Underwater operation device for grabbing end part fitting of nuclear fuel assembly

Abstract

The invention relates to the technical field of a grabbing operation device of an end part fitting of a damaged fuel assembly after irradiation in the repairing process, and in particular discloses an underwater operation device for grabbing the end part fitting of a nuclear fuel assembly. The device comprises an upper outer sleeve, a core rod and a lower outer sleeve; a retainer ring is arranged between the upper outer sleeve and the lower outer sleeve which can rotate respectively; the opposite angle of the sleeve wall of the lower outer sleeve is provided with a limiting hole; the core rod penetrates through the upper outer sleeve and the lower outer sleeve; a cylindrical pin penetrates through the limiting hole and the core rod on the lower outer sleeve, and is fixed on the core rod; the lower end of the core rod extends out of the lower outer sleeve and a 'cross-shaped' structural grab head is fixed on the lower end of the core rod. The device can freely pass in and out the end part fitting, and can clamp the end part fitting after rotating for certain angle; and simultaneously, the limiting hole on the lower outer sleeve can ensure the rotation angle and the lifting height of the core rod and the grab head, the device is convenient to operate, the state of the device is convenient to confirm, and the underwater grabbing problem of the end part fitting of the neclear fuel assembly is solved.

Description

technical field [0001] The invention belongs to the technical field of grabbing and operating devices for end fittings in the process of repairing damaged fuel assemblies after irradiation, and in particular relates to an underwater operating device for grabbing end fittings of nuclear fuel assemblies. 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 damag...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an underwater operation device for grabbing the end fittings of nuclear fuel assemblies, which can solve the underwater grabbing problem of the end fittings of nuclear fuel assemblies

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