Performance Assessment Modeling for Savannah River Glass HLW Disposal in a Potential Repository at Yucca Mountain
Performance assessment (PA) simulates the long-term performance of a conceptual geological repository for nuclear waste or the performance of a subsystem such as the engineered barrier system (drifts, waste packages, and any components placed in the drift for structural or chemical purposes). The analysis must accommodate many hypothetical future scenarios and a range of input parameter values. Hence the PA models must Abstract the major process features, to span the range of evaluations with computational efficiency and to allow for sensitivity evaluations of the total system. This Abstraction is guided by experiments and detailed calculational evaluations for specific situations. The present paper shows the setting of a glass-waste chemical alteration model within the larger-scope PA model, a typical Abstraction for a glass aqueous alteration model, and thus the types of topics we need to cover as exemplified by the model. The Abstraction includes the most important constituents of the water contacting the waste, and an effect on the rate from the increasing silica going into solution. The interfaces to other processes at the boundary of this process domain identify some important issues.
KeywordsHydration Radionuclide Cristobalite
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