AN APPROACH FOR ASSESSING FUEL ASSEMBLY'S STRUCTURAL INTEGRITY UNDER IN-CORE OPERATING CONDITIONS USING FINITE ELEMENT METHOD

机译：基于有限元法的核内作业条件下燃料组件结构完整性评估方法

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This paper describes the development and application of a single fuel assembly (FA) finite element analysis (FEA) model that can be used to assess and predict the structural behavior of FA during its entire life at early design stage. This model includes all structural components of a FA and has been validated under laboratory test conditions, including spacer grid test under axial load, skeleton test under axial and lateral load, FA test under axial and lateral load, as well as the fuel rod drag test. The model is then applied to an example FA design by predicting the FA's in-core behavior, including its growth characteristics due to irradiation, and irradiation-induce creep and hydrogen absorption; effect of spring force relaxation of structural spacer grids; effect of holddown spring force increase with growth; effect of different amounts of initial FA bow and bowed shapes; FA distortion evolution vs. burnup history; and stress and deformation of various structural components.It demonstrates that this approach can be used to assess fuel assembly's structural behavior under various operating conditions at early design stage.

机译：本文介绍了单燃料组件（FA）有限元分析（FEA）模型的开发和应用，该模型可用于评估和预测FA在其整个生命周期的早期设计阶段的结构行为。该模型包括FA的所有结构组件，并已在实验室测试条件下进行了验证，包括轴向载荷下的隔栅测试，轴向和侧向载荷下的骨架测试，轴向和侧向载荷下的FA测试以及燃料棒阻力测试。然后，通过预测FA的核内行为（包括由于辐照引起的生长特性以及辐照导致蠕变和氢吸收），将该模型应用于示例FA设计。结构隔栅的弹簧力松弛效果;压紧弹簧力的作用随着增长而增加;不同数量的初始FA弓和弓形的影响; FA畸变演变与燃尽历史的关系;以及各种结构部件的应力和变形。它表明，该方法可用于在设计初期评估各种操作条件下的燃料组件的结构性能。

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《International conference on nuclear engineering;ICONE17》|2009年|P.181-186|共6页
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Wei Zhao; Yuriy Aleshin;
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AN APPROACH FOR ASSESSING FUEL ASSEMBLY'S STRUCTURAL INTEGRITY UNDER IN-CORE OPERATING CONDITIONS USING FINITE ELEMENT METHOD

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