Home / Publications / Journals / Nuclear Technology / Volume 61 / Number 3
Nuclear Technology / Volume 61 / Number 3 / June 1983 / Pages 475-486
Technical Paper / New Directions in Nuclear Energy with Emphasis on Fuel Cycles / Nuclear Fuel / dx.doi.org/10.13182/NT61-475
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Fractional releases of silver and cesium from irradiated silicon-carbide-layered coated particles have been measured during isothermal anneals in the temperature range between 1273 and 1773 K. The release rates measured have been evaluated with the aid of a statistical numerical treatment based on a simple diffusion model in multizone geometry. The resulting diffusion coefficients can be described byfor silver and
for cesium, respectively. A statistical treatment of the data gives corresponding 95% confidence limits. It is argued that the pathway of cesium and silver transport in siliconcarbide layers is grain boundary diffusion. This explains the large scatter found in the data for coating layers because the defect structure depends on the individual manufacturing conditions and varies from coating to coating. Comparison with data from the literature shows the superiority of silicon carbide with respect to silver retention relative to diffusion rates in pyrocarbons, while cesium data indicate no distinct improvement.