Abstract
Fuel bundles in CANDU (Canada Deuterium Uranium) reactors are subject to axial flow-induced vibrations. This could result in fretting wear in the inner surface of the pressure tube or in the integrity of the bundles being compromised. Various fluid excitations can affect the dynamic response of the fuel bundle. One of these excitations is the fluid forces produced by the motion of the fuel rods. These forces can be expressed in terms of inertia, stiffness, and damping components. A numerical approach was proposed to simulate these forces in a flexible fuel kernel. These forces were expressed in terms of coefficients and phases. In addition, an analytical model was developed utilizing the force coefficients to predict the dynamic response of the fuel bundle. The dynamic response was compared with the available experimental data. The numerical model developed in this work presents a step towards a realistic framework to simulate the dynamic response of CANDU fuel bundles.
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