Containment Recirculation System

Abstract

The invention relates to the technical field of nuclear equipment safety, and discloses a containment recirculation system, which includes a containment vessel connected in sequence, a containment filter discharge system, an air discharge mechanism, and a device for temporarily storing discharge gas from the outlet of the containment filter discharge system The retention pipeline, the return pipeline used to return the gas discharged from the outlet of the containment filter and discharge system or the gas temporarily stored in the containment to the containment, the pressure relief pipeline used to pump and discharge the gas in the containment to the containment filter and discharge system . The present invention can not only alleviate the threat of overpressure and hydrogen in the containment vessel and maintain the integrity of the containment vessel under serious accident conditions, but also alleviate the release of fission products and reduce the radioactivity of exhaust gas; in the prevention and mitigation stage of serious accidents , can condense water vapor to realize the function of the containment heat sink, can effectively perform the decompression of the containment at a specified rate, accurately maintain the containment pressure at a given target value, and maintain a small negative pressure in the containment.

Description

technical field [0001] The invention relates to the technical field of nuclear technology safety equipment, in particular to a containment recirculation system. Background technique [0002] According to the nuclear power safety concept of defense in depth and multiple barriers, the containment is the last barrier to prevent the release of radioactive fission products. When a serious accident occurs after the core is damaged, radioactive fission products are released into the containment, and the failure or leakage of the containment will cause the release of fission products to the environment. [0003] The large dry containment vessel of PWR is a pressurized structure, which allows a certain degree of normal leakage. During normal operation, the containment atmosphere control system maintains a small negative pressure in the atmosphere inside the containment, and no leakage to the environment occurs. In the accident analysis, it is usually assumed that the containment is...

AI Technical Summary

Problems solved by technology

[0006] Problem 1. Currently, in the severe accident management of power plants, the purpose of applying the containment filtration and discharge system for active containment discharge is limited to alleviating the threat of overpressure and hydrogen to the integrity of the containment. The reason is that the severe accident management guidelines for power plants (SAMG ) generally refers to the general guidelines of the Westinghouse Owners Group, and Westinghouse power plants generally do not have CFES design. emission;

[0007] The second problem is that according to the current design of CFES, the actively discharged containment gas is discharged to the atmosphere after the containment filtration and discharge system, resulting in the release of radioactivity, which makes the system highly questionable at present

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