Electrochemical approaches for the corrosive conditions in high temperature water containing H $_{2}$ O $_{2}$

Sato, Tomonori ; Kato, Chiaki ; Ogi, Hirokazu*; Yamamoto, Masahiro ; Ueno, Fumiyoshi

The hydrogen peroxide (H $_{2}$ O $_{2}$ ) generated by the water radiolysis in the reactor coolant under irradiated condition plays an important role for the stress corrosion cracking (SCC) in the boiling water reactors (BWRs). In this study, the corrosive condition in high temperature water containing H $_{2}$ O $_{2}$ was observed directly utilizing electrochemical impedance spectroscopy (EIS) in high temperature pure water. And the diffusion coefficient and thermal decomposition rate of H $_{2}$ O $_{2}$ at the 288 $^{circ}$ C were estimated based on the obtained impedance responses. The reciprocal of the polarization resistance has linear relationship to the H $_{2}$ O $_{2}$ concentration. The estimated diffusion coefficient of H $_{2}$ O $_{2}$ (D $_{rm H2O2}$ ) was 1.510 $^{-4}$ cm $^{2}$ /s when the thickness of the diffusion layer was assumed to be 0.05 cm. The thermal decomposition rate of H $_{2}$ O $_{2}$ in 288 $^{circ}$ C was 0.042 s $^{-1}$ .

Language	:	English
Journal	:	Proceedings of Symposium on Water Chemistry and Corrosion in Nuclear Power Plants in Asia 2013 (USB Flash Drive)
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Pages	:	6 Pages
Publication Year/Month	:	2013/10
Meeting title	:	Symposium on Water Chemistry and Corrosion in Nuclear Power Plants in Asia 2013
Held date	:	2013/10
Location (city)	:	Taichung
Location (country)	:	Taiwan
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Registration No. : BB20132005
JAEA Abstracts No. : 42000239
Paper Submission No. : 13812

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Electrochemical approaches for the corrosive conditions in high temperature water containing HO

Electrochemical approaches for the corrosive conditions in high temperature water containing H $_{2}$ O $_{2}$