CN208111091U - A kind of spacer grid of fuel assembly and fuel assembly of band buckle - Google Patents
A kind of spacer grid of fuel assembly and fuel assembly of band buckle Download PDFInfo
- Publication number
- CN208111091U CN208111091U CN201721772776.0U CN201721772776U CN208111091U CN 208111091 U CN208111091 U CN 208111091U CN 201721772776 U CN201721772776 U CN 201721772776U CN 208111091 U CN208111091 U CN 208111091U
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- lattice cell
- fuel assembly
- grid
- spacer
- buckle
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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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- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The utility model relates to fuel assembly technical fields, specifically disclose the spacer grid of fuel assembly and fuel assembly of a kind of band buckle, and the grid spacer is rearranged by lattice cell, are equipped with outer band in the outside of lattice cell arrangement；The lattice cell section is octagon, processes card hole at interval of a face on eight faces of lattice cell；Buckle is fixed on lattice cell across card hole, for clamping fuel element and generating the effect mixed to coolant.The fuel assembly includes upper tube socket, annular fuel element, bottom nozzle, guide pipe, gauge pipe and the grid spacer.The utility model grid spacer can be suitable for annular fuel element, located lateral is provided to fuel element and generates certain effect of mixing to coolant, while adjacent lattice cell can also be fixed using buckle, and does not have to be welded and fixed again, reduce manufacturing process, reduces costs.
Description
Technical field
The utility model belongs to fuel assembly technical field, and in particular to a kind of spacer grid of fuel assembly of band buckle and
Fuel assembly.
Background technique
In nuclear power plant reactor operational process, the performance of nuclear fuel be influence nuclear reactor safety and economy it is important because
Element.Therefore the research of fuel element is placed on status very outstanding always in the world, by the design of optimization fuel element, used
The methods of advanced configuration material, improvement component manufacturing process, are continuously improved the various performances of nuclear fuel element, promote nuclear power to more
Safe and more economical direction is developed.
Existing PWR fuel assembly design in, fuel rod generally using grid spacer clamp it is hanging by the way of.Positioning
Screen work plays a part of support clamping to fuel element, and needs to resist the gravity of fuel element, due to the effect of irradiation,
The chucking power for clamping the spring of fuel rod can strongly reduce, and fuel rod can generally be fallen on bottom nozzle, make in the flowing of coolant
Under, fuel rod may upper and lower play, this will lead to the risk of fuel rod breakage.
To optimize the parameter of fuel element, and general fuel assembly form construction design is used, so that novel component
It can be suitable for current mature reactor core.Novel annular fuel element is such as used, outer diameter becomes larger, and weight increases, at this time
The chucking power of required grid spacer may increase about 2-4 times, can place that such as spring, just the space of convex clamping piece has become smaller,
This probability that fuel element is fallen at runtime on bottom nozzle increases, and during to open heap again after cold-refueling
The probability of play also increases above and below fuel element.
Meanwhile in the design and manufacture of existing spacer grid of fuel assembly, grid spacer is all made of inside and outside band substantially.
Due to the complexity of its band, 30 multiple kinds of molds are needed when manufacturing.After mold determines, to change grid spacer
Characteristic, such as flow resistance generate better effect etc. to distribution of the coolant fuel assembly, need to change wherein almost
The shape of all molds, considerably increases work load.
Therefore, it needs to design a kind of novel spacer grid of fuel assembly, with overcome the deficiencies in the prior art.
Summary of the invention
The purpose of this utility model is to provide a kind of spacer grid of fuel assembly of band buckle, can clamp annular fuel
Element, and include the fuel assembly of above-mentioned grid spacer.
The technical solution of the utility model is as follows：
A kind of spacer grid of fuel assembly of band buckle, is rearranged by lattice cell, is equipped with outer item in the outside of lattice cell arrangement
Band；
The lattice cell section is octagon, processes card hole at interval of a face on eight faces of lattice cell；
Buckle is fixed on lattice cell across card hole, for clamping fuel element and generating the effect mixed to coolant.
