High-temperature leaching of an actinide-bearing, simulated high-level waste glass

Abstract

We would like to thank D. J. Bradley and R. P. Turcotte for contributing to the design of these experiments. R. C. Britton, N. D. Stice and H. Hollis provided assistance in running the tests. A. C. Leaf and F. T. Hara performed the chemical analyses on the large number of samples generated. G. B. Long and S. E. King provided editorial assistance.

Radiation Effects in Glasses Used for Immobilization of High-level Waste and Plutonium Disposition

“…Gamma-irradiation of several HLW glasses up to 10 9 Gy also leads to increases in dissolution rates of up to a factor of four. 44,177,178 It is now well established that the short-term tests based on weight loss in these studies can underestimate the radiation-induced increases in dissolution rate by a factor of three to four due to precipitation of alteration phases on the surface of the glass 29,179 ; consequently, based on the limited data and understanding available, it has been suggested by Weber 29,30 that radiation-induced changes in HLW glass structure are not expected to increase the leach rate by more than a factor of 10, provided there are no radiation-induced phase separations or transformations. This assessment is supported by a study 49 of a seventeen-year-old borosilicate glass containing 4 wt.…”

Facile incorporation of technetium into magnetite, magnesioferrite, and hematite by formation of ferrous nitratein situ: precursors to iron oxide nuclear waste forms

“…The normalized release rates of Tc from 1-3 may be compared to those of boron from high-level borosilicate waste glass (B and Tc have similar leach rates) and Ti from the durable titanate ceramic Synroc (Tc replaces Ti and their normalized release rates should be similar). [81][82][83][84][85] Borosilicate high-level waste glass has a LR for boron of 1×10 -3 g m -2 d -1 at 23 °C for 62 days. 86,87 In Synroc C, the measured LR for Ti is is 2×10 -5 g m -2 d -1 at 95 °C; 22 the calculated LR for Ti at 21 °C is 2×10 -6 g m -2 d -1 using the activation energy for leaching from Synroc, 30 kJ mol -1 .…”