Automatic penetrant inspection device for weld of high-level radioactive valve in nuclear power plant

Abstract

The invention discloses an automatic penetrant inspection device for a weld of a high-level radioactive valve in a nuclear power plant. The automatic penetrant inspection device comprises a main guiderail, a main drive assembly fixed to the lower end portion of the main guide rail, a gear case connected with the main drive assembly and fixedly connected with the lower end portion of the main guide rail, an outer sleeve having one end fixedly connected with the output shaft of the gear box, an inner connection pipe having one end arranged in and slidingly passing through the outer sleeve, a telescopic cylinder fixed on the outer sleeve, a penetrant inspection assembly detachably connected with the other end of the inner connection pipe and a piston rod of a telescopic cylinder, a video inspection assembly and a control portion, wherein the axis of the output shaft is arranged to perpendicular to the main guide rail, and the telescopic direction of the piston rod is parallel to the sliding direction of the inner connection pipe. According to the invention, the main guide rail and the main drive assembly are utilized to convey the penetrant inspection assembly and the video inspection assembly into a valve for penetrant and video inspection of the circumferential weld of the valve, so workload is substantially reduced, the dose rate of radiation received by personnel is low, andinspection cost is low.

Description

technical field [0001] The invention belongs to the field of non-destructive testing equipment, in particular to an automatic penetration inspection device for welding seams of high-level radioactive valves in nuclear power plants. Background technique [0002] According to relevant experience feedback, the sealing surfaces of nuclear primary valves in RCP, RRA, RIS and other systems have failed and need to be repaired. The conventional repair process is to replace the valve as a whole, but the workload is heavy, the dose rate received by personnel is high, and the cost is high. On-line repair technologies such as automatic overlay welding repair of the seat sealing surface or seat ring replacement can completely deal with the defects of the sealing surface without replacing the whole valve, reducing the welding workload and avoiding the replacement of spare parts as a whole, which is extremely economical Advantage. [0003] Before welding, according to the requirements ...

AI Technical Summary

Problems solved by technology

For the replacement of guide rails and seat rings of DN250 and DN350 gate valves, and the replacement of seat rings of DN150, DN250 and DN300 check valves, due to the small internal space and inaccessibility of personnel, it is impossible to carry out penetration inspections, so it is necessary to develop a nuclear power plant Automatic penetration testing technology and equipment for high-level valve weld seams, and perform penetration testing on the above parts

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