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Microstructure, Partitioning and Dissolution Behaviour of Synroc Containing Acrinides

Published online by Cambridge University Press:  25 February 2011

M.G. Blackford,
K.L. Smith and
K.P. Hart
M.G. Blackford
Affiliation:
Advanced Materials Program, Australian Nuclear Science and Technology Organisation, P.M.B. 1, Menai, N.S.W., 2234, Australia
K.L. Smith
Affiliation:
Advanced Materials Program, Australian Nuclear Science and Technology Organisation, P.M.B. 1, Menai, N.S.W., 2234, Australia
K.P. Hart
Affiliation:
Advanced Materials Program, Australian Nuclear Science and Technology Organisation, P.M.B. 1, Menai, N.S.W., 2234, Australia
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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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References

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