NSUF 13-397: Atom Probe Tomography to Study Annealing Temperature Dependence on Krypton Bubble Clustering in Uranium Dioxide
It is widely known that microstructural changes influence the thermal performance of nuclear fuels. One mechanism that plays a pivotal role in the microstructural evolution of fuel is the formation and growth of insoluble fission products clusters, such as krypton (Kr) in uranium dioxide (UO2). Changes in the microstructure, specifically the addition of Kr bubbles, lead to a change in the efficiency of the transport of phonons or lattice vibrations. Atomic level experiments are needed to help explain the role annealing temperature play on the growth of Kr bubbles, which alter fuel chemistry and thus the thermal transport properties in UO2. The objective of this proposed research is to study the effect of fission product formation on the microstructure of nuclear fuel. The goal is to elucidate the fundamental material-physics underlying the connection between the fission products segregation and microstructural evolution. The proposed research utilizes atom probe tomography (APT) to study Kr segregation in polycrystalline UO2. In order to characterize the precise chemical and spatial distributions of Kr bubble clusters in UO2, laser-assisted atom probe tomography (APT) in conjunction with the focused ion beam (FIB) system available at CAES will be used. The FIB system will be used to prepare site-specific samples to fabricate atom probe tips. Each sample analyzed will be reconstructed using the IVAS software (available both at CAES and PI Manuel’s laboratory at the University of Florida) to study the Kr bubble segregation in UO2. Samples will be studied in the late Fall or early Winter 2012. Final results will then be published in peer- reviewed journal articles and presented at nuclear-fuels related conferences. It is expected that these results will provide new insight into the spatial and chemical distribution of Kr bubbles in UO2, allowing for the correlation with atomic-level simulations and/or the ability to link with mesoscale structure-property relationships.
ข้อมูลเพิ่มเติม
| ฟิลด์ | ค่า |
|---|---|
| Awarded Institution | University of Florida |
| Embargo End Date | 2026-02-27 |
| Facility Tech Lead | Mukesh Bachhav |
| NSUF Call | FY 2013 RTE Solicitation |
| PI | Michele Manuel |
| Project Member | Dr. Jian Gan, Research Scientist - Idaho National Laboratory (https://orcid.org/0000-0002-9121-4164) |
| Project Member | Dr. Michele Manuel, Professor and Chair - University of Florida (https://orcid.org/0000-0002-3495-7826) |
| Project Member | Billy Valderrama - University of Florida |
| Project Member | Hunter Henderson - University of Florida |
| Project Type | RTE |
| Publication | Fission Products in Nuclear Fuel: Comparison of Simulated Distribution with Correlative Characterization Techniques Todd Allen, Anter EL-AZAB, Jian Gan, Lingfeng He, Hunter Henderson, Michele Manuel, Billy Valderrama, Clarissa Yablinsky Microscopy and Microanalysis 2012-08-04 - 2012-08-08 |
| Publication | Bubble, stoichiometry, and chemical equilibrium of krypton-irradiated UO2 Todd Allen, Anter EL-AZAB, Jian Gan, Mahima Gupta, Lingfeng He, Michele Manuel, Janne Pakarinen, Billy Valderrama, Andrew Nelson Journal of Nuclear Materials 456 2015-01-01 https://www.sciencedirect.com/science/article/pii/S0022311514006163?via%3Dihub#ak005 |
| Publication | Influence of instrument conditions on the evaporation behavior of uranium dioxide with UV laser-assisted atom probe tomography Jian Gan, Billy Valderrama, Hunter Henderson, Michele Manuel Journal of Nuclear Materials 459 2015-04-01 http://dx.doi.org/10.1016/j.jnucmat.2014.12.119 |
| RTE Number | 397 |