2021 Volume 70 Issue 12 Pages 441-447
Zeolite particles have been used in a Cs adsorption vessel for purification of contaminated water in Fukushima Dai-ich nuclear power station （1F）. The used Cs adsorption vessels were kept in storage space on the 1F site. The risk of localized corrosion of stainless steel used in the vessel was worrying. To evaluate the risk of localized corrosion, using specially designed electrochemical testing apparatus was used under gamma-ray irradiation test. And, real size mock-up test was conducted. The results showed that the presence of zeolite particles decomposed hydrogen peroxide generated by radiolysis and consequently suppressed the ennobled corrosion potential of stainless steel by γ-ray irradiation. Moreover, the concentration of chloride ions in the remaining water was not increased by the decay heat of radioactive Cs adsorbed on the zeolite. These data indicate the minimizing risk of localized corrosion of the Cs adsorption vessel.