The height of outer band and the height of lattice cell are identical, are equipped with guide vane in the top edge of outer band and lower edge, prevent
Only fuel assembly hooks mutually when assembly.
The lattice cell connects two-by-two, is fixed by way of spot welding, forms the arrangement of M × M.
The value range of the M is 3~17.
The value of M is one in 5,9,13,15.
The card hole is set on the face that two neighboring lattice cell connects.
The card hole is set on the face that two neighboring lattice cell does not connect.
One face is equipped with N number of card hole, N >=2.
The shape of the buckle is " B " shape, I-shaped, sugarcoated haws shape, triangle or pentagon.
By lattice cell arrange in a lattice cell take out, the position of lattice cell vacancy is as guiding tube passage or instrument tube passage.
The instrument tube passage has one, is located at the center that lattice cell is arranged with M × M；Guiding tube passage has several
It is a, centered on instrument tube passage, it is symmetrically arranged.
Guide pipe is set in guiding tube passage, is welded and fixed with the barrel lateral surface of lattice cell.
Quantity, the position consistency of the guiding tube passage of the guiding tube passage and upper tube socket.
Gauge pipe is set in instrument tube passage, is welded and fixed with the barrel lateral surface of lattice cell.
A kind of fuel assembly, including upper tube socket, annular fuel element, bottom nozzle, guide pipe, gauge pipe further include described
Grid spacer.
Annular fuel element, guide pipe and the gauge pipe is inserted in grid spacer；Grid spacer have it is multiple, successively
It is axially disposed；The upper end of guide pipe and gauge pipe is fixedly connected with upper tube socket, and lower end is fixedly connected with bottom nozzle；
Bottom nozzle is inserted into the lower end of annular fuel element, is fixedly connected with bottom nozzle, when annular fuel element generates irradiation
When growth, expand upwards.
The beneficial effects of the utility model are：
(1) the utility model grid spacer can be suitable for the fuel element of bigger outer diameter, such as annular fuel element, to combustion
Expect that element provides located lateral and generates certain effect of mixing to coolant.
(2) common rod shaped fuel element can also be applied in the utility model grid spacer, and can make coolant and combustion
Material element more fully contacts.
(3) the utility model grid spacer can use buckle and adjacent lattice cell be fixed, and not have to weld again solid
It is fixed, reduce manufacturing process, reduces costs.
(4) the utility model fuel assembly is using multiple grid spacer clamping fuel elements being axially arranged, to fuel member
Part is fixed, and keeps fuel element spacing, so that fuel element is located at fixed position in the reactor core of PWR nuclear power plant,
And guide pipe can be made by cross-brace and positioning.
(5) the utility model fuel assembly uses fuel element lower end stationary structure, avoids hanging type fuel element
When being irradiated by the long period, grid spacer chucking power reduces, and fuel element is caused to fall.
Detailed description of the invention
Fig. 1 is one schematic diagram of embodiment；
Fig. 2 is two schematic diagram of embodiment；
Fig. 3 is three schematic diagram of embodiment；
Fig. 4 is example IV schematic diagram.
In figure：1. lattice cell；2. card hole；3. buckle；4. outer band；5. guide vane；6. being oriented to tube passage.
Specific embodiment
With reference to the accompanying drawing and specific embodiment is described in further detail the utility model.
Embodiment one
The grid spacer is rearranged by lattice cell 1, and 1 section of lattice cell is octagon, in eight faces of lattice cell 1
On at interval of face process card hole 2；
The lattice cell 1 connects two-by-two, is fixed by way of spot welding, forms 15 × 15 arrangement.In lattice cell arrangement
Outside is equipped with outer band 4, and the height of outer band 4 is identical as the height of lattice cell 1.
It is equipped with guide vane 5 in the top edge of outer band 4 and lower edge, prevents fuel assembly mutual hook when assembly
It hangs.
By lattice cell arrange in a lattice cell 1 take out, the position of 1 vacancy of lattice cell is logical as guiding tube passage 6 or gauge pipe
Road.
