Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Dynamic Boric Acid Corrosion of Low Alloy Steel for Reactor Pressure Vessel of PWR using Mockup Test

가압형 경수로 압력용기 재료인 저합금강의 동적 붕산 부식 실증 연구

  • Kim, Sung-Woo (Nuclear Materials Development, Korea Atomic Energy Research Institute) ;
  • Kim, Hong-Pyo (Nuclear Materials Development, Korea Atomic Energy Research Institute) ;
  • Hwang, Seong-Sik (Nuclear Materials Development, Korea Atomic Energy Research Institute)
  • 김성우 (한국원자력연구원 원자력재료개발부) ;
  • 김홍표 (한국원자력연구원 원자력재료개발부) ;
  • 황성식 (한국원자력연구원 원자력재료개발부)
  • Received : 2012.12.17
  • Accepted : 2013.02.06
  • Published : 2013.04.15
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Abstract

This work is concerned with an evaluation of dynamic boric acid corrosion (BAC) of low alloy steel for reactor pressure vessel of a pressurized water reactor (PWR). Mockup test method was newly established to investigate dynamic BAC of the low alloy steel under various conditions simulating a primary water leakage incident. The average corrosion rate was measured from the weight loss of the low alloy steel specimen, and the maximum corrosion rate was obtained by the surface profilometry after the mockup test. The corrosion rates increased with the rise of the leakage rate of the primary water containing boric acid, and the presence of oxygen dissolved in the primary water also accelerated the corrosion. From the specimen surface analysis, it was found that typical flow-accelerated corrosion and jet-impingement occurred under two-phase fluid of water droplet and steam environment. The maximum corrosion rate was determined as 5.97 mm/year at the leakage rate of 20 cc/min of the primary water with a saturated content of oxygen within the range of experimental condition of this work.

Keywords

References

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