Dissolution of Chemical Decontaminating Agent for a Foam Decontamination

Radioactive corrosion oxides in pressurized light water reactors consist of an inner layer formed of crystals of Fe, Ni and Cr ions formed through the oxidation of a metal element at the interface between the oxide film and metal, and an outer layer formed by being diffused to the boundary between the coolant and oxide film through the pores of the oxide film and precipitated. Prior to confirming the decontamination performance of a foam decontaminating agent, a study was conducted to optimize the composition of the chemical decontaminating agent available for foam decontaminating agent. At lower concentrations of 0.1 M Ce (IV), the amounts of Fe and Cr dissolved increased by 25% and 67%, respectively, as the HNO₃ concentration was doubled, whereas the amounts of Fe and Cr dissolved were increased at higher concentrations of Ce (IV) by 2.6- and 1.3-fold, respectively. Therefore, it seems to be possible to use it as a chemical decontamination agent necessary for optimizing foam decontamination composition which is effective in reducing liquid waste.