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Spacer grid spring for increasing the conformal contact area with fuel rod

一种定位格架、燃料棒的技术，应用在燃料元件的组装、反应堆燃料元件、核能发电等方向，能够解决加速微振磨损等问题

Inactive Publication Date: 2007-10-17
KOREA ATOMIC ENERGY RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nuclear fuel rods vibrate under the action of turbulence caused by coolant flow, which accelerates fretting wear

Method used

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  • Spacer grid spring for increasing the conformal contact area with fuel rod
  • Spacer grid spring for increasing the conformal contact area with fuel rod
  • Spacer grid spring for increasing the conformal contact area with fuel rod

Examples

Experimental program
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Embodiment Construction

[0043] Reference will now be made in more detail to exemplary embodiments of the present invention, which are illustrated in the accompanying drawings. Whenever possible, the same reference numerals will be used to indicate the same or similar parts throughout the drawings and the description.

[0044] Fig. 6 is a perspective view illustrating a grid strip having a positioning grid spring that increases a conformal contact area with a nuclear fuel rod according to an embodiment of the present invention. Fig. 7 is a front view illustrating a grid strip with a grid spring according to an embodiment of the present invention, wherein the grid spring increases the conformal contact area with the nuclear fuel rod. Fig. 8 is a plan view illustrating a grid strip having a grid spring according to an embodiment of the present invention, wherein the grid spring increases a conformal contact area with a nuclear fuel rod. Figure 9 is a perspective view schematically illustrating a unit of the...

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PUM

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Abstract

A grid strap includes a spacer grid spring that increases the conformal contact area with a fuel rod of a nuclear fuel rod assembly. The shape of the spacer grid spring of the grid strap which is in contact with the fuel rod is optimized, thereby the elasticity of the spacer grid spring contacting the fuel rod is increased, the conformal contact area with a contact portion of the spacer grid spring contacting the fuel rod when the fuel rod is inserted into each cell of a spacer grid is expanded to obtain uniform stress distribution, and excessive plastic deformation of the spacer grid spring can be reduced. Further, magnitude and distribution of contact pressure between the fuel rod and the spacer grid spring are improved, thereby reducing the possibility of fretting wear caused by contact between the fuel rod and the spacer grid spring. The elastic behavior region of the spacer grid spring is expanded, so that the fuel rod can be reliably supported until the lifetime of the fuel rod expires despite changes in the supporting conditions of the fuel rod.

Description

Technical field [0001] The present invention relates to a positioning grid spring that increases the conformal contact area with a fuel rod. More specifically, the present invention relates to a positioning grid spring that increases the conformal contact area with a fuel rod. The positioning grid springs of the grid strips in contact with the fuel rods are optimized in shape, so that the elasticity of the positioning grid springs that contact the fuel rods is improved. When the fuel rods are inserted into each unit of the positioning grid springs At the same time, the conformal contact area of ​​the contact part with the spring of the fuel rod is enlarged to achieve a uniform stress distribution, and the excessive plastic deformation of the spring of the fuel rod can be reduced, and the fuel rod The amplitude and distribution of the contact pressure with the spring of the positioning grid is improved, thereby reducing the possibility of fretting wear caused by the contact between...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C3/34
CPCG21Y2004/30G21Y2002/303G21Y2002/206G21C3/356Y02E30/40G21Y2002/201Y02E30/30G21C3/34
Inventor 宋基男尹庆镐宋根禹李康禧朴景镇
Owner KOREA ATOMIC ENERGY RES INST
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