CN109935362B - Fuel assembly, lower tube seat thereof and bottom device of fuel assembly - Google Patents
Fuel assembly, lower tube seat thereof and bottom device of fuel assembly Download PDFInfo
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- CN109935362B CN109935362B CN201711369548.3A CN201711369548A CN109935362B CN 109935362 B CN109935362 B CN 109935362B CN 201711369548 A CN201711369548 A CN 201711369548A CN 109935362 B CN109935362 B CN 109935362B
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- matter prevention
- tube seat
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- 239000000446 fuel Substances 0.000 title claims abstract description 148
- 230000002265 prevention Effects 0.000 claims abstract description 71
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- 238000001914 filtration Methods 0.000 claims description 7
- 238000004804 winding Methods 0.000 claims description 7
- 239000000498 cooling water Substances 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims 1
- 230000004907 flux Effects 0.000 abstract 1
- 239000002826 coolant Substances 0.000 description 14
- 125000006850 spacer group Chemical group 0.000 description 8
- 238000005253 cladding Methods 0.000 description 5
- 239000003758 nuclear fuel Substances 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000011148 porous material Substances 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 the technical field of reactor engineering, and particularly relates to a fuel assembly, a lower tube seat thereof and a bottom device of the fuel assembly. Comprising the following steps: the support legs are arranged at the lower part of the lower tube seat frame body, and a plurality of equal-diameter through holes, neutron flux tube lower end plug holes and guide tube lower end plug holes are vertically and horizontally crossed and parallel arranged on the upper end face of the lower tube seat frame body; the equal-diameter through holes are all round. A bottom device, comprising: the lower tube seat and the foreign matter prevention assembly connected with the lower tube seat are the lower tube seat. A fuel assembly, comprising: the device comprises an upper tube seat, a fuel rod, a positioning grid, a guide tube, an instrument tube and a bottom device; the fuel rod, the guide pipe and the instrumentation pipe are inserted into the positioning grid; the plurality of the positioning grids are arranged in sequence along the axial direction; the upper ends of the guide pipe and the instrumentation pipe are fixedly connected with the upper pipe seat, and the lower ends of the guide pipe and the instrumentation pipe are fixedly connected with the bottom device; the base unit further comprises: a lower tube seat and a foreign matter prevention component; the lower stem is the lower stem as defined in any one of the above.
Description
Technical Field
The invention belongs to the technical field of reactor engineering, and particularly relates to a fuel assembly, a lower tube seat thereof and a bottom device of the fuel assembly.
Background
The nuclear fuel is generally designed in a solid cylinder shape and consists of upper and lower end plugs, pellets, compression springs and cladding, and coolant flows through the cladding to cool the fuel rods. The annular fuel is formed by an inner cladding and an outer cladding, and the coolant can take away heat emitted by the fuel from the inner side and the outer side simultaneously.
The fuel assembly bottom device is located the fuel assembly bottom, including the lower tube seat and prevent the foreign matter subassembly, be provided with the coolant flow hole on the lower tube seat for the circulation of cooling water and play flow distribution's effect to the coolant, prevent the foreign matter that probably contains in the foreign matter subassembly can intercept the coolant, prevent to cause the damage to the fuel rod, the circulation hole design of lower tube seat in the current fuel assembly can not effectively reduce pressure drop if to annular fuel assembly.
In addition, in the existing pressurized water reactor fuel assembly design, the fuel rods are generally clamped and suspended by a positioning grid. The lower tube seat supports the whole fuel assembly through the guide tube, and the foreign matter prevention assembly is generally arranged on the upper end face of the lower tube seat. At the end of the reactor operating period, the clamping force of the springs clamping the fuel rods is drastically reduced due to irradiation, the fuel rods generally fall on the lower tube seat, and the fuel rods may move up and down due to the flow of the coolant, which may cause a risk of breakage of the fuel rods.
In view of the above, design considerations secure the fuel rod inside the lower stem, and the spacer grid does not provide a clamping force for the fuel rod support, but only lateral positioning. If the annular fuel rod is fixed in the lower tube seat, if the existing foreign matter prevention component design is adopted, the foreign matter prevention function is only realized on the outer flow passage of the fuel rod, and the foreign matter prevention device is not arranged on the inner flow passage of the fuel rod, so that the foreign matter prevention device also needs to be redesigned.
