CN108538410A - A kind of nuclear fuel assembly guide pipe - Google Patents
A kind of nuclear fuel assembly guide pipe Download PDFInfo
- Publication number
- CN108538410A CN108538410A CN201810443637.6A CN201810443637A CN108538410A CN 108538410 A CN108538410 A CN 108538410A CN 201810443637 A CN201810443637 A CN 201810443637A CN 108538410 A CN108538410 A CN 108538410A
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- China
- Prior art keywords
- guide pipe
- fuel assembly
- outer tube
- inner tube
- tube
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C7/00—Control of nuclear reaction
- G21C7/06—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section
- G21C7/08—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section by displacement of solid control elements, e.g. control rods
- G21C7/20—Disposition of shock-absorbing devices ; Braking arrangements
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C7/00—Control of nuclear reaction
- G21C7/06—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section
- G21C7/08—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section by displacement of solid control elements, e.g. control rods
-
- 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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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The invention discloses a kind of nuclear fuel assembly guide pipes, including the open outer tube in both ends and for the end plug of sealed outer pipe lower ending opening, it is fixed at least one inner tube in the inner peripheral wall of the outer tube, and the outer tube lower end surface is flushed with the lower end surface of inner tube.It is high for location fit difficulty after the complicated of guide pipe in the prior art, expanded joint, and the expanded joint part of guide pipe is easy failure, and then the skeleton of entire fuel assembly is caused to fail, in this regard, the guide pipe design method of applicant's abandoning tradition, using outer tube and inner tube double layer design, and it is connect with end plug after flushing the lower face of said inner tube with the lower face of outer tube, to meet the buffering effect of fuel assembly requirement, it is ensured that guide pipe has enough rigidity, and then improves its anti-seismic performance.
Description
Technical field
The present invention relates to fuel assembly for nuclear reactor technical fields, and in particular to a kind of nuclear fuel assembly guide pipe.
Background technology
Nuclear fuel assembly is made of several fuel rods, guiding duct member, grid spacer and upper bottom nozzle etc..It is oriented to duct member
It is the supporting part of fuel assembly skeleton, basic function is as follows：Continuity is provided for fuel assembly structure；For fuel relevant group
Part, which provides, is inserted into channel；For reactor emergency shut-down when control rod whereabouts provide waterpower buffering；It is provided for fuel associated assembly stick
Coolant flow.
Currently, PWR fuel assembly typical case's guide pipe structure mainly has AFA3G guide pipes and AP1000 guide pipes).
AFA3G guide pipes are MonoblocTM guide pipes, use the design of breeze way wall thickness increasing, are oriented to pipe outside diameter and remain unchanged,
Upper inner diameter is larger, and lower buffer section internal diameter is smaller.MonoblocTM guide pipes are simple in structure, but guide pipe rolling mill practice difficulty
Larger, the country not yet grasps this technique at present；AP1000 guide pipes are tube-in-tube structure, and separator tube is placed in the lower end of guide pipe,
The two is matched by respective end plug, but although AP1000 guide pipes avoid the larger rolling of AFA3G guide pipe difficulty
Technique, but separator tube and end plug are increased, structure is more complex, and location fit difficulty is larger.In addition, AP1000 guide pipes need elder generation
With bottom grillage casing expanded joint, it is inserted into internal damping pipe and carries out expanded joint formation guiding duct member, exist because being oriented to duct member
Expanded joint failure causes the risk of entire fuel assembly skeleton failure, expanding joint process difficulty larger.
Invention content
Present invention aims at a kind of nuclear fuel assembly guide pipe is provided, while reducing the requirement of guide pipe manufacturing process,
Improve the antidetonation nargin of guide pipe.
