29 October 2017 to 3 November 2017
Australia/Sydney timezone

Activation energy for parabolic corrosion kinetics of Zircaloy-4 by consecutive hydrogen measurement at 30 – 80℃

30 Oct 2017, 17:45
Oral Presentation National and international collaborative waste management programs Spent Fuel & Zircaloy Cladding


Dr Tomofumi Sakuragi (Radioactive Waste Management Funding and Research Center)


On the issue related on a safe disposal of spent fuel claddings is the corrosion and the subsequent gas and radionuclides release. The Zircaloy corrosion under a prospected disposal condition has recently been investigated by sensitive hydrogen measurements at 30℃, and reported that the kinetics in the rate around nm/y follows the parabolic rate law. In the present work, an improved equipment to be usable even at higher temperatures up to 80℃ has been applied for measuring hydrogen gas generated from Zricaloy-4 corrosion for 90 days. The Arrhenius relation of the parabolic rate constants for the corrosion kinetics has showed the activation energy of 84.4 ± 8.4 kJ/mol, the value of which is lower than that for the general pre-transition corrosion under the in-pile temperature above 260℃ (i.e. 113-135 kJ/mol), suggesting that simple mass transfer through a thin and firm oxide film is limiting the low temperature corrosion of Zircaloy.

Primary author

Dr Tomofumi Sakuragi (Radioactive Waste Management Funding and Research Center)


Mr Osamu Kato (Kobe Steel, Ltd.) Mr Satoshi Yoshida (Kobe Steel, Ltd.) Mr Tsuyoshi Tateishi (Kobelco Research Institute, Inc.)

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