Finite element analysis of irradiation-induced dilation of the fuel subassembly duct in LMFBR

GAO Fuhai FU Hao LI Nan YANG Kongli WANG Mingzheng

doi:10.11889/j.0253-3219.2013.hjs.36.040661

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Finite element analysis of irradiation-induced dilation of the fuel subassembly duct in LMFBR

更新时间：2021-06-03

- Finite element analysis of irradiation-induced dilation of the fuel subassembly duct in LMFBR
- NUCLEAR TECHNIQUES Vol. 36, Issue 4, Article number: 040661(2013)
- 作者机构：
  
  中国原子能科学研究院快堆工程部
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2013.hjs.36.040661
  CLC： TL351.1
- Published：2013
- 稿件说明：
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[1]高付海,付浩,李楠,杨孔雳,王明政.计入辐照效应的快堆燃料组件外套管截面变形有限元分析[J].核技术,2013,36(04):322-326.

GAO Fuhai FU Hao LI Nan YANG Kongli WANG Mingzheng. Finite element analysis of irradiation-induced dilation of the fuel subassembly duct in LMFBR[J]. Nuclear techniques, 2013, 36(4): 040661
[1]高付海,付浩,李楠,杨孔雳,王明政.计入辐照效应的快堆燃料组件外套管截面变形有限元分析[J].核技术,2013,36(04):322-326. DOI： 10.11889/j.0253-3219.2013.hjs.36.040661.

GAO Fuhai FU Hao LI Nan YANG Kongli WANG Mingzheng. Finite element analysis of irradiation-induced dilation of the fuel subassembly duct in LMFBR[J]. Nuclear techniques, 2013, 36(4): 040661 DOI： 10.11889/j.0253-3219.2013.hjs.36.040661.

摘要

快堆燃料组件外套管截面的辐照变形计算对快堆堆芯设计非常重要。本文研究考虑材料辐照蠕变和辐照肿胀效应

利用有限单元法计算外套管截面变形的方法。首先介绍了采用的辐照蠕变和辐照肿胀材料模型

其次给出了通过力学简化模型研究截面变形的理论方法

最后提出一种本构关系应力更新方案

通过将其编入ABAQUS子程序接口UMAT对外套管在压差作用下的截面变形进行了有限元分析计算

并比较讨论分析结果。结果表明有限元方法成功计算出了截面的变形

并在小变形时与理论解吻合较好。研究表明本文提出的本构关系应力更新方案是有效的;变形较大时理论解的偏差增大;内壁角点处应力水平最高

并伴随应力松弛效应。

Abstract

Background: The calculation of irradiation-induced dilation of the fuel subassembly duct in LMFBR is important for fast reactor core design.Purpose: To investigate how to calculate the dilation by using finite element method（FEM）.Methods: First

irradiation-induced creep and swelling material models are introduced.Then

a theoretical solution based on a simplified bending plate model is briefly given.Finally

a stress update scheme for the adopted material models is presented and furthermore embedded into ABAQUS user interface UMAT to conduct finite element analysis.Both solutions are compared and discussed.Results: FEM successfully predicts the duct dilation and its solution agrees well with theoretical one in small deformation.Conclusions: The proposed stress update scheme is effective.The accuracy of the theory solution declines when dilation becomes larger.The maximum stress occurs at the duct corner point

and the location has stress relaxation effect.

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