核安全2024，Vol.23Issue(6)：69-76,8.
芯块偏心致周向非均匀传热对SiC燃料棒弯曲特性影响研究
Investigation on the Influence of Circumferential Non-uniform Heat Transfer Resulted by Eccentricity of Pellets on Bending Characteristics of SiC Fuel Rod
卢志威 1廖业宏1
作者信息
- 1. 中广核研究院有限公司,深圳 518026
- 折叠
摘要
Abstract
For fuel rods based on silicon carbide composite cladding,the pellet is prone to eccentricity in the cladding,leading to non-uniform heat transfer and temperature distribution around the fuel rod,resulting in non-uniform thermal expansion and radiation swelling around the cladding,ultimately leading to bending of the fuel rod.In this paper,the above phenomena are quantitatively studied.The results show that the eccentricity of pellets leads to higher temperature on the contact side of SiC cladding than on the separation side,resulting in a significant non-uniform circumferential temperature distribution;In the free state,at beginning of life,the SiC cladding bends towards the separation side,and as the SiC irradiation swelling gradually accumulates,it bends towards the contact side at end of life.Grid spacer clamping will significantly reduce the bending amount of SiC cladding;Grid spacer clamping has little effect on the circumferential stress of SiC cladding,but reduce the axial stress of each layer of SiC cladding on the separation side and increase the axial stress of each layer of SiC cladding on the contact side.关键词
SiC/包壳/周向/非均匀/弯曲Key words
SiC/cladding/circumferential/non-uniform/bending分类
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卢志威,廖业宏..芯块偏心致周向非均匀传热对SiC燃料棒弯曲特性影响研究[J].核安全,2024,23(6):69-76,8.
