CN109935362A - A kind of bottom device of fuel assembly and its bottom nozzle and fuel assembly - Google Patents
A kind of bottom device of fuel assembly and its bottom nozzle and fuel assembly Download PDFInfo
- Publication number
- CN109935362A CN109935362A CN201711369548.3A CN201711369548A CN109935362A CN 109935362 A CN109935362 A CN 109935362A CN 201711369548 A CN201711369548 A CN 201711369548A CN 109935362 A CN109935362 A CN 109935362A
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- foreign matter
- bottom nozzle
- fuel assembly
- hole
- fuel
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- 239000000446 fuel Substances 0.000 title claims abstract description 152
- 125000006850 spacer group Chemical group 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- 238000001816 cooling Methods 0.000 claims description 13
- 238000005259 measurement Methods 0.000 claims description 7
- 239000011148 porous material Substances 0.000 claims description 7
- 239000000498 cooling water Substances 0.000 claims description 5
- 230000000712 assembly Effects 0.000 claims description 2
- 238000000429 assembly Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims description 2
- 230000004907 flux Effects 0.000 abstract 1
- 239000002826 coolant Substances 0.000 description 11
- 238000013461 design Methods 0.000 description 11
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 210000003205 muscle Anatomy 0.000 description 2
- 239000003758 nuclear fuel Substances 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring 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)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention belongs to reactor engineering technical fields, and in particular to the bottom device of a kind of fuel assembly and its bottom nozzle and fuel assembly.Include: bottom nozzle framework, the supporting leg of bottom nozzle framework lower part is set and several cross parallels in length and breadth are arranged in the isometrical through-hole of bottom nozzle framework upper surface, neutron flux pipe lower end consent and guide pipe lower end consent；The isometrical through-hole is circle.A kind of bottom device, comprising: bottom nozzle and anti-foreign matter component connected to it, the bottom nozzle are bottom nozzle as described above.A kind of fuel assembly, comprising: upper tube socket, fuel rod, grid spacer, guide pipe, gauge pipe and bottom device；Fuel rod, guide pipe and gauge pipe are inserted in grid spacer；Grid spacer shares multiple, sets gradually along axial direction；The upper end of guide pipe and gauge pipe is fixedly connected with upper tube socket, and lower end is fixedly connected with bottom device；The bottom device further include: bottom nozzle and anti-foreign matter component；Bottom nozzle is described in any item bottom nozzles as above.
Description
Technical field
The invention belongs to reactor engineering technical fields, and in particular to a kind of fuel assembly and its bottom nozzle and fuel assembly
Bottom device.
Background technique
Usual nuclear fuel is designed as solid cylindrical, is made of upper and lower end plug, pellet, holddown spring and involucrum, cold
But agent is flowed through outside involucrum, is cooled down to fuel rod.For annular fuel by inside and outside two layers of involucrum, coolant can be simultaneously from inside and outside two
Take away the heat of fuel sending in side.
Fuel assembly bottom device is located at fuel assembly bottom, including bottom nozzle and anti-foreign matter component, is arranged on bottom nozzle
Have coolant flow water hole, for cooling water circulation and play the role of assignment of traffic to coolant, anti-foreign matter component can intercept
The foreign matter that may contain in coolant prevents from causing to damage to fuel rod, and the recirculation hole of the bottom nozzle in existing fuel assembly is set
Pressure drop cannot be effectively reduced if for annular fuel component in meter.
In addition, existing PWR fuel assembly design in, fuel rod generally using grid spacer clamp it is hanging by the way of.
Bottom nozzle supports entire fuel assembly by guide pipe, and general anti-foreign matter component is in bottom nozzle upper surface.In reactor operation
In the hand end of term, since the chucking power of the spring of the effect clamping fuel rod of irradiation can strongly reduce, fuel rod can generally fall in down tube
On seat, under the mobilization of coolant, fuel rod may upper and lower play, this will lead to the risk of fuel rod breakage.
