Abstract
ABSTRACT To increase the accuracy of Monte Carlo perturbation calculations, the main issue is to estimate the variations of fission source distribution in perturbed systems. For estimating the difference between effective multiplication factors in unperturbed and perturbed systems, this study proposes combining the fission matrix method and the correlated sampling method, and applying the weight window technique for stabilizing the weight fluctuation of fission sources in perturbed systems. By applying the proposed method to the Smart and User-frIendly Monte Carlo Particle Transport Code (SUIT) Monte Carlo code, perturbation calculations are carried out for GODIVA and for simplified STACY problems. The results thus estimated show good agreement compared with those of reference calculations, demonstrating that the proposed method can effectively estimate variations of fission source distribution in perturbed systems for improving the accuracy of Monte Carlo correlated sampling method, especially for large variations.
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