Preliminary study on the improvement on the conventional resonance calculation method

It is well-established in reactor physics calculations that problem-dependent effective resonance cross-sections for a heterogeneous system are generated by applying the equivalence theory via interpolating the pre-generated resonance integral table for homogeneous systems. In order to address the defects of this method for the treatment of spatial effect and resonance interference effect,we propose an effective but simple improvement by introducing an additional correction factor. By virtue of the two resonance self-shielding calculation modules of the SCALE package, i.e., CENTRM and NITAWL, we demonstrate that the introduced correction factor changes monotonically with the number density ratio between moderator and nuclear fuel, which will greatly facilitate the future application of this factor and makes the proposed improvement more promising. (authors)