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Damage repair method for main screw hole of reactor pressure vessel in nuclear power plant

A pressure vessel and damage repair technology, which is applied in the field of damage repair of main screw holes of reactor pressure vessels in nuclear power plants, can solve the problems of weakened rigidity of the flange structure of RPV vessels and excessively large size of main screw holes, and achieves application prospects and Huge economic benefits, the effect of repairing severe damage

Active Publication Date: 2022-03-15
中广核工程有限公司 +2
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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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  • Damage repair method for main screw hole of reactor pressure vessel in nuclear power plant
  • Damage repair method for main screw hole of reactor pressure vessel in nuclear power plant
  • Damage repair method for main screw hole of reactor pressure vessel in nuclear power plant

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[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 damage repair method for a main screw hole of a nuclear power plant reactor pressure vessel (referred to as RPV), which comprises the following steps: 1) reaming the damaged RPV main screw hole to remove the original thread and damage defects; 2) Automatic pulse tungsten inert gas shielded welding is used to continuously implement horizontal welding position multi-pass multi-layer welding at the bottom of the RPV main screw hole along the inner wall from bottom to top; 3) Machining the weld metal on the inner wall of the main screw hole The weld metal of the main screw hole is completely removed. After the removal is completed, a new thread processing is performed on the weld metal on the inner wall of the main screw hole to obtain a main screw hole that meets the design size requirements. The invention prepares new threads by welding and machining, can effectively repair serious damage to the threads of RPV main screw holes, and has huge application prospects and economic benefits.

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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Patent Type & Authority Patents(China)
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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