The instrument tube passage has one, positioned at the center of lattice cell arrangement；Gauge pipe is set in instrument tube passage,
It is welded and fixed with the barrel lateral surface of lattice cell 1.
The guiding tube passage 6 has several, centered on instrument tube passage, is symmetrically arranged.Guide pipe is set to guiding
In tube passage 6, it is welded and fixed with the barrel lateral surface of lattice cell 1.The guiding tube passage of the guiding tube passage 6 and upper tube socket
Quantity, position consistency.
As shown in Figure 1, the card hole 2 on the face that two neighboring lattice cell 1 does not connect, is set on a face, there are four cards
Hole 2, arranges at 2x2.
The shape of the buckle 3 be it is I-shaped, fixed across card hole 2 and 1 wall of lattice cell, 3 smooth one sides of buckle are set on grid
1 inside of member, for clamping fuel element and generating the effect mixed to coolant.
Embodiment two
The grid spacer is rearranged by lattice cell 1, and 1 section of lattice cell is octagon, in eight faces of lattice cell 1
On at interval of face process card hole 2；
The lattice cell 1 connects two-by-two, is fixed by way of spot welding, forms 17 × 17 arrangement.In lattice cell arrangement
Outside is equipped with outer band 4, and the height of outer band 4 is identical as the height of lattice cell 1.
It is equipped with guide vane 5 in the top edge of outer band 4 and lower edge, prevents fuel assembly mutual hook when assembly
It hangs.
By lattice cell arrange in a lattice cell 1 take out, the position of 1 vacancy of lattice cell is logical as guiding tube passage 6 or gauge pipe
Road.
The instrument tube passage has one, positioned at the center of lattice cell arrangement；Gauge pipe is set in instrument tube passage,
It is welded and fixed with the barrel lateral surface of lattice cell 1.
The guiding tube passage 6 has several, centered on instrument tube passage, is symmetrically arranged.Guide pipe is set to guiding
In tube passage 6, it is welded and fixed with the barrel lateral surface of lattice cell 1.The guiding tube passage of the guiding tube passage 6 and upper tube socket
Quantity, position consistency.
As shown in Fig. 2, the card hole 2 on the face that two neighboring lattice cell 1 does not connect, is set on a face, there are two cards
Hole 2, longitudinal arrangement.
The shape of the buckle 3 is " B " shape, is fixed across card hole 2 and 1 wall of lattice cell, and 3 smooth one sides of buckle are set to lattice cell
1 inside, for clamping fuel element and generating the effect mixed to coolant.
Embodiment three
The grid spacer is rearranged by lattice cell 1, and 1 section of lattice cell is octagon, in eight faces of lattice cell 1
On at interval of face process card hole 2；
The lattice cell 1 connects two-by-two, is fixed by way of spot welding, forms 9 × 9 arrangement.In the outer of lattice cell arrangement
Side is equipped with outer band 4, and the height of outer band 4 is identical as the height of lattice cell 1.
It is equipped with guide vane 5 in the top edge of outer band 4 and lower edge, prevents fuel assembly mutual hook when assembly
It hangs.
By lattice cell arrange in a lattice cell 1 take out, the position of 1 vacancy of lattice cell is logical as guiding tube passage 6 or gauge pipe
Road.
The instrument tube passage has one, positioned at the center of lattice cell arrangement；Gauge pipe is set in instrument tube passage,
It is welded and fixed with the barrel lateral surface of lattice cell 1.
The guiding tube passage 6 has several, centered on instrument tube passage, is symmetrically arranged.Guide pipe is set to guiding
In tube passage 6, it is welded and fixed with the barrel lateral surface of lattice cell 1.The guiding tube passage of the guiding tube passage 6 and upper tube socket
Quantity, position consistency.
As shown in figure 3, the card hole 2 on the face that two neighboring lattice cell 1 connects, is set on a face, there are six card holes
2, it arranges and arranges at three rows two.
