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Report No.
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A New concept sensor for determination of oxygen and hydrogen peroxide concentrations in nuclear reactor coolant

Sato, Tomonori ; Miwa, Yukio; Tsukada, Takashi ; Uchida, Shunsuke

At the surface of a pure metal, a particular half cell reaction corresponding to an exposed water chemistry condition occurs. In principle, O$$_{2}$$ and H$$_{2}$$O$$_{2}$$ concentrations under irradiation condition can be determined by the comparison of the redox potential responses of some kind of pure metals corresponding to exposed condition. We are developing a new array-type sensor based on this concept to determine O$$_{2}$$ and H$$_{2}$$O$$_{2}$$ concentrations in aqueous environment under irradiation. In order to confirm the concept of sensor, responses of the redox potentials of pure metals to the changes in O$$_{2}$$ and H$$_{2}$$O$$_{2}$$ concentrations were measured under non-irradiated condition. (1) The different responses of redox potentials to O$$_{2}$$ and H$$_{2}$$O$$_{2}$$ concentrations were obtained for the pure Fe, Cr, Zr and Pt electrodes. (2) The possibility of the concept of new array-type sensor to determine the O$$_{2}$$ and H$$_{2}$$O$$_{2}$$ concentrations was confirmed.

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