Effects of water redox conditions and presence of magnetite on leaching of Pu and Np from HLW glass

Y. Inagaki, H. Sakata, H. Furuya, K. Idemitsu, T. Arima, T. Banba, T. Maeda, S. Matsumoto, Y. Tamura, S. Kikkawa

Research output: Contribution to journalConference articlepeer-review

12 Citations (Scopus)

Abstract

The objective of this study is to evaluate the effects of water redox conditions and of the presence of iron corrosion products (magnetite) on the release of actinides from HLW glasses. Static corrosion tests were performed on a simulated HLW glass doped with Pu and Np in deionized water in the presence of magnetite under oxidizing and reducing conditions. The tests under oxidizing conditions were performed in air, while the tests under reducing conditions were performed in mixed gas (Ar+5%H2) atmosphere. The following results were obtained: (1) The presence of magnetite enhances formation of colloids containing Pu and Np in the leachates under both redox conditions. (2) Redox conditions have no remarkable influence on the release of Pu. (3) The reducing conditions combined with the presence of magnetite cause a decrease in the concentrations of Np dissolved species, which is probably the result of the reduction of Np(V) to Np(IV) at the magnetite surface.

Original languageEnglish
Pages (from-to)[d]177-184
JournalMaterials Research Society Symposium - Proceedings
Volume506
DOIs
Publication statusPublished - 1997
EventProceedings of the 1997 Symposiumon Scientific Basis for Nuclear Waste Management XXI - Davos, Switz
Duration: Sep 28 1997Oct 3 1997

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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