Method for Resonance Elastic Scattering Correction in Deterministic Method

The asymptotic scattering kernel is applied in NJOY to solve the slowing down equation, where the resonance elastic scattering is neglected. This assumption contributes considerable errors to eigenvalue and Doppler Coefficient（DC）. To take this effect into account in deterministic method, the Doppler Broadening Rejection Correction（DBRC） method is employed to correct the free gas model of MCNP, which is used to generate the resonance integral tables instead of NJOY. The infinite medium multiplication factor and DC of Light Water Reactor（LWR） are analyzed based on the subgroup method and the results are compared with those of MCNP. The numerical results show that the correction method proposed in this paper can be used to consider the resonance elastic scattering and promote the precision of the deterministic method.