Consider that problem above, design consider for fuel rod to be fixed on inside bottom nozzle, grid spacer is not providing fuel rod
The chucking power of support only provides located lateral.If annular fuel rod is fixed on inside bottom nozzle, according to existing anti-foreign matter
Component design, only there is the function of anti-foreign matter to the outer flow passage of fuel rod, and device of the fuel rod inner flow passage without anti-foreign matter, so
Anti- foreign matter device need to be redesigned.
Related document, which discloses reactor fuel assemblies bottom nozzle and is all based on fuel rod, in currently available technology vacantly exists
The fuel assembly on upper tube socket top designs, and anti-foreign matter component is not suitable for the design of annular fuel component yet.Therefore research and development one
Kind novel bottom device and bottom nozzle.
Summary of the invention
The purpose of the present invention is to provide a kind of fuel assembly and its bottom devices of bottom nozzle and fuel assembly, solve existing
There is the technical problem that fuel assembly bottom nozzle is insufficient in fuel assembly application in technology.
The technical scheme is that
A kind of bottom nozzle of fuel assembly, comprising: the supporting leg of bottom nozzle framework lower part and several is arranged in bottom nozzle framework
Cross parallel is arranged in end plug under the isometrical through-hole, neutron measurement pore and guide pipe of bottom nozzle framework upper surface in length and breadth
Hole；The isometrical through-hole is circle.
Isometrical through-hole as described above includes through-hole and mainstream water hole C, the mainstream water hole C be uniformly arranged on adjacent through-holes it
Between；The mainstream water hole aperture C is less than through-hole aperture.,
There are also rectangular configuration through-holes for setting between adjacent through-holes as described above.
Rectangular configuration through-hole as described above includes: mainstream water hole A and mainstream water hole B；The mainstream water hole A is uniformly arranged
In the rectangular centre position that every four adjacent through-holes surround.
Mainstream water hole B as described above is arranged in neutron measurement pore and guide pipe lower end consent surrounding.
The ratio between the cross-sectional area of mainstream water hole A and mainstream water hole B as described above is 1~1.4.
Through-hole as described above is for installing fuel rod or/and circulation cooling water.
The fuel rod installed as described above is annular fuel rod.
The bore size of through-hole and guide pipe lower end consent as described above and arrangement and fuel rod and guiding in fuel assembly
Pipe matches, and the multiple for four can be set as needed in the setting of guide pipe quantity.
Through-hole as described above and guide pipe lower end consent inner wall upper surface are provided with chamfering structure.
The chamfer angle α range as described above is 10 °~30 °.
A kind of bottom device, comprising: bottom nozzle and anti-foreign matter component connected to it, the bottom nozzle is as described above
Bottom nozzle.
Anti- foreign matter component as described above includes: anti-foreign matter screen frame body and the anti-foreign matter net that connect with anti-foreign matter screen frame body, institute
It states anti-foreign matter and offers multiple filter elements on the net；The anti-foreign matter framework is integrally square structure, the anti-foreign matter framework
Four angle settings are fluted.
Anti- foreign matter component is arranged inside the bottom nozzle as described above, the anti-foreign matter component and fuel assembly lower end
Distance is 1.3mm；90 ° are rolled over upwards in four side of edge part of the anti-foreign matter screen frame body.
Anti- foreign matter net as described above is jointly mounted to anti-foreign matter screen frame body lower surface, the edge part surrounding of the anti-foreign matter net
It is bonded with anti-foreign matter screen frame body edge part.
Four angles of anti-foreign matter net as described above are also equipped with groove and match with the groove size in anti-foreign matter framework.
Filter hole cell orifice as described above is rectangular, round or regular hexagon structure.
A kind of fuel assembly, comprising: upper tube socket, fuel rod, grid spacer, guide pipe, gauge pipe and bottom device；Fuel
Stick, guide pipe and gauge pipe are inserted in grid spacer；Grid spacer shares multiple, sets gradually along axial direction；Guide pipe and instrument
The upper end of table pipe is fixedly connected with upper tube socket, and lower end is fixedly connected with bottom device；The bottom device further include: bottom nozzle and
Anti- foreign matter component；The bottom nozzle is described in any item bottom nozzles as above.
