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Sensitivity and Uncertainty Analysis of FMD Model Choice for a Generic Crystalline Repository

Brooks, Dusty M.; Swiler, Laura P.; Mariner, Paul M.; Portone, Teresa P.; Basurto, Eduardo B.; Leone, Rosemary C.

This paper applies sensitivity and uncertainty analysis to compare two model alternatives for fuel matrix degradation for performance assessment of a generic crystalline repository. The results show that this model choice has little effect on uncertainty in the peak 129I concentration. The small impact of this choice is likely due to the higher importance of uncertainty in the instantaneous release fraction and differences in epistemic uncertainty between the alternatives.