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Plutonium Ceramic in Underground Storage

#1819


Study of Plutonium Ceramics Alteration under Conditions of Underground Disposal

Tech Area / Field

  • ENV-RWT/Radioactive Waste Treatment/Environment
  • MAT-CER/Ceramics/Materials

Status
8 Project completed

Registration date
21.03.2000

Completion date
17.05.2004

Senior Project Manager
Svetlova A V

Leading Institute
Khlopin Radium Institute, Russia, St Petersburg

Collaborators

  • Massachusetts Institute of Technology (MIT) / Nuclear Engineering Department, США, MA, Cambridge\nLaboratoire d'Electrochimie et de Chimie Analytique
  • associe au CNRS, UMR 7575
  • Separation Process &Radiochemistry, France, Paris\nForschungszentrum Karlsruhe Technik und Umwelt / Institut für Nukleare Entsorgungstechnik, Germany, Karlsruhe\nHarry Reid Center for Environmental Studies, USA, NV, Las-Vegas

Project summary

Main goal of the Project is the study of An-doped ceramics (where An = Pu, U, Np, Am, Cm) altered by water solutions simulating real geological environment.

Ceramic matrices of three different compositions will be studied: pyrochlore-based ceramic, Ca(An,...)Ti2O7, developed by Lawrence Livermore National Laboratory (USA); double-phase ceramic based on zircon, (Zr,An)SiO4, and zirconia, (Zr,An)O2, as well as mono-phase ceramic based on cubic zirconia, (Zr,Gd,An)O2, developed in Khlopin Radium Institute (Russia). Aggressive media will be simulated by ion-saturated solution which reflect underground water solutions for Nizhnekanskiy granitic massif, porphyritic rocks from Ural (Russia) and tuffs of Yucca Mountain (USA). Experiments using various artificial aggressive environments (acid and salts solutions) will be carried out too.

Geochemical durability of ceramic compositions significantly depends on the type of geological formations suggested for actinides disposal. Therefore, the main attention will be paid to examination of altered single mineral phases in ceramic matrices and sorption of different ions on their surfaces, to estimation of the actinide release rate from ceramics under various conditions. Obtained results will allow to choose correctly the ceramic matrices of definite types acceptable for disposal in different geological formations. The Project will be carried out by experienced specialists of V.G. Khlopin Radium Institute responsible for development of technology for final disposal of actinide wastes including weapons-grade plutonium.


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