| About this Abstract |
| Meeting |
Materials in Nuclear Energy Systems (MiNES) 2021
|
| Symposium
|
Materials in Nuclear Energy Systems (MiNES) 2021
|
| Presentation Title |
Defect Clustering in UO2 Doped Systems Studied Using XAS and Neutron Scattering |
| Author(s) |
Arjen van Veelen, Joshua T. White, Tashiema L. Ulrich, Scarlett Widgeon Paisner, Tarik A. Saleh |
| On-Site Speaker (Planned) |
Arjen van Veelen |
| Abstract Scope |
Uranium Dioxide (UO2) is the dominant fuel that powers nuclear reactors. UO2 fuel microstructure, in particular grain size, is known to affect both creep and fission gas release behavior which improves fuel lifetime and stability. Several additives have been recognized to enhance grain growth, of which Cr has been put forth by industry. The addition of Cr increases the grainsizes from 10 (± 3 µm) to 35 (± 5 µm). The dissolution of Cr into the UO2 lattice is strongly dependent on temperature and oxygen potential during sintering. Cr doping results in lattice contraction due to the introduction of structural defects. Additionally, Cr can potentially be accommodated on the uranium site at low temperatures and low concentrations. We used state-of-the-art X-ray Absorption Spectroscopy combined with X-ray and Neutron Diffraction to study the defect structures of Cr-doped and undoped UO2. We will discuss the Cr-doping effects on the UO2 defect chemistry. |
| Proceedings Inclusion? |
Undecided |