[1A08-12] Radiolysis, Corrosion 3

[1A09] Corrosion evaluation and mitigation in the PCV systems under the influence of α/β/γ radiolysis

(2) Effects of α-ray irradiations on the corrosion

*Tomonori Sato¹, Nobuaki Sato², Kuniki Hata¹, Chiaki Kato¹, Yutaka Watanabe² (1. Japan Atomic Energy Agency, 2. Tohoku University)

Keywords:Corrosion, Radiolysis, alpha-ray, Carbon steel, Stainless steel

Primary containment vessel in Fukushima Daiichi nuclear power station is exposed to the corrosive environment under irradiation. Especially, the materials nearby the fuel debris will be exposed not only to gamma-ray but also to alpha- and beta-rays. However, the limited data were reported for the corrosion evaluations under the direct irradiation of alpha- and beta-rays. So, the electrochemical investigations were performed using alpha-ray source in this study. As a result, it was confirmed that the polarization resistance of carbon steel decreased and the corrosion potential of stainless steel increased by alpha-ray irradiation.