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Microstructure, Partitioning and Dissolution Behaviour of Synroc Containing Acrinides

  • M.G. Blackford (a1), K.L. Smith (a1) and K.P. Hart (a1)

Abstract

Synroc formulations containing 10 wt% simulated PW-4b type HLW in combination with a single transuranic dopant (Np, Pu, Am or Cm) were fabricated and characterised using alpha-track methods, SEM, AEM and dissolution testing. The Pu, Am and Cm-doped samples were calcined in 3.5%H2/96.5%N2. One of the Np-doped Synrocs was calcined in an atmosphere of pure H2, whilst another Np-doped Synroc was calcined in a mixture of 3.5%H2/96.5%N2. All the different formulations displayed microstructures similar to those of Synroc containing actinide-free simulated HLW. AEM derived phase compositions and phase distributions are given. All the Synrocs showed good durability when exposed to leachants (including doubly deionised water, and pH- and Eh-buffered solutions with pHs between 2 to 10). There were no obvious differences between the two Np-doped samples. The improved appearance and behaviour of allthe Synrocs in this study compared with similar formulations described by other authors is attributed to improved mixing techniques during fabrication.

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1. Matzke, H.J., Ray, I.L., Seatonberry, B.W., Theile, H., Trisoglio, C., Walker, C.T. and White, T.J., (1990) Incorporation of Transuranic Elements in Titanate Nuclear Waste Ceramics, J. Am. Ceram Soc., 73, 370–78.
2. Hart, K.P., Glassley, W.E. and McGlinn, P.J. (1991) Comparison of the Measured and Calculated Distribution of Actinide Elements Leached from Synroc in pH-buffered Solutions, Proc. Migration'91, The Third International Conf. on Chemistry and Migration Behavior of Actinides and Fission Products in the Geosphere, Jerez de la Frontera, Spain, 21-25 October,1991.1995.
3. Levins, D.M., Hart, K.P., McGlinn, P.J., Lam, P., Seatonberry, B.W., Robinson, B.J., Smith, K.L. and Leung, S. (1991) NERDDP Project No. 1122. Fabrication and Study of Synroc Containing Radioactive Waste Elements.
4. Jostsons, A., Smith, K.L., Blackford, M.G., Hart, K.P., Lumpkin, G.R., McGlinn, P., Myhra, S., Netting, A., Pham, D.K., Smart, R.St.C. and Turner, P.S. (1990) National Energy Research Development and Demonstration Program (NERDDP) Project No. 1319 Description of Synroc Durability: Kinetics and Mechanisms and Reaction.
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6. Lumpkin, G.R., Smith, K.L. and Blackford M.G. Electron microscope study of Synroc before and after exposure to aqueous solutions. Submitted to the J. Mater. Res.

Microstructure, Partitioning and Dissolution Behaviour of Synroc Containing Acrinides

  • M.G. Blackford (a1), K.L. Smith (a1) and K.P. Hart (a1)

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