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Meeting MS&T23: Materials Science & Technology
Symposium Emergent Materials Under Extremes and Decisive In Situ Characterizations
Presentation Title In Situ Characterization and Modeling of Spent UO2 Fuel under Ion Irradiation
Author(s) Lingfeng He, Yunyuan Lu, Cameron Howard, Chao Jiang, Sudipta Biswas, Dewen Yushu, Jatuporn Burns, Wei-Ying Chen
On-Site Speaker (Planned) Lingfeng He
Abstract Scope Spent nuclear fuel undergoes significant microstructural and chemical changes during reactor operations. Some fission products remain in solid solution within the UO2 matrix, while inert gases such as xenon (Xe) and krypton (Kr), as well as metals in the 4d group (molybdenum, technetium, ruthenium, rhodium, and palladium), form nanoprecipitates within the UO2 matrix. Kr/Xe precipitates and metallic precipitates can also form a pair structure at the rim regions of the UO2 fuel. Additionally, grain subdivision of UO2 occurs above certain burn-up levels, resulting in the formation of a high burn-up structure (HBS) composed of nanograins. This study characterizes the in situ microstructural evolution of nanoprecipitates and HBS under Kr or Xe ion irradiation in spent UO2 fuel using transmission electron microscopy techniques. Density-functional theory and phase-field modeling are also utilized to better understand the in situ microstructural evolution of nanoprecipitates and grain growth in UO2.


Capturing Laser Induced Dynamics of Materials via Single-Shot Ultrafast Transmission Electron Microscopy
HP-XAFS and Its Application to Topological Insulator Bi2Te3
In-situ Observations of the High Temperature Melting Behaviour of Ce-brannerite
In-situ Raman Studies on Synthesis and Oxidation of UC1-xNx
In-situ/Operando Characterization of Emerging Materials with MeV Ultrafast Electron Diffraction at SLAC National Accelerator Laboratory
In Situ Characterization and Modeling of Spent UO2 Fuel under Ion Irradiation
Irradiation Induced Structural and Thermal Conductivity Changes in Nuclear Fuels
Magnetic Scattering and Spectroscopy at High Pressures at APS and APS-U
Modulation of Structure-function Motifs in Optoelectronic Metal Halides Using High Pressure
Neutron Scattering for Studying Materials Under Extreme Conditions
Perspectives of IXS and NRS Studies in the APSU Era
Polar Magnets in High-Pressure Exotic Perovskites
Pressure-induced Non-monotonic Crossover of Steady Relaxation Dynamics in a Metallic Glass
Pressure Driving Dual-layer Superconductivity in 4Hb-TaSe2 TMD
Structural Manipulation of Ceramic Materials via Extreme Conditions
Will High-entropy Carbides Be Enabling Materials for Extreme Environments?

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