Diffusion of Cs and Sr in compacted bentonites under reducing conditions and in the presence of corrosion products of iron

K. Idemitsu, Y. Tachi, H. Furuya, Y. Inagaki, T. Arima

研究成果: Contribution to journalConference article査読

8 被引用数 (Scopus)

抄録

In high-level waste repositories, a carbon steel overpack will be corroded by consuming oxygen trapped in the repository after closure. Iron corrosion products are expected to interfere with migration of radionuclides by filling the pore in bentonite and sorbing radionuclides. In this study the apparent diffusion coefficients of cesium and strontium were measured in compacted Na-bentonites (Kunigel V1 and Kunipia F, JAPAN) contacted with carbon steel and its corrosion products under reducing conditions or without carbon steel under oxidizing conditions for comparison. The apparent diffusion coefficients of cesium with and without corrosion product were 2.2 to 13×10-12 m2/s. The apparent diffusion coefficients of strontium with and without corrosion product were 3.1 to 2.5×10-12 m2/s. There were significant effects of dry density (0.8 to 2.0 g/cm3) and montmorillonite contents (50% for Kunigel V1 or 100% for Kunipia F). The presence of corrosion product decreased the apparent diffusion coefficients of Cs in both bentonites and that of Sr in Kunigel V1, especially at low dry density. This may be due to corrosion product filling the pore in the bentonite, decreasing the free pore size and density for diffusion.

本文言語英語
ページ(範囲)[d]351-358
ジャーナルMaterials Research Society Symposium - Proceedings
506
DOI
出版ステータス出版済み - 1997
イベントProceedings of the 1997 Symposiumon Scientific Basis for Nuclear Waste Management XXI - Davos, Switz
継続期間: 9 28 199710 3 1997

All Science Journal Classification (ASJC) codes

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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