Abstract
Oxidation behavior of the stainless steel fuel cladding is one of the important information to clarify the oxygen balance in the fast breeder reactor fuel pin during irradiation. In our previous work(1), oxidation behavior of SUS-316 stainless steel was investigated under oxygen potentials controlled by Mo/MoO2 and NbO2/Nb2O5 oxygen buffers, and the following information was obtained : The reaction product due to oxidationwas a mixture of Cr2O3 and MnCr2O4, and the oxidation rate was controlled by the outward diffusion of Cr in stainless steel ; this diffusion process was ascribed to the grain boundary diffusion because the activation energy, calculated from the temperature dependence of the parabolic rate constant, was close to that of the grain boundary diffusion of Cr in stainless steel rather than that of the lattice diffusion(2).
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