Monte Carlo codes that use a linear search to determine which tally bins need to be scored in each tracking step suffer severe performance penalties when tallying a large number of quantities. This paper proposed a new tally method based on the hierarchical geometry tree. This method determines where to store the tally contribution by tracking down the tree. For the same reactor model, the average active cycle execution time of tallying 6 million fuel pin segments increased about 4% compared with inactive cycles. This method has been implemented in the CAD-based Monte Carlo code SuperMC.
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