The bottom device is described in any item bottom devices as above；The fuel rod is two-sided cooling annular fuel
Stick.
Fuel assembly as described above further includes the more two-sided cooling annular fuel rods for having wrapping wire, these have wrapping wire
Two-sided cooling annular fuel rod is placed in coaming plate or fuel cassette.
The beneficial effects of the present invention are:
The invention proposes a kind of fuel assembly and its bottom devices of bottom nozzle and fuel assembly, in existing fuel stack
Fuel rod insertion is fixed in bottom nozzle in part structure design basis, grid spacer no longer provides the clamping of fuel rod support
Power only provides located lateral function.
The present invention has the function of that flow resistance is low and has relatively strong anti-foreign matter, and is capable of fixing fuel rod, is meeting above functions
While, fuel support assembly function and unaffected with the interface of core structure.
The present invention provides a kind of circulation area is big, manufacture difficulty is small, the big fuel stack of manufacturing process simple structure intensity
The bottom device structure of part, the circulating face of the bottom nozzle of the bottom nozzle circulation area that the present invention designs foreign matter net more anti-than existing band
Product is big by 0.6%, effectively reduces the pressure drop of bottom device of the present invention.Between bottom nozzle stick the advantages of round metering orifice: can be substantially
Degree increases the flow of narrowest position between fuel stick and stick, effectively improves the heat transfer characteristic at this, promotes fuel safety.
This design is reduced and stirs and make muddy design to screen work and want so that cooling water flow when by bottom nozzle is just reasonably distributed
It asks, makes the reduction of component whole design difficulty.
Two-sided cooling annular fuel rod of the present invention with wrapping wire, the wrapping wire being wound on outside annular fuel rod,
Have the function of obviously increasing coolant lateral flow, enhances fuel rod to coolant heat-transfer effect, pass through coolant flow-disturbing band
More passage of heat heats are walked, fuel rod temperature is reduced, improve DNBR, enhance fuel rod safety.
Two-sided cooling annular fuel rod of the present invention with wrapping wire, can two-sided cooling, i.e., it is inside and outside can have it is cold
But agent is circulated, and is cooled down to fuel rod.Compared with existing PWR Fuel stick structure, fuel heat transfer area increases 50%, combustion
Material pellet maximum temperature reduces 1000 DEG C, and linear power density increases 20%~50%, and flow resistance reduces 20%.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the fuel assembly in some embodiments of the invention；
Fig. 2 is bottom nozzle top view of the present invention；
Fig. 3 is bottom device structural schematic diagram of the present invention；
Fig. 4 is the through-hole partial enlarged view of bottom nozzle of the present invention；
Fig. 5 is the fuel assembly schematic diagram of the present invention with wrapping wire.
Wherein: 1- bottom device, 2- fuel rod, 3- grid spacer, the upper tube socket of 4-, 5- wrapping wire, 11- bottom nozzle framework, 12-
Supporting leg, the anti-foreign matter screen frame body of 13-, the anti-foreign matter net of 14-, 15- through-hole, 16- neutron measurement pore；17- guide pipe lower end consent；
18- mainstream water hole A, 19- mainstream water hole B, 20- mainstream water hole C.
Specific embodiment
The technology of the present invention is described further in conjunction with specific embodiments below:
As shown in Fig. 1 to 5, the bottom device of a kind of fuel assembly and its bottom nozzle and fuel assembly,
A kind of bottom nozzle of fuel assembly, comprising: bottom nozzle framework 11, the supporting leg 12 that 11 lower part of bottom nozzle framework is set
The isometrical through-hole, neutron measurement pore 16 and guiding of 11 upper surface of bottom nozzle framework are arranged in several cross parallels in length and breadth
Pipe lower end consent 17；The isometrical through-hole is circle.
