CN107195335B - Fuel assembly and method of assembling the same - Google Patents
Fuel assembly and method of assembling the same Download PDFInfo
- Publication number
- CN107195335B CN107195335B CN201710365126.2A CN201710365126A CN107195335B CN 107195335 B CN107195335 B CN 107195335B CN 201710365126 A CN201710365126 A CN 201710365126A CN 107195335 B CN107195335 B CN 107195335B
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- mixing
- grid
- fuel
- fuel rod
- wings
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
- G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
- G21C19/02—Details of handling arrangements
- G21C19/04—Means for controlling flow of coolant over objects being handled; Means for controlling flow of coolant through channel being serviced, e.g. for preventing "blow-out"
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
- G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
- G21C3/322—Means to influence the coolant flow through or around the bundles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Fuel-Injection Apparatus (AREA)
- Fuel Cell (AREA)
Abstract
The invention relates to a fuel assembly and a method of assembling the same, the method of assembling comprising: punching a strip and preforming a stirring wing on the strip; assembling the strips to form a grid having a plurality of grid cells; secondarily forming a stirring wing on the grid; and loading the fuel rods into the grid cells in the longitudinal direction. The strip is punched by adopting a conventional punching method, and meanwhile, only the stirring wings are preformed, and the preformed stirring wings are subjected to secondary forming by adopting a high-precision preparation method to shape the stirring wings, so that the influence caused by dimensional tolerance and assembly tolerance is reduced due to the improvement of secondary forming preparation precision, the area of the stirring wings can be correspondingly increased on the basis of ensuring the safety performance, and the gap between the stirring wings and the fuel rod is reduced. The resulting enhanced lateral flow, increased effectiveness against coolant fluid generation; meanwhile, the stirring wings are relatively closer to the fuel rod, so that a fluid layer on the surface of the fuel rod can be effectively destroyed near the fuel rod, and the stirring effect is enhanced.
Description
Technical Field
The present invention relates to nuclear reactors, and more particularly, to a fuel assembly for a nuclear reactor and a method of assembling the same.
Background
Referring to fig. 1, a fuel assembly 1 provided in a nuclear reactor includes an upper stem 11, a guide tube 12, a lattice 13, fuel rods 14, and a lower stem 15. The lattice 13 is longitudinally provided between the upper tube holder 11 and the lower tube holder 15, and the lattice 13 includes a plurality of strips which are mutually intersected and matched to form a plurality of lattice units. The guide tubes 12 are longitudinally provided between the upper tube holder 11 and the lower tube holder 15, with one end fixedly connected to the upper tube holder 11 and the other end fixedly connected to the lower tube holder 15, and the guide tubes 12 may be parallel to each other and provided in the grid unit, whereby the grids 13 may space the guide tubes 12 from each other and control the spacing between the guide tubes 12 to form a support skeleton of the fuel assembly 1. The fuel rods 14 are longitudinally arranged between the upper tube seat 11 and the lower tube seat 15 and in the grid 13, and the fuel rods 14 are generally parallel to each other and are arranged in grid cells which are not occupied by the guide tubes 12.
In a nuclear reactor, coolant of the cooling circulation system flows through the fuel rods 14 of the fuel assembly 1, for example in the a direction (i.e. longitudinal direction), to slow neutrons and carry away the fission energy. For the above cooling cycle, generally, a mixing wing is further disposed on the strip, and the mixing wing extends into the grid unit, when the coolant fluid flows between the fuel rods 14, the coolant fluid is blocked by the mixing wing 16 to form a transverse flow, so that the coolant fluid is mixed, and then transits from a laminar state to a turbulent state, and after the steady state of the coolant fluid is destroyed, the heat of the fuel rods 14 is more easily led out, so that the thermal margin of the fuel assembly 1 can be effectively improved.