The shape of the buckle 3 is the figure of eight, there are three, two card holes 2 and 1 wall of lattice cell being each passed through in a line are solid
It is fixed, for clamping fuel element and generating the effect mixed to coolant.
Example IV
The grid spacer is rearranged by lattice cell 1, and 1 section of lattice cell is octagon, in eight faces of lattice cell 1
On at interval of face process card hole 2；
The lattice cell 1 connects two-by-two, is fixed by way of spot welding, forms the arrangement of 13x13.In the outer of lattice cell arrangement
Side is equipped with outer band 4, and the height of outer band 4 is identical as the height of lattice cell 1.
It is equipped with guide vane 5 in the top edge of outer band 4 and lower edge, prevents fuel assembly mutual hook when assembly
It hangs.
By lattice cell arrange in a lattice cell 1 take out, the position of 1 vacancy of lattice cell is logical as guiding tube passage 6 or gauge pipe
Road.
The instrument tube passage has one, positioned at the center of lattice cell arrangement；Gauge pipe is set in instrument tube passage,
It is welded and fixed with the barrel lateral surface of lattice cell 1.
The guiding tube passage 6 has several, centered on instrument tube passage, is symmetrically arranged.Guide pipe is set to guiding
In tube passage 6, it is welded and fixed with the barrel lateral surface of lattice cell 1.The guiding tube passage of the guiding tube passage 6 and upper tube socket
Quantity, position consistency.
As shown in figure 4, the card hole 2 on the face that two neighboring lattice cell 1 does not connect, is set on a face, there are three cards
Hole 2, forms a line.
It is described buckle 3 shape be sugarcoated haws shape, fixed across card hole 2 and 1 wall of lattice cell, for clamp fuel element and
The effect mixed is generated to coolant.
Embodiment five
The grid spacer is rearranged by lattice cell 1, and 1 section of lattice cell is octagon, in eight faces of lattice cell 1
On at interval of face process card hole 2；
The lattice cell 1 connects two-by-two, is fixed by way of spot welding, forms 3 × 3 arrangement.In the outer of lattice cell arrangement
Side is equipped with outer band 4, and the height of outer band 4 is identical as the height of lattice cell 1.
It is equipped with guide vane 5 in the top edge of outer band 4 and lower edge, prevents fuel assembly mutual hook when assembly
It hangs.
By lattice cell arrange in a lattice cell 1 take out, the position of 1 vacancy of lattice cell is logical as guiding tube passage 6 or gauge pipe
Road.
The instrument tube passage has one, positioned at the center of lattice cell arrangement；Gauge pipe is set in instrument tube passage,
It is welded and fixed with the barrel lateral surface of lattice cell 1.
The guiding tube passage 6 has several, centered on instrument tube passage, is symmetrically arranged.Guide pipe is set to guiding
In tube passage 6, it is welded and fixed with the barrel lateral surface of lattice cell 1.The guiding tube passage of the guiding tube passage 6 and upper tube socket
Quantity, position consistency.
The card hole 2 is set on the face that does not connect of two neighboring lattice cell 1, sets that there are three card holes 2 on a face, is arranged as
Triangle.
The shape of the buckle 3 is triangle, is fixed across card hole 2 and 1 wall of lattice cell, and 3 smooth one sides of buckle are set to grid
1 inside of member, for clamping fuel element and generating the effect mixed to coolant.
Embodiment six
The grid spacer is rearranged by lattice cell 1, and 1 section of lattice cell is octagon, in eight faces of lattice cell 1
On at interval of face process card hole 2；
The lattice cell 1 connects two-by-two, is fixed by way of spot welding, forms 5 × 5 arrangement.In the outer of lattice cell arrangement
Side is equipped with outer band 4, and the height of outer band 4 is identical as the height of lattice cell 1.
It is equipped with guide vane 5 in the top edge of outer band 4 and lower edge, prevents fuel assembly mutual hook when assembly
It hangs.
By lattice cell arrange in a lattice cell 1 take out, the position of 1 vacancy of lattice cell is logical as guiding tube passage 6 or gauge pipe
Road.
