The effect of actinides on the microstructural development in a metallic high-level nuclear waste form Page: 4 of 15
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THE EFFECT OF ACTINIDES ON THE MICROSTRUCTURAL
DEVELOPMENT IN A METALLIC HIGH-LEVEL NUCLEAR WASTE FORM
Dennis D. Keiser, Jr.a, Wharton Sinklera, Daniel P. Abrahamb, James W. Richardson, Jr.", and
Sean M. McDeavitte
"Argonne National Laboratory-West, P. O. Box 2528, Idaho Falls, ID 83403-2528
bArgonne National Laboratory, 9700 S. Cass Ave., Argonne, IL 60439-4803
Abstract
Waste forms to contain material residual from an electrometallurgical treatment of spent nuclear
fuel have been developed by Argonne National Laboratory. One of these waste forms contains
waste stainless steel (SS), fission products that are noble to the process (e.g., Tc, Ru, Pd, Rh),
Zr, and actinides. The baseline composition of this metallic waste form is SS-15wt.% Zr. The
metallurgy of this baseline alloy has been well characterized. On the other hand, the effects of
actinides on the alloy microstructure are not well understood. As a result, SS-Zr alloys with
added U, Pu, and/or Np have been cast and then characterized, using scanning electron
microscopy, transmission electron microscopy, and neutron diffraction, to investigate the
microstructural development in SS-Zr alloys that contain actinides. Actinides were found to
congregate non-uniformally in a Zr(Fe,Cr,Ni)+. phase. Apparently, the actinides were
contained in varying amounts in the different polytypes (C14, C15, and C36) of the
Zr(Fe,Cr,Ni)+X phase. Heat treatment of an actinide-containing SS-15 wt.% Zr alloy showed
the observed microstructure to be stable.
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Keiser, D. D. Jr.; Sinkler, W.; Abraham, D. P.; Richardson, J. W., Jr. & McDeavitt, S. M. The effect of actinides on the microstructural development in a metallic high-level nuclear waste form, article, October 25, 1999; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc702906/m1/4/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.