The isometrical through-hole includes through-hole 15 and mainstream water hole C20, and the mainstream water hole C20 is uniformly arranged on adjacent through-holes
Between 15；The mainstream water hole aperture C20 is less than 15 aperture of through-hole.,
There are also rectangular configuration through-holes for setting between the adjacent through-holes 15.
The rectangular configuration through-hole includes: mainstream water hole A18 and mainstream water hole B19；The mainstream water hole A18 is uniformly set
It sets in the rectangular centre position that every four adjacent through-holes 15 surround.
The mainstream water hole B19 is arranged in 17 surrounding of neutron measurement pore 16 and guide pipe lower end consent.
The ratio between cross-sectional area of the mainstream water hole A18 and mainstream water hole B19 is 1~1.4.The mainstream water hole A18 with
The even aperture distribution of mainstream water hole B19 and aperture has biggish circulation area, to prevent bottom nozzle from having biggish pressure drop.
The through-hole 15 is for installing fuel rod or/and circulation cooling water.
The fuel rod of the installation is annular fuel rod.
The bore size and arrangement of the through-hole 15 and guide pipe lower end consent 17 and fuel rod and guiding in fuel assembly
Pipe matches, and the multiple for four can be set as needed in the setting of guide pipe quantity.
The through-hole 15 and 17 inner wall upper surface of guide pipe lower end consent are provided with chamfering structure, for inserting in fuel rod
It is oriented to fixed and centering from when entering bottom nozzle, and blocking fuel rod with the synergy of bottom nozzle lower end surface prevents it from running
When pop up.
The chamfer angle α range is 10 °~30 °.
A kind of bottom device, comprising: bottom nozzle and anti-foreign matter component connected to it, the bottom nozzle is as described above
Bottom nozzle.
The anti-foreign matter component includes: anti-foreign matter screen frame body 13 and the anti-foreign matter net 14 that connect with anti-foreign matter screen frame body 13,
Multiple filter elements are offered on the anti-foreign matter net 14；The whole structure that is square of the anti-foreign matter framework 13, the anti-foreign matter
Four angles setting of framework 13 is fluted.
The anti-foreign matter component is arranged inside the bottom nozzle, and the anti-foreign matter component is at a distance from fuel assembly lower end
For 15.3mm；90 ° are rolled over upwards in four side of edge part of the anti-foreign matter screen frame body 13.
The anti-foreign matter net is jointly mounted to anti-13 lower surface of foreign matter screen frame body, the edge part surrounding of the anti-foreign matter net 14
It is bonded with anti-13 edge part of foreign matter screen frame body.
Four angles of the anti-foreign matter net 14 are also equipped with groove and match with the groove size in anti-foreign matter framework 13.
The filter hole cell orifice is rectangular, round or regular hexagon structure.
A kind of fuel assembly, comprising: upper tube socket 4, fuel rod 2, grid spacer 3, guide pipe, gauge pipe and bottom device 1；
Fuel rod 2, guide pipe and gauge pipe are inserted in grid spacer 3；This structure constitute fuel assembly frame structure, be used to support and
Annular fuel rod is fettered, fuel rod is enable to be mounted on the suitable position of reactor core, and guarantees combustion in transporting and hoisting and normal operation
Charge bar does not move.
Grid spacer 3 shares multiple, sets gradually along axial direction；The upper end of guide pipe and gauge pipe and the fixed company of upper tube socket 4
It connects, lower end is fixedly connected with bottom device 4；The bottom device further include: bottom nozzle and anti-foreign matter component；The bottom nozzle is
Described in any item bottom nozzles as above.
The bottom device 1 is described in any item bottom devices as above；The fuel rod 2 is two-sided cooling annular fuel
Stick.
The fuel assembly further includes the more two-sided cooling annular fuel rods for having wrapping wire 5, these are double with wrapping wire 5
The cooling annular fuel rod in face is placed in coaming plate or fuel cassette.