Currently, during assembly of the fuel assembly 1, the mixing wings are typically formed integrally with the straps and assembled together with the straps into the grid 13, and then the fuel rods 14 are loaded into the grid cells of the grid 13. In order to ensure that the fuel rod 14 is safely installed in the grid unit, the fuel rod 14 needs to be prevented from touching the mixing wing during the assembly process, and the shape of the mixing wing is strictly required to be manufactured and cannot be changed randomly, however, the mixing wing and the strip need to consider the influence caused by the process dimensional tolerance and the assembly tolerance during the integral forming process, so that the mixing wing cannot occupy too much area of the grid unit, and a sufficient gap is usually required to be reserved between the fuel rod 14 and the mixing wing.
The gap is a key factor affecting the thermal margin in the cooling cycle, if the gap is too large, the transverse flow generated by the stirring wings is weak, and the effectiveness on the coolant fluid is too small; meanwhile, in the mixing process, the fluid layer on the surface of the fuel rod 14 can be damaged by the mixing wing part which is closer to the fuel rod 14, and then the influence on the fuel rod 14 is larger, so that the fluid layer on the surface of the fuel rod 14 cannot be effectively damaged by the excessive gap, and the mixing effect is weakened. In summary, how to avoid the interference between the fuel rod 14 and the mixing wing while ensuring the thermal allowance is a problem to be solved at present.
Disclosure of Invention
The invention aims to solve the technical problem of avoiding interference between a fuel rod and a mixing wing while ensuring thermal allowance, and provides a fuel assembly and an assembly method thereof.
The technical scheme adopted for solving the technical problems is as follows: there is provided a method of assembling a fuel assembly comprising: punching a strip and preforming a stirring wing on the strip; assembling the strips to form a grid having a plurality of grid cells; secondarily forming a stirring wing on the grid; and loading the fuel rods into the grid cells in the longitudinal direction.
In the method of assembling a fuel assembly according to an embodiment of the present invention, in punching a ribbon and preforming a mixing wing on the ribbon, the ribbon is punched while the mixing wing is integrally punched.
In the method of assembling a fuel assembly according to an embodiment of the present invention, a preformed mixing wing is cut to overmold the mixing wing.
In the method of assembling a fuel assembly according to an embodiment of the present invention, the cutting includes laser cutting.
In the method of assembling a fuel assembly according to an embodiment of the present invention, laser cutting is employed to simultaneously overmold a plurality of mixing wings.
In the assembling method of the fuel assembly according to the embodiment of the invention, the laser cutting is adopted to simultaneously secondarily mold the mixing wings of the plurality of grid units; and the fuel rods pass through the plurality of grid cells in sequence in the longitudinal direction.
In the method of assembling a fuel assembly according to an embodiment of the present invention, the center of a circle of a fuel rod to be set in a grid unit is determined, and preformed stirring wings on a strip of the grid unit are cut with the center of the circle as an axis and a length larger than the radius of the fuel rod as an axis.
In the method of assembling a fuel assembly according to an embodiment of the present invention, the outer profile of the mixing wing includes a first segment and a second segment, the first segment being adjacent to the fuel rod within one grid unit; shaping the second section in the preformed mixing wing and the first section in the preformed mixing wing.
The invention also provides a fuel assembly comprising a lattice and fuel rods longitudinally mounted in the lattice; the grid comprises a plurality of strips, the strips are mutually intersected and matched to form a plurality of grid units, the fuel rods are correspondingly positioned in the grid units, the strips are also provided with mixing wings, the strips and the mixing wings are integrally punched into a molded structure, and the mixing wings further comprise secondary molding parts.
In the fuel assembly according to the embodiment of the invention, the clearance between the outer profile of the mixing wing adjacent to the fuel rod and the fuel rod is not more than 2mm.
In a fuel assembly according to an embodiment of the invention, the outer profile of the mixing wing comprises a first section and a second section, the first section being adjacent to the fuel rod within one grid unit; the first segment is an arcuate segment and is concentric with an adjacent fuel rod.
