Impact Analysis for the Egg-Crate Structure of a Nuclear Fuel Assembly by Using FEM
A spacer grid assembly is one of the main structural components of the nuclear fuel assembly of a Pressurized light Water Reactor (PWR). The spacer grid assembly supports and aligns the fuel rods, guides the fuel assemblies past each other during a handling and, if needed, sustains lateral seismic loads. The ability of a spacer grid assembly to resist these lateral loads is usually characterized in terms of its dynamic and static crush strengths, which are acquired from tests. In this study, a finite element analysis on the dynamic crush strength of spacer grid assembly specimens is carried out. Comparisons show that the analysis results are in good agreement with the test results within an 8 % difference range. Therefore, we could predict the crush strength of a spacer grid assembly in advance, before performing the dynamic buckling test. And also a parametric study on the crush strength of a spacer grid assembly is carried out by adjusting the weld penetration depth for a sub-sized spacer grid, which also shows a good agreement between the test and analysis results.
Yu Zhou, Shan-Tung Tu and Xishan Xie
K. N. Song et al., "Impact Analysis for the Egg-Crate Structure of a Nuclear Fuel Assembly by Using FEM", Key Engineering Materials, Vols. 353-358, pp. 2668-2671, 2007