In some embodiments, fuel assembly is arranged by 3 located lateral of grid spacer, and 2 lower part of fuel rod is fixed
It is fastened in bottom nozzle, therefore grid spacer 3 is not required to provide chucking power, simplifies the structure of grid spacer 3, reduces positioning
The design and manufacture difficulty of screen work 3.
The generally square arrangement of fuel rod 2 described in some embodiments, which includes eight guide pipes and an instrument
Pipe；The fuel rod 2 is two layers of containment structure inside and outside annular hollow；The fuel assembly uses fuel rod for inside and outside two-sided cooling
Annular fuel rod, it is inside and outside to have coolant circulation, fuel rod 2 is cooled down.
It is provided with discharge orifice on upper tube socket 4 in some embodiments, coolant can be made to circulate；Upper tube socket 4 is hung for fuel assembly
Dress in container inner support when transport, and is connected with skeleton screw and guiding pipe connected pipe, and holddown spring is arranged at upper tube socket top,
Cooperate the compression for realizing fuel assembly in heap with reactor core top grating, and fuel assembly can be prevented in heap in-core play.
Skeleton screw described in some embodiments and guiding pipe connected pipe are used to connect tube socket and guiding tube assembly, and
Skeleton screw, which has structure that can cooperate with upper tube socket, makes it prevent from loosening.Guiding tube assembly is used to support the entire component of connection, upper end
It is connect by skeleton screw and guiding pipe connected pipe with upper tube socket line, centre is directly connected with grid spacer 3, and lower part passes through bone
It is connected under frame shaft shoulder screw and bottom nozzle.The skeleton shaft shoulder screw has structure for connecting bottom nozzle and guiding tube assembly
Make it that can prevent from loosening with bottom nozzle cooperation.
Grid spacer 3 described in some embodiments makes annular fuel rod in annular fuel group for clamping annular fuel rod
It is positioned in part, and can prevent annular fuel rod from axially and radially moving, grid spacer 3 is connected directly with guiding tube assembly.
Supporting leg 12 described in some embodiments is four, is located at the quadrangle of 11 lower end of bottom nozzle framework, wherein
One group of diagonal 12 lower end of supporting leg is provided with positioning slightly hole, and the bayonet fittings in positioning slightly hole and reactor core lower grid plate are used to support fixation
Fuel assembly realizes positioning of the fuel assembly in heap, reduces 2 Flow vibration of fuel rod, reduces the abrasion of fuel rod 2, into
And the damaged risk of fuel rod 2 is reduced, and 2 lower end of fuel rod is fixed in bottom nozzle, and the previous fuel assembly longevity will not occur
The phenomenon that end of term fuel rod falls, increases the safety of fuel assembly.
The surrounding side of bottom nozzle is provided with side plate in some embodiments, and location hole, the anti-foreign matter are provided on side plate
Component is fixed at bottom nozzle lower part by location hole, is conducive to the distribution of outer flow passage flow in balance fuel stick 2, meanwhile,
Anti- foreign matter component is placed on bottom nozzle lower part, and there are certain distances with 2 lower end of fuel rod, there is coolant flowing, foreign matter in this space
It will not accumulate in discharge orifice, can prevent discharge orifice from blocking.
Anti- foreign matter component is square structure in some embodiments, comprising: anti-foreign matter net 14 and anti-foreign matter screen frame body 13, institute
The structure for stating anti-foreign matter screen frame body 13 may be designed to various shapes, such as: it is trapezoidal, and there is sufficiently large intensity, it can bear cold
But agent shock loading.
Anti- foreign matter screen frame body 13 is formed by slab overall processing in some embodiments, thickness 3mm~8mm.The anti-foreign matter
The anti-foreign matter screen frame body muscle that several parallel intervals are arranged in framework is provided on screen frame body 13, anti-foreign matter screen frame body muscle is provided with
Threaded hole.Anti- foreign matter net 14 is formed by thin plate overall processing, thickness 0.8mm~3mm, the filter hole unit shape of anti-foreign matter net 14
Shape may be configured as rectangular, round and regular hexagon etc., and the side length of filter hole unit may be configured as 0.15~0.35mm.