The related literature in the prior art discloses that the lower tube seat of the reactor fuel assembly is designed based on the fuel assembly suspended at the upper part of the upper tube seat, and the foreign matter prevention assembly is not suitable for the design of the annular fuel assembly. Thus, a novel bottom device and bottom nozzle have been developed.
Disclosure of Invention
The invention aims to provide a fuel assembly, a lower tube seat thereof and a bottom device of the fuel assembly, which solve the technical problem that the lower tube seat of the fuel assembly in the prior art is insufficient in the application of the fuel assembly.
The technical scheme of the invention is as follows:
A bottom nozzle of a fuel assembly, comprising: the device comprises a lower tube seat frame body, support legs arranged at the lower part of the lower tube seat frame body, a plurality of equal-diameter through holes which are vertically and horizontally crossed and arranged on the upper end surface of the lower tube seat frame body in parallel, neutron measurement tube holes and guide tube lower end plug holes; the equal-diameter through holes are all round.
The through holes with equal diameters comprise through holes and main flow water holes C, and the main flow water holes C are uniformly arranged between the adjacent through holes; and the aperture of the main flow water hole C is smaller than that of the through hole. ,
Rectangular through holes are also arranged between the adjacent through holes.
The rectangular structure through hole as described above includes: a main water hole A and a main water hole B; the main flow water holes A are uniformly formed in the center of a rectangle surrounded by every four adjacent through holes.
The main water hole B is arranged around the neutron measurement tube hole and the lower end plug hole of the guide tube.
The ratio of the cross-sectional areas of the main flow water holes a and the main flow water holes B is 1 to 1.4 as described above.
The through holes are used for mounting fuel rods and/or circulating cooling water as described above.
The fuel rods mounted as described above are annular fuel rods.
The size and arrangement of the openings of the through holes and the holes at the lower ends of the guide tubes are matched with those of the fuel rods and the guide tubes in the fuel assembly, and the number of the guide tubes can be set to be a multiple of four according to the requirement.
As mentioned above, the upper end faces of the inner walls of the through holes and the lower end plug holes of the guide pipes are respectively provided with a chamfer structure.
The chamfer angle α ranges from 10 ° to 30 ° as described above.
A bottom device, comprising: the lower tube seat and the foreign matter prevention assembly connected with the lower tube seat are the lower tube seat.
The foreign matter prevention assembly as described above includes: the device comprises a foreign matter prevention net frame body and a foreign matter prevention net connected with the foreign matter prevention net frame body, wherein the foreign matter prevention net is provided with a plurality of filtering units; the anti-foreign body frame body is of a square structure as a whole, and grooves are formed in four corners of the anti-foreign body frame body.
The foreign matter prevention component is arranged in the lower tube seat, and the distance between the foreign matter prevention component and the lower end of the fuel component is 1.3mm; the four edges of the edge part of the foreign matter prevention net frame body are folded upwards by 90 degrees.
The foreign matter prevention net is attached to the lower surface of the foreign matter prevention net frame body, and the periphery of the edge part of the foreign matter prevention net is attached to the edge part of the foreign matter prevention net frame body.
The four corners of the foreign matter prevention net are also provided with grooves which are matched with the grooves on the foreign matter prevention frame body in size.
The filter cell holes are square, circular or regular hexagonal in structure as described above.
A fuel assembly, comprising: the device comprises an upper tube seat, a fuel rod, a positioning grid, a guide tube, an instrument tube and a bottom device; the fuel rod, the guide pipe and the instrumentation pipe are inserted into the positioning grid; the plurality of the positioning grids are arranged in sequence along the axial direction; the upper ends of the guide pipe and the instrumentation pipe are fixedly connected with the upper pipe seat, and the lower ends of the guide pipe and the instrumentation pipe are fixedly connected with the bottom device; the base unit further comprises: a lower tube seat and a foreign matter prevention component; the lower stem is the lower stem as defined in any one of the above.
The bottom device is any one of the above; the fuel rod is a double-sided cooling annular fuel rod.
