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C-14 Release Behavior and Chemical Species from Irradiated Hull Waste under Geological Disposal Conditions

Published online by Cambridge University Press:  01 July 2014

Yu Yamashita ,
Hiromi Tanabe ,
Tomofumi Sakuragi ,
Ryota Takahashi  and
Michitaka Sasoh
Yu Yamashita
Affiliation:
Toshiba Corporation, 4-1 Ukishima-cho, Kawasaki-ku, Kawasaki 210-0862, Japan
Hiromi Tanabe
Affiliation:
Radioactive Waste Management Funding and Research Center, Pacific Marks Tsukishima, 1-15-7 Tsukishima, Chuo-ku, Tokyo, 104-0052, Japan
Tomofumi Sakuragi
Affiliation:
Radioactive Waste Management Funding and Research Center, Pacific Marks Tsukishima, 1-15-7 Tsukishima, Chuo-ku, Tokyo, 104-0052, Japan
Ryota Takahashi
Affiliation:
Toshiba Corporation, 4-1 Ukishima-cho, Kawasaki-ku, Kawasaki 210-0862, Japan
Michitaka Sasoh
Affiliation:
Toshiba Corporation, 4-1 Ukishima-cho, Kawasaki-ku, Kawasaki 210-0862, Japan
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Abstract

C-14 contained in Hull waste is one of the most important radionuclides in the safety assessment of transuranic (TRU) waste disposal. For more realistic safety assessment, it is important to clarify the release mechanism and chemical species of C-14 from Hull waste. In this research, leaching tests were conducted using an irradiated Zry cladding tube from a boiling-water reactor (BWR) to obtain leaching data and to investigate the relationship between Zry metal corrosion and C-14 release behavior. Both organic and inorganic C-14 compounds existed in the the liquid phase, and some C-14 moved to the gaseous phase. The release rate of C-14 obtained from the BWR cladding tube after two-year leaching tests was lower than the release rate from a pressurize water reactor (PWR) cladding tube. It is considered that the BWR cladding tube used in this test did not easily corrode since it used a comparatively new material. The release rate of C-14 was slightly lower as compared with the corrosion rate of unirradiated Zry. This is thought to be the result of improved corrosion resistance conferred by neutron irradiation, which encouraged the dissolution of grain boundary precipitation elements, such as Fe, Cr, and Ni, into the crystal grains. The leaching tests will be continued for 10 years.

Keywords

Cgeologicwaste management
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1665: Symposium NW – Scientific Basis for Nuclear Waste Management XXXVII , 2014 , pp. 187 - 194
Copyright
Copyright © Materials Research Society 2014 

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References

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