ZIRCONIUM AND FISSION PRODUCT MANAGEMENT IN THE ALSEP PROCESS
Solvent extraction systems that combine neutral donor extractants and acidic extractants are being investigated to provide a single process solvent for separating Am and Cm from acidic high-level liquid waste, including their separation from the trivalent lanthanides. This approach of combining extractants is collectively referred to as the Actinide-Lanthanide SEParation (ALSEP) process. Managing Zr and other fission products is one of the critical factors in developing the ALSEP process. In this work, a strategy has been developed in which Zr(IV) is extracted into the process solvent, then it is stripped from the solvent after the actinides have been selectively stripped. Molybdenum is strongly extracted into ALSEP solvents. Scrubbing the solvent with a citrate buffer before the actinide stripping step effectively removes Mo. Distribution ratios for Ru and Fe are low for extraction from HNO3, so these components can easily be routed to the high-level waste raffinate.
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- Conference: Global 2013: International Nuclear Fuel Cycle Conference - Nuclear Energy at a Crossroads, September 29- October 3, 2013 Salt Lake City, Utah
- American Nuclear Society, La Grange Park, IL, United States(US).
- Research Org:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
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- Country of Publication:
- United States
- ALSEP; HEH[EHP]; actinide separation; lanthanide separation; zirconium