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Guide tube connecting tube, upper tube seat and fuel assembly skeleton

A technology for guide tubes and connecting tubes, which is applied in the field of reactor fuel components, can solve problems such as easy loosening, difficult installation, and complicated connection structure between guide tubes and upper tube sockets, and achieve overall rigidity enhancement, convenient installation, and avoid welding problems of dissimilar materials Effect

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

[0005] The technical problem to be solved in the present invention is: the connection structure between the guide pipe and the upper pipe seat in the prior art is complex, difficult to install, and easy to loosen

Method used

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  • Guide tube connecting tube, upper tube seat and fuel assembly skeleton
  • Guide tube connecting tube, upper tube seat and fuel assembly skeleton
  • Guide tube connecting tube, upper tube seat and fuel assembly skeleton

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as image 3 As shown, the guide tube connecting tube 5 in this embodiment is a hollow cylinder with open upper and lower end faces, its inner diameter matches the outer diameter of the guide tube 4, and the lower part of the guide tube connecting tube 5 is expanded on the outside of the guide tube 4; The upper part of the pipe connecting pipe 5 is provided with several protrusions 6 along the circumferential direction.

[0035] Such as Figure 4 As shown, the upper pipe seat 1 in this embodiment includes a compression spring 8 and a pipe seat, and the compression spring 8 is fixed above the pipe seat. At the inner wall of the channel where the tube base needs to be connected to the guide tube 4, several chutes 7 are set, the starting end of the chute 7 is located at the opening of the channel on the lower end surface of the tube base, and the end of the chute 7 is closed inside the tube base; Groove 7 end is provided with spring 8, and spring 8 front is connected...

Embodiment 2

[0038] The connecting pipe 5 of the guide tube in this embodiment is evenly provided with 2 or 3 protrusions 6 along the circumferential direction, and the shape of the protrusions 6 can be a cuboid or a cylinder.

Embodiment 3

[0040] A fuel assembly skeleton in this embodiment includes a guide tube 4, a positioning grid, an upper tube base 1 and a lower tube base, and several guide tubes 4 run through the cells of the positioning grid from top to bottom. The upper end of 4 is fixedly connected with upper tube base 1, and the lower end of guide pipe 4 is fixedly connected with lower tube base. The guide tube 4 and the upper tube base 14 are connected by the connecting structure between the guide tube and the upper tube base in any one of the above-mentioned embodiments. Such as Figure 5-Figure 8 As shown, the cell 14 of the positioning grid is in the form of a four-sided cylinder, and upper slots are respectively provided on the four sides of the cell 14 for plugging in with the plug-in 21. The plug-in 21 includes a clamping part 15 and a plug-in The connecting portion 16 and the clamping portion 15 protrude toward the inner side of the cell 14 .

[0041] The insert 10 includes a corner insert 17 ...

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Abstract

The invention belongs to the technical field of reactor fuel assemblies, and concretely relates to a guide tube connecting tube, an upper tube seat and a fuel assembly skeleton. The guide tube connecting tube is a hollow cylinder with open upper and lower end surfaces, the internal diameter of the guide tube connecting tube is matched with the external diameter of a guide tube, the lower part of the guide tube connecting tube is in expanding connection with the external of the guide tube, and the upper part of the guide tube connecting tube is circumferentially provided with a plurality of protrusions; and the upper tube seat comprises a pressing spring and a tube seat, the inner wall of a channel, needing to be connected with the guiding tube, of the tube seat is provided with a pluralityof sliding slots, a spring is arranged at the end of every sliding slot, the front of the spring is connected with a blocking block, and a recess is arranged at a position, below the corresponding blocking block, of every sliding slot. The guide tube connecting tube has the advantages of simple structure, convenience in installation, effectiveness in solving of the problem of easy loosening between the guide tube and the upper tube seat in the prior art, and significant improvement of the safety and reliability of the fuel assembly.

Description

technical field [0001] The invention belongs to the technical field of reactor fuel assemblies, and in particular relates to a guide pipe connecting pipe, an upper pipe seat and a fuel assembly framework. Background technique [0002] The fuel assembly generally consists of an upper tube base, a lower tube base, a spacer grid, a guide tube and a fuel rod. The fuel assembly is located in the middle of the reactor chamber, and the coolant passes through the core and flows through the fuel rods, taking away the heat of reaction. [0003] The guide tube is an important structural part of the fuel assembly, which provides insertion channels for the control rods and neutron source rods. Usually a fuel assembly is provided with multiple guide tubes, the upper end of the guide tubes is connected to the upper tube base, and the lower end of the guide tubes is connected to the lower tube base. [0004] Such as figure 1 , figure 2 As shown, in the prior art, the connection assembl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C3/34G21C15/14
CPCY02E30/30
Inventor 何晓军史宝磊季松涛胡立强邹远方陈升
Owner CHINA INSTITUTE OF ATOMIC ENERGY