Special jig for nuclear fuel channel sealing plug

Abstract

The invention discloses a special jig for a nuclear fuel channel sealing plug. The special jig comprises a barrel body, wherein side baffle plates fixed on a barrel wall are arranged on two sides of the barrel body respectively; axial compression bars for compressing the bottom of the sealing plug are installed on the side baffle plates; two oppositely arranged pin holes are formed in the barrel body; the pin holes are formed in the barrel bodies; the pin holes are formed in the barrel body between the two side baffle plates respectively; a pin bolt is inserted in each pin hole respectively; the lower part of a base plate of the barrel is fixedly connected with a square block; a threaded hole running through the base plate of the barrel is formed in the square block; a threaded column is installed inside the threaded hole; the upper end of the threaded column is fixedly connected with a tray; the lower end of the threaded column is fixedly connected with a rotating block; the tray is positioned above the base plate of the barrel and is coaxial with the barrel body. According to the special jig for the nuclear fuel channel sealing plug disclosed by the invention, the sealing plugs can be effectively protected during disassembling and maintenance, the sealing plug is prevented from being damaged by collision of external objects, a spring inside the sealing plug cannot be bouncedviolently during disassembling, the safety performance of the sealing plug during disassembling and assembling is improved, and the special jig is convenient for maintenance workers to operate.

Description

technical field [0001] The invention relates to the field of maintenance equipment for nuclear fuel passages, in particular to a special clamp for sealing plugs of nuclear fuel passages. Background technique [0002] Qinshan Nuclear Power Plant No. 3 is the only heavy water reactor nuclear power plant in the country. Its reactor type is different from other conventional pressurized water reactor types. The end face of the nuclear fuel channel is sealed by the sealing plug. Availability directly affects the normal operation of the reactor, so the inspection of the replaced faulty sealing plug is very strict. The stainless steel part at the upper end of the sealing plug is a sealing disc, which mainly plays a sealing role. The raised part of the outer ring is a sealing surface, which is a part that needs to be protected; The function in the channel; the upper and lower parts of the sealing plug are connected by four nuclear-grade bolts, and there are four springs inside to co...

AI Technical Summary

Problems solved by technology

The nuclear fuel channel needs regular maintenance, and the sealing plug needs to be disassembled and disassembled for maintenance. The maintenance of the sealing plug in the prior art is to directly clamp the sealing plug body with a vise, and use a wrench to disassemble the sealing plug. The risks brought by this are: 1. The nitriding layer of the sealing plug is easy to be damaged if the clamp is too tight, and the bolt is not easy to take off if the clamp is too loose; Requirements, once the sealing surface is damaged, it must be replaced with a new sealing plug; 3. When assembling the sealing plug, there are four springs between the upper and lower shells. 4. During the assembly process of the sealing plug, the vise must be used repeatedly, which will easily cause damage to the sealing plug

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