CN112071443B - Nuclear fuel assembly spacer grid based on 3D prints - Google Patents
Nuclear fuel assembly spacer grid based on 3D prints Download PDFInfo
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- CN112071443B CN112071443B CN202010867830.XA CN202010867830A CN112071443B CN 112071443 B CN112071443 B CN 112071443B CN 202010867830 A CN202010867830 A CN 202010867830A CN 112071443 B CN112071443 B CN 112071443B
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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
- G21C3/34—Spacer grids
- G21C3/3424—Fabrication of spacer grids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y80/00—Products made by additive manufacturing
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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
- G21C3/34—Spacer grids
- G21C3/3432—Grids designed to influence the coolant, i.e. coolant mixing function
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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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- Engineering & Computer Science (AREA)
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- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
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- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structure Of Emergency Protection For Nuclear Reactors (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
A nuclear fuel assembly spacer grid based on 3D printing comprises an internal structure and a peripheral structure; the internal structure comprises internal grid units in a square array, and each internal grid unit consists of two internal double-sided elastic clamping units and two internal double-sided rigid convex units; the peripheral structure is formed by surrounding an external single-sided elastic clamping unit or an external single-sided rigid convex unit and an internal double-sided elastic clamping unit and an internal double-sided rigid convex unit outside the internal structure into an external grid unit, and fuel rods are arranged in the grid unit; the inner double-sided elastic clamping unit and the inner double-sided rigid convex unit are respectively provided with a mixing wing; the external single-sided elastic clamping unit and the external single-sided rigid convex unit are respectively provided with a guide wing, and water flow impacts the stirring wing and the guide wing in the working process to generate a stirring area on the side surface of the fuel rod; the whole positioning grid frame is integrally formed from metal 3D printing from bottom to top; the invention has the advantages of good clamping effect, improved cooling effect of cooling water and nuclear reaction slowing, small deformation of the periphery of the grillwork and the like.
Description
Technical Field
The invention relates to the technical field of nuclear fuel assemblies, in particular to a nuclear fuel assembly positioning grid frame based on 3D printing.
Technical Field
The spacer grid is used as a key component of the nuclear fuel assembly, plays a role in suspending, clamping and positioning the nuclear reaction fuel rods, so that the fuel rods keep a proper distance, and the structural integrity and the reactor safety of the fuel rods are greatly influenced by the performance of the spacer grid. In the nuclear fuel chain reaction process, because the rivers that need play moderator and coolant effect carry out fast-speed washing away to nuclear fuel assembly to and the irradiation easily leads to adding of grillwork to hold the power and reduce, spacer grid itself needs to have certain intensity, can the centre gripping and support the fuel rod and bear the influence of rivers power and irradiation, avoids the drunkenness of fuel rod, and can also play certain water conservancy diversion effect to high-speed rivers. In addition, because the nuclear fuel assemblies have high transverse flexibility, the nuclear fuel assemblies can only be vertically installed in a hoisting mode in actual installation to prevent excessive lateral deformation, and at the moment, because the distance between the adjacent fuel assemblies is extremely small, an interference phenomenon is easy to occur between the assemblies, and the positioning grids are required to have good installation guiding effect.
In the design of the existing positioning grillwork, the positioning grillwork basically consists of an inner strip structure and an outer strip structure, an inclined spring or a rigid convex structure is arranged on a plate-shaped main body of an inner unit, a mixing wing is arranged at the edge, and various inner strips are reasonably arranged to change a hydraulic field; the plate-shaped main body of the outer strip is similar to the inner strip, and the edge of the plate-shaped main body is generally provided with guide wings to play roles in guiding flow and facilitating the installation of adjacent grillworks. On one hand, the design makes the inner and outer strip structures more complex, and the existing manufacturing scheme usually adopts a plurality of moulds for material reduction or equal material manufacturing, so that the production process cost is too high, and once the characteristics of the grid frame are modified, most of the moulds are required to be produced again; on the other hand, the traditional strip design scheme is easy to ensure that the distance between the inner strip and the surface of the fuel rod is very small (the minimum distance is only about 1.5 mm), thus easily causing the local deficiency of the cooling water flow and the poor cooling and reaction slowing effects; the arrangement of the mixing wings and the guiding wings can also enable the interior of the grids to generate larger flow resistance, and the flow resistance of the area between the adjacent grids is smaller, so that the water pressure difference exists between the inner side and the outer side of the outer strip of the positioning grid, the outer strip of the positioning grid is further in a hydraulic stress state for a long time, and the risk of deformation of the positioning grid is increased.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a nuclear fuel assembly spacer grid based on 3D printing, which has the advantages of good clamping effect, convenience for water flow and fuel rod installation, greatly reduces the manufacturing cost, improves the hydraulic field distribution of the grid and improves the comprehensive performance of the spacer grid.
