Non-destructive inspection circumferential position correction method for thread hole belt of nuclear reactor pressure vessel

Abstract

The invention belongs to the technical field of automatic ultrasonic non-destructive inspection for a thread hole belt of nuclear reactor pressure vessels, and particularly discloses a non-destructive inspection circumferential position correction method for the thread hole belt of a nuclear reactor pressure vessel. The non-destructive inspection circumferential position correction method comprises the following steps: step 1. setting a plurality of key slots supporting steps on the nuclear reactor pressure vessel to position references; step 2. installing induction components in the key slots set to the position references; step 3. when a non-destructive inspection trolley for the thread hole belt of the nuclear reactor pressure vessel passes through the induction components, providing the real circumferential position of a scanning trolley by the induction components; and step 4. comparing the real circumferential position of the trolley, which is provided by the induction components with a measured circumferential position which is measured during the own movement process of the trolley by the scanning trolley to carry out circumferential position correction. According to the non-destructive inspection circumferential position correction method disclosed by the invention, the errors of inspection for the circumferential movement position of the trolley can be timely eliminated, the scanning inspection accuracy can be improved, potential safety hazards can be timely found, accurate location can be realized, and a support is provided for the subsequent working.

Description

technical field [0001] The invention belongs to the technical field of automatic ultrasonic non-destructive inspection of threaded hole bands of nuclear reactor pressure vessels. Background technique [0002] The threaded hole belt of the nuclear reactor pressure vessel is located at the top of the vessel, and several bolt holes are evenly distributed on it. During the operation of the pressure vessel, the top cover is fastened on it and fastened with bolts and nuts. The quality of the material properties between the bolt hole and the connection between the hole and the hole directly affects the fastening reliability of the pressure vessel and the top cover, and then affects the safety performance of the pressure vessel. According to the requirements of ARSM, it is required to carry out non-destructive testing on threaded hole strips on a regular basis. [0003] There are many ways to carry out non-destructive testing on the threaded hole belt on a regular basis, one of whi...

AI Technical Summary

Problems solved by technology

Due to the principle of this wheel movement, between the wheel and the object to be inspected, in addition to the rolling motion, there will be slippage, which will not be encoded by the encoder wheel, resulting in errors, and the encoder wheel will follow The increase in the number of scanning steps will accumulate this error, which will affect the scanning accuracy

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