Leaching Characteristics of Actinides from Simulated Reactor Waste, Part 2
Leach rates for 237Np and 239Pu were investigated with a single-pass leaching system. The factorial experimental design uses several combinations of solution composition and flow rate and two temperatures, 25°C and 75°C. The 25°C results are compared with those from a modified IAEA procedure. At 25°C, leach rates decrease with time. Agreement between results from the single-pass and modified IAEA methods is fair with WIPP brine leachant, good with NaHCO3 and good with distilled H2O. Leach rates are approximately independent of flow rates at room temperature but increase with flow rates at high temperature. Rates for 237Np increase with temperature, but those for 239Pu either decrease or do not change with temperature.
KeywordsFactorial Experimental Design Waste Form Leach Rate Slow Flow Rate Vitreous Material
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