Method and device for in-service inspection of nuclear power plant containment mechanical penetrations and welds thereof

Abstract

The invention relates to a containment mechanical penetrating piece of a nuclear power station, and an in-service inspection method and device for a welding seam of the containment mechanical penetrating piece of the nuclear power station, and is used for performing the in-service inspection on the welding seam between a pipeline in which a high-energy medium flows and a sealing head in the containment mechanical penetrating piece of the nuclear power station. The in-service inspection method of the welding seam comprises the steps: (S1) arranging a protective sleeve outside the pipeline in a to-be-inspected containment mechanical penetrating piece in a sheathing manner and arranging the protective sleeve to be close to an anchoring sleeve in the containment mechanical penetrating piece, so as to form containing space for the in-service inspection device for the welding seam to operate between the protective sleeve and the pipeline; (S2) installing the in-service inspection device for the welding seam in the containing space, wherein a radiation source assembly and a film are arranged on the in-service inspection device for the welding seam, and pushing the device to a position on which the to-be-inspected welding seam is positioned; (S3) controlling a control unit of the in-service inspection device for the welding seam, so as to start a lifting assembly, so that the film is clung to a to-be-inspected welding seam; and (S4) controlling the radiation source assembly to start the irradiation, then starting the lifting assembly again after the irradiation, so that the film is reset to the initial position, and taking out the in-service inspection device for the welding seam, so as to obtain an inspection result.

Description

technical field [0001] The invention relates to an electromechanical device of a nuclear power plant, and more specifically relates to a method and device for in-service inspection of a containment shell mechanical penetrating part of a nuclear power plant and its weld seam. Background technique [0002] The containment mechanical penetrations in nuclear power plants have the function of radiation shielding, such as figure 1 As shown, the containment mechanical penetration includes a pipeline 1 for the flow of high-energy medium, a protective sleeve 2 sleeved outside the pipeline 1, an anchor sleeve 3 sleeved outside the protective sleeve 2, and the pipeline 1 and the anchor sleeve respectively. The cylinder 3 is fixedly connected to the head 4 . [0003] In the prior art, both the pipe 1 and the anchor sleeve 3 are fixedly connected to the head 4 by welding. The weld between the head 4 and the pipeline 1 is located inside the anchor sleeve 3. Since the existing protective...

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Problems solved by technology

[0006] In order to solve the problem that the in-service inspection of the weld between the head and the pipeline cannot be carried out in the prior art, the present invention provides a nuclear power plant containment machine capable of reliable and convenient in-service inspection of the weld to be tested Method and device for in-service inspection of penetrations and their welds

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