CN109935370A - A kind of spacer grid of fuel assembly and fuel assembly with plug-in unit - Google Patents
A kind of spacer grid of fuel assembly and fuel assembly with plug-in unit Download PDFInfo
- Publication number
- CN109935370A CN109935370A CN201711369546.4A CN201711369546A CN109935370A CN 109935370 A CN109935370 A CN 109935370A CN 201711369546 A CN201711369546 A CN 201711369546A CN 109935370 A CN109935370 A CN 109935370A
- Authority
- CN
- China
- Prior art keywords
- plug
- unit
- fuel assembly
- lattice cell
- spacer grid
- Prior art date
- 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.)
- Pending
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 103
- 125000006850 spacer group Chemical group 0.000 title claims abstract description 64
- 239000002826 coolant Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000003758 nuclear fuel Substances 0.000 description 2
- 238000005253 cladding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The present invention relates to fuel assembly technical fields, specifically disclose a kind of spacer grid of fuel assembly and fuel assembly with plug-in unit, and the grid spacer is rearranged two-by-two by lattice cell；The lattice cell is four sides cylinder, is respectively equipped with upper slot on four faces of lattice cell, for cooperating 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.Grid spacer of the present invention can be suitable for annular fuel element, provide located lateral to fuel element and generate certain effect of mixing to coolant.In addition, grid spacer of the present invention is clamped and supported to fuel element using plug-in unit, overall stiffness is significantly increased, and simplifies the processing program at spacer grid supporting position, reduces difficulty of processing.
Description
Technical field
The invention belongs to fuel assembly technical fields, and in particular to a kind of spacer grid of fuel assembly and fuel with plug-in unit
Component.
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,
Clamp fuel rod spring or it is just convex can relax, its corresponding chucking power can strongly reduce, and fuel rod can generally fall in bottom nozzle
On, under the mobilization of coolant, 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 such as spring, the space of rigid convex clamping piece has become ten
Divide narrow, this probability that fuel element is fallen at runtime on bottom nozzle 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 determines, to change grid spacer
Characteristic, such as the chucking power size that grid spacer is capable of providing need to change the shape of wherein nearly all mold, increase
Work load is added.
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 the present invention is to provide a kind of spacer grid of fuel assembly with plug-in unit, can clamp annular fuel member
Part, and include the fuel assembly of above-mentioned grid spacer.
Technical scheme is as follows:
A kind of spacer grid of fuel assembly with plug-in unit, the grid spacer are rearranged two-by-two by lattice cell；
The lattice cell is four sides cylinder, is respectively equipped with upper slot on four faces of lattice cell, for inserting with plug-in unit cooperation
It connects.
There are four types of the plug-in units, and respectively angle plug-in unit, side plug-in unit, channel card and intermediate plug-in unit, every kind of plug-in unit wrap
Include clamping part and plug division.
The clamping part is to lattice cell inner bulge.
The angle plug-in unit includes a clamping part and two plug divisions, and two of them plug division is orthogonal, clamping part
Between two plug divisions.
The side plug-in unit includes two clamping parts and three plug divisions, and at T-shaped, clamping part is set respectively for three plug divisions
Between every two plug division at position at right angle.
The channel card includes three clamping parts and four plug divisions, four plug division across, and clamping part is set
Between every two plug division.
The intermediate plug-in unit includes four clamping parts and four plug divisions, four plug division across, and clamping part is set
Between every two plug division.
The angle plug-in unit be set to arranged two-by-two by lattice cell on four angles of structure.
The side plug-in unit be set to arranged two-by-two by lattice cell on the four edges of structure.
The intermediate plug-in unit be set to arranged two-by-two by lattice cell at structure inside.
Lower slot is equipped on the top of the plug division, upper slot grafting with lattice cell, the side of plug division and lattice cell
Gap is equipped between side.
Lower slot is equipped on the top of the plug division, upper slot grafting with lattice cell, the side of plug division and lattice cell
Side connects.
The top of the plug division is set in the upper slot of lattice cell, between being equipped between the side of plug division and the side of lattice cell
Gap.
The top of the plug division is set in the upper slot of lattice cell, and the side of plug division connects with the side of lattice cell.
The lattice cell connects two-by-two, forms the arrangement of N × N.
The value range of the N is 3~17.
The value of N is one in 5,9,13,15.
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 channel card is set between the adjacent lattice cell of guide pipe channel circumference.
The instrument tube passage has one, 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 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.
