An anti-loosening bolt assembly and expansion-tightening anti-loosening process for high-radioactive equipment

Abstract

The invention belongs to the technical field of nuclear power stations, and particularly relates to an anti-looseness bolt assembly for high-radioactivity equipment and an expanding type anti-looseness process. The anti-looseness bolt assembly is formed by assembling an anti-looseness bolt A and an anti-looseness cap, the anti-looseness cap rotates along with the anti-looseness bolt A when the anti-looseness bolt A rotates after assembling is carried out, the upper portion of the anti-looseness bolt A is a round boss gasket, the upper end of the round boss gasket is an anti-looseness bolt screwing head, the overall anti-looseness cap is cylindrical, and a positioning hole matched with the anti-looseness bolt screwing head is designed in the middle of the cylindrical bottom. The anti-looseness bolt assembly is used for repairing work after the anti-looseness bolt on the high-radioactivity equipment losses efficiency; and through matched use of related installation tools, underwater long-distance operation is achieved, and anti-looseness repairing work on the bolt on the high-radioactivity equipment at multiple positions is achieved.

Description

technical field [0001] The invention relates to an anti-loosening bolt assembly on high-radioactive equipment and an expansion-type anti-loosening process. The process can complete the installation and anti-loosening of bolts on high-radioactive equipment through remote operations, especially with high doses after operation. On the radiation reactor internals equipment, it can be used to solve the problem of anti-loosening of bolts after replacement. Background technique [0002] At present, the common methods of anti-loosening bolts used on high-radiation equipment are mainly during the equipment manufacturing period. After the bolts are installed, the anti-loosening pins are welded on the bolts, or the anti-loosening caps are installed on the bolts. It is connected by continuous welding, and the installation and anti-loosening work of these bolts are all completed during the processing or installation of the equipment. [0003] Judging from the current status quo, this an...

AI Technical Summary

Problems solved by technology

[0003] Judging from the current status quo, this anti-loosening method has its limitations. After the equipment has been operated for a long time in a radioactive working environment, embrittlement will occur in the body material and weld seam. Under operating conditions, due to various reasons such as the erosion of water flow, the vibration of equipment or the impact of foreign objects entering the system, the anti-loosening structure of the bolts on the original equipment may fail, resulting in the failure of the anti-loosening function or even the bolts falling off.

However, if the bolts with anti-loosening failures are not repaired or replaced, they will continue to operate in high-temperature, high-pressure, high-flow, and strong radioactive working environments, which will cause potential safety hazards to equipment and systems, and even lead to nuclear safety accidents.

[0004] After the equipment has been in operation for a long time, the equipment body has extremely high radioactivity. In the maintenance environment, the operation and maintenance work related to the equipment can only rely on water to shield it, and these equipment can not be used even in a water-shielded environment. Remote operation is required to ensure the safety of operators. According to the current means, this kind of repair work cannot solve the repair problem of anti-loosening bolts by welding anti-loosening pins or anti-loosening caps underwater.

Images