The analysis of vibration effects on the structure of Nuclear Fuel Assemblies was performed by using a 3-D finite element model. A 16×16 Standard Fuel Assembly design was used for this analysis. Since fuel assemblies have a nonlinear behavior during normal operation, due to the interaction between fuel rods and spacer grids, the methodology consisted basically of four steps: a modal analysis for obtaining the natural frequencies, a linear structural analysis for the no sliding stiffness calculation, a nonlinear structural analysis for the sliding stiffness calculation, and a correction factor estimate for natural frequencies obtained directly from the modal analysis. Also, it includes the major calculated stresses associated with the most external thimble tube.
- Nuclear Engineering Division
A Modal Analysis Procedure for PWR Fuel Assemblies
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Carrilho, LA, & de Gouveˆa, JP. "A Modal Analysis Procedure for PWR Fuel Assemblies." Proceedings of the 16th International Conference on Nuclear Engineering. Volume 4: Structural Integrity; Next Generation Systems; Safety and Security; Low Level Waste Management and Decommissioning; Near Term Deployment: Plant Designs, Licensing, Construction, Workforce and Public Acceptance. Orlando, Florida, USA. May 11–15, 2008. pp. 33-37. ASME. https://doi.org/10.1115/ICONE16-48125
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