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[ China Instrument Network Instrument Development ] Recently, the ultrasonic test results of the stainless steel weld phased array of Guangdong Yangjiang Nuclear Power Plant were released. After verification, the test results were consistent with the results of the radiographic inspection, which marked the radiation of the Yangjiang Nuclear Power Plant in the legal weld inspection of conventional islands. The flaw detection will be replaced by phased array ultrasonic testing technology.
Radiographic inspection is a non-destructive testing method that uses X-rays or gamma rays to inspect internal weld defects and is widely used in industry. However, due to the need to use a radioactive source, radiographic inspection also inevitably has shortcomings such as long preparation time, tight working window, and large isolation area. For nuclear power plants, each time a radiographic inspection is performed on a conventional island, the entire conventional island plant is closed. Therefore, radiographic inspection has become a work that can only be carried out at night, which restricts the optimization of the critical path of conventional island overhaul.
In order to improve the management of conventional island overhaul, Yangjiang Nuclear Power seeks innovation and innovation, and has taken the lead in research and introduction of ultrasonic phased array technology in the domestic nuclear power industry. Compared with radiographic inspection, phased array ultrasonic inspection technology has great advantages: first, real-time color imaging, easy to interpret; second, it can achieve multiple scans, detection speed is faster; third, it has higher flexibility, can It should deal with the more complicated structure of the workpiece; the fourth is that the device is simpler and convenient to operate, effectively avoiding the problem of false exposure risk and boundary isolation of radiographic inspection. At the same time, phased array ultrasonic testing data can be stored as well as radiographic negatives for easy management and application.
In 2017, Yangjiang Nuclear Power took the lead in mastering the application of phased array technology in carbon steel weld inspection. In the process of testing more than 280 welds, it saved more than 220 hours, and the advantages of ultrasonic phased array technology. Got a significant manifestation. Since then, Yangjiang Nuclear Power has continued to charge for the application of phased array technology in the detection of stainless steel welds. After nearly a year of hard work, in order to overcome the problems of no precedent reference, no test standards, and technical differences between phased array and radiation detection, the project team produced a large number of different specifications, including cracks, unfused, Simulated test tubes with different defects such as incomplete penetration, according to the computer simulation test process test results, different ultrasonic equipment, probe devices and other relevant parameters are selected, and the test results are compared and tested on the test tube, and finally a set of standardized phases is established. The control array detection process has passed the expert review, and the Yangjiang Nuclear Power Plant has the ability to apply phased array detection technology in stainless steel weld inspection.
In order to fully verify the reliability of the phased array technology, Yangjiang Nuclear Power conducted the phased array technical test on the 45 stainless steel welds during the third overhaul of the No. 2 unit (Y203). Finally, the phased array test results of 45 welds were consistent with the results of radiographic inspection, and the application of stainless steel weld phased array inspection technology was successful.
(Original title: Yangjiang Nuclear Power uses phased array ultrasonic technology to detect conventional island welds)