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Method for measuring parameter of omega welding seam defect

A technology of parameter measurement and defect, which is applied in the direction of measuring device, material magnetic variable, and material analysis using sound wave/ultrasonic wave/infrasonic wave, etc. It can solve the problem of inability to accurately quantify defects, inability to detect Ω weld defects, and inability to meet preventive maintenance and other issues to achieve the effect of ensuring accuracy and repeatability

Active Publication Date: 2010-03-17
STATE NUCLEAR POWER PLANT SERVICE
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Problems solved by technology

[0003] Previously, due to the lack of corresponding detection technology, the inspection of Ω welds only carried out liquid penetrant inspection on the outer surface. This inspection method can only detect the opening defects on the outer surface, but cannot detect the defects inside the Ω welds, let alone detect the defects. Accurate quantitative, can not meet the needs of preventive maintenance

Method used

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  • Method for measuring parameter of omega welding seam defect
  • Method for measuring parameter of omega welding seam defect
  • Method for measuring parameter of omega welding seam defect

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specific Embodiment approach

[0019] The specific implementation method of the Ω weld defect quantification of the control rod drive mechanism of the nuclear power plant is as follows:

[0020] like figure 1 As shown, 1 is the Ω weld existing in the upper, middle and lower parts of the control rod drive mechanism.

[0021] Preparation of Ω weld comparison test block

[0022] Use the Ω weld 1 welding process qualification test piece to make a comparison test block, which is used to calibrate the ultrasonic and eddy current testing system during the testing process, see figure 2 As shown, the steps are as follows:

[0023] ① On the center line of the inner and outer surfaces of the Ω weld 1, six circumferential electric spark grooves with a height of 1mm, 1.5mm and 2mm, a width of 0.7mm and a length of 25mm were processed respectively, that is, the circumferential inner groove 2 and the The circumferential outer groove 3 of the comparison test block is used to simulate linear defects along the direction ...

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Abstract

The invention relates to a method for measuring the parameter of an omega welding seam defect, in particular to a method for measuring the parameter of an omega welding seam defect, which is applied to a control rod drive mechanism of a nuclear power plant. The method adopts a welding technique estimation test piece of the omega welding seam to manufacture a contrast test block, adopts an automatic detection device containing an ultrasonic detection method and a vortex detection method to measure the parameter of the defect and judges the parameter of the defect integrally. The method can effectively measure the parameter of the omega welding seam defect of the control rod drive mechanism of the nuclear power plant accurately, provides data support for the preventive maintenance of the control rod drive mechanism, provides guarantee for the nuclear safety and is suitable for detecting the parameter of the welding seam defect in nuclear industry system.

Description

technical field [0001] The invention relates to a method for measuring parameters of Ω weld defects, in particular to a method for measuring parameters of Ω weld defects in a control rod drive mechanism of a nuclear power plant, which belongs to the non-destructive measurement of objects. Background technique [0002] The control rod drive mechanism is a component that drives the control rods to move up and down in the reactor core, and is used for the start-up, shutdown, power regulation, etc. of the reactor. Due to structural reasons, there are Ω welds in the upper, middle and lower parts of the control rod drive mechanism. Due to the special structural shape of the Ω welds, defects such as incomplete fusion and incomplete penetration are easily produced during the welding process, and nuclear power plants During operation, the Ω weld is in a vibration environment for a long time, and its interior is affected by high temperature and high pressure as well as the medium in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/30G01N27/90G01N27/9013
Inventor 李劲松严智毕炳荣李卓群夏炜铭许峰叶琛卞雪飞袁光华曹刚张宝军
Owner STATE NUCLEAR POWER PLANT SERVICE
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