IngentaConnect Electrochemical sensor array for in situ measurements of hydrogen...

Authors: Uchida, S.; Satoh, T.; Satoh, Y.; Wada, Y.

Source: Energy Materials: Materials Science and Engineering for Energy Systems, Volume 3, Number 2, June 2008 , pp. 104-112(9)

Publisher: Maney Publishing

Abstract:

A common index of corrosive conditions in boiling water reactors (BWRs) is the electrochemical corrosion potential (ECP), which is determined by a combination of factors such as specimen surface conditions and oxidant concentrations (e.g. O₂, H₂O₂ and other corrosive radiolytic species). ECP sensors can be applied to determine corrosive conditions directly at elevated temperature, but a disadvantages of this approach is the broad plateau observed in the range 10-100 ppb H₂O₂. To determine the concentration [H₂O₂] directly in high temperature water, an array consisting of an ECP sensor and a complex impedance sensor has been developed. From the results, it is concluded: (1) the radii of the low frequency semicircle of the frequency dependent complex impedance (FDCI) data (Cole-Cole plots) decreased with increasing [H₂O₂]. The radii for the specimen exposed to 100 ppb H₂O₂ were determined by the electric resistance of the oxide film, and had reached the saturation level caused by saturation of oxide film growth; (2) the performance of the sensor array has been validated by [H₂O₂] measurements in the high temperature, high pressure hydrogen peroxide water loop; (3) a combination of ECP and FDCI sensors is a candidate to determine [H₂O₂] in BWR primary coolant at elevated temperature.

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Electrochemical sensor array for in situ measurements of hydrogen peroxide concentration in high temperature water