The implementation of the invention has the following beneficial effects: in the assembly method, the strip can be punched by a conventional punching method, meanwhile, only the mixing wing is preformed, then the preformed mixing wing can be subjected to secondary forming by a high-precision preparation method to form the mixing wing, and in the process of secondarily forming the mixing wing, the influence caused by dimensional tolerance and assembly tolerance is reduced due to improvement of the preparation precision, so that the area of the mixing wing can be correspondingly increased on the basis of ensuring the safety performance, and the gap between the mixing wing and a fuel rod is reduced. After the area of the mixing wings in the grid unit is increased, the generated transverse flow is enhanced, so that the effectiveness of the generation of the coolant fluid is improved; at the same time, the gap is reduced so that the mixing wings are relatively closer to the fuel rod, thereby effectively destroying the fluid layer on the surface of the fuel rod near the fuel rod, and enhancing the mixing effect.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic illustration of a prior art fuel assembly;
FIG. 2 is a flow chart of a method of assembling a fuel assembly according to a first embodiment of the present invention;
FIG. 3 is a schematic view of a pre-shaped mixing wing according to an embodiment of the present invention;
FIG. 4 is a schematic view of another pre-shaped mixing wing according to an embodiment of the invention;
FIG. 5 is a schematic partial cross-sectional view of a fuel assembly according to an embodiment of the invention;
FIG. 6 is a schematic view of the structure of a mixing wing according to an embodiment of the present invention.
Detailed Description
Referring to fig. 2, the method of assembling a fuel assembly according to a first embodiment of the present invention includes: s100, punching a strip and preforming stirring wings on the strip; step S200, assembling the strips to form a grid with a plurality of grid units; step S300, secondarily forming a stirring wing on the grid; and step S400, loading the fuel rods in the grid units along the longitudinal direction.
In the assembly method, the strip can be punched by adopting a conventional punching method, meanwhile, only the stirring wing is preformed, then the preformed stirring wing can be subjected to secondary forming by adopting a high-precision preparation method to shape the stirring wing, and in the process of secondarily forming the stirring wing, the influence caused by dimensional tolerance and assembly tolerance is reduced due to improvement of the preparation precision, so that the area of the stirring wing can be correspondingly increased on the basis of ensuring the safety performance, and the gap between the stirring wing and a fuel rod is reduced. After the area of the mixing wings in the grid unit is increased, the generated transverse flow is enhanced, so that the effectiveness of the generation of the coolant fluid is improved; at the same time, the gap is reduced so that the mixing wings are relatively closer to the fuel rod, thereby effectively destroying the fluid layer on the surface of the fuel rod near the fuel rod, and enhancing the mixing effect.
Although steps S200 and S400 are not described in detail herein, one of ordinary skill in the art may reasonably use any suitable method in the art to implement steps S200 and S400, and will not be described in detail herein. It should be appreciated that any solution formed based on the teachings of the present invention is within the scope of the present invention.
In the method for assembling a fuel assembly according to the second embodiment of the present invention, for step S100, the ribbon is punched and integrally punched to form the mixing wing, and the preformed mixing wing and the ribbon are integrally formed, so that stable connection between the mixing wing and the ribbon can be maintained, and the mixing wing is prevented from falling off from the ribbon.
In the method of assembling a fuel assembly according to the third embodiment of the present invention, for step S300, the pre-formed mixing wings in S100 may be cut to secondarily form the mixing wings, thereby finally shaping the mixing wings. The cutting mode comprises a plurality of non-contact cutting or soft contact modes such as laser cutting, wire cutting and the like, and the final forming of the mixing wing is realized by setting a cutting path. The secondary forming is carried out by adopting a cutting mode easy to focus, so that the shaping precision of the stirring wing can be improved; in addition, the cutting path is easy to adjust, and a plurality of mixing wings can be cut simultaneously, so that the production efficiency is improved. At the same time, the heat affected zone during cutting had little effect on the final shaping of the mixing wings, within acceptable limits.
