Electrochemical corrosion potential models for boiling-water reactor applications

The electrochemical corrosion potential (ECP) of stainless steel (SS) was measured under simulated boiling-water reactor (BWR) coolant circuit conditions using a rotating cylinder electrode (RCE). Based upon those measurements, an empirical model was developed to predict ECP of structure materials in a BWR primary circuit as a function of hydrogen, oxygen, and hydrogen peroxide concentrations in the reactor coolant and of the water flow velocity. Results of ECP modeling using the H2, O2, and H2O2 concentrations calculated by the radiolysis model were compared to internal ECP data obtained in an operating reactor