Pressurized water reactor nuclear power plant reactor core checking tool

Abstract

The invention belongs to the technical field of nuclear power plant nuclear fuel management, and particularly relates to a pressurized water reactor nuclear power plant reactor core checking tool, which comprises an adapter, a radiation-resistant underwater camera and a storage frame, wherein one end of the adapter can be conveniently grabbed by a loading and unloading machine, the other end of the adapter is connected with the radiation-resistant underwater camera, the storage frame temporarily stores the radiation-resistant underwater camera with the adapter in a loader in a reactor refueling pool, and the pressurized water reactor nuclear power plant reactor core checking tool further comprises an integrated electrical cabinet and a display connected with the radiation-resistant underwater camera. According to the pressurized water reactor nuclear power plant reactor core checking tool, the adapter device is connected with the underwater camera, and the grabbing device of the loading and unloading machine direct grabs the adapter and the camera to inspect, so that the underwater long rod device is replaced so as to avoid the adapter and the camera from being sucked by the pressure container water outlet to improve the inspection safety; and by using the radiation-resistant underwater camera, the definition is greatly improved, and the main line time for checking is saved.

Description

technical field [0001] The invention belongs to the technical field of nuclear fuel management in nuclear power plants, and in particular relates to a core inspection tool for pressurized water reactor nuclear power plants. Background technique [0002] The pressurized water reactor nuclear power plant unit needs to be refueled during each overhaul. In order to ensure the position and direction of the fuel assemblies loaded into the core in the next cycle and the related components mated correctly, the core must be carried out every time during the overhaul. Verification work. This work is carried out immediately after the completion of material loading, which is the time for the main line of overhaul, and the general construction period is about 3 hours. [0003] At present, most domestic pressurized water reactor nuclear power plants use a set of underwater long-rod video devices to check the core fuel assemblies. Rods (generally 4-5 knots) are connected to lower the und...

AI Technical Summary

Problems solved by technology

[0004] The long rod tools need to be manually assembled and connected on the loading and unloading machine, and the interface between the long rod and the railing of the loading and unloading machine does not match well, and the last long rod must be assembled above the core, and there is a possibility that the connecting rod may fall into the core. risk;

[0005] The long rod system is fixed to the railing of the loading and unloading machine, and it is necessary to manually move on the railing after each inspection of a row / column of the core, which increases operational risks

And there are other things such as radioactive detection cabinets on the railing of the loading and unloading machine, and some positions interfere with the connecting part of the long pole, so the direction of the underwater camera has to be adjusted to check obliquely, which affects the inspection effect;

[0006] The entire underwater long rod device is connected by multiple long rods, so the overall rigidity is not enough, and it is easy to be bent by the suction force of the water outlet of the pressure vessel during the core inspection. After the core of 101 and 202 of a power plant was overhauled and loaded During the inspection, the underwater camera was almost sucked into the water outlet of the pressure vessel. The long rod had been bent a lot when it was sucked in. Once it broke, the entire underwater camera and part of the long rod would be sucked into the primary circuit, resulting in unsafe Estimated Impact and Loss

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