Characterization and leaching behavior of plutonium-bearing Synroc-C

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Materials Research Society
Synroc-C containing 10wt% simulated PW-4b-D HLW including 0.62 wt% 239Pu was subjected to MCC-1 type leach tests at 70°C in deionised water, silicate and carbonate leachates for 53 d and deionised water for 2472 d. The normalised total (i.e. unfiltered leachate + vessel wall) Pu leach rates in deionised water, silicate and carbonate leachates for periods up to 53 d were found to be of the order of 10-5, 10-4 and 10-4 g m-2 d-1 respectively. After 2472 d, the differential, normalised, Pu leach rate in deionised water dropped to ∼5 × 10-6 (total) and ∼5 × 10-8 (solution - after filtration through a 1000NMW filter) g m-2 d-1. SEM and AEM were used to characterise our starting material and investigate the secondary phases on the surfaces of leached Synroc-C discs. Calculated and measured normalised Pu leach rates are compared and the partitioning of Pu between zirconolite and perovskite is discussed. © Materials Research Society 1997
Physical copy held by ANSTO at DDC: 621.4838/31. Abstract also available online at
Synroc process, Leaching, Plutonium, Water, Silicates, Zirconolite, Nuclear weapons
Smith, K. L., Lumpkin, G. R., Blackford, M. G., Hambley, M., Arthur Day, R., Hart, K. P., & Jostsons, A. (1996). Characterization and leaching behavior of plutonium-bearing Synroc-C. Paper presented to the Scientific Basis for Nuclear Waste Management XX, Symposium held December 2-6, 1996, Boston, Massachachuetts, U. S. A. In Gray, W. J. & Triay, I. R. (Eds.), Material Research Society Symposium Proceedings, Symposium held 2-6 December, 1996, Boston, Massachusetts, U. S. A., (Vol. 465, pp. 1267-1272).