Exposure device and radiographic flaw detection method for weld seam radiographic flaw detection center of nuclear power plant

Abstract

The invention relates to the field of nuclear power plant pipe weld flaw detection, and provides an exposure device and a radiation flaw detection method for a nuclear power plant weld seam radiation flaw detection center. The device includes: a source guide sleeve, a drive assembly, a sliding limit sleeve and a positioning lock. The present invention can transilluminate the large-diameter pipeline of the nuclear power plant from the center, so as to perform radiographic flaw detection on the large-thickness weld in the large-diameter pipeline; The exposure device of the flaw detection center can automatically align the radiation source on the central axis of the pipeline aligned with the weld seam, avoiding man-made deviation and saving centering time; at the same time, the operation process of the invention is simple, which effectively reduces the need for multiple deployments by operators. Radiation safety risks that may be brought about during the film, source and inspection process; and save the time of radiographic inspection, improve work efficiency, and optimize the maintenance period of nuclear power plants as a whole.

Description

technical field [0001] The invention belongs to the technical field of nuclear power plant pipeline weld flaw detection, and more specifically relates to an exposure device and a radiation flaw detection method for a nuclear power plant weld seam radiation flaw detection center. Background technique [0002] At present, in the maintenance process of nuclear power plants, according to the requirements of the relevant norms and standards for radiographic flaw detection of welds, if it is necessary to carry out radiographic flaw detection of pipeline welds, and the pipeline has structural characteristics such as large diameter and thick wall, it is usually necessary to Using the conventional double-wall single-image exposure method, the disadvantage of this solution is that the exposure time of the double-wall single-image exposure method is long, which will prolong the entire radiographic flaw detection process, thereby prolonging the maintenance time of the nuclear power plant...

AI Technical Summary

Problems solved by technology

[0002] At present, in the maintenance process of nuclear power plants, according to the requirements of the relevant norms and standards for radiographic flaw detection of welds, if it is necessary to carry out radiographic flaw detection of pipeline welds, and the pipeline has structural characteristics such as large diameter and thick wall, it is usually necessary to Using the conventional double-wall single-image exposure method, the disadvantage of this solution is that the exposure time of the double-wall single-image exposure method is long, which will prolong the entire radiographic flaw detection process, thereby prolonging the maintenance time of the nuclear power plant, and cannot achieve optimal maintenance. The purpose of the construction period; therefore, there is an urgent need for a radiographic inspection method that can save the time of radiographic inspection and provide effective support for the optimization of the overall maintenance period.

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