In order to achieve the purpose, the invention adopts the technical scheme that:
a nuclear fuel assembly spacer grid based on 3D printing comprises an internal structure and an external peripheral structure on the external side of the internal structure; the internal structure comprises internal grid units in a square array, and each internal grid unit consists of two internal double-sided elastic clamping units 1 and two internal double-sided rigid-convex units 2; the peripheral structure is formed by surrounding an external single-sided elastic clamping unit 3 or an external single-sided rigid-convex unit 4, an internal double-sided elastic clamping unit 1 outside the internal structure and an internal double-sided rigid-convex unit 2 into an external grid unit, and fuel rods 7 are arranged in the grid unit;
the inner double-sided elastic clamping unit 1 and the inner double-sided rigid convex unit 2 are respectively provided with an agitating wing 6; the external single-sided elastic clamping unit 3 and the external single-sided rigid-convex unit 4 are respectively provided with a guide wing 5, and in the working process, water flows through from bottom to top to impact the stirring wing 6 and the guide wing 5 to generate a stirring area on the side surface of the fuel rod 7;
the whole positioning grid is integrally formed by metal 3D printing from bottom to top, and the material is high-temperature alloy.
The internal double-sided elastic clamping unit 1 comprises a first plate-shaped main body 1-1, symmetrical elastic clamping structures are designed on two sides of the first plate-shaped main body 1-1, the elastic clamping structures grow upwards from the bottom of the first plate-shaped main body 1-1 at a micro angle smaller than 10 degrees, after a first lower supporting structure 1-4 is formed, the elastic clamping structures continue to grow upwards vertically to form a first supporting surface 1-3, the first supporting surface 1-3 grows upwards in a reverse direction at a micro angle smaller than 10 degrees to form a first upper supporting structure 1-2, and the top of the first upper supporting structure 1-2 is connected with the first plate-shaped main body 1-1;
the external single-sided elastic clamping unit 3 comprises a third plate-shaped main body 3-1, one side of the third plate-shaped main body 3-1 is provided with an elastic clamping structure, the elastic clamping structure grows upwards from the bottom of the third plate-shaped main body 3-1 at a micro angle smaller than 10 degrees, and after a third lower supporting structure 3-4 is formed, the elastic clamping structure continues to grow vertically upwards to form a third supporting surface 3-3; the third supporting surface 3-3 reversely grows upwards to form a third upper supporting structure 3-2 with a micro angle smaller than 10 degrees, and the top of the third upper supporting structure 3-2 is connected with the third plate-shaped main body 3-1.
The elastic clamping structure has an elastic modulus of more than 20N/m, and the joints of the first lower supporting structure 1-4, the first upper supporting structure 1-2, the third lower supporting structure 3-4 and the third upper supporting structure 3-2 and the corresponding plate-shaped main body can be locally thickened; the upper and lower support structures of the elastic clamping structure are provided with elliptical holes on the surfaces or are subjected to rasterization treatment so as to reduce the projection area of the elastic clamping structure in the vertical direction of a hydraulic field.
The internal double-sided rigid-convex unit 2 comprises a second plate-shaped main body 2-1, symmetrical first rigid-convex structures 2-2 are designed on two sides of the second plate-shaped main body 2-1, the first rigid-convex structures 2-2 are in an ellipsoid shape with a long axis in the vertical direction, the ratio of the long axis to the short axis of the ellipsoid exceeds 3;
the external single-side rigid-convex unit 4 comprises a fourth plate-shaped main body 4-1, a second rigid-convex structure 4-2 is arranged on one side of the fourth plate-shaped main body 4-1, the second rigid-convex structure 4-2 is in a vertical ellipsoid shape, the ratio of the major axis to the minor axis of the ellipsoid exceeds 3.
