Korean Institute of Surface Engineering

pISSN : 1225-8024 | eISSN : 3399-8403

공학

한국표면공학회지 (51권4호 218-223)

Corrosion Damage Behavior of STS 304 and STS 415 for Reactor Coolant Pump during Ultrasonic-Chemical Decontamination Process

원자로 냉각재 펌프용 STS 304와 STS 415의 초음파-화학제염 공정 시 부식 손상 거동

현광룡;박재철;한민수;김성종;
Hyeon, Gwang-Ryong;Park, Jae-Cheol;Han, Min-Su;Kim, Seong-Jong;

목포해양대학교 해군사관학부;(사)한국 선급;목포해양대학교 기관시스템공학부;
Division of Naval Officer Science, Mokpo National Maritime University;Machinery Technology Research Team, Korean Register;Division of Marine Engineering, Mokpo National Maritime University;

DOI : 10.5695/JKISE.2018.51.4.218

Abstract

In this study, we proposed a new ultrasonic-chemical decontamination process for decontaminating radioactive corrosion products during the maintenance of reactor coolant pump (RCP). The actual decontamination process was reproduced in the laboratory. And the corrosion characteristics of stainless steel (STS), constituting the RCP interior parts, were examined. The weight-loss measurment and polarization experiment were carried out in order to determine the corrosion characteristics of STS 304 and STS 415 by repeated decontamination processes. The STS 304 presented a little corrosion damage, which was almost indistinguishable from visual observation. The weight-loss rate of STS 304 was also significantly lower. On the other hand, STS 415 showed severe corrosion damage on its surface, greater weight-loss rate and higher corrosion current density than STS 304.

Keywords

Reactor coolant pump;Chemical decontamination;Stainless steel;Corrosion damage;