Method for ultrasonically detecting weld quality of main loop pipeline of nuclear power plant by phased array

Abstract

The invention discloses a method for ultrasonically detecting the weld quality of a main loop pipeline of a nuclear power plant by a phased array and belongs to the technical field of ultrasonic non-destructive detection and evaluation. According to the method, a phased array ultrasonic test system composed of a Dynaray Lite ultrasonic phased array tester, an integrated UltraVision3.2R9 phased array operation system, a scanning device and a calibration block is adopted. Aiming at the main pipeline having a thickness of 66-99 mm, a proper area array probe is selected, and a focusing principle parameter, an ultrasonic parameter and a mechanical parameter are matched, so as to perform layered detection on a weld of the main pipeline and the peripheral region. Layered permeation in the existing means for detecting the main pipeline is only capable of detecting the surface open defects of the weld; radiographic detection is incapable of quantifying defect depths and insensitive to area defects such as cracks and incomplete fusion; and the conventional ultrasonic detection technology has the defects of being low in detection efficiency, high in cost, low in imaging capacity and the like. The method disclosed by the invention overcomes the defects is good in quantifying accuracy and high in efficiency in field detection, and has great economic benefits and social benefits.

Description

technical field [0001] The invention relates to a method for detecting the weld seam quality of a main loop pipeline of a nuclear power plant by using phased array ultrasound, which belongs to the technical field of ultrasonic nondestructive testing and evaluation. Background technique [0002] The centrifugal casting austenitic stainless steel (Centrifugal Casting Austenitic Stainless Steel, CCASS) with a wall thickness of 66-99 mm is one of the main materials used in the primary circuit coolant pipes of pressurized water reactor nuclear power plants. Whether it is good or bad is directly related to the safety and reliability of nuclear power plant operation. In the inspection specification and outline (IWA-2232APP.I) of nuclear power plants and nuclear power plants, mandatory requirements for non-destructive testing are put forward for the processing quality of the main circuit pipeline welds and the conditions during service. The research and development of accurate and ...

AI Technical Summary

Problems solved by technology

However, layered penetration can only detect opening defects on the surface of the weld, and the detection procedure is cumbersome, slow, and long. Radiographic detection is harmful to the human body, and it is not sensitive to area-type defects such as cracks and incomplete fusion, which are very harmful. It is easy to miss detection, which brings great hidden dangers to the safe operation of nuclear power facilities; the accessibility of conventional ultrasonic detection is poor, and the accuracy of detection results is easily affected by coupling conditions and the level of technical personnel, making it difficult to perform fast and accurate detection

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