The middle part of the rigid-convex structure is provided with an elliptical hole so as to reduce the projection area of the rigid-convex structure in the vertical direction.
The first plate-shaped main body 1-1, the second plate-shaped main body 2-1, the third plate-shaped main body 3-1 and the fourth plate-shaped main body 4-1 are provided with large-area hollowed-out areas in the middle, arc-shaped grooves are arranged at the edges, the arc-shaped hollowed-out areas and other grid units form an ellipsoidal hollowed-out area, and the area of the hollowed-out parts on the surface accounts for 52% of the area of the original rectangular plate body.
The invention has the beneficial effects that:
compared with the traditional nuclear fuel assembly unit manufactured by using various moulds and processes, the invention uses the 3D printing technology to produce a complex unit structure and a positioning grid integral body, thereby greatly reducing the manufacturing cost and being easy to carry out subsequent optimization; in the design scheme of the spacer grid, the design of an elastic clamping structure growing from the bottom end of a unit to the top end of the unit, a rigid convex structure with a long axis in the vertical direction and the like meets the technical requirements of 3D printing, effectively reduces the addition of supporting bodies in the process of 3D grid printing, and makes the 3D grid printing possible; the design of the arc-shaped contact surface increases the contact area between the clamping part and the fuel rod, and improves the clamping effect; the design of the plurality of hollowed-out areas of the internal grid unit improves the effects of water flow cooling and reaction speed reduction, and the plurality of hollowed-out areas of the external grid unit effectively relieve the grid peripheral deformation phenomenon caused by the water pressure difference inside and outside the spacer grid, thereby improving the safety of the spacer grid.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a top view of the present invention.
FIG. 3 is a schematic view of the present invention with a fuel rod installed.
FIG. 4 is a schematic view of the internal double-sided elastic support unit of the present invention.
Fig. 5 is a left side view of the internal double-sided elastic support unit of the present invention.
FIG. 6 is a schematic view of an external single-sided flexible support unit according to the present invention.
Fig. 7 is a left side view of the external single-sided elastic support unit of the present invention.
Fig. 8 shows several preferred embodiments of the flexible support structure of the present invention.
Fig. 9 is a schematic view of an internal double-sided rigid-convex unit of the present invention.
Fig. 10 is a left side view of the internal biconvex rigid unit of the invention.
FIG. 11 is a schematic view of an external single-sided rigid male unit of the present invention.
Fig. 12 is a left side view of an exterior single-sided rigid-convex unit of the present invention.
Detailed Description
The present invention is described in detail below with reference to the drawings and examples so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making the scope of the present invention more clearly defined.
Referring to fig. 1, 2 and 3, a nuclear fuel assembly spacer grid based on 3D printing, taking a 5 × 5 grid structure as an example, includes an inner structure and an outer peripheral structure at an outer side thereof; the internal structure comprises internal grid units in a 3 multiplied by 3 array, and each internal grid unit consists of two internal double-sided elastic clamping units 1 and two internal double-sided rigid-convex units 2; the peripheral structure is surrounded by an external single-sided elastic clamping unit 3 or an external single-sided rigid convex unit 4 and an internal double-sided elastic clamping unit 1 and an internal double-sided rigid convex unit 2 outside the internal structure to form external grid units, and the number of the external grid units is 16 in the embodiment, so that a complete spacer grid is formed; the whole length and width of the positioning grid in the embodiment are 63.95mm, the height is 38mm, the positioning grid comprises 25 grid units, and the fuel rods 7 are arranged in the grid units;
the inner double-sided elastic clamping unit 1 and the inner double-sided rigid convex unit 2 are respectively provided with an agitating wing 6 so as to change a hydraulic field; the external single-sided elastic clamping unit 3 and the external single-sided rigid-convex unit 4 are respectively provided with a guide wing 5 to change a hydraulic field and facilitate the installation of adjacent fuel assemblies; the arrangement of the guide wings 5 and the muddy wings 6 can be designed in various ways, and in the working process, water flows through from bottom to top to impact the mixing wings 6 and the guide wings 5 to generate a sufficient mixing area on the side surface of the fuel rod 7.
