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Radiographic testing method for welding beams under radioactive environment of nuclear power station

A technology of radiation detection and radioactivity, which is applied in the field of radiation detection, can solve the problems that the classical method of detection and positioning accuracy cannot meet the requirements of nuclear power, and the film positioning accuracy cannot meet the requirements of nuclear power, so as to reduce time, facilitate continuous work, and improve accuracy.

Inactive Publication Date: 2012-10-31
CGNPC INSPECTION TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the sensitivity and defect positioning accuracy of general negatives cannot meet the requirements of nuclear power; most of the welds inspected in nuclear power are surface-polished welds, and the detection and positioning accuracy of classic methods can no longer meet the requirements.

Method used

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  • Radiographic testing method for welding beams under radioactive environment of nuclear power station
  • Radiographic testing method for welding beams under radioactive environment of nuclear power station
  • Radiographic testing method for welding beams under radioactive environment of nuclear power station

Examples

Experimental program
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Effect test

Embodiment 1

[0058] Embodiment 1: A radiation detection method for welds in a radioactive environment, used to detect such as attached figure 1 Weld 1 of large diameter pipe 3 is shown. Representative welds are the evaporator and reactor main pipe welds and all pipe welds that can be center exposed.

[0059] The radiographic detection method includes three stages of preparation, operation and post-processing. In the preparation stage, it includes preparation marking system, dark bag system, exposure system, auxiliary accessory system and data calculation system.

[0060] The marking system includes a lead ruler 5 for positioning the weld seam 1, and the lead ruler 5 includes lead characters for circumferentially positioning the weld seam 1 and lead strips for axial positioning, wherein the lead characters are lead numbers and the lead characters are evenly arranged in the length direction , wherein the lead strips are arranged between adjacent lead characters, and the image quality meter...

Embodiment 2

[0068] Embodiment 2: A radiation detection method for welds in a radioactive environment, used to detect such as attached by radiation detection methods in a radioactive environment Figure 5 The weld seam 1 of the pipe socket of the pressure vessel 2 is shown. The pressure vessel 2 is spherical, and the welding seam 1 is annular on the spherical surface. The representative welds are the welds of the tube sockets of various parts of the voltage stabilizer equipment.

[0069] The radiographic detection method includes three stages of preparation, operation and post-processing. In the preparation stage, it includes preparation marking system, dark bag system, exposure system, auxiliary accessory system and data calculation system.

[0070] The marking system includes marking stickers 6. The marking stickers 6 include lead characters for circumferential positioning of 1, lead strips for radial positioning of 1, hidden bag alignment lines and markings for overlapping steel stamp...

Embodiment 3

[0078] Embodiment 3: A radiographic detection method for welds in a radioactive environment, which is used to detect the weld 1 of a small-diameter pipeline 4 by means of a radioactive detection method in a radioactive environment. The representative welds are the welds of the nozzle of the voltage stabilizer and the upper head, the welds of the secondary and tertiary components and the double-wall transilluminated pipes of the auxiliary pipeline.

[0079] The radiographic detection method includes three stages of preparation, operation and post-processing. In the preparation stage, it includes preparation marking system, dark bag system, exposure system, auxiliary accessory system and data calculation system.

[0080] Similar to the detection of the large-diameter pipeline 3 , the marking system includes a marking tape 9 for circumferentially positioning the weld 1 , a lead strip for axially positioning the weld 1 , and an image quality meter. Lead type is marked on the mark...

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Abstract

The invention relates to a radiographic testing method for welding beams under the radioactive environment of a nuclear power station. The radiographic testing method is used for testing the welding seams through rays under the radioactive environment. The radiographic testing method comprises three stages of preparation, operation and after-treatment, wherein the preparation of a tag system, the assembly of a hidden bag system, the debugging of an exposure system, the manufacture of an auxiliary accessory system and the budgeting of a data computing system are involved in the preparation stage; in the operation stage, a lead rule and a tag identification label are connected near the welding seams to locate the welding seams, the hidden bag system is fixed so as to cover the welding seams, and a spherical center exposure method or a central exposure method or a double-wall single image exposure method or a double-wall double-image exposure method is adopted for imaging on a photographic film; and in the after-treatment stage, the photographic film is processed into a negative film, and the negative film is evaluated. The radiographic testing method has the advantages that the working procedures and tools in the traditional radiographic testing processed are optimized, the accuracy is high, less time is consumed, the imaging quality is high, and the transillumination risk of workers in a high radiation region is effectively reduced.

Description

technical field [0001] The invention relates to a radiation detection method for detecting welds in a radioactive environment. Background technique [0002] The existing methods of non-destructive testing of welds are usually carried out under normal natural conditions, and there is no strict time limit for preparation, process and post-processing. However, when these classical methods are applied to the detection of related equipment in nuclear power plants, they have the following problems: [0003] 1. The working hours are strictly limited: Due to the limited working hours of each person in the radiation environment, all prepared items must be simple, light, easy to operate and accurate, and all the prescribed processes must be completed within the specified time. The classic method lacks the working time. Requirements, so that the risk of personnel exposure is increased when used in a nuclear power environment; [0004] 2. Radiation protection and industrial safety: Du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/04
Inventor 叶峰陈小亮张铁辉刘森曹志军刘顺
Owner CGNPC INSPECTION TECH
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