CN207731669U - A kind of spacer grid of fuel assembly and fuel assembly with angle plug-in unit - Google Patents
A kind of spacer grid of fuel assembly and fuel assembly with angle plug-in unit Download PDFInfo
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- CN207731669U CN207731669U CN201721772768.6U CN201721772768U CN207731669U CN 207731669 U CN207731669 U CN 207731669U CN 201721772768 U CN201721772768 U CN 201721772768U CN 207731669 U CN207731669 U CN 207731669U
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- unit
- fuel assembly
- plug
- lattice cell
- spacer
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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 is related to fuel assembly technical fields, specifically disclose a kind of spacer grid of fuel assembly and fuel assembly with angle plug-in unit, and the grid spacer is rearranged two-by-two by lattice cell, and outer band is equipped in the outside of lattice cell arrangement；The lattice cell is four sides cylinder, including cylinder angle and barrel, and edged surface is processed at cylinder angle；Upper slot is processed on edged surface, for coordinating grafting with plug-in unit.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, provide located lateral to fuel element and generate certain effect of mixing to coolant.The utility model fuel assembly is using multiple grid spacer clamping fuel elements being axially arranged, fuel element is fixed, and keep 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.
Description
Technical field
The utility model belongs to fuel assembly technical field, and in particular to a kind of spacer grid of fuel assembly with angle plug-in unit
And fuel assembly.
Background technology
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 optimizing fuel element design, using
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 be clamped 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,
Be clamped fuel rod spring or it is just convex can relax, its corresponding chucking power can strongly reduce, and fuel rod can generally be fallen in bottom nozzle
On, under the mobilization of coolant, fuel rod may upper and lower play, this can lead to the risk of fuel rod breakage.
To optimize the parameter of fuel element, and use general fuel assembly form construction design so that novel component
It can be suitable for current ripe reactor core.Novel annular fuel element, outer diameter is such as used to become larger, weight increases, at this time
The chucking power of required grid spacer may increase about 2-4 times, can place such as spring, the space of rigid convex clamping piece has become ten
Point narrow, this makes fuel element fall the probability on bottom nozzle at runtime and increase, and to open heap again after cold-refueling
During fuel element the probability of play also increases up and down.
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 determination, to change grid spacer
Characteristic, such as chucking power size that grid spacer is capable of providing, need the shape for changing wherein nearly all mold, increase
Work load is added.
Therefore, there is an urgent need for designing a kind of novel spacer grid of fuel assembly, with overcome the deficiencies in the prior art.
Invention content
The purpose of this utility model is to provide a kind of spacer grid of fuel assembly with angle plug-in unit, and annular combustion can be clamped
Expect element, and includes 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 with angle plug-in unit, the grid spacer is rearranged two-by-two by lattice cell, in grid
The outside of identical permutation is equipped with outer band；
The lattice cell is four sides cylinder, including cylinder angle and barrel, and edged surface is processed at cylinder angle；
Upper slot is processed on edged surface, for coordinating grafting with plug-in unit.
The edged surface is plane or curved surface.
The plug-in unit includes single angle plug-in unit and diagonal plug-in unit.
The diagonal plug-in unit includes the elastic arm that connecting rod and two are respectively arranged on connecting rod two end.
It is equipped with upper slot or lower slot in the centre position of the connecting rod, the diagonal plug-in unit of each two coordinates grafting, forms ten
Font plug-in unit.
It is respectively symmetrically equipped with lower slot at the both ends of the connecting rod, for two lattice cell edged surface grafting with diagonal position
Single angle plug-in unit includes single pole and the elastic arm set on single pole one end.
One end that elastic arm is equipped in the single pole is equipped with lower slot, and grafting is set on the not lattice cell edged surface of diagonal relationship,
The other end of single pole and the lateral wall of lattice cell are welded and fixed.
There are two support arms for the elastic arm, are divided into first support arm and second support arm.
The first support arm is connected with second support arm one end, and the other end is at an angle of alpha to each other bending, α≤180 °.
It is respectively equipped with convex block, one end and the fuel member of convex block in described disjunct one end of first support arm and second support arm
Part is contacted at line, and the other end of convex block is opposite with edged surface as positive stop end.
The height of the outer band is identical as the height of lattice cell, and guiding is equipped in the top edge of outer band and lower edge
The wing prevents fuel assembly from being hooked mutually when assembly.
The lattice cell connects two-by-two, is fixed by way of spot welding, forms the arrangement of N × N.
A lattice cell during lattice cell is arranged takes out, and the position of lattice cell vacancy is as guiding tube passage or instrument tube passage.
There are one the instrument tube passages, is located at the center that lattice cell is arranged with N × N；Guiding tube passage has several
It is a, centered on instrument tube passage, it is symmetrically arranged.
Guide pipe, which is set to, to be oriented in tube passage, is welded and fixed with the barrel lateral surface of lattice cell.
Quantity, the position consistency for being oriented to tube passage and the guiding tube passage of 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 utilize the edged surface of elastic arm and lattice cell to match, after dongle configuration relaxation,
It remains to play the role of limit to the position of fuel element so that fuel element keeps vertical in fuel assembly.
