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Compression system capable of effectively reducing axial load of fuel assembly and fuel assembly

A fuel assembly and axial load technology, applied in the direction of reactor fuel elements, assembly of fuel elements, reduction of greenhouse gases, etc., can solve problems affecting the structural integrity of fuel assemblies, fuel assembly jumping, etc., to increase thermal margin , Increase the flow rate, improve the effect of safety margin

Pending Publication Date: 2021-09-17
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The usual method is to reduce the spring stiffness of the compression system, but this method may cause the fuel assembly to jump due to insufficient compression force, thereby affecting the structural integrity of the fuel assembly

Method used

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  • Compression system capable of effectively reducing axial load of fuel assembly and fuel assembly
  • Compression system capable of effectively reducing axial load of fuel assembly and fuel assembly
  • Compression system capable of effectively reducing axial load of fuel assembly and fuel assembly

Examples

Experimental program
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Effect test

Embodiment 1

[0038] This embodiment proposes a compression system 6 that can effectively reduce the axial load of the fuel assembly. The compression system 6 is arranged at the lower part of the reactor fuel assembly to provide axial support and positioning for the fuel assembly.

[0039] Such as figure 1 As shown, the compression system 6 is composed of multiple sets of elastic elements installed at the lower end of the lower tube base 5 of the fuel assembly, and provides axial compression and support for the fuel assembly when the fuel assembly is loaded into the reactor.

[0040] The pressing system 6 of this embodiment can be realized by leaf springs, coil springs, disc springs, other elastic elements or combinations thereof.

[0041]The stiffness and stroke (range of deformation) of the compression system 6 of this embodiment should be adapted to the weight of the fuel assembly and its operating environment and parameters (temperature, pressure, coolant flow rate, stack cavity height,...

Embodiment 2

[0046] The difference between this embodiment and Embodiment 1 is that the elastic element used in the pressing system 6 of this embodiment is a helical spring, that is, the pressing system 6 of this embodiment consists of a group of helical springs installed at the lower end of the lower pipe seat 5 of the fuel assembly. Each set of helical springs is composed of one or several concentric helical springs; each set of helical springs can be provided with a guide device, and the compression load generated by the helical springs provides support for the bottom of the fuel assembly.

Embodiment 3

[0048] The difference between this embodiment and Embodiment 1 is that the elastic element used in the compression system 6 of this embodiment is a disc spring, that is, the compression system 6 of this embodiment is composed of an array of disc springs installed at the lower end of the lower pipe seat 5 , each group of disc springs is composed of one or several overlapping disc springs; each group of disc springs can be provided with a guide device, and the compression load generated by the disc springs provides support for the bottom of the fuel assembly.

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Abstract

The invention discloses a compression system capable of effectively reducing the axial load of a fuel assembly and the fuel assembly. The compression system is arranged at the lower part of the fuel assembly and provides axial support and positioning for the fuel assembly. According to the fuel assembly compression system, the axial compression load borne by the fuel assembly in a reactor can be remarkably reduced, bending of the fuel assembly can be relieved, the stress level borne by all parts is reduced, and the safety margin of the fuel assembly is improved.

Description

technical field [0001] The invention belongs to the technical field of fuel assemblies, and in particular relates to a pressing system and a fuel assembly which can effectively reduce the axial load of the fuel assemblies. Background technique [0002] In the design of PWR fuel assemblies, it is usually necessary to design an elastic compression system to compensate for the difference in manufacturing height of fuel assemblies, the difference in thermal expansion between fuel assemblies and between fuel assemblies and internal components, and the irradiation of fuel assemblies. growth so as to compress the fuel assembly axially and maintain its axial position. [0003] For the case where the coolant flows from the bottom to the top of the core, the design of the fuel assembly is usually provided with a compression system on the upper tube seat to compress it axially to prevent it from jumping up under the action of hydraulic load. The compression system will apply an axial ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C3/33
CPCG21C3/331Y02E30/30
Inventor 李云蒲曾坪张林陈平肖忠李华茹俊朱发文谷明非秦勉李权黄山
Owner NUCLEAR POWER INSTITUTE OF CHINA
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