The whole positioning grid is integrally formed from metal 3D printing (such as laser cladding and selective laser melting) from bottom to top, and the material is high-temperature alloy; during installation, 25 fuel rods 7 with round corners at the bottoms and 9.4mm in diameter are inserted into the corresponding grid cells.
Referring to fig. 4 and 5, the internal double-sided elastic clamping unit 1 comprises a first plate-shaped main body 1-1, and symmetrical elastic clamping structures are designed on two sides of the first plate-shaped main body 1-1, so that two sides of a grid unit are uniformly stressed, and the acting force on the adjacent grid unit is reduced; in order to realize forming without or with less support in the 3D printing process, the elastic clamping structure grows upwards at a micro angle (in the embodiment, 3 degrees) from the bottom of the first plate-shaped main body 1-1, after the first lower support structure 1-4 is formed, the elastic clamping structure continues to grow vertically upwards to form a first support surface 1-3, the thickness of the first support surface 1-3 is 0.5mm, the distance between the first support surface 1-3 and the first plate-shaped main body 1-1 is 1.25mm, the first support surface 1-3 has a section of arc surface and can be fully contacted with the fuel rod 7, and a small arc is arranged above the first support surface 1-3, so that the fuel rod 7 with the round corner at the bottom can be conveniently installed; the first supporting surface 1-3 is grown with a first upper supporting structure 1-2 at a reverse upward slight angle (9.5 ° in the embodiment), and the top of the first upper supporting structure 1-2 is connected with the first plate-like body 1-1.
Referring to fig. 6 and 7, the external single-sided elastic clamping unit 3 includes a third plate-shaped body 3-1, one side of the third plate-shaped body 3-1 is provided with an elastic clamping structure, the elastic clamping structure is similar to the elastic clamping structure of the internal double-sided elastic clamping unit 1, in order to realize forming without or less support in the 3D printing process, on one side of the third plate-shaped body 3-1, the elastic clamping structure grows upwards at a slight angle (3 ° in the embodiment) from the bottom of the third plate-shaped body 3-1, and after a third lower support structure 3-4 is formed, the elastic clamping structure continues to grow vertically upwards to form a third support surface 3-3; the thickness of the third supporting surface 3-3 is 0.5mm, the distance between the third supporting surface 3-3 and the third plate-shaped main body 3-1 is 1.25mm, the third supporting surface 3-3 has a section of arc surface which can be fully contacted with the fuel rod 7, and a small arc is also arranged above the third supporting surface 3-3, so that the fuel rod 7 with a round corner at the bottom can be conveniently installed; the third support surface 3-3 is grown with a third upper support structure 3-2 at a reverse upward slight angle (9.5 ° in the embodiment), and the top of the third upper support structure 3-2 is connected with the third plate-like body 3-1.
In order to fully exert the advantages of the 3D printing technology, ensure that the elastic clamping structure has the elastic modulus more than 20N/m and avoid the damage of the upper and lower supporting structures and the supporting surface, the connection parts of the first lower supporting structure 1-4, the first upper supporting structure 1-2, the third lower supporting structure 3-4 and the third upper supporting structure 3-2 and the corresponding plate-shaped main body can be locally thickened; in addition, referring to fig. 8, in order to reduce the water flow resistance inside the spacer grid, the upper and lower support structures of the elastic clamping structure are processed by forming elliptical holes on the surfaces or by rasterization, so as to reduce the projected area in the vertical direction of the hydraulic field.
Referring to fig. 9 and 10, the internal double-sided rigid-convex unit 2 comprises a second plate-shaped main body 2-1, symmetrical first rigid-convex structures 2-2 are designed on two sides of the second plate-shaped main body 2-1, and the height of each first rigid-convex structure 2-2 is 1.75mm, so that the two sides of each grid unit are uniformly stressed, and the acting force on the adjacent grid units is reduced; the first rigid-convex structure 2-2 is in an ellipsoid shape with a long axis in the vertical direction (in the embodiment, the long axis of the ellipsoid is 3mm, and the lengths of the two short axes are 2mm and 1.75mm respectively), so that the occurrence of a support structure in the 3D printing process is reduced, and an arc surface is arranged at the top of the first rigid-convex structure 2-2 and can be fully contacted with the fuel rod 7.
