Containment suppression and water washing filtration integrated system

Abstract

The invention relates to a secure shell suppression and water-washing filtering integration system. The secure shell suppression and water-washing filtering integration system comprises a secure shelland a suppression water tank; the upper part of the suppression water tank is provided with a gas space, and the lower part of the suppression water tank is filled with water; the secure shell is communicated with the lower part of the suppression water tank through a spray pipe; the spray pipe comprises an inlet section, a shrinkage section and a throat pipe which are connected with one anothersequentially; the diameter of the throat pipe is less than that of the inlet section; the diameter of the shrinkage section is gradually shrunk; a cooling water inlet is formed above the throat pipe;when break accidents occur, mixed steam containing radioactive substances enters the suppression water tank through the spray pipe to realize rapid pressure relief of the secure shell; cooling water in the suppression water tank enters the throat pipe through the cooling water inlet and is atomized under the action of high-speed gas flow; and the radioactive substances are removed through collision of the cooling water and the radioactive substances in the mixed steam. A secure shell suppression system and a water-washing filtering system are integrated, double functions of rapid pressure relief and water-washing filtering are realized through the suppression water tank and the specially designed spray pipe, and the demand of the system on the total resources is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of nuclear power device containment environment and pressure control, in particular to a containment pressure suppression and water washing filtration integrated system. Background technique [0002] The containment is the last barrier for the nuclear power system to achieve radioactive containment. At any time, it is necessary to prevent the uncontrolled release of radioactive substances caused by the overpressure rupture of the containment structure. For small nuclear power plants such as icebreakers and floating power plants, due to overall resource constraints, the free volume of the containment vessel is much smaller than that of a nuclear power plant. The pressure inside the shell will rise rapidly within tens of seconds and exceed the design pressure of the containment. At present, nuclear power plants generally use spray or passive containment cooling systems to deal with breach accidents. For small ...

AI Technical Summary

Problems solved by technology

For small nuclear power plants such as icebreakers and floating power plants, due to overall resource constraints, the free volume of the containment vessel is much smaller than that of a nuclear power plant. The pressure inside the shell will rise rapidly within tens of seconds and exceed the design pressure of the containment. At present, nuclear power plants generally use spray or passive containment cooling systems to deal with breach accidents. For small nuclear power plants, they cannot It is equipped with a super-large flow spraying system and a super-high-power passive stack cooling system, and it takes a certain amount of time to start the spray system and establish a natural circulation in the passive stack cooling system, and its heat removal rate is also much lower than the mass energy of the breach. The rate of release, so it cannot meet the requirements of rapid depressurization of the stack

In addition, if the radioactive substances released during the breach accident are not removed in time, there is a danger of leakage at any time.

[0003] At present, power stations generally use sand bed filters, metal fiber filters, etc. to remove airborne radioactive substances, but this type of filter is relatively large in volume and supporting facilities, and occupies more overall resources

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