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Main screw hole damage repairing method for nuclear power plant reactor pressure vessel

A pressure vessel and damage repair technology, which is applied in the field of damage repair of the main screw hole of the reactor pressure vessel of the nuclear power plant, can solve the problems such as the weakening of the flange structure rigidity of the RPV vessel and the large size of the main screw hole expansion, and achieve the application prospect and Huge economic benefits and the effect of repairing serious damage

Active Publication Date: 2019-09-20
中广核工程有限公司 +2
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AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a method for repairing the damage of the main screw hole of RPV, so as to solve the problem that the rigidity of the flange structure of the RPV container is weakened due to the excessively large size of the main screw hole, and effectively ensure the safe operation of the nuclear power plant

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  • Main screw hole damage repairing method for nuclear power plant reactor pressure vessel
  • Main screw hole damage repairing method for nuclear power plant reactor pressure vessel
  • Main screw hole damage repairing method for nuclear power plant reactor pressure vessel

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Embodiment Construction

[0031] In order to make the purpose, technical solution and beneficial technical effects of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific implementations described in this specification are only for explaining the present invention, not for limiting the present invention.

[0032] Automatic pulse tungsten inert gas shielded welding (GTAW) is one of the methods with better welding quality in gas shielded arc welding in the world. During welding, the welding wire is fed by the wire feeding mechanism, and the welding torch automatically moves according to the set trajectory for welding. The shielding gas (argon, helium, etc.) is sprayed continuously from the nozzle of the welding torch, forming a gas shield around the molten pool to isolate the air. Compared with manual metal arc welding (SMAW) commonly used in nuclear ...

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Abstract

The invention discloses a main screw hole damage repairing method for a nuclear power plant reactor pressure vessel (RPV). The method comprises the follow steps of 1), carrying out hole expansion treatment on the damaged RPV main screw hole to remove the original thread and the damage defect; 2), adopting automatic pulse tungsten inert gas shielded welding to continuously implement horizontal welding position multi-bead multi-layer welding from bottom to top along the inner wall at the bottom of an RPV main screw hole; and 3), mechanical machining is carried out on the weld metal on the inner wall of the main screw hole, redundant weld metal is completely removed, and after removal is completed, carrying out new thread machining on the weld metal on the inner wall of the main screw hole to obtain a main screw hole meeting the design size requirement. According to the method, the new thread is prepared through welding and machining, so that the severe damage of the main screw hole thread of the RPV can be effectively repaired, and the application prospect and the economic benefit are huge.

Description

technical field [0001] The invention belongs to the field of damage repairing of main screw holes of reactor pressure vessels of nuclear power plants, and more specifically, the invention relates to a method for repairing damage of main screw holes of reactor pressure vessels of nuclear power plants. Background technique [0002] The reactor pressure vessel (Reactor Pressure Vessel, abbreviated as RPV) is the non-replaceable core equipment of the nuclear power plant, and its working life determines the operating life of the nuclear power plant. The RPV fastening assembly is used to connect the RPV container body and the top cover, and is an important part for ensuring the sealing of the RPV and preventing the leakage of coolant. The RPV fastening assembly includes a top cover flange 12 and a container flange 13. The container flange 13 is provided with a main screw hole, and the main bolt 11 is connected to the main screw thread 14 in the main screw hole by passing through t...

Claims

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Application Information

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IPC IPC(8): B23P6/00
CPCB23P6/00
Inventor 金亮邱振生钟振堂黄腾飞胡大芬匡艳军孙广刘彦章王莉冉小兵段远刚
Owner 中广核工程有限公司
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