The present invention is achieved through the following technical solutions：
A kind of nuclear fuel assembly guide pipe, including the open outer tube in both ends and for sealed outer pipe lower ending opening
End plug is fixed at least one inner tube, and the lower end end of the outer tube lower end surface and inner tube in the inner peripheral wall of the outer tube
Face flushes.It is high for location fit difficulty after the complicated of guide pipe in the prior art, expanded joint, and the expanded joint portion of guide pipe
Partial volume is vulnerable, and then the skeleton of entire fuel assembly is caused to fail, in this regard, the guide pipe design side of applicant's abandoning tradition
Formula using outer tube and inner tube double layer design, and is connect after the lower face of said inner tube is flushed with the lower face of outer tube with end plug,
To meet the buffering effect of fuel assembly requirement, it is ensured that guide pipe has enough rigidity, and then improves its anti-seismic performance；Into one
Step ground under design basis accident (i.e. under the synergy of coolant loss of-coolant accident (LOCA) LOCA and safe shutdown earthquake SSE), is oriented to
The stress of pipe must satisfy limiting design value, i.e. a film adds bending stress limit value to be 231MPa (1.5 times of base allowable stress intensities),
And (patent CN 102750992A) discloses a kind of compound direction pipe for nuclear fuel assembly in the prior art, by guide pipe,
Inner sleeve and guide pipe end plug are constituted, and there are certain between the lower part of guide pipe, inner sleeve and guide pipe end plug for inner sleeve expanded joint
Spacing, the compound direction pipe is simple in structure, save structural material, and reactor current heap-type design need to consider certain packet
Network, the limiting safe earthquake motion of nuclear power station use ground acceleration 0.3g and are used as input, therefore design basis accident operating mode
The design of lower fuel assembly guide pipe needs the requirement for meeting 0.3g earthquakes, but its in existing disclosed guide pipe is oriented to pipe end
Side is hanging section beyond the Great Wall, causes the rigidity of guide pipe lower part to decrease compared with AFA3G guide pipes, under design basis accident
(0.3g seismic accelerations), a film at maximum carrying add bending stress maximum value to reach 291MPa, have been more than stress
Limit value 231MPa cannot meet the shockproof requirements of 0.3g；And the present invention uses the fit system of inner tube and outer tube, while in guarantee
The lower face of pipe is flushed with the lower face of outer tube so that and the whole wall thickness of guide pipe lower end increases, and then increases loaded area,
Guide pipe is born under identical load stress value reduces, that is, improves the antidetonation nargin of guide pipe, and guide pipe by
Maximum stress reduce 23%, a film at maximum carrying adds bending stress maximum value to be 224MPa, is less than stress
Limit value 231MPa meets the Seismic Design Requirements of 0.3g.
The end plug is welded at the outer tube lower ending opening.Further, end plug is fixed on outer by the way of welding
It at the lower ending opening of pipe, and is not limited to weld, other fixed forms can be carried out as the case may be, as long as ensuring that end plug can be steady
Surely it is fixed at the lower ending opening of outer tube, completes the outer tube after welding or spinning and end plug formation one is complete compound
Guide pipe is assembled by other components such as guiding duct member dative framves and obtains fuel assembly skeleton, and expanded joint or weld failure only influence
It is single to be oriented to duct member, fuel assembly skeleton is not influenced, the manufacture economy of fuel assembly is improved.
Said inner tube is welded or expanded joint is on the inner wall of outer tube.Inner tube is fixed on outer by the way of welding or expanded joint
The inner wall hypomere of pipe, and it is not limited to welding or expanded joint, other fixed forms can be carried out as the case may be, as long as ensuring inner tube
Can be stably fixed on the inner wall of outer tube, the welding of inner tube or expanded joint carry out before end plug welding, welding or
The actuating station of expansion joint equipment can be stretched into from the outer tube lower end closer apart from breeze way, and then reduce manufacturing process difficulty, simultaneously
Improve the connective stability between outer tube and inner tube.
Discharge orifice is offered on the outer tube.Further, the discharge orifice opened up, for carrying out drainage position to internal tube
Reason.
The lower ending opening of the outer tube and the lower ending opening of inner tube are fixed on by welding or spinning on the end plug.
Outer tube lower end and inner tube lower end are fixed together by welding or spinning process with end plug, are formed and are oriented to duct member, and by being oriented to
The assembling of the other components such as duct member and screen work obtains fuel assembly skeleton, and expanded joint or weld failure only influence individually to be oriented to pipe portion
Part does not influence fuel assembly skeleton, improves the manufacture economy of fuel assembly.
Chamfering is equipped on the inner wall of said inner tube upper end.Preferably, being set on the inner peripheral wall of end on inner pipe
There is chamfering, in order to which control rod plays guiding role in scram to it, avoids the outer wall or lower face and inner tube of control rod
Upper end occur hard collision, it is ensured that the stability of the scram of control rod.
Compared with prior art, the present invention having the following advantages and advantages：
1, a kind of nuclear fuel assembly guide pipe of the present invention, outer tube lower end and inner tube lower end are directly fixed with end plug, enhance
It is oriented to the rigidity of duct member, there is higher anti-seismic performance；Simple in structure, assembling is quick, and manufacturing process requirement is low, improves combustion
Expect the manufacture economy of component；
2, a kind of nuclear fuel assembly guide pipe of the present invention is directly formed in outer tube wall lower position expanded joint or welding inner tube
Breeze way, simple in structure, assembling is quick, and entire fuel assembly skeleton, fuel will not be influenced because of expanded joint or weld failure
It is high that component manufactures economy.
Description of the drawings
Attached drawing described herein is used for providing further understanding the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is the structural schematic diagram of embodiment 2；
Label and corresponding parts title in attached drawing：
The discharge orifices 1-, 2- outer tubes, 3- inner tubes, 31- chamferings, 4- tie points I, 5- tie points II, 6- end plugs.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiment and attached drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation are only used for explaining the present invention, do not make
For limitation of the invention.