The fuel assembly as described above further includes a plurality of double-sided cooled annular fuel rods with windings disposed within the shroud or fuel cartridge.
The beneficial effects of the invention are as follows:
The invention provides a fuel assembly, a lower tube seat thereof and a bottom device of the fuel assembly, wherein a fuel rod is inserted and fixed in the lower tube seat on the basis of the structural design of the existing fuel assembly, and a positioning grid frame does not provide clamping force for supporting the fuel rod any more and only provides a transverse positioning function.
The invention has the advantages of low flow resistance and strong foreign matter prevention function, can fix the fuel rod, and has the functions of the fuel support assembly and the interface with the reactor core structure not affected while meeting the functions.
The invention provides a bottom device structure of a fuel assembly, which has large flow area, small manufacturing difficulty, simple manufacturing process and high structural strength, and the flow area of the lower tube seat designed by the invention is 0.6 percent larger than that of the lower tube seat with the foreign matter prevention net, so that the pressure drop of the bottom device is effectively reduced. The circular flow holes among the lower tube seat rods have the advantages that: the flow rate of the narrowest part between the fuel rods can be greatly increased, the heat exchange characteristic of the narrowest part is effectively improved, and the fuel safety is improved. The design ensures that the flow of the cooling water is reasonably distributed when the cooling water passes through the lower tube seat, reduces the requirement on the design of the grid stirring, and reduces the difficulty of the overall design of the assembly.
The double-sided cooling annular fuel rod with the winding wires, which is wound outside the annular fuel rod, has the effect of obviously increasing the transverse flow of the coolant, enhances the heat transfer effect from the fuel rod to the coolant, takes away more heat of a heat channel through the turbulent flow of the coolant, reduces the temperature of the fuel rod, improves DNBR and enhances the safety of the fuel rod.
The double-sided cooling annular fuel rod with the wire winding can be cooled on both sides, namely, coolant can flow inside and outside the fuel rod to cool the fuel rod. Compared with the existing pressurized water reactor fuel rod structure, the fuel heat transfer area is increased by 50%, the highest temperature of the fuel core block is reduced by 1000 ℃, the linear power density is increased by 20% -50%, and the flow resistance is reduced by 20%.
Drawings
FIG. 1 is a schematic illustration of a fuel assembly in accordance with some embodiments of the invention;
FIG. 2 is a top view of a bottom nozzle according to the present invention;
FIG. 3 is a schematic view of a bottom device according to the present invention;
FIG. 4 is an enlarged view of a through hole of the bottom bracket according to the present invention;
Fig. 5 is a schematic view of a fuel assembly with wire windings according to the present invention.
Wherein: 1-bottom device, 2-fuel rod, 3-spacer grid, 4-upper tube seat, 5-wire winding, 11-lower tube seat frame body, 12-supporting leg, 13-foreign matter preventing net frame body, 14-foreign matter preventing net, 15-through hole and 16-neutron measuring tube hole; 17-plugging the lower end of the guide tube; 18-main flow water hole A, 19-main flow water hole B, 20-main flow water hole C.
Detailed Description
The technology of the present invention will be further described with reference to specific examples:
as shown in fig. 1 to 5, a fuel assembly and a lower stem thereof and a bottom assembly of the fuel assembly,
A bottom nozzle of a fuel assembly, comprising: the device comprises a lower tube seat frame 11, a supporting leg 12 arranged at the lower part of the lower tube seat frame 11, a plurality of equal-diameter through holes which are vertically and horizontally crossed and arranged on the upper end surface of the lower tube seat frame 11 in parallel, a neutron measurement tube hole 16 and a guide tube lower end plug hole 17; the equal-diameter through holes are all round.
The equal-diameter through holes comprise through holes 15 and main water holes C20, and the main water holes C20 are uniformly arranged between adjacent through holes 15; the aperture of the main flow water hole C20 is smaller than that of the through hole 15.,
Rectangular through holes are arranged between the adjacent through holes 15.
The rectangular structure through hole comprises: a main flow hole a18 and a main flow hole B19; the main flow water holes A18 are uniformly arranged at the center of a rectangle surrounded by every four adjacent through holes 15.
The main flow water hole B19 is arranged around the neutron measurement tube hole 16 and the guide tube lower end plug hole 17.