The instrument tube passage has one, positioned at the center of lattice cell arrangement；Gauge pipe is set in instrument tube passage,
It is welded and fixed with the barrel lateral surface of lattice cell 1.
The guiding tube passage 6 has several, centered on instrument tube passage, is symmetrically arranged.Guide pipe is set to guiding
In tube passage 6, it is welded and fixed with the barrel lateral surface of lattice cell 1.The guiding tube passage of the guiding tube passage 6 and upper tube socket
Quantity, position consistency.
The card hole 2 is set on the face that does not connect of two neighboring lattice cell 1, sets that there are five card holes 2 on a face, is arranged as
Pentagon.
The shape of the buckle 3 is pentagon, is fixed across card hole 2 and 1 wall of lattice cell, and 3 smooth one sides of buckle are set to grid
1 inside of member, for clamping fuel element and generating the effect mixed to coolant.
The utility model fuel assembly for nuclear reactor, including upper tube socket, annular fuel element, bottom nozzle, guide pipe, instrument
Grid spacer described in pipe and any of the above-described embodiment.
Annular fuel element, guide pipe and the gauge pipe is inserted in grid spacer；Grid spacer have it is multiple, successively
It is axially disposed；The upper end of guide pipe and gauge pipe is fixedly connected with upper tube socket, and lower end is fixedly connected with bottom nozzle；
Bottom nozzle is inserted into the lower end of annular fuel element, is fixedly connected with bottom nozzle, when annular fuel element generates irradiation
When growth, expand upwards.
The upper end of the upper tube socket is provided with upper tube socket holddown spring and upper tube socket dowel hole.Upper tube socket holddown spring
There are four altogether, it is separately positioned on the four edges at the top of tube socket, for compressing fuel assembly.Upper tube socket dowel hole shares two
It is a, it is separately positioned on diagonal at the top of tube socket, passes through the positioning realized with bayonet fittings to fuel assembly.
Guide pipe mounting hole, the first discharge orifice of bottom nozzle and the bottom nozzle of bottom nozzle are respectively arranged in the upper end of bottom nozzle
Second discharge orifice.The position of the guide pipe mounting hole of bottom nozzle is corresponding with the position of guide pipe, is used for fixed guide pipe, down tube
The first discharge orifice of seat and the second discharge orifice of bottom nozzle are for passing through coolant.
The annular fuel element can keep or promote existing reactor safety abundant due to using ring structure
Under the premise of degree, reactor core output power density is substantially improved, hence it is evident that improve the economy of nuclear power.Under accidental conditions, annular
Fuel element bulk temperature is far below rod shaped fuel element；Under major accident operating condition, the temperature of annular fuel pellet is low, energy storage
The process that few feature can delay fuel element cladding to fail, for subsequent accident mitigation and emergency response provide preciousness when
Between, improve the inherent safety of PWR nuclear power plant.Annular fuel element can also reduce the flow resistance of component, reactor core
Resistance reduces, and the output power of PWR nuclear power plant primary Ioops pump can be effectively reduced, and promotes service life.
Claims (16)
1. a kind of spacer grid of fuel assembly of band buckle, it is characterised in that：The grid spacer is by lattice cell (1) arrangement group
At in the outside of lattice cell arrangement equipped with outer band (4)；
Lattice cell (1) section is octagon, processes card hole (2) at interval of a face on eight faces of lattice cell (1)；
It buckles (3) and passes through card hole (2), be fixed on lattice cell (1), mixed for clamping fuel element and being generated to coolant
Effect.
2. a kind of spacer grid of fuel assembly of band buckle as described in claim 1, it is characterised in that：The height of outer band (4)
Degree is identical as the height of lattice cell (1), is equipped with guide vane (5) in the top edge of outer band (4) and lower edge, prevents fuel assembly
It is hooked mutually when assembly.
3. a kind of spacer grid of fuel assembly of band buckle as claimed in claim 2, it is characterised in that：The lattice cell (1)
Connect two-by-two, fixed by way of spot welding, forms the arrangement of M × M.