Embodiment 1
As shown in Fig. 1~2, the present embodiment include the open outer tube 2 in both ends and be used for 2 lower ending opening of sealed outer pipe
End plug 6, be fixed at least one inner tube 3 in the inner peripheral wall of the outer tube 2, and 2 lower end surface of the outer tube and inner tube 3
Lower end surface flushes.It is high for location fit difficulty after the complicated of guide pipe in the prior art, expanded joint, and guide pipe
Expanded joint part is easy failure, and then the skeleton of entire fuel assembly is caused to fail, in this regard, the guide pipe of applicant's abandoning tradition is set
Meter mode, using outer tube 2 and 3 double layer design of inner tube, and after the lower face of said inner tube 3 is flushed with the lower face of outer tube 2 with
End plug 6 connects, to meet the buffering effect of fuel assembly requirement, it is ensured that guide pipe has enough rigidity, and then it is anti-to improve it
Shock stability；
Further, (the i.e. joint of coolant loss of-coolant accident (LOCA) LOCA and safe shutdown earthquake SSE under design basis accident
Under effect), the stress of guide pipe must satisfy limiting design value, i.e. a film adds bending stress limit value to be that (1.5 times set 231MPa
Count stress intensity), and (patent CN 102750992A) discloses a kind of compound direction for nuclear fuel assembly in the prior art
Pipe, is made of guide pipe, inner sleeve and guide pipe end plug 6, and inner sleeve expanded joint is in the lower part of guide pipe, inner sleeve and guiding pipe end
There are certain spacing between plug 6, and the compound direction pipe is simple in structure, save structural material, and the design of reactor current heap-type needs
Consider certain envelope, the limiting safe earthquake motion of nuclear power station uses ground acceleration 0.3g as input, therefore sets
The design of fuel assembly guide pipe needs the requirement for meeting 0.3g earthquakes under meter basis accident operating mode, but existing disclosed guiding
Its 6 top of guide pipe end plug is hanging section in pipe, and the rigidity of guide pipe lower part is caused to decrease compared with AFA3G guide pipes,
Under design basis accident (0.3g seismic accelerations), a film at maximum carrying adds bending stress maximum value to reach
291MPa has been more than stress limit value 231MPa, cannot meet the shockproof requirements of 0.3g；And the present invention is using inner tube 3 and outer tube 2
Fit system, while ensureing that the lower face of inner tube 3 is flushed with the lower face of outer tube 2 so that the whole wall thickness of guide pipe lower end increases
Add, and then increase loaded area, the stress value that guide pipe is born under identical load reduces, that is, improves guide pipe
Antidetonation nargin, and the maximum stress that guide pipe is subject to reduces 23%, a film at maximum carrying adds bending stress most
Big value is 224MPa, is less than stress limit value 231MPa, meets the Seismic Design Requirements of 0.3g.
Embodiment 2
As shown in Fig. 1~2, on the basis of embodiment 1, end plug 6 is fixed on outer the present embodiment by the way of welding
It at the lower ending opening of pipe 2, and is not limited to weld, other fixed forms can be carried out as the case may be, as long as ensuring that end plug 6 can
It is stably fixed at the lower ending opening of outer tube 2, that is, forms tie point II 5, complete the outer tube 2 after welding or spinning and end
Plug 6 forms a complete compound direction pipe, is assembled by other components such as guiding duct member dative framves and obtains fuel assembly skeleton,
Expanded joint or weld failure only influence individually to be oriented to duct member, do not influence fuel assembly skeleton, improve the manufacture warp of fuel assembly
Ji property.
And inner tube 3 using welding or expanded joint by the way of be fixed on the inner wall hypomere of outer tube 2, and be not limited to welding or it is swollen
It connects, other fixed forms can be carried out as the case may be, as long as ensuring that inner tube 3 can be stably fixed on the inner wall of outer tube 2 i.e.
Can, the welding of inner tube 3 or expanded joint carry out before the welding of end plug 6, and the actuating station of welding or expansion joint equipment can be from distance
Closer 2 lower end of outer tube of breeze way is stretched into, and outer tube 2 carries out expanded joint with inner tube 3 in three axially different height and positions, forms three
A tie point I 4, and then manufacturing process difficulty is reduced, while improving the connective stability between outer tube 2 and inner tube 3.Wherein, it opens
If discharge orifice 1, for carrying out drainage sunk well to the inside of inner tube 3.