The ratio of the cross-sectional areas of the main flow water holes A18 and the main flow water holes B19 is 1-1.4. The main flow water holes A18 and the main flow water holes B19 have uniform pore size distribution and larger flow area, so as to prevent the lower tube seat from having larger pressure drop.
The through holes 15 are used for mounting fuel rods and/or circulating cooling water.
The installed fuel rods are annular fuel rods.
The size and arrangement of the openings of the through holes 15 and the holes 17 at the lower ends of the guide pipes are matched with those of the fuel rods and the guide pipes in the fuel assembly, and the number of the guide pipes can be set to be a multiple of four according to the requirement.
The through holes 15 and the upper end surface of the inner wall of the guide tube lower end plug hole 17 are respectively provided with a chamfer structure, and are used for guiding, fixing and centering when the fuel rod is inserted into the lower tube seat, and clamping the fuel rod by combining with the lower end surface of the lower tube seat so as to prevent the fuel rod from being ejected during operation.
The chamfer angle alpha ranges from 10 degrees to 30 degrees.
A bottom device, comprising: the lower tube seat and the foreign matter prevention assembly connected with the lower tube seat are the lower tube seat.
The foreign matter prevention assembly includes: a foreign matter prevention net frame 13 and a foreign matter prevention net 14 connected with the foreign matter prevention net frame 13, wherein a plurality of filtering units are arranged on the foreign matter prevention net 14; the whole square structure of foreign matter prevention frame 13, the four angles of foreign matter prevention frame 13 are provided with the recess.
The foreign matter prevention component is arranged in the lower tube seat, and the distance between the foreign matter prevention component and the lower end of the fuel component is 15.3mm; the four edges of the edge part of the foreign matter prevention net frame body 13 are folded up by 90 degrees.
The foreign matter prevention net is attached to the lower surface of the foreign matter prevention net frame body 13, and the periphery of the edge part of the foreign matter prevention net 14 is attached to the edge part of the foreign matter prevention net frame body 13.
The four corners of the foreign matter prevention net 14 are also provided with grooves which are matched with the grooves on the foreign matter prevention frame 13 in size.
The filtering hole unit holes are square, round or regular hexagon structures.
A fuel assembly, comprising: upper tube seat 4, fuel rod 2, spacer grid 3, guide tube, instrumentation tube and bottom device 1; the fuel rods 2, the guide pipes and the instrumentation pipes are inserted into the positioning grids 3; the structure forms a fuel assembly frame structure and is used for supporting and binding the annular fuel rods, so that the fuel rods can be arranged at the proper position of the reactor core, and the fuel rods are ensured not to move during transportation hoisting and normal operation.
The number of the positioning grids 3 is plural, and the positioning grids are sequentially arranged along the axial direction; the upper ends of the guide pipe and the instrumentation pipe are fixedly connected with the upper pipe seat 4, and the lower ends of the guide pipe and the instrumentation pipe are fixedly connected with the bottom device 4; the base unit further comprises: a lower tube seat and a foreign matter prevention component; the lower stem is the lower stem as defined in any one of the above.
The bottom device 1 is a bottom device as defined in any one of the above; the fuel rod 2 is a double-sided cooling annular fuel rod.
The fuel assembly further comprises a plurality of double-sided cooled annular fuel rods with wires 5, which are placed in the shroud or fuel cartridge with wires 5.
In some embodiments, the fuel assemblies are transversely aligned through the spacer grids 3, and the lower parts of the fuel rods 2 are fixedly clamped in the lower tube seats, so that the spacer grids 3 do not need to provide clamping force, the structure of the spacer grids 3 is simplified, and the design and manufacturing difficulty of the spacer grids 3 are reduced.
In some embodiments, the fuel rods 2 are arranged in a square shape as a whole, and each fuel rod comprises eight guide pipes and one instrumentation pipe; the fuel rod 2 is of an annular hollow inner and outer cladding structure; the fuel assembly adopts a ring-shaped fuel rod with the fuel rod cooled on the inner side and the outer side, and the coolant circulates in the inner side and the outer side to cool the fuel rod 2.
