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Lattice cell, fuel assembly positioning grid and fuel assembly

A technology for positioning grids and fuel assemblies, applied in the directions of reactor fuel elements, fuel element assembly, nuclear power generation, etc., can solve problems such as increasing workload, and achieve the effects of avoiding damage, preventing up and down movement, and fully contacting

Pending Publication Date: 2019-06-25
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Lattice cell, fuel assembly positioning grid and fuel assembly
  • Lattice cell, fuel assembly positioning grid and fuel assembly
  • Lattice cell, fuel assembly positioning grid and fuel assembly

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] like figure 1 As shown, cell 1 is a four-sided cylinder, including cylinder corners and cylinder walls, and a plane is processed at the cylinder corners. Rigid protrusions 2 are provided on the cylinder angle plane of the cell 1 .

[0057] The rigid protrusions 2 are elliptical and protrude toward the inner side of the cell 1 along the height direction of the cell 1 to form a line contact with the fuel element.

[0058] An inclined upper guide surface 4 is provided above the rigid protrusion 2, and an inclined lower guide surface 5 is provided below the rigid protrusion 2 to make a smooth transition between the rigid protrusion 2 and the cell wall of the cell 1, and facilitate the insertion of fuel elements.

[0059]An upper convex portion 3 is provided above the upper guide surface 4 for controlling the flow rate of the coolant and producing a certain mixing effect on the coolant. The raised portion 3 protrudes toward the outside of the cell 1 . The protruding range...

Embodiment 2

[0066] Cell 1 is a four-sided cylinder, including cylinder corners and cylinder walls, and a plane is processed at the cylinder corners. Rigid protrusions 2 are provided on the cylinder angle plane of the cell 1 .

[0067] like Figure 4 As shown, the rigid protrusion 2 is elliptical and protrudes toward the inner side of the cell 1 along the height direction of the cell 1 to form a line contact with the fuel element.

[0068] An inclined upper guide surface 4 is provided above the rigid protrusion 2, and an inclined lower guide surface 5 is provided below the rigid protrusion 2 to make a smooth transition between the rigid protrusion 2 and the cell wall of the cell 1, and facilitate the insertion of fuel elements.

[0069] A cell-type fuel assembly positioning grid is composed of cell 1 arrays. The cells 1 are connected in pairs and fixed by spot welding to form a 3x3 positioning grid.

[0070] Take out the cell 1 at the center of the cell arrangement, and use the vacant p...

Embodiment 3

[0075] Cell 1 is a four-sided cylinder, including cylinder corners and cylinder walls, and a plane is processed at the cylinder corners. Rigid protrusions 2 are provided on the cylinder angle plane of the cell 1 .

[0076] The rigid protrusions 2 are elliptical and protrude toward the inner side of the cell 1 along the height direction of the cell 1 to form a line contact with the fuel element.

[0077] An inclined upper guide surface 4 is provided above the rigid protrusion 2, and an inclined lower guide surface 5 is provided below the rigid protrusion 2 to make a smooth transition between the rigid protrusion 2 and the cell wall of the cell 1, and facilitate the insertion of fuel elements.

[0078] An upper convex portion 3 is provided above the upper guide surface 4, and a lower convex portion 9 is arranged symmetrically with the upper convex portion 3 below the lower guide surface 5, which is used to control the flow rate of the coolant and generate a certain amount of mix...

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Abstract

The invention relates to the technical field of fuel assemblies, and concretely discloses a lattice cell, a nuclear reactor fuel assembly positioning grid and a fuel assembly. The lattice cell is a four-sided cylindrical shell, the four-sided cylindrical shell comprises cylinder corners and a cylinder wall, every cylinder corner is provide with a plane, and every cylinder corner plane of the lattice cell is provided with a rigid projection; the positioning grid is formed by arranging the lattice cells; and the fuel assembly comprises the positioning grid. The positioning grid is suitable for an annular fuel element to provide lateral positioning for the fuel element and play a role in certain stirring and mixing of a coolant, and the lattice cell is provided with the projections with different projecting amplitudes to adjust the positioning grid to a required flow resistance.

Description

technical field [0001] The invention belongs to the technical field of fuel assemblies, and in particular relates to a cell, a fuel assembly positioning grid and a fuel assembly. 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C3/34G21C3/344
CPCY02E30/30
Inventor 史宝磊何晓军张爱民季松涛
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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