Nuclear power plant radioactive waste gas treatment system

Abstract

The invention relates to a radioactive waste gas treatment system of a nuclear power plant, comprising a gas cooler, a gas-water separator, a guard bed, a retention bed and a radioactivity monitoring device which are connected in sequence through pipelines. The radioactive waste gas treatment system also includes a water sealing pipe and a heat A nitrogen source is also provided with a water injection funnel above the water seal pipe, one end of the water seal pipe is connected to the bottom of the drain valve of the gas-water separator, and the other end of the water seal pipe is connected to the drain outlet; The guard bed is a silica gel drying bed, and the silica gel drying bed is provided with a hot nitrogen purging interface, and the hot nitrogen purging interface is connected with the hot nitrogen source. The invention effectively reduces the generation of radioactive secondary waste, saves the operation cost of waste treatment and replacement of new silica gel, and at the same time, the addition of the water sealing pipe can avoid the malfunction of the valve during normal operation, the failure of the valve to be closed in time before putting into operation, and the poor sealing. Potential risk of leakage of radioactive hydrogen-containing exhaust gas, prolonging the service life of major equipment.

Description

technical field [0001] The invention relates to the treatment of radioactive waste gas of nuclear power plants, and more specifically relates to a radioactive waste gas treatment system of nuclear power plants using active carbon retention and decay. Background technique [0002] The nuclear power plant core will produce radioactive nuclides, such as Xe, Kr, etc., during nuclear fission reactions. These fission products will leak into the reactor coolant when the cladding is damaged, and migrate and diffuse to the entire primary circuit with water movement; , pressure changes, radioactive fission gas will be precipitated from the coolant and enter the gas phase space to form radioactive waste gas. Such waste gas usually needs to be treated before it can be discharged into the environment. [0003] At present, there are mainly two methods for the treatment of the above-mentioned radioactive waste gas: pressurized storage decay and activated carbon retention decay. The pressu...

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a nuclear power plant radioactive waste gas treatment system using activated carbon retention and decay, which solves the problem of small water absorption capacity and frequent replacement of the activated carbon protection bed, and at the same time solves the problem of easy misoperation of the gas-water separator

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