CN208507205U - A kind of heavy water reactor main pipeline branch pipe connection connection structure for alleviating stress corrosion cracking - Google Patents
A kind of heavy water reactor main pipeline branch pipe connection connection structure for alleviating stress corrosion cracking Download PDFInfo
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- CN208507205U CN208507205U CN201820973845.2U CN201820973845U CN208507205U CN 208507205 U CN208507205 U CN 208507205U CN 201820973845 U CN201820973845 U CN 201820973845U CN 208507205 U CN208507205 U CN 208507205U
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- main pipeline
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The utility model belongs to nuclear power design and running technology field, and in particular to a kind of heavy water reactor main pipeline branch pipe connection connection structure for alleviating stress corrosion cracking.It is designed to provide a kind of heavy water reactor main pipeline branch pipe connection connection structure, alleviates stress corrosion cracking, simplifies site examining and repairing process, guarantees welding quality, keeps main pipeline branch pipe connection complete reliable within the phase in longevity.The utility model includes main pipeline, tube socket, adapter and gauge pipe, further includes transitional pipe segment；The upper end of tube socket is connected to the lower end of the opening of main pipeline connecting branch, passes through argon arc welding welding between tube socket and main pipeline；The upper end of transitional pipe segment is connected to the lower end of tube socket, passes through argon arc welding welding between transitional pipe segment and tube socket；The upper end of adapter is connected to the lower end of transitional pipe segment, passes through argon arc welding welding between adapter and transitional pipe segment；The upper end of gauge pipe is connected to the lower end of adapter, passes through all-position automatic welding technology between gauge pipe and adapter.
Description
Technical field
The utility model belongs to nuclear power design and running technology field, and in particular to a kind of weight for alleviating stress corrosion cracking
Water-water reactor main pipeline branch pipe connection connection structure.
Background technique
The main pipeline of heavy water reactor is the pressure boundary of heavy water reactor primary Ioops high temperature and pressure coolant, is main nuclear safety screen
Barrier, integrality directly affect heavy water reactor nuclear safety.Main pipeline branch pipe connection will lead to heavy water reactor one in case of double
Circuit loses coolant, will introduce core meltdown risk, seriously affects unit safety stable operation.Main pipeline branch pipe connection position
See attached drawing 1.
In December, 2007 and in October, 2016, No. 1 unit of Qinshan third nuclear power plant is just as main pipeline branch pipe connection cracks
It causes primary Ioops heavy water to leak and leads to 2 unplanned shutdown light maintenances, the corresponding economic loss of the generated energy only lost respectively
I.e. more than 80,000,000 yuans.
The connection structure of heavy water reactor main pipeline branch pipe connection original design is as shown in attached drawing 2.Each component is respectively in figure
1 --- --- tube socket, 3 --- adapter, 4 --- gauge pipe of main pipeline, 2.
For heavy water reactor main pipeline branch pipe connection leakage problem, center nuclear power operational management Co., Ltd sets up ten big technologies
Problem special project group mainly completes following analysis, assessment and development.
Complete the main pipeline branch pipe connection defective FRU of in December, 2007 and 2 generation cracking leakages October in 2016
Failure cause analysis specifies different-metal material welding connector of the pipe fitting Cracks between carbon steel tube socket and stainless steel adapter
Stress corrosion cracking by the different side of stainless steel, crackle originate from inner wall of the pipe many places, and a plurality of crackle cracks in parallel to be run through.
It, clearly cannot be by directly opening primary life based on failure analysis conclusion, and the characteristics of combination stress corrosion cracking
Split leakage welding point carry out repair by welding mode complete defect processing, and adapter must be carried out replacement or by
Branch pipe connection outer surface carries out built-up welding, the form of increase soldering sleeve is repaired.
According to stress corrosion cracking failure mechanism, the major influence factors for clearly causing branch pipe connection to crack are welding
Stress, base material and the wlding of joint, welding quality etc..
