Ultrasonic detection device for circumferential weld of bottom head of reactor pressure vessel

Abstract

The invention provides an ultrasonic detection device for a circumferential weld of a bottom head of a reactor pressure vessel. The device comprises a rack, an oscillating gear and an oscillating rod which are connected by a rotary shaft, wherein the oscillating gear and the oscillating rod are connected by a thread; a driving element drives the oscillating gear to oscillate so as to enable the oscillating rod to oscillate around the rotary shaft; a linear guide rail and a retractable air cylinder are fixedly arranged above the oscillating rod; a slide block is arranged on the linear guide rail and a stretching-out rod is fixedly arranged on the slide block; one end of the stretching-out rod is connected with the retractable air cylinder and the other end of the stretching-out rod is connected with a tray; the stretching-out rod is retracted under the effect of the retractable air cylinder so as to drive the tray to be stretched out and taken back. According to the device, the accuracy and the reliability of detection data can be improved and the irradiation to a human body by radioactive rays is reduced.

Description

technical field [0001] The invention belongs to the non-destructive testing application of the bottom head girth weld of the nuclear reactor pressure vessel of a nuclear power plant, and in particular relates to an ultrasonic inspection device for the bottom head girth weld of the nuclear reactor pressure vessel. Background technique [0002] Nuclear power plant pressure vessel is one of the core components of nuclear reactor coolant pressure boundary. The head girth weld refers to the connection weld between the shell section and the bottom head. The girth weld of the bottom head is one of the main objects of the non-destructive testing of the primary circuit system. Since the metal is prone to defects such as air bubbles, cracks, and slag inclusions after welding, defective welds are prone to corrosion at the defect. The gradual expansion of corrosion will cause the leakage of radioactive coolant in the primary circuit, which will cause serious safety accidents. Therefore...

AI Technical Summary

Problems solved by technology

The girth weld of the bottom head is one of the main objects of the non-destructive testing of the primary circuit system. Since defects such as air bubbles, cracks, and slag inclusions are prone to occur after metal welding, defective welds are prone to corrosion at the defect

The gradual expansion of corrosion will cause the leakage of radioactive coolant in the primary circuit, and serious safety accidents will occur. Therefore, non-destructive testing of this type of weld must be carried out regularly

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