Abstract
Uranyl oxide hydrate phases are known to form during contact of oxide spent nuclear fuel with water under oxidizing conditions; however, less is known about the fate of fission and neutron capture products during this alteration. We describe, for the first time, evidence that neptunium can become incorporated into the uranyl secondary phase, dehydrated schoepite (UO3·0.8H2O). Based on the long-term durability of natural schoepite, the retention of neptunium in this alteration phase may be significant during spent fuel corrosion in an unsaturated geologic repository.
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Acknowledgement
This work was performed under guidance of the Yucca Mountain Site Characterization Project (YMP) and is part of activity D-20-43 in the YMP/ Lawrence Livermore National Laboratory Spent Fuel Scientific Investigation Plan. Work supported by the U.S. Department of Energy under contract W-31-109-ENG-38.
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Buck, E.C., Finch, R.J., Finn, P.A. et al. Retention of Neptunium in Uranyl Alteration Phases Formed During Spent Fuel Corrosion. MRS Online Proceedings Library 506, 87–94 (1997). https://doi.org/10.1557/PROC-506-87
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DOI: https://doi.org/10.1557/PROC-506-87