Speaker
Dr
Tomofumi Sakuragi
(Radioactive Waste Management Funding and Research Center)
Description
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)
Co-authors
Mr
Osamu Kato
(Kobe Steel, Ltd.)
Mr
Satoshi Yoshida
(Kobe Steel, Ltd.)
Mr
Tsuyoshi Tateishi
(Kobelco Research Institute, Inc.)
