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Carbothermic Synthesis of ~820- m UN Kernels. Investigation of Process Variables [electronic resource].

Published
Washington, D.C. : United States. Office of the Assistant Secretary for Nuclear Energy, 2015.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
44 pages : digital, PDF file
Additional Creators
Oak Ridge National Laboratory, United States. Office of the Assistant Secretary for Nuclear Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
This report details the continued investigation of process variables involved in converting sol-gel-derived, urainia-carbon microspheres to ~820-μm-dia. UN fuel kernels in flow-through, vertical refractory-metal crucibles at temperatures up to 2123 K. Experiments included calcining of air-dried UO3-H2O-C microspheres in Ar and H2-containing gases, conversion of the resulting UO2-C kernels to dense UO2:2UC in the same gases and vacuum, and its conversion in N2 to in UC1-xNx. The thermodynamics of the relevant reactions were applied extensively to interpret and control the process variables. Producing the precursor UO2:2UC kernel of ~96% theoretical density was required, but its subsequent conversion to UC1-xNx at 2123 K was not accompanied by sintering and resulted in ~83-86% of theoretical density. Decreasing the UC1-xNx kernel carbide component via HCN evolution was shown to be quantitatively consistent with present and past experiments and the only useful application of H2 in the entire process.
Report Numbers
E 1.99:ornl/tm--2015/301
ornl/tm--2015/301
Subject(s)
Note
Published through SciTech Connect.
06/01/2015.
"ornl/tm--2015/301"
"AF5810000"
"NEAF278"
Terrence Lindemer; Chinthaka M Silva; John James Henry, Jr; Jake W McMurray; Brian C Jolly; Rodney Dale Hunt; Kurt A Terrani.
Funding Information
AC05-00OR22725
View MARC record | catkey: 24045719