Subplane collision probabilities method applied to control rod cusping in 2D/1D

Each method was applied to a variety of problems. Results were compared to fine mesh solutions which had no axial heterogeneity and to Monte Carlo reference solutions generated using KENO-VI. It was shown that the polynomial decusping method was effective in many cases, but it had some limitations, with 3D pin power errors as high as 25% compared to KENO-VI. The subplane collision probabilities method performed much better, lowering the maximum pin power error to less than 5% in every calculation.