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Repairing technique for sealing surface of valve plate of nuclear-grade gate valve

A technology of sealing surface and nuclear grade gate, which is applied in the field of repairing technology of the sealing surface of the valve plate of nuclear grade gate valve, and can solve the problems of primary pressure boundary damage of the primary circuit and the like.

Active Publication Date: 2019-07-02
CNNC NUCLEAR POWER OPERATION MANAGEMENT +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] After the overhaul of Qinshan 300,000 units OT115 and OT116, various degrees of internal leakage occurred in the isolation valve V08-01A in the hot section of the I ring to the inlet pipe of the stop cooling, resulting in damage to the primary pressure boundary of the primary circuit

Method used

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  • Repairing technique for sealing surface of valve plate of nuclear-grade gate valve
  • Repairing technique for sealing surface of valve plate of nuclear-grade gate valve
  • Repairing technique for sealing surface of valve plate of nuclear-grade gate valve

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0042] A process for repairing the sealing surface of a nuclear-grade gate valve plate, which specifically includes the following steps:

[0043] 1.1. There is a defect in the sealing surface of the valve plate 2 of the valve body 3 of the highly radioactive nuclear-grade gate valve.

[0044] 1.2. Collect information such as the structure of the valve to be repaired, the valve plate body and the material of the sealing surface.

[0045] 1.3. Combining with the material of the valve plate body and sealing surface, write the welding process qualification and heat treatment process and pass the review.

[0046] 1.4. Prepare corresponding welding consumables and simulation bodies in combination with welding procedure qualification.

[0047]1.5. Carry out simulation verification on the simulation body according to the welding procedure qualification and he...

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Abstract

The invention belongs to the technical field of maintenance of internal components of a pressurized water reactor, and particularly relates to a repairing technique for a sealing surface of a valve plate of a nuclear-grade gate valve. The repairing technique for the sealing surface of the valve plate of the nuclear-grade gate valve is designed for repairing a valve plate which is not usable causedby grinding, corrosion, cracks and the like. According to the repairing technique, the angle of the valve plate after second turning can be basically consistent with the angle of the original valve plate, close-distance contact between the to-be-repaired valve plate and personnel can be effectively controlled, the irradiation dose of the personnel is reduced, the angle of the valve plate can alsobe subjected to double verification through a valve plate angle measurement color printing test, and the heat treatment is carried out on the site through a heat treatment electric heating furnace, so that the heat treatment is achieved and the irradiation dose to the personnel is effectively controlled.

Description

technical field [0001] The invention belongs to the technical field of repairing internal components of a pressurized water reactor, and in particular relates to a repairing process for a valve plate sealing surface of a nuclear-level gate valve. Background technique [0002] After the overhaul of Qinshan 300,000 units OT115 and OT116, various degrees of internal leakage occurred in the isolation valve V08-01A in the hot section of the I ring to the front cooling inlet pipe, resulting in damage to the primary pressure boundary of the primary circuit. After historical inspection and maintenance investigation, it was found that the effective sealing surface of the valve plate was very thin due to the “dead pipe” effect of the valve. Therefore, the maintenance department proposed a repair process for the sealing surface of the nuclear gate valve valve plate. The repair process of the valve plate of the first-grade gate valve is roughly as follows: [0003] 1. Collect relevant ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P6/00
CPCB23P6/00
Inventor 邵震程晓文邹远波陈梁施靖峰万国强
Owner CNNC NUCLEAR POWER OPERATION MANAGEMENT
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