Automatic ultrasonic detection equipment for weld defects of connecting pipe and safe end of pressure vessel of nuclear power station

Abstract

The invention relates to automatic ultrasonic detection equipment for weld defects of a connecting pipe and a safe end of a pressure vessel of a nuclear power station. The automatic ultrasonic detection equipment comprises a detecting device and a gas line control device, etc. The detecting device further comprises a buoyancy mechanism, a positioning and compressing mechanism, an axial feeding and circumferential rotating mechanism and a checking mechanism, wherein the gas line control device mainly comprises an overflowing valve, a pressure reducing valve, an electric proportion valve, a five-way valve and the like. The detection equipment provided by the invention is small in structure and convenient to transport, can position and quantify the defects by scanning at one time without replacing an end part effective apparatus, and can be applied to detection of the weld defects of the connecting pipes and the safe ends of the nuclear power stations with different reactor types.

Description

technical field [0001] The invention relates to an ultrasonic automatic detection device, in particular to an ultrasonic automatic detection device applied to welding seam defects at the safety end of a pressure vessel of a nuclear power plant, belonging to a nuclear detection system. Background technique [0002] The reactor pressure vessel nozzle safety end of a nuclear power plant is the transition section between the reactor pressure vessel nozzle and the main pipeline, and is an important part of the reactor coolant pressure boundary. There are two welds on both sides of the safety end, that is, the weld between the safety end and the takeover pipe and the weld between the safety end and the main pipe. The welding seam at the safety end is close to the active area of ​​the core, and it must bear the alternating and complex stress and corrosion of high temperature, high pressure and high radiation during the operation of the nuclear power plant. Therefore, the quality o...

AI Technical Summary

Problems solved by technology

At present, the domestic detection of the weld is mainly realized through the ten-year overhaul of the reactor pressure vessel. The main problems are: the long detection period, which cannot meet the detection frequency of the weld; the equipment is huge, and the ten-year overhaul detection device needs Detecting a variety of weld defects, so the testing equipment is very large, requiring dozens

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