The present invention is explained in detail above in conjunction with embodiment, but the present invention is not limited to above-described embodiments, at this
Field those of ordinary skill within the scope of knowledge, can also make various changes without departing from the purpose of the present invention
Change.
Claims (20)
1. a kind of bottom nozzle of fuel assembly, comprising: bottom nozzle framework (11), setting bottom nozzle framework (11) lower part supporting leg
(12) and several cross parallels in length and breadth are arranged in isometrical through-hole, the neutron measurement pore of bottom nozzle framework (11) upper surface
(16) and guide pipe lower end consent (17)；It is characterized in that, the isometrical through-hole is circle.
2. a kind of bottom nozzle of fuel assembly according to claim 1, it is characterised in that: the isometrical through-hole includes several
Through-hole (15) and several mainstream water hole C (20), the mainstream water hole C (20) are uniformly arranged between adjacent through-holes (15)；It is described
Mainstream water hole (20) aperture C is less than through-hole (15) aperture.
3. a kind of bottom nozzle of fuel assembly according to claim 1, it is characterised in that: the adjacent through-holes (151) it
Between setting there are also rectangular configuration through-hole.
4. a kind of bottom nozzle of fuel assembly according to claim 3, it is characterised in that: the rectangular configuration through-hole packet
It includes: mainstream water hole A (18) and mainstream water hole B (19)；The mainstream water hole A (18) is uniformly arranged on every four adjacent through-holes (15)
The rectangular centre position surrounded.
5. a kind of bottom nozzle of fuel assembly according to claim 4, it is characterised in that: the mainstream water hole B (19) sets
It sets in neutron measurement pore (16) and guide pipe lower end consent (17) surrounding.
6. a kind of bottom nozzle of fuel assembly according to claim 4, it is characterised in that: the mainstream water hole A (18) with
The ratio between cross-sectional area of mainstream water hole B (19) is 1~1.4.
7. a kind of bottom nozzle of fuel assembly according to claim 1, it is characterised in that: the through-hole (151) is for pacifying
Charge stick or/and circulation cooling water.
8. a kind of bottom nozzle of fuel assembly according to claim 7, it is characterised in that: the fuel rod of the installation is ring
Shape fuel rod.
9. a kind of bottom nozzle of fuel assembly according to claim 7, it is characterised in that: the through-hole (15) and guide pipe
The bore size of lower end consent (17) and arrangement match with fuel rod in fuel assembly and guide pipe, and the setting of guide pipe quantity can
The multiple for four is set as needed.
10. a kind of bottom nozzle of fuel assembly according to claim 7, it is characterised in that: the through-hole (15) and guiding
Pipe lower end consent (17) inner wall upper surface is provided with chamfering structure.
11. a kind of bottom nozzle of fuel assembly according to claim 10, it is characterised in that: the chamfer angle α
Range is 10 °~30 °.
12. a kind of bottom device, comprising: bottom nozzle and anti-foreign matter component connected to it, it is characterised in that: the bottom nozzle is
The described in any item bottom nozzles of claim 1-11.
13. a kind of bottom device according to claim 12, it is characterised in that: the anti-foreign matter component includes: anti-foreign matter
The anti-foreign matter net (14) of screen frame body (13) Ji Yufang foreign matter screen frame body (13) connection, offers on the anti-foreign matter net (14) multiple
Filter element；The structure it is characterized in that, the anti-foreign matter framework (13) is integrally square, four of the anti-foreign matter framework (13)
Angle setting is fluted.
14. a kind of bottom device according to claim 12, it is characterised in that: the anti-foreign matter component is arranged under described
Inside tube socket, the anti-foreign matter component is 15.3mm at a distance from fuel assembly lower end；The side of the anti-foreign matter screen frame body (13)
90 ° are rolled over upwards in four side of edge.
