Annular fuel assembly positioning grid
A technology for positioning grids and fuel assemblies, which is applied in the direction of reactor fuel elements, reactors, and reduction of greenhouse gases, etc., can solve the problems of increasing work load, etc., and achieve the effects of less molds, simple assembly, and simple structure
Pending Publication Date: 2020-07-31
CHINA INSTITUTE OF ATOMIC ENERGY
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- Description
- Claims
- Application Information
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Problems solved by technology
After the mold is determined, if you want to change the characteristics of the spacer grid, such as flow resistance, to have a better effect on the distribution of coolant between fuel assemblies, etc., you need to change the shape of almost all the molds, which greatly increases the workload
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[0031] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0032] Such as figure 1 As shown in -2, the annular fuel assembly positioning grid of the present invention includes a support member 1, an outer strip 2, an inner strip 3, and a guide pipe channel 4; several inner strips 3 are inserted and arranged to form a square or hexagon Shaped grid structure, a square or hexagonal grid structure is welded and fixed with a circle of outer strips 2 around; the support 1 is arranged at the intersection of the inner strips 3 .
[0033] Such as image 3 - As shown in -5, the support 1 is octagonal, including a variety of structural forms: it can be an integral structure, or spliced by two parts, or spliced by four parts; when the support 1 is composed of two parts or When the four parts are spliced together, a hook 12 is arranged on it for assembly. The four sides of the octagon are provided with s...
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The invention belongs to the technical field of fuel assemblies, and particularly relates to an annular fuel assembly positioning grid. The annular fuel assembly positioning grid comprises supportingpieces, an outer strip and inner strips, wherein the plurality of inner strips are mutually spliced and arranged to form a square or hexagonal grid structure, and the outer strip in a circle form is fixedly welded at the periphery of the square or hexagonal grid structure; the supporting pieces are disposed at intersections of the inner strips; and the supporting pieces are octagonal. The octagonal supporting pieces are provided with rigid protrusions or springs to serve as supporting structures, are used for supporting fuel rods at the opposite corners of the grids and are suitable for fuel assemblies with large rod diameters and small grid distances of the fuel rods. The clamping force of the octagonal supporting pieces on the fuel rods can be adjusted according to the design requirementof the fuel assembly by adjusting the rigid protrusions or the springs of the octagonal supporting pieces. Because the rigid protrusions or the springs arranged on the octagonal supporting pieces canbe adjusted, the annular fuel assembly positioning grid can be suitable for a situation that fuel rods with different rod diameters are adopted in the same fuel assembly.
Description
technical field [0001] The invention belongs to the technical field of fuel assemblies, in particular to an annular fuel assembly positioning grid. Background technique [0002] During the operation of a nuclear power plant reactor, the performance of nuclear fuel is an important factor affecting the safety and economy of the reactor. Therefore, the research of fuel elements has been placed in a very prominent position in the world. By optimizing the design of fuel elements, adopting advanced structural materials, and improving the manufacturing process of elements, the various performances of nuclear fuel elements are continuously improved, and nuclear power is promoted to be safer and more efficient. direction of economic development. [0003] In the existing PWR fuel assembly design, the fuel rods are generally clamped and suspended by spacer grids. The positioning grid plays the role of supporting and clamping the fuel elements, and needs to resist the gravity of the f...
Claims
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Login to View More IPC IPC(8): G21C3/352G21C3/348G21C3/356
CPCG21C3/348G21C3/352G21C3/3566Y02E30/30
Inventor 史宝磊何晓军季松涛邹远方韩智杰李思远刁均辉
Owner CHINA INSTITUTE OF ATOMIC ENERGY