About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Metallic Nuclear Fuel Design, Fabrication and Characterization
|
| Presentation Title |
High Temperature Structures, Oxidation, and Thermodynamics of Uranium Fuels |
| Author(s) |
Xiaofeng Guo, Emma Kindall, Natalie Yaw, Sam Karcher, Malin C. Wilkins, John S. McCloy, Adrien J. Terricabras, Scarlett Widgeon Paisner, Arjen van Veelen, Hongwu Xu, Joshua T. White |
| On-Site Speaker (Planned) |
Xiaofeng Guo |
| Abstract Scope |
New uranium fuels (including UC and UN) share several key characteristics with the industry standard uranium oxide. A fundamental understanding of the material chemistry and thermodynamic properties of uranium carbides and uranium nitrides is critical for predicting their behavior under reactor, off-normal, or storage conditions. In this work, we investigated (1) the thermal oxidation pathways of UC and UN by thermogravimetric analysis (TGA), and in situ X-ray diffraction (XRD) and ex situ X-ray absorption fine structure, (2) the high temperature structures and the thermal expansion coefficients (CTE) of UC and UN under oxidizing conditions, (3) the uncommon uranium carbide phases for their high temperature structures and CTE by in situ neutron diffraction, and (4) the potential U(CxO1-x)2 phase formation and equilibrium, with some thoughts about thermodynamic completeness of U-C-O system. |