15. a kind of bottom device according to claim 12, it is characterised in that: the anti-foreign matter net is jointly mounted to prevent different
Object screen frame body (13) lower surface, the edge part surrounding of the anti-foreign matter net (14) are bonded with anti-foreign matter screen frame body (13) edge part.
16. a kind of bottom device according to claim 12, it is characterised in that: four angles of the anti-foreign matter net (14)
The fluted groove size on anti-foreign matter framework (13) is arranged to match.
17. a kind of bottom device according to claim 12, it is characterised in that: the filter hole cell orifice is rectangular, circle
Shape or regular hexagon structure.
18. a kind of fuel assembly, comprising: upper tube socket (4), fuel rod (2), grid spacer (3), guide pipe, gauge pipe and bottom
Device (1)；Fuel rod (2), guide pipe and gauge pipe are inserted in grid spacer (3)；Grid spacer (3) share it is multiple, along axis
To setting gradually；The upper end of guide pipe and gauge pipe is fixedly connected with upper tube socket (4), and lower end is fixedly connected with bottom device (4)；
The bottom device further include: bottom nozzle and anti-foreign matter component；It is characterized by: the bottom nozzle is that claim 1-11 is any
Bottom nozzle described in.
19. a kind of fuel assembly according to claim 18, it is characterised in that: the bottom device (1) is claim
The described in any item bottom devices of 12-17；The fuel rod (2) is two-sided cooling annular fuel rod.
20. 8 or 19 described in any item fuel assemblies according to claim 1, it is characterised in that: the fuel assembly further includes more
Root has the two-sided cooling annular fuel rod of wrapping wire (5), these two-sided cooling annular fuel rods with wrapping wire (5), which are placed in, to be enclosed
In plate or fuel cassette.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711369548.3A CN109935362B (en) | 2017-12-19 | 2017-12-19 | Fuel assembly, lower tube seat thereof and bottom device of fuel assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711369548.3A CN109935362B (en) | 2017-12-19 | 2017-12-19 | Fuel assembly, lower tube seat thereof and bottom device of fuel assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109935362A true CN109935362A (en) | 2019-06-25 |
| CN109935362B CN109935362B (en) | 2024-05-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711369548.3A Active CN109935362B (en) | 2017-12-19 | 2017-12-19 | Fuel assembly, lower tube seat thereof and bottom device of fuel assembly |
Country Status (1)
| Country | Link |
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| CN (1) | CN109935362B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109935351A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | A kind of fuel assembly and its bottom nozzle and bottom device |
| CN109935363A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | Fuel assembly and its bottom device and bottom nozzle applied to bottom device |
| WO2024125081A1 (en) * | 2022-12-12 | 2024-06-20 | 中广核研究院有限公司 | Nuclear fuel assembly bottom nozzle comprising constraint anti-foreign matter plate |
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| CN208767029U (en) * | 2017-12-19 | 2019-04-19 | 中国原子能科学研究院 | A kind of fuel assembly and its bottom nozzle and bottom device |
| CN208767031U (en) * | 2017-12-19 | 2019-04-19 | 中国原子能科学研究院 | Fuel assembly and its bottom device and bottom nozzle applied to bottom device |
| CN109935351A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | A kind of fuel assembly and its bottom nozzle and bottom device |
| CN109935363A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | Fuel assembly and its bottom device and bottom nozzle applied to bottom device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109935351A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | A kind of fuel assembly and its bottom nozzle and bottom device |
| CN109935363A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | Fuel assembly and its bottom device and bottom nozzle applied to bottom device |
| CN109935363B (en) * | 2017-12-19 | 2024-05-10 | 中国原子能科学研究院 | Fuel assembly and bottom device thereof and bottom tube seat applied to bottom device |
| WO2024125081A1 (en) * | 2022-12-12 | 2024-06-20 | 中广核研究院有限公司 | Nuclear fuel assembly bottom nozzle comprising constraint anti-foreign matter plate |
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