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High temperature gas reactors (HTGRs) are being considered for near
term deployment. A common factor among current HTGR designs is the
use of TRISO coated particle fuel. While there have been a number
of reactors operated with coated particle fuel, little work has
been done on the qualification of spent TRISO fuel for disposal. An
integral part of developing a spent fuel qualification plan is
modeling the in-repository behavior of the fuel. A basic model was
developed to simulate the time to failure of spent TRISO fuel in a
repository environment. Preliminary verification of the model was
performed with comparison to output from a proprietary model called
GARGOYLE that was also used to model degradation rates of TRISO
fuel. A sensitivity study was performed to determine which fuel and
repository parameters had the most significant effect on the
predicted time to fuel particle failure. Results of the analysis
indicate corrosion rates and thicknesses of the outer pyrolytic
carbon and silicon carbide layers, along with the time dependent
temperature of the spent fuel in the repository environment, have a
significant effect on the time to particle failure.
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