Abstract
As part of the pyrometallurgical treatment of used Experimental Breeder Reactor-II fuel, a metal waste stream is generated consisting primarily of cladding hulls laden with fission products noble to the electrorefining process. Consolidation by melting at high temperature [1873 K (1600 °C)] has been developed to sequester the noble metal fission products (Zr, Mo, Tc, Ru, Rh, Te, and Pd) which remain in the iron-based cladding hulls. Zirconium from the uranium fuel alloy (U-10Zr) is also deposited on the hulls and forms Fe-Zr intermetallics which incorporate the noble metals as well as residual actinides during processing. Hence, Zr has been chosen as the primary indicator for consistency of the metal waste. Recently, the first production-scale metal waste ingot was generated and sampled to monitor Zr content for Fe-Zr intermetallic phase formation and validation of processing conditions. Chemical assay of the metal waste ingot revealed a homogeneous distribution of the noble metal fission products as well as the primary fuel constituents U and Zr. Microstructural characterization of the ingot confirmed the immobilization of the noble metals in the Fe-Zr intermetallic phase.
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Acknowledgments
The authors would like to acknowledge the Hot Fuel Examination Facility and Fuel Conditioning Facility operations personnel for their recent contributions and the Analytical Laboratory staff for chemical services. Given the extended history of metal waste form development, the following researchers at Argonne National Laboratory and the Idaho National Laboratory should also be recognized and this by no means represents a complete list: D.P. Abraham, J.P. Ackerman, R.W. Benedict, T.D. DiSanto, N.L. Dietz, W.L. Ebert, R.N. Elliott, T.H. Fanning, J.K. Fink, K.M. Goff, I. Johnson, S.G. Johnson, D.D. Keiser, Jr., C.J. Knight, J.R. Krsul, R.P. Lind, C.D. Morgan, E.E. Morris, S.M. McDeavitt, M. Noy, J.Y. Park, M.C. Petri, J.W. Richardson, Jr., D. Vaden, S. White, and R.A. Wigeland. This work was supported by the U.S. Department of Energy, Office of Nuclear Energy, Science, and Technology, under DOE-NE Idaho Operations Office Contract DE-AC07-05ID14517.
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Westphal, B.R., Frank, S.M., McCartin, W.M. et al. Characterization of Irradiated Metal Waste from the Pyrometallurgical Treatment of Used EBR-II Fuel. Metall Mater Trans A 46, 83–92 (2015). https://doi.org/10.1007/s11661-013-2114-z
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DOI: https://doi.org/10.1007/s11661-013-2114-z