J.T. Dunwoody
Los Alamos National Laboratory
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Featured researches published by J.T. Dunwoody.
MRS Proceedings | 2009
Franz J. Freibert; Tarik A Salich; Daniel S. Schwartz; F Hampel; Jeremy N. Mitchell; Charles C Davis; A Neuman; Steve Willson; J.T. Dunwoody
Pre-irradiated thermodynamic and microstructural properties of nuclear fuels form the necessary set of data against which to gauge fuel performance and irradiation damage evolution. This paper summarizes recent efforts in mixed-oxide and minor actinide-bearing mixed-oxide ceramic fuels fabrication and characterization at Los Alamos National Laboratory. Ceramic fuels (U{sub 1-x-y-z}u{sub x}Am{sub y}Np{sub z})O{sub 2} fabricated in the compositional ranges of 0.19 {le} x {le} 0.3 Pu, 0 {le} y {le} 0.05 Am, and O {le} z {le} O.03 Np exhibited a uniform crystalline face-centered cubic phase with an average grain size of 14{micro}m; however, electron microprobe analysis revealed segregation of NpO{sub 2} in minor actinide-bearing fuels. Immersion density and porosity analysis demonstrated an average density of 92.4% theoretical for mixed-oxide fuels and an average density of 89.5 % theoretical density for minor actinide-bearing mixed-oxide fuels. Examined fuels exhibited mean thermal expansion value of 12.56 x 10{sup -6} C{sup -1} for temperature range (100 C < T < 1500 C) and ambient temperature Youngs modulus and Poissons ratio of 169 GPa and of 0.327, respectively. Internal dissipation as determined from mechanical resonances of these ceramic fuels has shown promise as a tool to gauge microstructural integrity and to interrogate fundamental properties.
Journal of Nuclear Materials | 2015
J.T. White; Andrew T. Nelson; Darrin D. Byler; D.J. Safarik; J.T. Dunwoody; Kenneth J. McClellan
Journal of Nuclear Materials | 2015
J.T. White; Andrew T. Nelson; J.T. Dunwoody; Darrin D. Byler; D.J. Safarik; Kenneth J. McClellan
Journal of Nuclear Materials | 2007
Kirk Wheeler; Pedro Peralta; Manuel Parra; Kenneth J. McClellan; J.T. Dunwoody; G. Egeland
Journal of Nuclear Materials | 2016
J.T. White; Andrew T. Nelson; J.T. Dunwoody; Darrin D. Byler; Kenneth J. McClellan
Journal of the American Ceramic Society | 2014
Andrew T. Nelson; Dylan R. Rittman; J.T. White; J.T. Dunwoody; Masato Kato; Kenneth J. McClellan
Journal of Nuclear Materials | 2017
J.T. White; Andrew T. Nelson; J.T. Dunwoody; D.J. Safarik; Kenneth J. McClellan
Journal of Nuclear Materials | 2017
J.T. White; Austin William Travis; J.T. Dunwoody; Andrew T. Nelson
Journal of Nuclear Materials | 2016
J.T. White; Andrew T. Nelson; J.T. Dunwoody; D.J. Safarik; Kenneth J. McClellan
Journal of Nuclear Materials | 2017
J.T. White; Andrew T. Nelson; J.T. Dunwoody; D.J. Safarik; Kenneth J. McClellan