Reactivity-equivalent physical transformation for homogenization analysis of double-heterogeneous fuel and burnable poison

The traditional volumetric homogenization method on fuel and burnable poison with double heterogeneity will bring a certain calculation derivation. In the paper, from the DH (Double Heterogeneous) inequality criterion, the relationship between the calculation deviation of volumetric homogenization method and various factors on the dispersed particle-type fuel and burnable poison are analyzed. It is pointed out that for high enrichment or large size fuel particles and all type of burnable poisons, the traditional volumetric homogenization method will bring a certain calculation deviation. And then RPT (Reactivity-Equivalent Physical Transformation) method was used to treat dispersed particle-type fuel and burnable poison, the results show that the RPT method can be used to treat the dispersed particle-type fuel and burnable poison with relatively not too large absorption cross section which have double heterogeneity, and the calculation accuracy is similar to that of the grain model. (author)