High temperature gas-cooled nuclear reactors (HGTRs) utilize tri-structural isotropic (TRISO) coated particle fuels. The SiC layer acts as the main barrier to the diffusion of fission products, provides mechanical support, and maintains structural rigidity of the TRISO fuel. Previous studies have demonstrated that chemical interactions of nuclear fission products with the SiC layer of TRISO fuel limit cell performance. In particular, palladium may corrode and fracture the SiC, while silver diffuses through the layer and may contaminate the reactor, posing a safety hazard for workers. An understanding of the reaction mechanisms and kinetics of these interactions under normal operation as well as accident conditions is critical for the development of advanced nuclear reactors, but currently is not well understood.We have grown SiC thin films using pulsed laser deposition. By depositing 0.5 - 5ML of palladium or silver onto the thin films, we can characterize the chemical interactions between the metal fission products and the SiC layer using x-ray photoelectron spectroscopy (XPS) in order to determine how the structural integrity of TRISO fuels is reduced. Results will be compared to theoretical calculations conducted by the Stoller group at Oak Ridge National Laboratory.

Growth and characterization of palladium and silver coated silicon carbide thin films for nuclear fuels applications

248th National Meeting (2014)

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