It is equipped with outer band in the outside of lattice cell arrangement, the height of outer band and the height of lattice cell are identical.
It is equipped with guide vane in the top edge of outer band and lower edge, prevents fuel assembly mutual hook when assembly
It hangs.
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.
Remarkable result of the invention is:
(1) grid spacer of the present invention can be suitable for the fuel element of bigger outer diameter, first to fuel such as annular fuel element
Part provides located lateral and generates certain effect of mixing to coolant.
(2) common rod shaped fuel element can also be applied in grid spacer of the present invention, and can make coolant and fuel member
Part more fully contacts.
(3) grid spacer of the present invention is clamped and is supported to fuel element using plug-in unit, and overall stiffness significantly increases, and
The processing program for simplifying spacer grid supporting position, reduces difficulty of processing.
(4) it is equipped with gap between the plug-in unit plug division side and lattice cell side in the present invention, so that the clamping of clamping part is made
Firmly value range increases, and can adapt to the work requirements under different situations.
(5) grid spacer of the present invention can use dissimilar material welding when not same material to ask to avoid in lattice cell and plug-in unit
Topic.
(6) the grid spacers clamping fuel elements that fuel assembly of the present invention is axially arranged using multiple, to fuel element into
Row 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.
(7) fuel assembly of the present invention use fuel element lower end stationary structure, avoid hanging type fuel element by
To when long period irradiation, grid spacer chucking power reduces, and fuel element is caused to fall.
Detailed description of the invention
Fig. 1 is grid spacer axonometric schematic diagram；
Fig. 2 is grid spacer top view；
Fig. 3 is angle plug-in unit intention；
Fig. 4 is side plug-in unit schematic diagram；
Fig. 5 is intermediate plug-in unit schematic diagram.
In figure: 1. lattice cells；2. plug-in unit；3. clamping part；4. plug division；5. outer band；6. guide vane；7. being oriented to tube passage；
8. jiao plug-in unit；9. side plug-in unit；10. channel card；11. intermediate plug-in unit.
Specific embodiment
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Embodiment one
As shown in Figure 1, 2, a kind of spacer grid of fuel assembly with plug-in unit, is rearranged two-by-two by lattice cell 1；
The lattice cell 1 is four sides cylinder, is respectively equipped with upper slot on four faces of lattice cell 1, for cooperating with plug-in unit 2
Grafting.
As seen in figures 3-5, there are four types of the plug-in units 2, respectively angle plug-in unit 8, side plug-in unit 9, channel card 10 and centre
Plug-in unit 11, every kind of plug-in unit 2 include clamping part 3 and plug division 4.The clamping part 3 is to 1 inner bulge of lattice cell.
The angle plug-in unit 8 includes a clamping part 3 and two plug divisions 4, and two of them plug division 4 is orthogonal, folder
Portion 3 is held between two plug divisions 4.The angle plug-in unit 8 be set to arranged two-by-two by lattice cell 1 on four angles of structure.
The side plug-in unit 9 includes two clamping parts 3 and three plug divisions 4, and three plug divisions 4 are at T-shaped, clamping part 3
It is respectively arranged between every two plug division 4 at position at right angle.The side plug-in unit 9 be set to arrange two-by-two by lattice cell 1 at
On the four edges of structure.
The channel card 10 includes three clamping parts 3 and four plug divisions 4, four 4 across of plug division, clamping
Portion 3 is set between every two plug division 4.The channel card 10 is set between the adjacent lattice cell 1 of guiding tube passage 7.
The intermediate plug-in unit 11 includes four clamping parts 3 and four plug divisions 4, four 4 across of plug division, clamping
Portion 3 is set between every two plug division 4.The intermediate plug-in unit 11 be set to arranged two-by-two by lattice cell 1 at structure inside.
The top of the plug division 4 is set in the upper slot of lattice cell 1, is set between the side of plug division 4 and the side of lattice cell 1
There is gap.
The lattice cell 1 connects two-by-two, forms the arrangement of N × N, and the value range of N is 3~17, be preferably 5,9,13,
One in 15.
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 7 or gauge pipe
Road；
The channel card 10 is set between lattice cell 1 adjacent around guiding tube passage 7.
The instrument tube passage has one, is located at the center that lattice cell 1 is arranged with N × N；If guiding tube passage 7 has
It dry, centered on instrument tube passage, is symmetrically arranged.
Guide pipe is set in guiding tube passage 7, is welded and fixed with the barrel lateral surface of lattice cell 1.
