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Positioning grid and fuel assembly

A technology for positioning grids and grids, applied in the field of nuclear reactors, can solve the problems of large tensile stress of guide tubes, reduced straightness of fuel rods, large impact force, etc., so as to reduce the stress of guide tubes, reduce component growth, and ensure lateral stiffness. Effect

Active Publication Date: 2020-05-22
LINGAO NUCLEAR POWER +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, for fixedly connected spacer grids and guide tubes, the guide tubes are subjected to large tensile stress at the beginning of life, which accelerates the growth of components, and at the same time, the growth of fuel rods is constrained by the spacer grids, which may reduce the straightness of fuel rods
For floating-connected spacer grids and guide tubes, the lateral stiffness of fuel assemblies is low, and fuel assembly bending is prone to occur under normal operating conditions. In earthquakes and other accident conditions, the spacer grids are subject to greater impact force, threatening fuel rods. cooling

Method used

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  • Positioning grid and fuel assembly
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  • Positioning grid and fuel assembly

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Embodiment Construction

[0032] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0033] Such as Figure 1-Figure 3 As shown, the positioning grid according to an embodiment of the present invention includes two grid units 10 and a clamping unit 20 . The two grid units 10 are set opposite to each other up and down, and are divided into upper and lower layers; the clamping unit 20 is inserted between the two grid units 10, and can move up and down relative to the grid units 10, forming a gap between the grid units 10. Floating connection, in fuel assemblies, reduces guide tube stress, prevents fuel rod bending, and reduces assembly growth.

[0034] Such as image 3 , Figure 4 As shown, each grid unit 10 may comprise a plurality of parallel spaced first strips 11 and a plurality of parallel spaced ...

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Abstract

The invention discloses a positioning grid and a fuel assembly. The positioning grid includes two grid units and a clamping unit; between the grill units and can move up and down relative to the grill units. The positioning grid of the present invention can reduce the stress of the guide tube in the fuel assembly, reduce the growth of the assembly, ensure the lateral rigidity of the fuel assembly, prevent the bending of the fuel assembly and the difficulty of inserting the control rods during normal operation, and improve the strength of the positioning grid and prevent accidents. The stability of the coolant circulation channel under certain conditions.

Description

technical field [0001] The invention relates to the technical field of nuclear reactors, in particular to a positioning grid and a fuel assembly. Background technique [0002] In the fuel assembly, the fuel rods are clamped in the framework by the elastic components in the spacer grid. The traditional positioning grid usually consists of two strips intersecting in orthogonal directions to form an egg crate structure, and each cell of the egg crate has an elastic clamping part. These elastic clamping parts are usually stamped on the strip itself, and some are fixed on the strip by welding or other methods. The characteristic of the traditional positioning grid is that there is no relative movement between the elastic clamping parts in the cells and the strips. [0003] The skeleton is formed by connecting the positioning grid and the control rod guide tube. There are two main types of connection between the spacer grid and the control rod guide tube: 1) fixed connection, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C3/34G21C3/356
CPCG21C3/34G21C3/356Y02E30/30G21C3/352
Inventor 庞铮铮张玉相李伟才冀士哲
Owner LINGAO NUCLEAR POWER