Two-dimensional guide vane reset repair device

Abstract

The invention relates to a repair tool for a damaged fuel assembly after irradiation of a pressurized water reactor nuclear power plant, in particular to a two-dimensional guide vane reset repair device for repairing a local slight damage of a location grid fencing plate. A group of symmetric faces of a frame are provided with slide ways respectively; a correction reset ejecting block is arranged in the slide way of the frame; a cover plate is arranged outside one side of another group of symmetric faces of the frame and is provided with a shaft lever with a gear by means of a bearing; the side provided with the cover plate on the frame and a side plate connected with the cover plate are provided with a transmission rod with a tooth plate; the correction rest ejecting block in the frame is connected with a transmission rod with the tooth plate outside the frame; the tooth plate on the transmission rod is matched with the gear on the shaft lever; and the correction reset ejecting block can slide on the slide way of the frame under the action of the transmission rod. Correction processing of a location grid with local slight damage and individual deformed and warped guide vane of the fencing plate is realized, and the safety for loading and unloading of the damaged fuel assembly after irradiation of the pressurized water reactor nuclear power plant is effectively guaranteed.

Description

technical field [0001] The invention relates to a repair tool for a damaged fuel assembly after irradiation in a pressurized water reactor nuclear power plant, in particular to a two-dimensional guide wing reset repair device for replacing and repairing damaged fuel rods and positioning grid coaming plates. Background technique [0002] During the refueling process of nuclear power plants, it is sometimes found that the reusable fuel rods are damaged and the fuel assembly positioning grid coamings are damaged to varying degrees. Both refueling and overhaul schedules have a significant impact. Leakage of damaged fuel rods will lead to the leakage of radioactive fission products into the primary circuit coolant, resulting in an increase in the radioactive level of the system and unnecessary radiation doses for the staff. In principle, the damaged fuel assemblies are not allowed to re-enter the reactor considering the risk control of operational safety. run. The local slight ...

AI Technical Summary

Problems solved by technology

[0005] In the basic process of the repair process: the repair of the local slight damage to the spacer grid coaming of the fuel assembly after irradiation and the replacement of the skeleton after the serious damage to the spacer grid coaming are not considered, and the repair process is also imperfect. For example: before repairing the damaged component, no underwater TV visual inspection was carried out to confirm whether the component is eligible for repair. After the damaged component was replaced and repaired, only the sip leakage inspection was carried out, and the underwater TV visual inspection was not carried out, especially the lack of deformation inspection means To evaluate the deformation of the repaired components, etc.

[0006] In addition, reflective mirrors and telescopes are used to monitor and confirm the operation underwater. This operation is inconvenient, the underwater observation is not very clear, and the means for monitoring and confirming the underwater operation are insufficient; The Lissajous graph of the defect signal cannot be stored and recorded, and the signal curve can only be recorded by the paper recorder. The signal cannot be played back, and there is a disadvantage that the defect signal cannot be stored, recorded and analyzed. To review the defect, it is necessary to repeatedly pull out the fuel rod. This is not only time-consuming and labor-intensive, but also likely to cause damage to the rigid protrusions of the fuel single rod and the spacer grid, and the risk is great

Images