SONG—Development of Resonance Modules

The development of lattice code SONG is mainly for the research and development of new type reactors. The resonance calculation modules in the SONG code are applicable for pin-type and plate-type fuel elements, including Stamm’ler method and Spatially Dependent Dancoff Method（SDDM）. The Stamm’ler method is a traditional resonance calculation method based on equivalence theory, which is simple and efficient but unable to treat the space-dependent resonance shielding. Based on Stamm’ler method, SDDM method evaluates further the escape probability of different regions, thus to estimate the space-dependent self-shielding effect. Current theory of Stamm’ler method and SDDM are both for pin-type fuel element. While in the SONG code, the methods were extended for plate-type fuel element, and general resonance modules were developed. Numerical results indicate that the resonance theoretical derivation is appropriate and the accuracy of resonance modules is satisfied.