Development and Preliminary Verification of Multi-Group Cross Section Processing Code MAGIC for Fast Reactor Based on Continuous Point Cross Section

Abstract

Abstract To meet the needs of fast reactor high precision nuclear data processing, a high precision multi-group cross section processing program MAGIC based on continuous point cross section is developed, which can provide accurate multi-group cross section for fast reactor deterministic program. The MAGIC program uses 1/120 lethargy width to divide the energy interval, and a total of 2082 energy groups are divided in 0.414eV∼14.2MeV for fast reactor energy region. The main functions of the program are as follows: (1) by using the problem dependent neutron spectrum, the effect of resonance interference can be well considered. (2) The resonance self-shielding factor iteration method can be used to better consider the interaction of the resonance self-shielding in the resolved and unresolved resonance energy regions of multiple nuclides. (3) When calculating the elastic scattering matrix, the resonance phenomenon is considered in the one-dimensional elastic scattering cross section, and the prefabricated scattering transfer probability table can greatly improve the calculation efficiency of the scattering matrix under the ultra-fine group energy framework on the premise of maintaining the accuracy. In terms of benchmark verification, the effective increment coefficient was verified by fast energy spectrum critical benchmark based on the multi-group cross section generated by MAGIC. The difference between the calculated results and those of the Monte Carlo program and NJOY was small, which preliminatively verified the effectiveness of the multi-group cross section generated by MAGIC program in the calculation of deterministic method.