Online repairing method for main screw holes of reactor pressure vessel flanges

A pressure vessel and repair method technology, which is applied in the field of on-line repair of the main screw hole of the reactor pressure vessel flange, can solve the problems of restricting the critical path of refueling overhaul, damage to the main bolt or screw hole thread, and seizure, so as to achieve optimal online repair Effect of selection and prevention of overgrinding

Active Publication Date: 2018-05-08
SANMEN NUCLEAR POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the experience feedback of many main bolts or screw hole thread damage at home and abroad, any small thread defect may cause the main bolt to jam or even bite when the main bolt is implanted or unscrewed, which may cause serious damage to the main bolt or screw hole thread , and lead to the scrapping of the main bolt, drilling or reaming of the main screw hole, and re-tapping, which seriously restricts the critical path of refueling and overhaul, and has a serious impact on the safe and reliable operation of nuclear power plants

Method used

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  • Online repairing method for main screw holes of reactor pressure vessel flanges
  • Online repairing method for main screw holes of reactor pressure vessel flanges
  • Online repairing method for main screw holes of reactor pressure vessel flanges

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Embodiment Construction

[0049] The invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0050] as attached figure 1 , 2 As shown in and 3, a reactor pressure vessel flange main screw hole online grinding and repairing device provided by the present invention, the device includes a grinding thread mold 4, a rotating operating handle 5 (composed of a connecting pipe 12 and an operating handle 13) , Swivel device 6, spring balancer 7, lock nut 9, positioning plug 10 and positioning screw 11.

[0051] Among them, the external thread of the paired thread tire 4 refers to the thread specification of the main bolt, and the middle diameter is processed according to the standard thread diameter of the main bolt by 0.01 mm. The material is 45# steel and has been quenched, tempered and hardened. The hardness requirement of the tool 4 thread should not be lower than the thread of the main screw hole 1; the thickness of the research thread mold 4 ...

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Abstract

The invention relates to an online repairing method for screw holes and threads, in particular to the online repairing method for the main screw hole of reactor pressure vessel flanges. The repairingmethod comprises the following steps of 1, defects of the main screw holes and the threads are inspected and repair preparation is carried out; 2, manually repairing is carried out by a scraper; 3, manual slight grinding is carried out by a metallographic abrasive paper; 4, screw tap repairing method is adopted; and 5, online grinding and repairing are adopted. According to the online repairing method, common defects of the main screw holes and the threads are covered, so that fine, efficient and reliable online repairing is realized.

Description

technical field [0001] The invention relates to an online repair method for screw holes and threads, in particular to an online repair method for the main screw holes of reactor pressure vessel flanges. The process can effectively complete the on-line repair of various forms and serious thread damages or defects of the main screw hole of the reactor through a variety of thread repair processes or combined processes. Background technique [0002] The cooperation between the main bolts and the thread of the screw hole of the reactor pressure vessel flange of the pressurized water reactor nuclear power plant is very precise, and the condition of the thread of the main screw hole is very critical. According to the experience feedback of many main bolts or screw hole thread damage at home and abroad, any small thread defect may cause the main bolt to jam or even bite when the main bolt is implanted or unscrewed, which may cause serious damage to the main bolt or screw hole thread...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P6/00
CPCB23P6/00
Inventor 范福平李涛何行洲郭科科申亚波郑强畏王培源叶荣山
Owner SANMEN NUCLEAR POWER CO LTD
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