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Abstract
A significant effect of spacer gratings exerted on the dynamic characteristics of the covered fuel-element assemblies is shown. The calculated and experimental values of the added mass in the course of the bending vibrations of a bundle of fuel elements (fuel elements) are in good agreement between each other only when taking into account the flow of liquid in a narrow gap between the hexahedral surface of the spacer gratings and the hexahedral border of the cover of fuel-element assemblies. The small dimensions inherent in the spacer gratings in the axial direction of fuel-element assemblies lead to uneven distribution of the added mass along the length of the fuel-element assemblies, which is a significant factor in the study of bending oscillations of a bundle of fuel elements in liquid.
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