Recycling device of light water coupling agent for supersonic inspection on heat transfer branch pipe of heavy water reactor power station

Abstract

The invention belongs to the technical field of nuclear station in-service inspection, and specifically relates to a recycling device of a light water coupling agent for the supersonic inspection on a heat transfer branch pipe of a heavy water reaction power station. The device comprises a water receiving disc, a water tank, a filter core, and a water pump. The wedge-shaped water receiving disc is inserted into a gap between fuel channels and is connected to one end of a recycled water soft pipe, the other end of the recycled water soft pipe is arranged above the filter core, the filter core is arranged in the water tank, the lower end of a water supply soft pipe is arranged in the water tank, and the upper end of the water supply soft pipe goes through the filter core and is connected to a supersonic inspecting probe through the water pump. The provided device can recycle a light water coupling agent, which is used in the supersonic inspection on a heat transfer branch pipe of a heavy water reaction power station. The provided device can reduce the surface pollution in the job site, reduce the amount of wetted thermal insulation cotton, and relieve the panic of non-staff members on the on-site water, when they have no idea on the on-site situation.

Description

Technical field [0001] The invention belongs to the technical field of in-service inspection of nuclear power plants, and particularly relates to a light water couplant recovery device for ultrasonic inspection of heat transmission branch pipes of heavy water reactor nuclear power plants. Background technique [0002] The reactor of the CANDU6 heavy water reactor nuclear power plant is composed of 380 horizontally arranged fuel channels, and each fuel channel is connected with a heat transfer branch pipe. The nuclear power plant needs to conduct regular in-service inspections (ultrasonic inspection) of the heat transfer branch pipes. Ultrasonic inspection needs to be used As a couplant, the light water will flow down along the outer wall of the heat transfer branch pipe, and finally wet the insulation cotton in the lower part of the fuel channel and flow to the ground to cause surface water. Considering the following four factors, light water needs to be recovered: First, a large...

AI Technical Summary

Problems solved by technology

Considering the following four factors, it is necessary to recycle light water: First, a large amount of light water will increase the load of the steam recovery system in the reactor building, which will increase the concentration of tritium in the reactor building

Second, a large amount of light water will degrade the recovered heavy water

Third, wetting the insulation cotton in the lower part of the fuel channel with light water will increase the workload and collective dose of replacing the insulation cotton

Fourth, the personnel inside the nuclear island are very sensitive to the water found in the field, and the discovery of light water by non-members of this working group will cause unnecessary panic

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