4. a kind of spacer grid of fuel assembly of band buckle as claimed in claim 3, it is characterised in that：The value of the M
Range is 3~17.
5. a kind of spacer grid of fuel assembly of band buckle as claimed in claim 4, it is characterised in that：The value of M is 5,9,
One in 13,15.
6. a kind of spacer grid of fuel assembly of band buckle as claimed in claim 4, it is characterised in that：The card hole (2)
On the face that two neighboring lattice cell (1) connects.
7. a kind of spacer grid of fuel assembly of band buckle as claimed in claim 4, it is characterised in that：The card hole (2)
On the face that two neighboring lattice cell (1) does not connect.
8. a kind of spacer grid of fuel assembly of band buckle as claimed in claims 6 or 7, it is characterised in that：It is set on one face
There are N number of card hole (2), N >=2.
9. a kind of spacer grid of fuel assembly of band buckle as claimed in claim 8, it is characterised in that：The buckle (3)
Shape is " B " shape, I-shaped, sugarcoated haws shape, triangle or pentagon.
10. a kind of spacer grid of fuel assembly of band buckle as claimed in claim 9, it is characterised in that：During lattice cell is arranged
A lattice cell (1) take out, the position of lattice cell (1) vacancy is as guiding tube passage (6) or instrument tube passage.
11. a kind of spacer grid of fuel assembly of band buckle as claimed in claim 10, it is characterised in that：The gauge pipe
Channel has one, is located at the center that lattice cell (1) is arranged with M × M；Guiding tube passage (6) has several, with instrument tube passage
Centered on, it is symmetrically arranged.
12. a kind of spacer grid of fuel assembly of band buckle as claimed in claim 11, it is characterised in that：Guide pipe is set to and leads
Into tube passage (6), it is welded and fixed with the barrel lateral surface of lattice cell (1).
13. a kind of spacer grid of fuel assembly of band buckle as claimed in claim 12, it is characterised in that：The guide pipe
Quantity, the position consistency of the guiding tube passage of channel (6) and upper tube socket.
14. a kind of spacer grid of fuel assembly of band buckle as claimed in claim 13, it is characterised in that：Gauge pipe is set to instrument
In table tube passage, it is welded and fixed with the barrel lateral surface of lattice cell (1).
15. a kind of fuel assembly, including upper tube socket, annular fuel element, bottom nozzle, guide pipe, gauge pipe, it is characterised in that：
It further include such as the described in any item grid spacers of claim 9~14.
16. a kind of fuel assembly as claimed in claim 15, it is characterised in that：The annular fuel element, guide pipe and
Gauge pipe is inserted in grid spacer；Grid spacer have it is multiple, it is successively axially disposed；The upper end of guide pipe and gauge pipe with it is upper
Tube socket is fixedly connected, and lower end is fixedly connected with bottom nozzle；
Bottom nozzle is inserted into the lower end of annular fuel element, is fixedly connected with bottom nozzle, when annular fuel element generates irradiation growth
When, it expands upwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721772776.0U CN208111091U (en) | 2017-12-19 | 2017-12-19 | A kind of spacer grid of fuel assembly and fuel assembly of band buckle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721772776.0U CN208111091U (en) | 2017-12-19 | 2017-12-19 | A kind of spacer grid of fuel assembly and fuel assembly of band buckle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208111091U true CN208111091U (en) | 2018-11-16 |
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ID=64131115
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721772776.0U Active CN208111091U (en) | 2017-12-19 | 2017-12-19 | A kind of spacer grid of fuel assembly and fuel assembly of band buckle |
Country Status (1)
| Country | Link |
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| CN (1) | CN208111091U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109935367A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | A kind of spacer grid of fuel assembly and fuel assembly of band buckle |
-
2017
- 2017-12-19 CN CN201721772776.0U patent/CN208111091U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109935367A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | A kind of spacer grid of fuel assembly and fuel assembly of band buckle |
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