[3E01-03] Corrosion and Electrochemistry in PWR

[3E03] The effects of hydrogen addition on the corrosive conditions of PWR primary coolant under irradiation

11. Effects of oxide and hydrogen peroxide on anodic polarization curves and ECP

*Shunsuke Uchida¹, Kuniki Hata¹, Satoshi Hanawa¹, Yasuhi Chimi¹, Tomo Sa¹ (1. JAEA)

Keywords:PWR, BWR, radiolysis, ECP analysis

In order to evaluate ECP, determination of anodic polarization curves as well as oxidant concentrations are the key issues. The anodic polarization curves could be determined as a function of material properties, temperature and pH. ECP used to be analyzed by applying observed anodic polarization curves both for O₂ and H₂O₂. For mixtures of both, a complex average curve based on the ratio of their cathoidic current densities was applied. A radiolysis and ECP combined code, WRAC-JAEA, applied only anodic polarization curve, which was added by the effects of oxidation current of H₂O₂. The procedures could determine FCP for the complex mixture based on theoretical anodic polarization curve of steel and H₂O₂ oxidation current density.