Diffusion of technetium in compacted bentonites in the reducing condition with corrosion products of iron
Conference
·
OSTI ID:572208
- Kyushu Univ., Fukuoka (Japan). Dept. of Nuclear Engineering
In the vicinity of a high-level waste repository, corrosion of carbon steel overpacks will create a reducing environment. Reducing conditions are expected to retard the migration of redox-sensitive radionuclides such as technetium. The apparent diffusion coefficients of technetium were measured in compacted bentonites (Kunigel V1{reg_sign} and Kunipia F{reg_sign}, Japan) in contact with carbon steel and its corrosion products under reducing conditions or without carbon steel under oxidizing conditions for comparison. The apparent diffusion coefficients measured were 10{sup {minus}10} to 10{sup {minus}11} m{sup 2}/s under oxidizing conditions and 10{sup {minus}12} to 10{sup {minus}13} m{sup 2}/s under reducing conditions. There were significant effects of redox condition, dry density (0.2 to 2.3 g/cm{sup 3}) and montmorillonite content (50% for Kunigel V1 or 100% for Kunipia F) on the apparent diffusion coefficients. Montmorillonite density could be a good index to explain density dependence of the diffusion coefficients under both reducing and oxidizing conditions.
- OSTI ID:
- 572208
- Report Number(s):
- CONF-961202--
- Country of Publication:
- United States
- Language:
- English
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