Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 395, Issue 1-3, Pages 69-74Publisher
ELSEVIER
DOI: 10.1016/j.jnucmat.2009.09.019
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Zirconolite-based titanate ceramics containing U plus Th or Pu have been prepared. The final consolidation to produce a dense monolithic waste form was carried out using hot isostatic pressing (HIPing) of the calcined materials within a stainless steel can. The ceramics were characterised and tested for their overall feasibility to immobilise impure Pu or separated actinide-rich radioactive wastes. As designed, tetravalent U and Pu are mainly incorporated in a durable zirconolite phase, together with Gd or Hf added as neutron absorbers. The interaction of the waste form with the HIP can was also examined. No changes in the U valences or the U/Pu-bearing phase distributions were observed at the waste form-HIP can interface. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.
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