[1M02-03] Operation, Inspection and Maintenance 1-2

[1M03] Effects of Oxygen Injection and Platinum Deposition on Flow Accelerated Corrosion of Carbon Steel under Simulated Reactor Water Clean-up System Conditions

(2) Effectiveness of Oxygen Injection on FAC Mitigation at 150 ^oC

*Hikari Murotani¹, Toshimasa Ohashi¹, Yoichi Wada¹, Ryosuke Shimizu², Makoto Nagase², Shinobu Okido² (1. Hitachi, 2. HGNE)

Keywords:BWR, Carbon Steel, Flow Accelerated Corrosion, Oxygen Injection, Platinum, Clean-up Water System, Water Chemistry

Most of BWR plants in the US have been operated with hydrogen injection (HWC) and Online NobleChem^TM (OLNC) as a countermeasure against stress corrosion cracking. Recently, reports of flow accelerated corrosion (FAC) of carbon steel (CS) piping in clean-up water system (CUW) are increasing. Since studies on the effects of noble metal on CS corrosion are limited, the effects of platinum deposition on CS caused by OLNC on the FAC of the CS and effectiveness of oxygen injection for the FAC mitigation were investigated under simulated CUW conditions. It was found that the FAC mitigation effect of oxygen injection on platinum-deposited CS was limited to the water quality condition with excess dissolved oxygen to dissolved hydrogen.