[1M04-07] Water chemistry and Corrosion for LWR

11:25 AM - 11:40 AM JST(2:25 AM - 2:40 AM UTC)

[1M06] Effects of Oxygen Injection and Platinum Deposition on Flow Accelerated Corrosion of Carbon Steel under Simulated Reactor Water Clean-up System Conditions(3) FAC rates of carbon steel at 280 oC with Pt deposition

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

Keywords:

BWR,Carbon steel,Flow accelerated corrosion,Platinum,Clean up water system,ECP

Recently, reports of flow accelerated corrosion (FAC) of carbon steel (CS) piping in clean-up water system are increasing among US BWRs. Noble metal chemical application (NMCA) which injects Pt compound into reactor water to mitigate stress corrosion cracking is taken as a possible cause of it. Since studies on the effects of Pt on FAC of CS are limited, the effects of Pt deposited upon CS on the FAC were studied under excess hydrogen and coexisting oxygen condition at 280 ^oC. Platinum reduced FAC rates of CS in excess hydrogen and coexisting oxygen environment than that in only HWC. It was found that electrochemical corrosion potential determined by combination of Pt deposition and water chemistry controls FAC rates of CS.