Retraction: Estimation of Corrosion Rate of Zr-2.5 wt%Nb Alloy (Fugen Pressure Tube) under Low-Temperature, Low-Oxygen, and High-pH Conditions

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  • 撤回：低温，低酸素および高pH条件下におけるZr-2.5 wt％Nb合金(ふげん圧力管)の腐食速度の算出
  • 低温,低酸素および高pH条件下におけるZr-2.5wt%Nb合金(ふげん圧力管)の腐食速度の算出
  • テイオン,テイサンソ オヨビ コウpH ジョウケン カ ニ オケル Zr-2.5wt%Nb ゴウキン(フゲンアツリョクカン)ノ フショク ソクド ノ サンシュツ

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Abstract

Corrosion rate data for activated metal wastes are necessary for the prediction of the radiological impact of radioactive waste disposal. However, there are no such data available in the consideration of Zr-2.5 wt%Nb alloy, which is used in pressure tubes of the Fugen Nuclear Power Plant. Since the pressure tubes are destined for sub-surface disposal, it is necessary to obtain the corrosion rate of Zr-2.5 wt%Nb alloy under the disposal conditions. In this study, corrosion tests were conducted in high alkalinity and deoxidized water at 30℃ by a gas-accumulating-type corrosion test. The corrosion rate decreased to 3.3-3.9 nm/y and the corrosion thickness increased in proportion to the cubic root of corrosion time until 24 months after the commencement of the test. The results indicate that the corrosion rate would decrease in proportion to the minus cubic root of corrosion time squared if the empirical corrosion characteristic that had been obtained in material research for light-water reactors is applicable.

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