[2I01-04] Mitigation of corrosive environment/Dose rate reduction

[2I01] ECPs behavior of various plant constituent materials in high purity water at middle and low temperature

*Masahiko Tachibana¹, Kazushige Ishida¹, Yoichi Wada¹, Ryosuke Shimizu², Nobuyuki Ota² (1. Research & Development Group, 2. Hitachi-GE Nuclear Energy, Ltd.)

Keywords:Boiling water reactor, Electrochemical corrosion potential, Dissolved oxygen, Hydrogen peroxide, Stainless sttel, Ni-base alloy, Zirconium alloy, Carbon steel

Electrochemical corrosion potentials (ECPs) behavior of various plant constituent materials (Stainless steels, Ni-based alloys, Zirconium alloy, Carbon steel) were measured in high purity water at middle and low temperature. Those were obtained in both the H₂O₂ condition or the O₂ condition in order to improve ECPs knowledge at the temperature range of from 30 to 180℃. It was found that the ECPs in both O₂ condition and H₂O₂ condition remained at high value even at deaerated condition compared with the ECPs measured at rated temperature of BWR.