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Monte Carlo analysis of doppler reactivity coefficient for UO$$_2$$ pin cell geometry

Nagaya, Yasunobu

Monte Carlo analysis has been performed to investigate the impact of the exact resonance elastic scattering model on the Doppler reactivity coefficient for the UO$$_2$$ pin cell geometry with the parabolic temperature profile. As a result, the exact scattering model affects the coefficient similarly for both the flat and parabolic temperature profiles; it increases the contribution of uranium-238 ($$^{238}$$U) resonance capture in the energy region from $$sim$$16 eV to $$sim$$150 eV and does uniformly in the radial direction. Then the following conclusions hold for both the exact and asymptotic resonance scattering models. The Doppler reactivity coefficient is well reproduced with the definition of the effective fuel temperature (equivalent flat temperature) proposed by Grandi et al.

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