Quantity, the position consistency of the guiding tube passage of the guiding tube passage 7 and upper tube socket.
Gauge pipe is set in instrument tube passage, is welded and fixed with the barrel lateral surface of lattice cell 1.
It is equipped with outer band 5 in the outside that lattice cell 1 arranges, the height of outer band 5 is identical as the height of lattice cell 1.In outer band 5
Top edge and lower edge be equipped with guide vane 6, prevent fuel assembly assembly when hook mutually.
Embodiment two
The present embodiment and embodiment one the difference is that: the top of the plug division 4 is set to the upper slot of lattice cell 1
Interior, the side of plug division 4 connects with the side of lattice cell 1.
Embodiment three
The present embodiment and embodiment one the difference is that: lower slot is equipped on the top of the plug division 4, with lattice cell
1 upper slot grafting is equipped with gap between the side of plug division 4 and the side of lattice cell 1.
Example IV
The present embodiment and embodiment one the difference is that: lower slot is equipped on the top of the plug division 4, with lattice cell
1 upper slot grafting, the side of plug division 4 connect with the side of lattice cell 1.
Fuel assembly for nuclear reactor of the present invention, including upper tube socket, annular fuel element, bottom nozzle, guide pipe, gauge pipe,
And grid spacer described in 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 (26)
1. a kind of spacer grid of fuel assembly with plug-in unit, it is characterised in that: the grid spacer is arranged two-by-two by lattice cell (1)
Composition；
The lattice cell (1) is four sides cylinder, is respectively equipped with upper slot on four faces of lattice cell (1), for matching with plug-in unit (2)
Close grafting.
2. a kind of spacer grid of fuel assembly with plug-in unit as described in claim 1, it is characterised in that: the plug-in unit (2)
There are four types of, respectively angle plug-in unit (8), side plug-in unit (9), channel card (10) and intermediate plug-in unit (11), every kind of plug-in unit (2) include
Clamping part (3) and plug division (4).
3. a kind of spacer grid of fuel assembly with plug-in unit as claimed in claim 2, it is characterised in that: the clamping part
(3) to lattice cell (1) inner bulge.
4. a kind of spacer grid of fuel assembly with plug-in unit as claimed in claim 3, it is characterised in that: the angle plug-in unit
It (8) include a clamping part (3) and two plug divisions (4), two of them plug division (4) are orthogonal, and clamping part (3) is set to two
Between a plug division (4).
5. a kind of spacer grid of fuel assembly with plug-in unit as claimed in claim 3, it is characterised in that: the side plug-in unit
It (9) include two clamping parts (3) and three plug divisions (4), at T-shaped, clamping part (3) is respectively arranged on often three plug divisions (4)
Between two plug divisions (4) at position at right angle.
6. a kind of spacer grid of fuel assembly with plug-in unit as claimed in claim 3, it is characterised in that: the channel card
It (10) include three clamping parts (3) and four plug divisions (4), four plug division (4) across, clamping part (3) is set on every two
Between a plug division (4).
7. a kind of spacer grid of fuel assembly with plug-in unit as claimed in claim 3, it is characterised in that: the intermediate plug-in unit
It (11) include four clamping parts (3) and four plug divisions (4), four plug division (4) across, clamping part (3) is set on every two
Between a plug division (4).
8. a kind of spacer grid of fuel assembly with plug-in unit as claimed in claim 4, it is characterised in that: the angle plug-in unit
(8) be set to arranged two-by-two by lattice cell (1) on four angles of structure.
9. a kind of spacer grid of fuel assembly with plug-in unit as claimed in claim 5, it is characterised in that: the side plug-in unit
(9) be set to arranged two-by-two by lattice cell (1) on the four edges of structure.
10. a kind of spacer grid of fuel assembly with plug-in unit as claimed in claim 6, it is characterised in that: interleave in described
Part (11) be set to arranged two-by-two by lattice cell (1) at structure inside.
11. a kind of spacer grid of fuel assembly with plug-in unit as claimed in claim 3, it is characterised in that: in the plug division
(4) top is equipped with lower slot, the upper slot grafting with lattice cell (1), between the side of plug division (4) and the side of lattice cell (1)
Equipped with gap.
12. a kind of spacer grid of fuel assembly with plug-in unit as claimed in claim 3, it is characterised in that: in the plug division
(4) top is equipped with lower slot, and the upper slot grafting with lattice cell (1), the side of plug division (4) connects with the side of lattice cell (1).
