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Identification of the Cathode Reaction Accompanied with Overpack Corrosion

Published online by Cambridge University Press:  28 March 2012

Ichiro Otsuka
Affiliation:
Japan Atomic Energy Agency, Tokai, Ibaraki, 319-1195, Japan (Present Organization: Japan Nuclear Energy Safety Organization, Minato-ku, Tokyo, 105-0001, Japan.)
Yoshihisa Iida
Affiliation:
Japan Atomic Energy Agency, Tokai, Ibaraki, 319-1195, Japan.
Tetsuji Yamaguchi
Affiliation:
Japan Atomic Energy Agency, Tokai, Ibaraki, 319-1195, Japan.
Osamu Kato
Affiliation:
Kobe Steel, Ltd., Nada-ku, Kobe, 657-0845 Japan.
Tsuyoshi Tateishi
Affiliation:
Kobelco Research Institute, Inc., Nishi-ku, Kobe, 651-2271, Japan.
Tadao Tanaka
Affiliation:
Japan Atomic Energy Agency, Tokai, Ibaraki, 319-1195, Japan.
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Abstract

Cathode reaction on overpack corrosion in the geological repository environments of radioactive waste was identified from corrosion experiments of carbon steel specimens. Carbon steel specimens were encapsulated in degassed glass ampoules with various solutions which were prepared by distilled water degassed by Ar gas bubbling, and set in a thermostatic bath for several weeks. In the X-ray diffraction and X-ray photochemical spectroscopy, crystalline Fe3O4 and Fe2(OH)2CO3, and amorphous Fe(OH)2 were mainly detected on specimens which were immersed into distilled water, high concentration of sodium hydrogen carbonate solution, and low concentration of sodium hydrogen carbonate solution and sodium sulfate solution, respectively. Only hydrogen gas was detected in a gas phase analysis, indicating that hydrogen generation reaction was the dominant cathode reaction in the anoxic condition expected in geological repository environments.

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Articles
Copyright
Copyright © Materials Research Society 2012

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References

1. Japan Nuclear Cycle Development Institute, JNC TN 1400 99-020 (1999).Google Scholar
2. Iida, Y., Yamaguchi, T., Tanaka, T. and Nakayama, S., J. Nucl. Sci. Technol. 47, 431 (2010).10.1080/18811248.2010.9711633CrossRefGoogle Scholar
3. Otsuka, I., Taki, H., Yamaguchi, T., Iida, Y., Yamada, F., Inada, D. and Tanaka, T., JAEA-Research, 2008-043 , Japan Atomic Energy Agency (2008).Google Scholar

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