(4) the single angle plug-in unit and diagonal plug-in unit that the utility model grid spacer uses can avoid fuel element from being inserted in assembly
Its outer envelope is worn during pulling out.
(5) 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 and 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.
(6) 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.
Description of the drawings
Fig. 1 is screen work axis surveys view；
Fig. 2 is single angle plug-in unit schematic diagram；
Fig. 3 is diagonal plug-in unit schematic diagram；
Fig. 4 is two diagonal plug-in unit assembling schematic diagrams.
In figure：1. lattice cell；2. plug-in unit；3. connecting rod；4. single pole；5. elastic arm；6. first support arm；7. second support arm；8. convex block；
9. outer band；10. guide vane；11. being oriented to tube passage.
Specific implementation mode
Below in conjunction with the accompanying drawings and specific embodiment is described in further detail the utility model.
As shown in Figure 1, a kind of spacer grid of fuel assembly with angle plug-in unit, is rearranged two-by-two by lattice cell 1, in lattice cell 1
The outside of arrangement is equipped with outer band 9；
The lattice cell 1 is four sides cylinder, including cylinder angle and barrel, and edged surface is processed at cylinder angle, and edged surface is plane or song
Face.
Upper slot is processed on edged surface, for coordinating grafting with plug-in unit 2.
The plug-in unit 2 includes single angle plug-in unit and diagonal plug-in unit.
As shown in Fig. 2, single angle plug-in unit includes single pole 4 and the elastic arm 5 set on 4 one end of single pole.It is equipped with bullet in single pole 4
One end of arm 5 is equipped with lower slot, and grafting is set on not 1 edged surface of lattice cell of diagonal relationship, the other end and the lattice cell 1 of single pole 4
Lateral wall is welded and fixed.
As shown in Figure 3,4, the diagonal plug-in unit includes the elastic arm 5 that connecting rod 3 and two are respectively arranged on 3 both ends of connecting rod.
The centre position of connecting rod 3 is equipped with upper slot or lower slot, and the diagonal plug-in unit of each two coordinates grafting, forms cross plug-in unit.Even
The both ends of bar 3 are respectively symmetrically equipped with lower slot, for two lattice cells, the 1 edged surface grafting with diagonal position.
There are two support arms for the elastic arm 5, are divided into first support arm 6 and second support arm 7.First support arm 6 and second support arm 7 one
End is connected, and the other end is at an angle of alpha to each other bending, α≤180 °.In described 7 disjunct one end of first support arm 6 and second support arm
It is respectively equipped with convex block 8, one end of convex block 8 is contacted with fuel element at line, and the other end of convex block 8 is as positive stop end and edged surface phase
It is right.
The height of the outer band 9 is identical as the height of lattice cell 1, is equipped with and leads in the top edge of outer band 9 and lower edge
Guide vane 10 prevents fuel assembly from being hooked mutually when assembly.
The lattice cell 1 connects two-by-two, is fixed by way of spot welding, forms the arrangement of N × N.
A lattice cell 1 during lattice cell is arranged takes out, and the position of 1 vacancy of lattice cell is logical as guiding tube passage 11 or gauge pipe
Road.
There are one the instrument tube passages, is located 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 11 has several, centered on instrument tube passage, is symmetrically arranged.Guide pipe, which is set to, to be oriented to
In tube passage 11, it is welded and fixed with the barrel lateral surface of lattice cell 1.The guiding tube passage of the guiding tube passage 11 and upper tube socket
Quantity, position consistency.
The utility model fuel assembly for nuclear reactor, including upper tube socket, annular fuel element, bottom nozzle, guide pipe, instrument
Pipe and the above-mentioned spacer grid of fuel assembly with angle plug-in unit.
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.
It is respectively arranged with guide pipe mounting hole, the first discharge orifice of bottom nozzle and the bottom nozzle of bottom nozzle 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 as a result of loop configuration
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 mode, the temperature of annular fuel pellet is low, energy storage
Few feature can delay the process that fuel element cladding fails, 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 can effectively reduce the output power of PWR nuclear power plant primary Ioops pump, promotes service life.
Claims (20)
1. a kind of spacer grid of fuel assembly with angle plug-in unit, it is characterised in that：The grid spacer is two rows of by lattice cell (1) two
Row composition is equipped with outer band (9) in the outside that lattice cell (1) arranges；
The lattice cell (1) is four sides cylinder, including cylinder angle and barrel, and edged surface is processed at cylinder angle；
Upper slot is processed on edged surface, for coordinating grafting with plug-in unit (2).
2. a kind of spacer grid of fuel assembly with angle plug-in unit as described in claim 1, it is characterised in that：The edged surface is
Plane or curved surface.
3. a kind of spacer grid of fuel assembly with angle plug-in unit as claimed in claim 2, it is characterised in that：The plug-in unit
(2) include single angle plug-in unit and diagonal plug-in unit.
4. a kind of spacer grid of fuel assembly with angle plug-in unit as claimed in claim 3, it is characterised in that：Described is diagonal slotting
Part includes the elastic arm (5) that connecting rod (3) and two are respectively arranged on connecting rod (3) both ends.
