Challenge toward extensive corrosion prevention in PCV system under the influence of // radiation, 3; Effects of - and -ray radiation on corrosion; Electrochemical investigations using sealed beta source

Sato, Tomonori  ; Kato, Chiaki   ; Sato, Nobuaki*; Hata, Kuniki ; Watanabe, Yutaka*

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 sealed beta-ray source (Sr-90) 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 beta-ray irradiation.