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Strip-lattice cell combined type positioning grid

A positioning grid and combined technology, which is applied in the direction of reactor fuel elements, reactors, and reduction of greenhouse gases, can solve the problems of increasing work load, etc., and achieve the effect of less molds, simple assembly, and simple structure

Pending Publication Date: 2020-07-31
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • 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

Method used

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  • Strip-lattice cell combined type positioning grid
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  • Strip-lattice cell combined type positioning grid

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Embodiment Construction

[0030] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0031] Such as figure 1 As shown in -5, the strip cell combined positioning grid of the present invention includes a cell 1, an outer strip 2, an inner strip 3, and a guide tube channel 4;

[0032] Several inner strips 3 are inserted and arranged to form a square or hexagonal structure, and a circle of outer strips 2 is welded and fixed around the square or hexagonal structure; cells 1 are welded to form a grid formed by intersecting inner strips 3 in space. According to the actual design requirements of the fuel assembly, several cells 1 are taken out as guide tube channels 4 , and the guide tubes are arranged in the guide tube channels 4 and fixed with the inner strip 3 .

[0033] When the inner strips 3 are inserted and arranged to form a square shape, the structure of the cells 1 can be a cylinder or a four-sided cylinder according to t...

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Abstract

The invention belongs to the technical field of fuel assemblies, and particularly relates to a strip-lattice cell combined type positioning grid. The positioning grid comprises lattice cells, an outerstrip and inner strips, wherein the plurality of inner strips are mutually spliced and arranged to form a square or hexagonal structure, and the outer strip in a circle form is welded and fixed around the square or hexagonal structure; and the lattice cells are welded in grid spaces formed by mutually inserting the inner strips. Planes or protrusions are machined at the cylinder corners of the lattice cell structure to serve as supporting structures to be used for supporting fuel rods at the opposite corners of grids, and the lattice cell structure is suitable for fuel assemblies with large rod diameters and small grid distances of the fuel rods. The clamping force of the supporting structure on fuel rods can be adjusted according to the design requirements of the fuel assembly by adjusting planes or bulges at the cylinder corners of the lattice cell structures; due to the adoption of the structural form that the inner strips are used as the frame, different lattice cell forms can beadopted in different lattices of the same positioning lattice frame, and the positioning grid is 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, and in particular relates to a strip cell combined 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C3/348G21C3/352G21C3/356
CPCG21C3/3566G21C3/352G21C3/348Y02E30/30
Inventor 邹远方史宝磊季松涛何晓军韩智杰刁均辉史晓磊
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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