Lead to the principal element of main pipeline branch pipe connection stress corrosion cracking from alleviating, by welding procedure test,
Stress corrosion under the conditions of the test of welding point conventional mechanical property, argon atmosphere Mechanics Performance Testing, simulation primary Ioops water is quick
Perception test etc. devises a kind of heavy water reactor main pipeline branch pipe for alleviating stress corrosion cracking in conjunction with site examining and repairing process conditions
Joint connecting structure optimizes the stress distribution of different-metal material welding joint, and preferably Sensitivity of Stress Corrosion is relatively low
Wlding, increase carbon steel transitional pipe segment, realize shop-fabricated different-metal material welding, ensure that welding quality.
Utility model content
The purpose of this utility model is to provide a kind of heavy water reactor main pipeline branch pipe connection connection structures, alleviate stress corrosion
Cracking simplifies site examining and repairing process, guarantees welding quality, keeps main pipeline branch pipe connection complete reliable within the phase in longevity.
The utility model is realized in this way:
A kind of heavy water reactor main pipeline branch pipe connection connection structure for alleviating stress corrosion cracking, including it is main pipeline, tube socket, suitable
Orchestration and gauge pipe further include transitional pipe segment；The upper end of tube socket is connected to the lower end of the opening of main pipeline connecting branch, tube socket
Pass through argon arc welding welding between main pipeline；The upper end of transitional pipe segment is connected to the lower end of tube socket, between transitional pipe segment and tube socket
Pass through argon arc welding welding；The upper end of adapter is connected to the lower end of transitional pipe segment, passes through argon arc between adapter and transitional pipe segment
Weldering welding；The upper end of gauge pipe is connected to the lower end of adapter, passes through all-position automatic welding technology between gauge pipe and adapter.
Main pipeline caliber as described above is 20 inches；The caliber of tube socket is 20 inches and turns 3/4 inch；The pipe of adapter
Diameter is 3/4 inch and turns 3/8 inch；The caliber of gauge pipe is 3/8 inch；The caliber of transitional pipe segment is 3/4 inch, and length is
60mm, wall thickness 3.91mm；Welding section between transitional pipe segment and tube socket, between adapter and transitional pipe segment respectively opens 35 degree of slopes
Mouthful, root face 1mm.
Main pipeline as described above is made of low-carbon steel material；Tube socket is made of low-carbon steel material；Adapter uses
Stainless steel material is made；Gauge pipe is made of stainless steel；Transitional pipe segment is made of low-carbon steel material.
The beneficial effects of the utility model are:
The original connection structure material of heavy water reactor main pipeline branch pipe connection has given Qinshan there are certain Sensitivity of Stress Corrosion
Third nuclear power plant brings huge economic losses.
Using a kind of heavy water reactor main pipeline branch pipe connection connection structure of alleviation stress corrosion cracking of the utility model, energy
Stress distribution of enough effectively optimization heavy water reactor main pipeline branch pipe connections at dissimilar metal welding line of the mild steel to stainless steel, is selected
The relatively former design welding material anticorrosion stress-resistant sensitive capability of wlding it is strong, it is rotten to significantly improve main pipeline branch pipe connection proof stress
Erosion ability keeps it complete reliable within the phase in longevity.
The different-metal material welding connector that increased carbon steel transitional pipe segment can be difficult to be welded is transferred to workshop welding.Workshop
Welding can be realized downhand position, and welding surroundings are comfortable, and welder is not required to wear the Tritium Protections articles such as frog-suit, and welding quality can obtain
Guarantee to the limit.
The transitional pipe segment for increasing specific length, which can be avoided, occurs liquid vibration harmony at heavy water reactor main pipeline branch pipe connection
Vibration.
Detailed description of the invention
Fig. 1 is the branch pipe connection position view on main pipeline；
Fig. 2 is existing main pipeline branch pipe connection attachment structure schematic diagram；
Fig. 3 is the main pipeline joint form and its attachment structure schematic diagram of the utility model.
Wherein: 1. main pipelines, 2. tube sockets, 3. adapters, 4. gauge pipes, 5. transitional pipe segments.
