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Report No.

Effect of chloride and bromide ion on the concentration of hydrogen peroxide produced from seawater radiolysis

Hata, Kuniki ; Hanawa, Satoshi ; Motooka, Takafumi; Tsukada, Takashi 

Fukushima Daiichi Nuclear Power Plants experienced seawater injection into the cores and spent fuel pools as an emergent measure for a short period after the accident. The injected seawater was exposed to radiation, and radiolytic species were produced. Especially, hydrogen peroxide (H$$_{2}$$O$$_{2}$$) is known as an oxidant which affects corrosion of materials. In order to identify the important factor which results in the high concentration of H$$_{2}$$O$$_{2}$$ in seawater radiolysis, the concentrations of H$$_{2}$$O$$_{2}$$ in $$gamma$$-irradiated artificial seawater was measured and compared with the result of radiolysis calculation. Solutions containing some constituents of seawater were also measured to identify which ion affects H$$_{2}$$O$$_{2}$$ production of seawater radiolysis. The experimental results showed that the H$$_{2}$$O$$_{2}$$ production from seawater radiolysis is mainly attributed to reactions of Cl$$^{-}$$ and Br$$^{-}$$ in water radiolysis, though many kinds of ions are dissolved in seawater.



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