For example, laser cutting may be used to overmold the mixing wings, and further, laser cutting may also be used to overmold multiple mixing wings simultaneously. In general, the mixing wings of a plurality of grid units can be simultaneously and secondarily molded by laser cutting, and the fuel rod sequentially passes through the plurality of grid units along the longitudinal direction, so that a plurality of mixing wings positioned in the same longitudinal direction can be simultaneously cut along the longitudinal direction.
In a specific implementation manner of the third embodiment, in step S300, a center position of a fuel rod to be set in a grid unit is first determined, and a preformed mixing wing on a strip of the grid unit is cut with the center as an axis and a length greater than a radius of the fuel rod as an axis. Referring specifically to FIG. 3, the pre-shaped mixing wings 160a on the strip include a first portion 161a and a second portion 162a, the second portion 162a being relatively closer to the fuel rod to be subsequently loaded. In step S300, the predetermined mixing wing 160a is cut by a circle drawing method with the center of the fuel rod to be inserted as the axis and the length larger than the radius of the fuel rod as the axis, and the second portion 162a is removed, thereby obtaining the final-shaped mixing wing. The radius of the drawn circle is larger than the radius of the fuel rod to be arranged, for example, the difference of the length of the two radii is not larger than 2mm, the cutting line 163a is a sector section of the drawn circle, which can also be called an arc section, and the gap between the cutting line 163a and the outer surface of the filled fuel rod, namely, the gap between the stirring wing and the fuel rod is not larger than 2mm. The outer profile of the mixing wing obtained by the method comprises a first section and a second section, wherein the first section is a profile section obtained by cutting along a cutting line 163a, the second section is other profile sections except the first section, the first section is closer to a fuel rod in a grid unit where the mixing wing is located, the first section is arc-shaped or fan-shaped and is concentric with the adjacent fuel rod in the grid unit, and by adopting the concentric structure, the efficiency of the mixing wing can be remarkably improved.
The configuration of the pre-shaped mixing wings 160a shown in FIG. 3 is for illustration only and not limiting of the invention, and any suitable pre-shaped mixing wing configuration may be selected by one of ordinary skill in the art based on the teachings of the present invention to facilitate loading of fuel rods into grid cells, and is not specifically set forth herein. For example, referring to fig. 4, there is shown another configuration of a pre-shaped mixing wing 160b, the pre-shaped mixing wing 160b including a first portion 161b and a second portion 162b, the second portion 162b being relatively closer to the fuel rod, the separation line 163b between the first portion 161b and the second portion 162b being the cut line in step S300.
In the method for assembling a fuel assembly according to the fourth embodiment of the present invention, the outer profile of the stirring wing includes a first segment and a second segment, the first segment is relatively closer to the fuel rod in one grid unit, and the gap between the first segment and the outer surface of the fuel rod is the gap between the stirring wing and the fuel rod. For step S100, during the pre-shaping of the mixing wing, shaping the second section of the mixing wing and pre-shaping the first section; for step S300, during the process of secondarily molding the mixing wing, the first segment is shaped, and finally the whole mixing wing is shaped.
The invention also provides a fuel assembly assembled by the assembly method according to any embodiment of the invention. Referring to FIG. 5, a fuel assembly according to one embodiment of the present invention includes a lattice and fuel rods 14 longitudinally mounted in the lattice; the grid comprises a plurality of strips 131, the strips 131 are mutually intersected and matched to form a plurality of grid units 130, the fuel rods 14 are correspondingly positioned in the grid units 130, the strips 131 are further provided with mixing wings 16, the strips and the mixing wings are integrally punched into a molded structure, and the mixing wings further comprise secondary molding parts. The preparation precision of the secondary molding part is improved, and the influence caused by dimensional tolerance and assembly tolerance is reduced, so that the area of the mixing wing can be correspondingly increased on the basis of ensuring the safety performance, and the gap between the mixing wing and the fuel rod is reduced.
