抄録
With the development of lattice physics calculation, the requirement for efficiency and geometry adaptability of resonance self-shielding treatment has become increasingly exigent. To handle this problem, the subgroup method is applied in this work. Combined with method of characteristics, subgroup fixed source problems are solved to obtain subgroup fluxes and an equivalence cross sections is added to the background cross sections to deduce the final effective cross sections. For resonance interference effect, the Bondarenko iteration process is introduced and a set of resonance category is adopted to reduce the load of computations. In addition, a parallel scheme based on region decomposition is carried out to improve efficiency. A series of benchmark problems are solved for verification and the numerical results show that this work has a good performance to provide resonance cross sections for multiple resonant region and complicated materials accurately and effectively.