13. a kind of spacer grid of fuel assembly with plug-in unit as claimed in claim 3, it is characterised in that: the plug division (4)
Top be set in the upper slot of lattice cell (1), equipped with gap between the side of plug division (4) and the side of lattice cell (1).
14. a kind of spacer grid of fuel assembly with plug-in unit as claimed in claim 3, it is characterised in that: the plug division (4)
Top be set to lattice cell (1) upper slot in, the side of plug division (4) connects with the side of lattice cell (1).
15. a kind of spacer grid of fuel assembly with plug-in unit as described in any one of claim 1~14, it is characterised in that:
The lattice cell (1) connects two-by-two, forms the arrangement of N × N.
16. a kind of spacer grid of fuel assembly with plug-in unit as claimed in claim 15, it is characterised in that: the value of the N
Range is 3~17.
17. a kind of spacer grid of fuel assembly with plug-in unit as claimed in claim 16, it is characterised in that: the value of N is 5,
9, one in 13,15.
18. a kind of spacer grid of fuel assembly with plug-in unit as claimed in claim 15, it is characterised in that: in arranging lattice cell
A lattice cell (1) take out, the position of lattice cell (1) vacancy is as guiding tube passage (7) or instrument tube passage；
The channel card (10) is set between lattice cell (1) adjacent around guiding tube passage (7).
19. a kind of spacer grid of fuel assembly with plug-in unit as claimed in claim 18, it is characterised in that: the gauge pipe
Channel has one, is located at the center that lattice cell (1) is arranged with N × N；Guiding tube passage (7) has several, with instrument tube passage
Centered on, it is symmetrically arranged.
20. a kind of spacer grid of fuel assembly as claimed in claim 19, it is characterised in that: guide pipe is set to guiding tube passage
(7) it in, is welded and fixed with the barrel lateral surface of lattice cell (1).
21. a kind of spacer grid of fuel assembly as claimed in claim 20, it is characterised in that: the guiding tube passage (7)
With quantity, the position consistency of the guiding tube passage of upper tube socket.
22. a kind of spacer grid of fuel assembly as claimed in claim 21, it is characterised in that: gauge pipe is set to instrument tube passage
It is interior, it is welded and fixed with the barrel lateral surface of lattice cell (1).
23. a kind of spacer grid of fuel assembly with plug-in unit as claimed in claim 22, it is characterised in that: arranged in lattice cell (1)
The outside of column is equipped with outer band (5), and the height of outer band (5) is identical as the height of lattice cell (1).
24. a kind of spacer grid of fuel assembly as claimed in claim 23, it is characterised in that: in the top edge of outer band (5)
Guide vane (6) are equipped with lower edge, prevent fuel assembly from hooking mutually when assembly.
25. 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 16~24.
26. a kind of fuel assembly as claimed in claim 25, 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 |
|---|---|---|---|
| CN201711369546.4A CN109935370A (en) | 2017-12-19 | 2017-12-19 | A kind of spacer grid of fuel assembly and fuel assembly with plug-in unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711369546.4A CN109935370A (en) | 2017-12-19 | 2017-12-19 | A kind of spacer grid of fuel assembly and fuel assembly with plug-in unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109935370A true CN109935370A (en) | 2019-06-25 |
Family
ID=66983121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711369546.4A Pending CN109935370A (en) | 2017-12-19 | 2017-12-19 | A kind of spacer grid of fuel assembly and fuel assembly with plug-in unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109935370A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110828000A (en) * | 2019-10-18 | 2020-02-21 | 广东核电合营有限公司 | Foreign matter prevention grid, lower pipe seat assembly and fuel assembly |
| CN115171923A (en) * | 2022-06-24 | 2022-10-11 | 上海核工程研究设计院有限公司 | Grid structure of fuel assembly and positioning grillwork |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110828000A (en) * | 2019-10-18 | 2020-02-21 | 广东核电合营有限公司 | Foreign matter prevention grid, lower pipe seat assembly and fuel assembly |
| CN110828000B (en) * | 2019-10-18 | 2021-11-09 | 广东核电合营有限公司 | Foreign matter prevention grid, lower pipe seat assembly and fuel assembly |
| CN115171923A (en) * | 2022-06-24 | 2022-10-11 | 上海核工程研究设计院有限公司 | Grid structure of fuel assembly and positioning grillwork |
| CN115171923B (en) * | 2022-06-24 | 2024-06-07 | 上海核工程研究设计院股份有限公司 | Fuel assembly grid structure and positioning grid |
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