In some embodiments, the upper tube seat 4 is provided with a water hole for circulating the coolant; the upper tube seat 4 is used for hoisting the fuel assembly, is supported in the container during transportation, is connected with the framework screw and the guide tube connecting tube, and is provided with a compression spring at the upper part, is matched with the upper grid plate of the reactor core to realize the compression of the fuel assembly in the reactor, and can prevent the fuel assembly from moving in the reactor core.
In some embodiments the backbone screw and guide tube connecting tube are used to connect the top tube holder and guide tube assembly, and the backbone screw is configured to mate with the top tube holder to prevent loosening. The guide tube assembly is used for supporting and connecting the whole assembly, the upper end is connected with an upper tube seat line through a framework screw and a guide tube connecting tube, the middle is directly connected with the positioning grid 3, and the lower part is connected with the lower tube seat through a framework shaft shoulder screw. The skeleton shoulder screw is used for connecting the lower tube seat and the guide tube assembly and is structured to be matched with the lower tube seat to prevent loosening.
In some embodiments the spacer grid 3 is used to hold the annular fuel rod, position the annular fuel rod in the annular fuel assembly, and prevent axial and radial movement of the annular fuel rod, the spacer grid 3 being directly connected to the guide tube assembly.
In some embodiments, the four legs 12 are respectively located at four corners of the lower end of the lower tube seat frame 11, and a positioning hole is formed at the lower end of one group of diagonal legs 12, and the positioning hole is matched with a pin of a lower grid plate of the reactor core to support and fix the fuel assembly, so that the fuel assembly is positioned in the reactor, the flow-induced vibration of the fuel rod 2 is reduced, the abrasion of the fuel rod 2 is reduced, the damage risk of the fuel rod 2 is further reduced, the lower end of the fuel rod 2 is fixed in the lower tube seat, the phenomenon that the fuel rod falls at the end of the service life of the fuel assembly in the past does not occur, and the safety of the fuel assembly is improved.
In some embodiments, the side edges around the lower tube seat are provided with side plates, the side plates are provided with positioning holes, the foreign matter prevention component is fixedly arranged at the lower part of the lower tube seat through the positioning holes, so that the distribution of the flow of the internal and external flow channels of the fuel rod 2 is facilitated, meanwhile, the foreign matter prevention component is placed at the lower part of the lower tube seat and at a certain distance from the lower end of the fuel rod 2, a coolant flows in the space, foreign matters cannot be accumulated in the water holes, and the blockage of the water holes can be prevented.
In some embodiments, the foreign matter prevention assembly is a square structure, comprising: the foreign matter prevention net 14 and the foreign matter prevention net frame 13, the structure of the foreign matter prevention net frame 13 can be designed into various shapes, such as: trapezoid, etc., and has sufficient strength to withstand coolant impact loads.
In some embodiments, the foreign matter prevention net frame body 13 is integrally processed by thick plates, and the thickness is 3 mm-8 mm. The foreign matter prevention net frame body 13 is provided with a plurality of foreign matter prevention net frame body ribs which are arranged on the frame body at intervals in parallel, and the foreign matter prevention net frame body ribs are provided with threaded holes. The foreign matter preventing net 14 is integrally processed from a thin plate, the thickness is 0.8 mm-3 mm, the shape of the filtering hole unit of the foreign matter preventing net 14 can be square, round, regular hexagon and the like, and the side length of the filtering hole unit can be 0.15-0.35 mm.
The present invention has been described in detail with reference to the embodiments, but the present invention is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.
