M&C 2019 (The International Conference on Mathematics and Computational Methods applied to Nuclear Science and Engineering)
Abstract
The Superhomogenization method has been applied in the STREAM/RASTK code system for pin-by-pin calculation. The STREAM lattice code provides the reference solution and the pin cross-sections for the generation of the Superhomogenization factors, and these factors are then used to correct the cross-sections that will be used by the RASTK code for pin-by-pin calculations. To improve the accuracy for some applications, a multi-group transport option has been implemented in RASTK based on simplified spherical harmonics. The numerical results demonstrate the performance of the Superhomogenization method.