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Effects of Cladding Thickness and Its Heating on a Fuel Sphere Thermalhydraulics

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Document pages: 8 pages

Abstract: A numerical study of helium flow around a fuel sphere of 6 cm in diameter is carried out. This study is devoted to the effect of the cladding thickness variation on the cooling of a fuel sphere used in PBMR and HTR-PM nuclear reactors. The cladding thicknesses vary from 0.5 cm to 2 cm by step of 0.5 cm. The flow is maintained at the constant Reynolds number of 2750. An equation set-up based on the conservation equations of continuity, momentum and energy is done. Turbulence is modeled by the two-equation k-epsilon model. The system of equations thus established is solved, using the code FLUENT, on a three-dimensional mesh already defined and validated. The obtained results are presented and discussed. For the four cladding thicknesses, it appears that the 0.5 cm one is the one that remains the most adequate. It combines cooling performances and optimal diameter of the fuel sphere.

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