[3E06-08] Radiolysis 1

[3E07] The effects of hydrogen addition on the corrosive conditions of PWR primary coolant under irradiation

(4)Direct and indirect effects of pH on ECP of stainless steel in the primary cooling water

*Shunsuke Uchida¹, Kuniki Hata¹, Satoshi hanawa¹, Yasuhiro Chimi¹ (1. JAEA)

Keywords:PWR, radiolysis analysis, radiolysis of water, electrochemical potential, INCA loop

The direct effects of hydrogen concentrations on the ECP were discussed in the previous presentation (the series #2). The parameters to determine ECP, e.g., pH and dose rate as well as hydrogen concentration, were different between in PWRs and BWRs. In the presentation, the direct and indirect effects of pH on ECP due to water radiolysis, surface properties and metallic ion solubilities are discussed, and then, from the viewpoint of the pH effects on ECP, optimal pH is proposed.