Claims (10)
1. A bottom assembly of a fuel assembly, comprising: the lower tube seat and prevent foreign matter subassembly rather than being connected, its characterized in that: the lower stem includes: the device comprises a lower tube seat frame body (11), a supporting leg (12) arranged at the lower part of the lower tube seat frame body (11), a plurality of equal-diameter through holes which are vertically and horizontally crossed and parallel arranged at the upper end surface of the lower tube seat frame body (11), neutron measurement tube holes (16) and guide tube lower end plug holes (17); the device is characterized in that the equal-diameter through holes are all round;
The constant-diameter through holes comprise a plurality of through holes (15) and a plurality of main water holes C (20), and the main water holes C (20) are uniformly arranged between the adjacent through holes (15); the aperture of the main flow water hole C (20) is smaller than that of the through hole (15);
chamfer structures are arranged on the upper end surfaces of the inner walls of the through holes (15) and the guide pipe lower end plug holes (17);
the range of the chamfer angle alpha is 10-30 degrees;
Rectangular through holes are arranged between the adjacent through holes (15); the rectangular structure through hole comprises: a main water hole A (18) and a main water hole B (19); the main flow water holes A (18) are uniformly arranged at the rectangular center position surrounded by every four adjacent through holes (15); the main flow water holes B (19) are arranged around the neutron measurement tube holes (16) and the guide tube lower end plug holes (17);
The foreign matter prevention assembly includes: a foreign matter prevention net frame body (13) and a foreign matter prevention net (14) connected with the foreign matter prevention net frame body (13), wherein a plurality of filtering units are arranged on the foreign matter prevention net (14); the whole foreign matter prevention net frame body (13) is of a square structure, and grooves are formed in four corners of the foreign matter prevention net frame body (13);
the foreign matter prevention component is arranged in the lower tube seat, and the distance between the foreign matter prevention component and the lower end of the fuel component is 15.3mm; four edges of the edge part of the foreign matter prevention net frame body (13) are folded upwards by 90 degrees;
The foreign matter prevention net is attached to the lower surface of the foreign matter prevention net frame body (13), and the periphery of the edge part of the foreign matter prevention net (14) is attached to the edge part of the foreign matter prevention net frame body (13).
2. A fuel assembly base unit according to claim 1, wherein: the ratio of the cross-sectional areas of the main flow water holes A (18) and the main flow water holes B (19) is 1-1.4.
3. A fuel assembly base unit according to claim 2, wherein: the through holes (151) are used for installing fuel rods and/or circulating cooling water.
4. A fuel assembly base unit according to claim 3, wherein: the installed fuel rods are annular fuel rods.
5. A fuel assembly base assembly according to claim 4, wherein: the size and arrangement of the holes of the through holes (15) and the holes (17) at the lower ends of the guide pipes are matched with those of the fuel rods and the guide pipes in the fuel assembly, and the number of the guide pipes can be set to be four times as required.
6. A fuel assembly base assembly according to claim 5, wherein: grooves are also formed in the four corners of the foreign matter prevention net (14) and are matched with the grooves in the foreign matter prevention net frame body (13) in size.
7. A fuel assembly base assembly according to claim 6, wherein: the holes of the filtering units are square, round or regular hexagonal structures.
8. A fuel assembly, comprising: the device comprises an upper tube seat (4), fuel rods (2), a positioning grid (3), a guide tube, an instrumentation tube and a bottom device (1); the fuel rod (2), the guide pipe and the instrumentation pipe are inserted into the positioning grid (3); the plurality of the positioning grids (3) are arranged in sequence along the axial direction; the upper ends of the guide pipe and the instrumentation pipe are fixedly connected with the upper pipe seat (4), and the lower ends of the guide pipe and the instrumentation pipe are fixedly connected with the bottom device (1); the base unit further comprises: a lower tube seat and a foreign matter prevention component; the method is characterized in that: the bottom device (1) is a bottom device as claimed in claim 1.
9. A fuel assembly according to claim 8, wherein: the fuel rod (2) is a double-sided cooling annular fuel rod.
10. The fuel assembly of any one of claims 8 or 9, wherein: the fuel assembly further comprises a plurality of double-sided cooled annular fuel rods with windings (5), which are placed in the shroud or fuel cartridge with the windings (5).
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 |
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| CN109935362A CN109935362A (en) | 2019-06-25 |
| CN109935362B true CN109935362B (en) | 2024-05-14 |
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| CN201711369548.3A Active CN109935362B (en) | 2017-12-19 | 2017-12-19 | Fuel assembly, lower tube seat thereof and bottom device of fuel assembly |
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Families Citing this family (2)
| 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 |
| 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 |
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| CN208580588U (en) * | 2017-12-19 | 2019-03-05 | 中国原子能科学研究院 | A kind of bottom device of fuel assembly and its bottom nozzle and fuel assembly |
| 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 |
| 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 |
| 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 |
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