A passive online rehydration device and method for containment filtration and discharge system

Abstract

The invention provides a passive online rehydration device and method for a containment filtration and discharge system, which includes a plurality of rehydration tanks and rehydration pipelines. There is washing solution in the liquid replenishment tank; one end of the liquid replenishment pipeline is connected to several of the liquid replenishment tanks and the other end is connected to the Venturi water washing container, and the water washing solution in the liquid replenishment tank can be filled into the Venturi water washing container. Inside the container, rehydrate the venturi wash container. The invention improves the safety, reliability and convenience of liquid replenishment in the process of filtering and discharging, and ensures the safe operation of the filtering and discharging system under more severe conditions after serious accidents.

Description

technical field [0001] The technical invention relates to the field of nuclear power plants, in particular to a passive online rehydration device and method for a containment filtration and discharge system. Background technique [0002] When the containment is overpressurized after a serious accident, elemental iodine, dissolved aerosol and dissolved organic iodine in the exhaust gas will be retained by the chemical solution of the Venturi scrubber installed outside the shell. Specific self-sustaining time and minimum required liquid level. When the liquid level is lower than the minimum liquid level, it is necessary to replenish the Venturi washer to maintain its effective filtration and washing function. [0003] At present, the liquid replenishment devices used in nuclear power units include mobile active chemical liquid replenishment devices and fixed active chemical liquid replenishment devices. The mobile active chemical replenishment device introduces the water sour...

AI Technical Summary

Problems solved by technology

[0004] However, the rehydration process of the mobile rehydration device requires the cooperation of many personnel, and after a serious accident, personnel will manually connect the relevant mobile connection tubes, which takes a long time and increases the risk of radiation exposure for personnel on site.

At the same time, it will also lead to the need to reserve additional external connection ports for the plant structure, which poses a challenge to the integrity and sealing of the plant

The mobile rehydration device is transported by vehicle, consuming precious transportation resources in the factory area after the accident

The fixed liquid rehydration device needs to be equipped with an additional and reliable power source. At the same time, the active liquid rehydration process requires personnel to enter the nuclear island plant for operation, and may also involve post-accident maintenance matters, resulting in an increased risk of radiation exposure for personnel on site.

Considering the problem of personnel shielding, the design of the shielding wall will be more complicated, consuming more material costs, engineering costs and construction period costs

[0005] Therefore, in order to solve the technical problems existing in the prior art, such as the need for personnel to enter the nuclear island plant for operation, and the need for additional power distribution design, there is an urgent need to seek a passive online rehydration system for the containment filtration and discharge system of nuclear power plants and method to improve the safety, reliability and convenience of rehydration during filtration and discharge

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