Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Analysis on Formation of Corrosion Products in Secondary Steam-Water System of Nuclear Power Plant

원자력발전소 2차측 습증기계통 주요지점별 부식 발생현황 분석

  • Lee, Kyunghee (Department of Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Han, Hoseok (Central Research Institute, Korea Hydro & Nuclear Power Co., Ltd.) ;
  • Shin, Sungyong (Central Research Institute, Korea Hydro & Nuclear Power Co., Ltd.) ;
  • Sung, Kibang (Central Research Institute, Korea Hydro & Nuclear Power Co., Ltd.) ;
  • Rhee, Youngwoo (Department of Chemical Engineering and Applied Chemistry, Chungnam National University)
  • 이경희 (충남대학교 응용화학공학과) ;
  • 한호석 (한국수력원자력 중앙연구원) ;
  • 신성용 (한국수력원자력 중앙연구원) ;
  • 성기방 (한국수력원자력 중앙연구원) ;
  • 이영우 (충남대학교 응용화학공학과)
  • Received : 2019.07.08
  • Accepted : 2019.07.29
  • Published : 2019.08.30
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Abstract

Pipes and components of the secondary system in the pressurized water reactor (PWR) are mainly comprised of manufactured carbon steel. Thus, the generated carbon steel corrosion products are transported into the steam generator and deposited, thereby deteriorating the integrity of the steam generator. Environmental condition in the secondary system of the PWRs differs across different locations. So, the corrosion rate and types of corrosion products depend on specific locations in the secondary system. In this study, the quantity and chemical compositions of corrosion products generated in various locations that vary in different temperatures and chemistry conditions were investigated. As a result of evaluating the PWR "Unit A" that is in current operation, the amount of corrosion products generated in the section of high temperature feedwater system was identified as the largest source in the secondary system. Major components of corrosion products were iron oxides such as magnetite, hematite, and lepidocrocite.

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References

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