A High Stability Fuel Assembly Compression System with Variable Stiffness and Low Irradiation Relaxation

A fuel assembly, high stability technology, applied in the field of pressing system, can solve problems such as insufficient pressing force, reduced spring pressing force, easy radiation relaxation, etc., to reduce axial load and stress level, and reduce bending Deformation, reducing the effect of structural materials

Active Publication Date: 2018-09-11
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention mainly solves the problem that there is a large stress inside the spring when the existing pressing system is in operation, which leads to easy radiation relaxation, thereby reducing the pressing force of the spring, and the problem of insufficient pressing force in the middle and late stages of the life of the fuel assembly, and provides a solution A High Stability Fuel Assembly Compression System with Variable Stiffness and Low Irradiation Relaxation for the Problems Above

Method used

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  • A High Stability Fuel Assembly Compression System with Variable Stiffness and Low Irradiation Relaxation
  • A High Stability Fuel Assembly Compression System with Variable Stiffness and Low Irradiation Relaxation
  • A High Stability Fuel Assembly Compression System with Variable Stiffness and Low Irradiation Relaxation

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Experimental program
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Embodiment 1

[0039] A high-stability fuel assembly compression system with variable stiffness and low radiation relaxation, such as figure 1 , figure 2 with image 3 As shown, it includes a leaf spring set 1 installed on the tube base 2 and a coil spring set 3 installed in the tube base 2 . In the present invention, the plate spring assembly 1 is installed on the fuel assembly pipe seat 2, which can be the upper pipe seat at the upper end of the fuel assembly, or the lower pipe seat at the lower end. In this embodiment, the above pipe seat is taken as an example.

[0040] Such as figure 2 As shown, the leaf spring group 1 includes an A leaf spring 11 stacked from top to bottom and more than one B leaf spring 12. The A leaf spring 11 consists of a horizontal section, an inclined arm and a vertical The B plate spring is composed of a horizontal section and an inclined arm. The end of the inclined arm of the B plate spring is provided with a window for the vertical arm to pass through. T...

Embodiment 2

[0049] The difference between this embodiment and Embodiment 1 is that this embodiment optimizes the structure of the helical spring group 3, and the specific settings are as follows:

[0050] The coil spring group 3 includes a compression rod 31 that runs through the tube base 2 , a compression cap 32 that is arranged on the compression rod 31 and is located at the top end of the tube base 2 , and is sleeved on the compression rod 31 and is located inside the tube base 2 . The spiral outer spring 33 below the pressure cap 32; the pressure rod 31 below the pressure cap 32 in the tube seat 2 is also provided with a step, and the preset inner spring 34 is arranged between the step and the pressure cap 32, and the preset inner The spring is located inside the helical outer spring 33 . In this embodiment, the preset inner spring 34 is a helical spring, such as Figure 5 shown.

Embodiment 3

[0052] The difference between this embodiment and Embodiment 2 is that the setting of the preset inner spring 34 in this embodiment is different, and the preset inner spring 34 is a disc spring in this embodiment, such as Image 6 shown.

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Abstract

The invention discloses a high-stability fuel assembly pressing system with variable stiffness and low radiation relaxation, which solves the problem that there is a large stress inside the spring when the existing pressing system is in operation, which leads to easy radiation relaxation, and further reduces the spring pressing force. Reduced, there is the problem of insufficient pressing force in the middle and late stages of the fuel assembly life. The present invention includes several spring groups installed on the pipe base (2), and is characterized in that a preset spring is added in the spring group, and the preset spring is in a natural state when the fuel assembly is running normally in thermal state. The preset spring is in a compressed state when the assembly is subject to a transient external load and is about to jump or after fuel assembly burn-up deepens. The invention has the advantages of reducing the bending deformation of the fuel assembly during operation, improving the operation stability and service life of the fuel assembly, and the like.

Description

technical field [0001] The invention relates to a pressing system, in particular to a high-stability fuel assembly pressing system with variable stiffness and low radiation relaxation. Background technique [0002] Existing reactor fuel assemblies usually consist of a number of fuel rods, guide tubes, spacer grids, lower tube base parts, and tube base parts containing a compression system, such as figure 1 shown. The compression system is arranged on the top of the fuel assembly, axially compresses the fuel assembly, keeps it in contact with the lower core plate, and compensates for the radiation growth of the fuel assembly and the thermal expansion difference of the fuel assembly relative to the internal components. [0003] The fuel assembly pressing system of the conventional technology is composed of several groups of spring groups symmetrically installed on the top of the pipe seat, such as figure 1 shown. Taking the leaf spring compression system as an example, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C3/33
CPCG21C3/331Y02E30/30
Inventor 蒲曾坪张吉斌庞华齐敏陈平朱发文黄春兰李云陈杰
Owner NUCLEAR POWER INSTITUTE OF CHINA
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