The corrosion/dissolution of simulated spent fuel has been studied electrochemically. Fission products within the UO_2 matrix are found to have significant effect on the anodic dissolution behaviour of the fuel. It is observed that H_2O_2 oxidation is accelerated on the surfaces of doped noble metal (ε) particles existing in the fuel matrix. It is concluded that H_2O_2 decomposition rather than UO_2 corrosion should be the dominant reaction under high H_2O_2 concentrations.
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