Referring to fig. 11 and 12, the external single-sided rigid-convex unit 4 includes a fourth plate-shaped body 4-1, one side of the fourth plate-shaped body 4-1 is provided with a second rigid-convex structure 4-2, the second rigid-convex structure 4-2 is similar to the first rigid-convex structure 2-2, the height of the second rigid-convex structure 4-2 is 1.75mm, and the second rigid-convex structure 4-2 is in the shape of a vertical ellipsoid (in the embodiment, the major axis of the ellipsoid is 3mm, and the lengths of the two minor axes are 2mm and 1.75mm, respectively), so that the occurrence of a support structure in the 3D printing process is reduced, and a circular arc surface is arranged at the top of the second rigid-convex structure 4-2 and can be in full contact with the fuel rod 7.
In order to reduce the water flow resistance in the spacer grid, the middle of the rigid-convex structure can be provided with elliptical holes (the major axis of the elliptical holes is 0.8mm, and the minor axis of the elliptical holes is 0.3 mm) so as to reduce the projection area of the rigid-convex structure in the vertical direction.
The middle parts of the first plate-shaped main body 1-1 and the second plate-shaped main body 2-1 are provided with large-area hollowed-out areas, the edges of the first plate-shaped main body and the second plate-shaped main body are provided with arc-shaped grooves, the arc-shaped grooves and other grid units form an ellipsoidal hollowed-out area, the area of the hollowed-out parts on the surfaces accounts for 52% of the area of an original rectangular plate body, and the areas can increase the flowing space of water flow at the gap between the fuel rod 7 and the plate-shaped main body of the internal unit, so that the effects of cooling the water flow and slowing down the reaction speed are improved.
The third plate-shaped main body 3-1 and the fourth plate-shaped main body 4-1 have large-area hollowed regions in the middle, arc-shaped grooves are arranged at the edges, the third plate-shaped main body and the fourth plate-shaped main body form an ellipsoidal hollowed region together with other grid units, and the area of the hollowed part on the surface accounts for 52% of the area of the original rectangular plate body.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent flow transformations made by using the contents of the specification and drawings, or applied directly or indirectly to other related arts, are included in the scope of the present invention.
Claims (4)
1. A nuclear fuel assembly spacer grid based on 3D prints, includes the peripheral structure of inner structure and outside thereof, its characterized in that: the internal structure comprises internal grid units in a square array, and each internal grid unit consists of two internal double-sided elastic clamping units (1) and two internal double-sided rigid-convex units (2); the peripheral structure is formed by surrounding an external single-sided elastic clamping unit (3) or an external single-sided rigid-convex unit (4) with an internal double-sided elastic clamping unit (1) and an internal double-sided rigid-convex unit (2) on the outer side of the internal structure to form an external grid unit, and fuel rods (7) are installed in the grid unit;
the internal double-sided elastic clamping unit (1) and the internal double-sided rigid convex unit (2) are respectively provided with a mixing wing (6); the external single-sided elastic clamping unit (3) and the external single-sided rigid convex unit (4) are respectively provided with a guide wing (5), and in the working process, water flows through from bottom to top to impact the stirring wing (6) and the guide wing (5) to generate a stirring area on the side surface of the fuel rod (7);
the whole positioning grid is integrally formed by metal 3D printing from bottom to top, and the material is high-temperature alloy;
the internal double-sided elastic clamping unit (1) comprises a first plate-shaped main body (1-1), symmetrical elastic clamping structures are designed on two sides of the first plate-shaped main body (1-1), and the elastic clamping structures are smaller than the elastic clamping structures from the bottom of the first plate-shaped main body (1-1)
The micro-angle of the first support structure (1-4) grows upwards, the first support structure continues to grow upwards vertically to form a first support surface (1-3), and the upward direction of the first support surface (1-3) is smaller than that of the first support surface
The first upper supporting structure (1-2) grows at a micro angle, and the top of the first upper supporting structure (1-2) is connected with the first plate-shaped main body (1-1);
