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A Simulation of radiolysis of chloride solutions containing ferrous ion

Hata, Kuniki; Inoue, Hiroyuki*

To investigate the effect of dissolved species from steels on the radiolysis processes of Cl$$^{-}$$, radiolysis simulations of solutions containing both Cl$$^{-}$$ and Fe$$^{2+}$$ were carried out. The results showed that the generation of radiolytic products (H$$_{2}$$O$$_{2}$$, O$$_{2}$$ and H$$_{2}$$) increased mainly by the addition of Fe$$^{2+}$$, and a drop in the pH was caused by the hydrolysis of Fe$$^{3+}$$. This pH drop enhanced the reactivity of Cl$$^{-}$$ with $$^{.}$$OH, which induced additional generation of H$$_{2}$$O$$_{2}$$ and O$$_{2}$$. These results show that low concentrations of Cl$$^{-}$$ (1 $$times$$ 10$$^{-3}$$ mol/dm$$^{3}$$ = 35ppm) in the presence of Fe$$^{2+}$$ could influence the generation of H$$_{2}$$O$$_{2}$$ and O$$_{2}$$ during water radiolysis. However, it is considered that these effects of Fe$$^{2+}$$ and low concentration of Cl$$^{-}$$ on water radiolysis are less important for corrosion of steels due to the low concentrations of H$$_{2}$$O$$_{2}$$ and O$$_{2}$$ generated. The other process, such as dissolution of iron enhanced by FeOOH, might predominantly induce corrosion under the conditions of solutions with low concentrations of H$$_{2}$$O$$_{2}$$ and O$$_{2}$$.

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Category:Nuclear Science & Technology

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