Referring to fig. 6, in one embodiment, the mixing wing 26 includes a first portion 261 and a second portion 262, the second portion 262 being closer to the fuel rod within the grid unit, a boundary 263 between the first portion 261 and the second portion 262 not actually being present, and the first portion 261 and the second portion 262 being integral for convenience of description only. The outer contour 26a of the second portion 262 adjacent the fuel rod is a overmold portion and the other outer contour 26b is an integral portion with the strap.
Still referring to FIG. 5, in the fuel assembly, the clearance 17 between the outer profile of the mixing wings 16 adjacent the fuel rods 14 and the fuel rods 14 is no greater than 2mm. This gap 17 is smaller than the conventional gap of the prior art. By reducing the size of the gap 17, the cross flow generated after the area of the mixing wings 16 in the grid cell 130 is increased, thereby increasing the effectiveness of the coolant fluid generation; at the same time, the gap 17 is reduced so that the mixing wings 16 are relatively closer to the fuel rod 14, whereby the fluid layer on the surface of the fuel rod 14 can be effectively broken near the fuel rod 14, and the mixing effect is enhanced.
Still referring to FIG. 5, in a fuel assembly according to an exemplary embodiment of the present invention, the outer profile of the blending wing 16 includes a first segment 161 and a second segment 162, the first segment 161 being an arcuate segment; the first segment 161 is adjacent to the fuel rod 14 within one grid unit 130 and concentric with the adjacent fuel rod 14, which concentric structure may improve the efficiency of operation of the mixing wing 16. Based on the center of the circle, the radius of the fuel rod 14 is smaller than the radius of the arc segment (which may be specifically the fitting radius of the arc segment), and the difference is not greater than 2mm.
Referring still to FIG. 5, in another example embodiment of the fuel assembly of the invention, the straps 131 are further provided with a rigid male member 18, the rigid male member 18 extending into the grid cell 130 and against the outer surface of the fuel rod 14. Specifically, the rigid convex member 18 includes a support portion 181 and an abutting portion 182 that are connected, the support portion 181 being a rigid member connected to the strap 131, and the abutting portion 182 being an elastic member that protrudes into the grid unit 130 and abuts against the fuel rod 14. At least two of the four strips 131 surrounding the same grid unit 130 are each provided with a rigid male member 18, and since the rigid male members 18 are intended to abut against the fuel rods 14, the plurality of rigid male members 18 of the same grid unit 130 cooperate with each other to have an approximately circular fitting contour (not shown) with the radius of the fuel rods 14 as a radius, which approximately circular fitting contour substantially coincides with the contour of the outer surface of the fuel rods 14.
Accordingly, in step S300, if the strips of the grid are provided with the rigid convex members, a circle fitting contour line may be made on the plurality of rigid convex members in the same grid unit with the radius of the fuel rod as the radius, and the center of the circle fitting contour line may be determined as the center of the fuel rod with the load.
It is to be understood that the above examples only represent preferred embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the invention; it should be noted that, for a person skilled in the art, the above technical features can be freely combined, and several variations and modifications can be made without departing from the scope of the invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (8)
1. A method of assembling a fuel assembly, comprising: punching a strip and preforming a mixing wing on the strip; assembling the strips to form a grid having a plurality of grid cells; secondarily forming the stirring wings on the grid; and loading fuel rods in the grid cells in the longitudinal direction;
wherein, the overmoulding the stirring wing includes: determining the circle center of the fuel rod to be arranged in the grid unit, and cutting the preformed stirring wing on the strip of the grid unit by taking the circle center as an axis and taking the length larger than the radius of the fuel rod as an axis, wherein the difference between the length of the axis and the radius of the fuel rod is not larger than 2mm.
2. The method of assembling a fuel assembly of claim 1, wherein the stamping the strip and preforming the mixing wings on the strip integrally stamps the mixing wings at the same time as stamping the strip.
3. The method of assembling a fuel assembly of claim 1, wherein the pre-formed blending wings are cut to overform the blending wings.
