Volume 12, Issue 1 (4-2022)                   JEM 2022, 12(1): 158-169 | Back to browse issues page

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Talebi M, Hatami A. Analysis of Unsteady Fluid Induced Vibration Forces on a Nuclear Fuel Rod Bundle in Turbulent Axial Flow. JEM. 2022; 12 (1) :158-169
URL: http://energy.kashanu.ac.ir/article-1-1419-en.html
Nuclear Science and Technology Institute
Abstract:   (1059 Views)
At a nuclear power plants a set of fuel rods held together by spacer grids form a fuel bundle. The coolant flow passing around the rods and the resulting flow turbulence, especially around the spacer grids, exerts transverse, vibrational, and unsteady forces on the rods. The periodic tensions generated by these vibrations will result in fatigue and the reduced mechanical strength of the rods as well as the erosion and the corrosion of the rod clad. In this study, these forces are analyzed in terms of magnitude, amplitude, and intensity of oscillations. To identify the effect of mixing vanes on the spacer grids, simulations were performed for spacer grids both with/without vanes. The obtained results are in good agreement with experimental results. Results showed a 17% increase in pressure drop due to the presence of mixing vanes. The forces exerted to the spacer in the downstream are 10% less than the forces in upstream. Analyses of the fluctuations of the forces applied to the fuel rod bundle showed the amplitude of the vibrations is relatively high at frequencies below 300 Hz.
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Type of Study: Research | Subject: Mechanical Engineering
Received: 2019/12/29 | Revised: 2022/06/15 | Accepted: 2020/12/2 | Published: 2022/03/1

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