Specific embodiment
The utility model is described further with reference to the accompanying drawings and examples.
As shown in figure 3, a kind of heavy water reactor main pipeline branch pipe connection connection structure for alleviating stress corrosion cracking, including supervisor
Road 1, tube socket 2, adapter 3, gauge pipe 4 and transitional pipe segment 5.The upper end of tube socket 2 is connected to the opening of 1 connecting branch of main pipeline
Lower end, pass through argon arc welding welding between tube socket 2 and main pipeline 1.The upper end of transitional pipe segment 5 is connected to the lower end of tube socket 2, transition
Pass through argon arc welding welding between pipeline section 5 and tube socket 2.The upper end of adapter 3 is connected to the lower end of transitional pipe segment 5, adapter 3 and mistake
It crosses between pipeline section 5 and passes through argon arc welding welding.The upper end of gauge pipe 4 is connected to the lower end of adapter 3, gauge pipe 4 and adapter 3 it
Between pass through all-position automatic welding technology.
In the present embodiment, 1 caliber of main pipeline is 20 inches, is made of low-carbon steel material.The caliber of tube socket 2 is 20
Inch turns 3/4 inch, is made of low-carbon steel material.The caliber of adapter 3 is 3/4 inch and turns 3/8 inch, using stainless steel
Material is made.The caliber of gauge pipe 4 is 3/8 inch, is made of stainless steel.The caliber of transitional pipe segment 5 is 3/4 inch, long
Degree is 60mm, and wall thickness 3.91mm is made of low-carbon steel material.Between transitional pipe segment 5 and tube socket 2, adapter 3 and coupling tube
Welding section between section 5 respectively opens 35 degree of grooves, root face 1mm, so that being easy through welding in welding.
The implementation steps of live branch pipe connection replacement are as follows:
1. completing the different-metal material welding between adapter 3 and gauge pipe 4 in workshop first when replacing welding point.
Implement the liquid penetrant inspection of groove and interlayer to the weld seam.
2. the face of weld between pair adapter 3 and gauge pipe 4 carries out sanding and polishing, require to go exterior surface after polishing
Reinforcement, smooth surface are visible by naked eyes pit.
3. the welded seam area between pair adapter 3 and gauge pipe 4 implements liquid penetrant inspection, outer surface does not allow any line
Property show and round display of the diameter greater than 0.5mm, otherwise need to carry out sectional repair.
4. welded seam area between pair adapter 3 and gauge pipe 4 implements radiological survey X, do not allow any incomplete fusion defect,
Crackle class is shown and round display of the diameter greater than 1mm.
5. the welded seam area between pair adapter 3 and gauge pipe 4 implements ultrasonic phase array inspection, ultrasonic phase array inspection is
The follow-up investigations of auxiliary are recorded not as the judging basis of weld seam, but to the display for being more than 0.4mm.
6. the excessive defect that the welded seam area between pair adapter 3 and gauge pipe 4 is found, need to reprocess elimination.
7. the different-metal material welding between adapter 3 and gauge pipe 4 is completed after the assay was approved in workshop, 3 He of adapter is completed
The butt welding of transitional pipe segment 5, butt welding need to implement liquid infiltration to the weld seam using the all-position automatic welding technology that filling metal is not added
It checks thoroughly and radiological survey X, the acceptance criteria of inspection is executed according to pipeline-weld design-build standard.
8. the butt welding of field conduct tube socket 2 and transitional pipe segment 5 need to implement groove to the weld seam and final liquid seeps
Inspection and radiological survey X thoroughly.The acceptance criteria of inspection is executed according to pipeline-weld design-build standard.
9. the mechanical cutting ferrule connection that gauge pipe is completed at scene.
It is explained in detail above in conjunction with implementation method of the embodiment to the utility model, but the utility model and unlimited
In above-described embodiment, within the knowledge of a person skilled in the art, the utility model can also not departed from
Various changes can be made under the premise of objective.The content being not described in detail in the utility model specification can use existing skill
Art.
