Abstract
The effect of anisotropic scattering has been studied in UO2 and MOX fueled LWR cells and cores. The effect is negligibly small for UO2 fueled cells, but the effect is remarkable for the MOX fueled cells and cores. For the MOX fuel cells, the anisotropic effect decreases kinf by 0.15 ∼ 0.23% Δk/k depending on the moderator to fuel volume ratio. For small UO2 and MOX cores, the anisotropic scattering leads to the flux peaking in water reflectors, and the increase of neutron absorption in the reflector decreases keff remarkably.
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