5. a kind of spacer grid of fuel assembly with angle plug-in unit as claimed in claim 4, it is characterised in that：In the connecting rod
(3) centre position is equipped with upper slot or lower slot, and the diagonal plug-in unit of each two coordinates grafting, forms cross plug-in unit.
6. a kind of spacer grid of fuel assembly with angle plug-in unit as claimed in claim 5, it is characterised in that：In the connecting rod
(3) both ends are respectively symmetrically equipped with lower slot, for two lattice cell (1) edged surface grafting with diagonal position.
7. a kind of spacer grid of fuel assembly with angle plug-in unit as claimed in claim 3, it is characterised in that：It inserts at single angle
Part includes single pole (4) and the elastic arm (5) set on single pole (4) one end.
8. a kind of spacer grid of fuel assembly with angle plug-in unit as claimed in claim 7, it is characterised in that：In the single pole
(4) one end for being equipped with elastic arm (5) is equipped with lower slot, and grafting is set on not lattice cell (1) edged surface of diagonal relationship, single pole (4)
The other end and the lateral wall of lattice cell (1) are welded and fixed.
9. such as a kind of spacer grid of fuel assembly with angle plug-in unit of claim 4~8 any one of them, it is characterised in that：Institute
There are two support arms for the elastic arm (5) stated, and are divided into first support arm (6) and second support arm (7).
10. a kind of spacer grid of fuel assembly with angle plug-in unit as claimed in claim 9, it is characterised in that：Described first
Support arm (6) is connected with second support arm (7) one end, and the other end is at an angle of alpha to each other bending, α≤180 °.
11. a kind of spacer grid of fuel assembly with angle plug-in unit as claimed in claim 10, it is characterised in that：Described
One support arm (6) and second support arm (7) disjunct one end are respectively equipped with convex block (8), and one end of convex block (8) and fuel element are at line
Contact, the other end of convex block (8) are opposite with edged surface as positive stop end.
12. a kind of spacer grid of fuel assembly with angle plug-in unit as claimed in claim 11, it is characterised in that：The outer band
(9) height is identical as the height of lattice cell (1), is equipped with guide vane (10) in the top edge of outer band (9) and lower edge, prevents
Fuel assembly hooks mutually when assembly.
13. a kind of spacer grid of fuel assembly with angle plug-in unit as claimed in claim 12, it is characterised in that：The lattice cell
(1) connect two-by-two, fixed by way of spot welding, form the arrangement of N × N.
14. a kind of spacer grid of fuel assembly with angle plug-in unit as claimed in claim 13, it is characterised in that：Lattice cell is arranged
In a lattice cell (1) take out, the position of lattice cell (1) vacancy is as being oriented to tube passage (11) or instrument tube passage.
15. a kind of spacer grid of fuel assembly with angle plug-in unit as claimed in claim 14, it is characterised in that：The instrument
There are one tube passages, is located at the center that lattice cell (1) is arranged with N × N；Being oriented to tube passage (11) has several, with gauge pipe
Centered on channel, it is symmetrically arranged.
16. a kind of spacer grid of fuel assembly with angle plug-in unit as claimed in claim 15, it is characterised in that：Guide pipe is set to
It is oriented in tube passage (11), is welded and fixed with the barrel lateral surface of lattice cell (1).
17. a kind of spacer grid of fuel assembly with angle plug-in unit as claimed in claim 16, it is characterised in that：The guiding
Quantity, the position consistency of tube passage (11) and the guiding tube passage of upper tube socket.
18. a kind of spacer grid of fuel assembly with angle plug-in unit as claimed in claim 17, it is characterised in that：Gauge pipe is set to
In instrument tube passage, it is welded and fixed with the barrel lateral surface of lattice cell (1).
19. a kind of fuel assembly, including upper tube socket, annular fuel element, bottom nozzle, guide pipe, gauge pipe, it is characterised in that：
Further include such as claim 10~18 any one of them grid spacer.
20. a kind of fuel assembly as claimed in claim 19, 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 axially disposed successively；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 |
|---|---|---|---|
| CN201721772768.6U CN207731669U (en) | 2017-12-19 | 2017-12-19 | A kind of spacer grid of fuel assembly and fuel assembly with angle plug-in unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721772768.6U CN207731669U (en) | 2017-12-19 | 2017-12-19 | A kind of spacer grid of fuel assembly and fuel assembly with angle plug-in unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207731669U true CN207731669U (en) | 2018-08-14 |
Family
ID=63098858
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721772768.6U Active CN207731669U (en) | 2017-12-19 | 2017-12-19 | A kind of spacer grid of fuel assembly and fuel assembly with angle plug-in unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207731669U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109935368A (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 with angle plug-in unit |
-
2017
- 2017-12-19 CN CN201721772768.6U patent/CN207731669U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109935368A (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 with angle plug-in unit |
| CN109935368B (en) * | 2017-12-19 | 2024-05-14 | 中国原子能科学研究院 | Fuel assembly spacer grid with corner inserts and fuel assembly |
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