Embodiment 3
As shown in Fig. 1~2, in the present embodiment, the lower ending opening of the outer tube 2 and the lower ending opening of inner tube 3 pass through weldering
It connects or spinning is fixed on the end plug 6.2 lower end of outer tube and 3 lower end of inner tube are fixed by welding or spinning process with end plug 6
Together, and on the outer wall of end plug 6 a spinning slot is formed, so that outer tube 2, inner tube 3 and end plug 6 form guide pipe
Component, and assembled by other components such as guiding duct member dative framves and obtain fuel assembly skeleton, expanded joint or weld failure only influence
It is single to be oriented to duct member, fuel assembly skeleton is not influenced, the manufacture economy of fuel assembly is improved.
Preferably, on the inner peripheral wall of 3 upper end of inner tube be equipped with chamfering 31, in order to control rod in scram to it
Guiding role is played, avoids the outer wall of control rod or the upper end generation hard collision of lower face and inner tube 3, it is ensured that control rod
The stability of scram.
The above-mentioned guiding pipe processing technique for nuclear fuel assembly includes the following steps：
A. the suitable outer tube 2 of size and inner tube 3 are chosen；
B. inner tube 3 is fixed by expanded joint or welding procedure in 2 inner wall lower position of outer tube so that 2 lower end of outer tube and inner tube 3
Lower end is in contact with end plug 6；
C. 2 lower ending opening of outer tube and 3 lower ending opening of inner tube are fixed on end plug 6 by welding or spinning process.
Wherein, said welding method includes but is not limited to electron beam weldering, TIG welderings and piezoresistive weldering.
Above-described specific implementation mode has carried out further the purpose of the present invention, technical solution and advantageous effect
It is described in detail, it should be understood that the foregoing is merely the specific implementation mode of the present invention, is not intended to limit the present invention
Protection domain, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (6)
1. a kind of nuclear fuel assembly guide pipe, it is characterised in that：Including the open outer tube in both ends (2) and for outside sealing
The end plug (6) for managing (2) lower ending opening is fixed at least one inner tube (3) in the inner peripheral wall of the outer tube (2), and described outer
Pipe (2) lower end surface is flushed with the lower end surface of inner tube (3).
2. a kind of fuel assembly guide pipe according to claim 1, it is characterised in that：The end plug (6) is welded on described
At outer tube (2) lower ending opening.
3. a kind of fuel assembly guide pipe according to claim 1, it is characterised in that：Said inner tube (3) weld or it is swollen
It is connected on the inner wall of outer tube (2).
4. a kind of fuel assembly guide pipe according to claim 1, it is characterised in that：Stream is offered on the outer tube (2)
Water hole (1).
5. a kind of fuel assembly guide pipe according to claim 1, it is characterised in that：The lower ending opening of the outer tube (2)
And the lower ending opening of inner tube (3) is fixed on by welding or spinning on the end plug (6).
6. a kind of fuel assembly guide pipe according to Claims 1 to 5 any one, it is characterised in that：In said inner tube
(3) inner wall of upper end is equipped with chamfering (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810443637.6A CN108538410A (en) | 2018-05-10 | 2018-05-10 | A kind of nuclear fuel assembly guide pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810443637.6A CN108538410A (en) | 2018-05-10 | 2018-05-10 | A kind of nuclear fuel assembly guide pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108538410A true CN108538410A (en) | 2018-09-14 |
Family
ID=63477201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810443637.6A Pending CN108538410A (en) | 2018-05-10 | 2018-05-10 | A kind of nuclear fuel assembly guide pipe |
Country Status (1)
| Country | Link |
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| CN (1) | CN108538410A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114352834A (en) * | 2021-12-14 | 2022-04-15 | 中国核动力研究设计院 | Hierarchical buffering high-shock-resistance bending-resistant pipe-in-pipe guide pipe and fuel assembly |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102360570A (en) * | 2011-09-01 | 2012-02-22 | 中科华核电技术研究院有限公司 | Telescoping guide tube and light-water reactor nuclear power station fuel assembly |
| CN102750992A (en) * | 2012-07-17 | 2012-10-24 | 中国核动力研究设计院 | Composite guide tube for nuclear fuel component and composite guide tube processing technology |
-
2018
- 2018-05-10 CN CN201810443637.6A patent/CN108538410A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102360570A (en) * | 2011-09-01 | 2012-02-22 | 中科华核电技术研究院有限公司 | Telescoping guide tube and light-water reactor nuclear power station fuel assembly |
| CN102750992A (en) * | 2012-07-17 | 2012-10-24 | 中国核动力研究设计院 | Composite guide tube for nuclear fuel component and composite guide tube processing technology |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114352834A (en) * | 2021-12-14 | 2022-04-15 | 中国核动力研究设计院 | Hierarchical buffering high-shock-resistance bending-resistant pipe-in-pipe guide pipe and fuel assembly |
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Application publication date: 20180914 |
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