the external single-sided elastic clamping unit (3) comprises a third plate-shaped main body (3-1), one side of the third plate-shaped main body (3-1) is provided with an elastic clamping structure, the elastic clamping structure grows upwards from the bottom of the third plate-shaped main body (3-1) at a micro angle of less than 10 degrees, and after a third lower supporting structure (3-4) is formed, the elastic clamping structure continues to grow vertically upwards to form a third supporting surface (3-3); the third supporting surface (3-3) is reversely grown to form a third upper supporting structure (3-2) in a micro-angle smaller than 10 degrees, and the top of the third upper supporting structure (3-2) is connected with the third plate-shaped main body (3-1);
the internal double-sided rigid-convex unit (2) comprises a second plate-shaped main body (2-1), symmetrical first rigid-convex structures (2-2) are designed on two sides of the second plate-shaped main body (2-1), the first rigid-convex structures (2-2) are in an ellipsoid shape with a long axis in the vertical direction, the ratio of the long axis to the short axis of the ellipsoid exceeds 3;
the external single-side rigid-convex unit (4) comprises a fourth plate-shaped main body (4-1), a second rigid-convex structure (4-2) is arranged on one side of the fourth plate-shaped main body (4-1), the second rigid-convex structure (4-2) is in a vertical ellipsoid shape, the ratio of the major axis to the minor axis of the ellipsoid exceeds 3, and an arc surface is arranged at the top of the second rigid-convex structure (4-2) and can be fully contacted with a fuel rod (7).
2. The 3D printing-based nuclear fuel assembly spacer grid of claim 1, wherein: the elastic clamping structure is larger than
The elastic modulus of the plate-shaped body is locally thickened at the joint of the first lower supporting structure (1-4), the first upper supporting structure (1-2), the third lower supporting structure (3-4) and the third upper supporting structure (3-2) and the corresponding plate-shaped body; the elastic clamping structureThe upper and lower supporting structures are processed by surface elliptical hole opening or grid processing to reduce the projection area of the upper and lower supporting structures in the vertical direction of the hydraulic field.
3. The 3D printing-based nuclear fuel assembly spacer grid of claim 1, wherein: the middle part of the rigid-convex structure is provided with an elliptical hole so as to reduce the projection area of the rigid-convex structure in the vertical direction.
4. The 3D printing-based nuclear fuel assembly spacer grid of claim 1, wherein: the plate-shaped structure comprises a first plate-shaped main body (1-1), a second plate-shaped main body (2-1), a third plate-shaped main body (3-1) and a fourth plate-shaped main body (4-1), wherein a large-area hollowed-out area is arranged in the middle of the plate-shaped structure, circular arc-shaped grooves are formed in the edges of the plate-shaped structure, the circular arc-shaped grooves and other grid units form an ellipsoidal hollowed-out area, and the area of the hollowed-out part on the surface accounts for 52% of the area of an original rectangular plate body.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010867830.XA CN112071443B (en) | 2020-08-26 | 2020-08-26 | Nuclear fuel assembly spacer grid based on 3D prints |
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| CN202010867830.XA CN112071443B (en) | 2020-08-26 | 2020-08-26 | Nuclear fuel assembly spacer grid based on 3D prints |
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| CN112071443B true CN112071443B (en) | 2023-03-21 |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100432581B1 (en) * | 2001-07-10 | 2004-05-24 | 한국수력원자력 주식회사 | Spacer Grid for Uniform Conformal Contact with Fuel Rod and for Extending the Elastic Range of the Grid Spring |
| US10818402B2 (en) * | 2017-03-31 | 2020-10-27 | Westinghouse Electric Company Llc | Spacer grid using tubular cells with mixing vanes |
| CN206849509U (en) * | 2017-05-22 | 2018-01-05 | 岭东核电有限公司 | Fuel assembly and the screen work for fuel assembly |
| CN107195335B (en) * | 2017-05-22 | 2023-06-13 | 岭东核电有限公司 | Fuel assembly and method of assembling the same |
| CN111540481A (en) * | 2020-05-14 | 2020-08-14 | 吉林农业大学 | Stirring grid work based on additive manufacturing process |
| CN111524616B (en) * | 2020-05-14 | 2023-09-01 | 吉林农业大学 | Integral spacer grid based on additive manufacturing process |
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