Claims (3)
1. a kind of heavy water reactor main pipeline branch pipe connection connection structure for alleviating stress corrosion cracking, including main pipeline (1), tube socket
(2), adapter (3) and gauge pipe (4), it is characterised in that: it further includes transitional pipe segment (5)；The upper end of tube socket (2) is connected to master
The lower end of the opening of pipeline (1) connecting branch, passes through argon arc welding welding between tube socket (2) and main pipeline (1)；Transitional pipe segment
(5) upper end is connected to the lower end of tube socket (2), passes through argon arc welding welding between transitional pipe segment (5) and tube socket (2)；Adapter (3)
Upper end be connected to the lower ends of transitional pipe segment (5), pass through argon arc welding welding between adapter (3) and transitional pipe segment (5)；Gauge pipe
(4) upper end is connected to the lower end of adapter (3), passes through all-position automatic welding technology between gauge pipe (4) and adapter (3).
2. the heavy water reactor main pipeline branch pipe connection connection structure according to claim 1 for alleviating stress corrosion cracking, special
Sign is: main pipeline (1) caliber is 20 inches；The caliber of tube socket (2) is 20 inches and turns 3/4 inch；Adapter (3)
Caliber is 3/4 inch and turns 3/8 inch；The caliber of gauge pipe (4) is 3/8 inch；The caliber of transitional pipe segment (5) is 3/4 inch, long
Degree is 60mm, wall thickness 3.91mm；Weldering between transitional pipe segment (5) and tube socket (2), between adapter (3) and transitional pipe segment (5)
It connects section and respectively opens 35 degree of grooves, root face 1mm.
3. the heavy water reactor main pipeline branch pipe connection connection structure according to claim 1 for alleviating stress corrosion cracking, special
Sign is: the main pipeline (1) is made of low-carbon steel material；Tube socket (2) is made of low-carbon steel material；Adapter (3)
It is made of stainless steel；Gauge pipe (4) is made of stainless steel；Transitional pipe segment (5) is made of low-carbon steel material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820973845.2U CN208507205U (en) | 2018-06-22 | 2018-06-22 | A kind of heavy water reactor main pipeline branch pipe connection connection structure for alleviating stress corrosion cracking |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820973845.2U CN208507205U (en) | 2018-06-22 | 2018-06-22 | A kind of heavy water reactor main pipeline branch pipe connection connection structure for alleviating stress corrosion cracking |
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| CN208507205U true CN208507205U (en) | 2019-02-15 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108597623A (en) * | 2018-06-22 | 2018-09-28 | 中核核电运行管理有限公司 | A kind of heavy water reactor main pipeline branch pipe connection connection structure for alleviating stress corrosion cracking |
| CN112045364A (en) * | 2020-08-25 | 2020-12-08 | 上海核工程研究设计院有限公司 | Method for repairing J-shaped welding seam of pressure boundary of nuclear-grade small-diameter penetration piece |
| CN114378467A (en) * | 2021-12-13 | 2022-04-22 | 海洋石油工程（青岛）有限公司 | Welding scheme of two welding openings of branch pipe connecting branch pipe of branch pipe table |
-
2018
- 2018-06-22 CN CN201820973845.2U patent/CN208507205U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108597623A (en) * | 2018-06-22 | 2018-09-28 | 中核核电运行管理有限公司 | A kind of heavy water reactor main pipeline branch pipe connection connection structure for alleviating stress corrosion cracking |
| CN108597623B (en) * | 2018-06-22 | 2024-05-14 | 中核核电运行管理有限公司 | Stress corrosion cracking relieving main pipeline branch pipe joint connecting structure of heavy water reactor |
| CN112045364A (en) * | 2020-08-25 | 2020-12-08 | 上海核工程研究设计院有限公司 | Method for repairing J-shaped welding seam of pressure boundary of nuclear-grade small-diameter penetration piece |
| CN114378467A (en) * | 2021-12-13 | 2022-04-22 | 海洋石油工程（青岛）有限公司 | Welding scheme of two welding openings of branch pipe connecting branch pipe of branch pipe table |
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