4. A method of assembling a fuel assembly according to claim 3, wherein the cutting comprises laser cutting.
5. The method of assembling a fuel assembly of claim 4, wherein the fuel rods pass through the plurality of grid cells in sequence in the longitudinal direction; the overmoulding the mixing wing further comprises: and simultaneously cutting a plurality of preformed mixing wings positioned in the same longitudinal direction by adopting laser cutting so as to simultaneously secondarily mold the mixing wings of a plurality of grid units.
6. The method of assembling a fuel assembly of any one of claims 1-5, wherein the outer profile of the mixing wing includes a first segment and a second segment, the first segment being adjacent the fuel rod within one of the grid cells; shaping the second section in the preformed mixing wing and pre-shaping the first section, and shaping the first section in the post-formed mixing wing.
7. A fuel assembly comprising a lattice, and fuel rods longitudinally mounted in the lattice; the grid comprises a plurality of strips, the strips are mutually intersected and matched to form a plurality of grid units, and the fuel rods are correspondingly positioned in the grid units, and the grid is characterized in that the strips are also provided with mixing wings, the strips and the mixing wings are integrally punched into a molded structure, and the mixing wings also comprise secondary molding parts;
wherein the mixing wing comprises a first part and a second part, the second part is closer to the fuel rod in the grid unit, and the outer contour of the second part, which is close to the fuel rod, is the secondary molding part;
the clearance between the outer profile of the mixing wing adjacent to the fuel rod and the fuel rod is not more than 2mm.
8. The fuel assembly of claim 7, wherein the outer profile of the mixing wing includes a first segment and a second segment, the first segment being adjacent the fuel rod within one of the grid cells; the first segment is an arc segment and is concentric with the adjacent fuel rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710365126.2A CN107195335B (en) | 2017-05-22 | 2017-05-22 | Fuel assembly and method of assembling the same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710365126.2A CN107195335B (en) | 2017-05-22 | 2017-05-22 | Fuel assembly and method of assembling the same |
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| CN107195335A CN107195335A (en) | 2017-09-22 |
| CN107195335B true CN107195335B (en) | 2023-06-13 |
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| CN201710365126.2A Active CN107195335B (en) | 2017-05-22 | 2017-05-22 | Fuel assembly and method of assembling the same |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018214006A1 (en) * | 2017-05-22 | 2018-11-29 | 岭东核电有限公司 | Fuel assembly and method for assembling same |
| CN112071443B (en) * | 2020-08-26 | 2023-03-21 | 西安交通大学 | Nuclear fuel assembly spacer grid based on 3D prints |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6421407B1 (en) * | 1999-06-11 | 2002-07-16 | Korea Atomic Energy Research Institute | Nuclear fuel spacer grid with dipper vanes |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2665292B1 (en) * | 1990-07-24 | 1992-11-13 | Framatome Sa | ADDITIONAL GRILLE FOR FUEL ASSEMBLY OF NUCLEAR REACTOR AND ASSEMBLY COMPRISING APPLICATION. |
| FR2666678B1 (en) * | 1990-07-24 | 1993-07-30 | Framatome Sa | GRILLE WITH MIXING FINS FOR NUCLEAR FUEL ASSEMBLY. |
| GB9707690D0 (en) * | 1997-04-16 | 1997-06-04 | British Nuclear Fuels Plc | Improvements in or relating to fuel assemblies |
| CN102568632B (en) * | 2012-03-02 | 2015-04-22 | 中科华核电技术研究院有限公司 | Screenwork for nuclear fuel component and mixing stick for screenwork |
| EP2741297A1 (en) * | 2012-12-04 | 2014-06-11 | Areva NP | Fuel rod support insert for a nuclear fuel assembly spacer grid, spacer grid and nuclear fuel assembly |
| CN103050153B (en) * | 2012-12-20 | 2016-02-17 | 中国核动力研究设计院 | For nuclear fuel assembly, there is the grid spacer that anti-hooking and friendship mix up |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6421407B1 (en) * | 1999-06-11 | 2002-07-16 | Korea Atomic Energy Research Institute | Nuclear fuel spacer grid with dipper vanes |
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