fuel elements, resulting in the release of a large amount of radioactive substances and a nuclear safety accident. Therefore, it is necessary to set up a safety-level waste heat removal system to bring the remaining heat in the core to the final heat sink. Different from pressurized water reactors, liquid metal cooled reactors use metals with low melting points as coolants, such as sodium-potassium alloys, lead-bismuth alloys, etc. These liquid m...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing liquid metal cooling reactor system is complicated and has high construction cost, and is not suitable for the miniaturization and compact arrangement of the reactor.

Images