Passive residual heat removal system based on water cooler

Abstract

The invention discloses a passive residual heat removal system based on a water cooler. An annular water cooler which is compactly arranged around a reactor pressure vessel is adopted, reactor core residual heat is brought out, a circulating heat removal water tank is divided into a hot area and a cold area, the tops of the hot area and the cold area are in two-way communication, and a one-way flow device is arranged at the bottom of the hot area and the cold area. Therefore, cold fluid can only flow from the hot area to the cold area, water vapor can be discharged through an exhaust pipe at the top of the one-way flow device, and the natural circulation capacity between the circulating heat removal water tank and the annular water cooler is enhanced. Hot fluid in a water cooling pipe serves as an ascending section, cold fluid in an annular descending cavity serves as a descending section, natural circulating flow is formed by means of the potential difference and the density difference of the cold fluid and the hot fluid, water vapor formed in the hot area of the circulating heat removal water tank is discharged through an exhaust pipe at the top of the circulating heat removal water tank, and normal shutdown or accident shutdown of a reactor core is achieved. Residual heat in the reactor core is discharged more safely and reliably, and it is guaranteed that the temperature ofa fuel cladding, a pressure vessel and the wall face of a reactor cavity does 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...

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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.

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