Roll-expanding mechanical plug for steam generator heat transfer tube of nuclear power plant and manufacturing method thereof

Abstract

Provided are a roll expanding type mechanical plug for a nuclear power station vapor generator heat transfer pipe and a manufacturing method thereof. The mechanical plug comprises an upper pipe body and a lower pipe body which are communicated, the upper end of the upper pipe body is open, the lower end of the lower pipe body is closed, a plasma coating is coated on the outer wall of the upper pipe body, and a gap is formed between the plasma coating and the top of the upper pipe body. The plug adopts the micro lock design and is quick in installation, a material of the plug is consistent with a material of a heat transfer pipe, and the plug is high in corrosion resistance and easy to detach, does not damage the inner wall of the heat transfer pipe, can be welded with the heat transfer pipe in an overlaying mode, can achieve automatic pipe blocking remotely and protects workers from nuclear radiation. By means of the manufacturing method, the roll expanding type mechanical plug meeting the requirement can be manufactured, butt welding gaps do not exist, the corrosion resistance is good, the service life is long, and the user installation performance is good.

Description

technical field [0001] The invention belongs to the technical field of nuclear power, and in particular relates to a roll-expanding mechanical plug for a steam generator heat transfer pipe of a nuclear power plant and a manufacturing method thereof. Background technique [0002] Nowadays, the use of nuclear energy in the world is becoming more and more widespread, and it has great potential for both civilian and military uses. Corrosion and damage of steam generator heat transfer tubes in nuclear power equipment has always been the main factor for unplanned shutdown and capacity factor loss of nuclear power plants. The heat transfer tubes of these steam generators are often corroded and damaged during use. For more than 20 years, countries have adopted different pipe plugging technologies, such as explosion pipe plugging, welding pipe plugging and mechanical pipe plugging. Explosive pipe plugging and welding pipe plugging methods belong to permanent pipe plugging or semi-p...

AI Technical Summary

Problems solved by technology

Although this manufacturing process is simple and feasible, due to the presence of welds in the cylinder, it is easy to tear from the welds during installation and to corrode and fail from the welds during use, which greatly affects the use effect and quality of the plug. life

At the same time, the method of hot spinning or cold spinning is very difficult in domestic technology at this stage, and it is not easy to form

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