Abstract
In situ and ex situ transmission electron microscopy observation of small Kr bubbles in both single-crystal and polycrystalline UO2 were conducted to understand the inert gas bubble behavior in oxide nuclear fuel. The bubble size and volume swelling are shown as weak functions of ion dose but strongly depend on the temperature. The Kr bubble formation at room temperature was observed for the first time. The depth profiles of implanted Kr determined by atom probe tomography are in good agreement with the calculated profiles by SRIM, but the measured concentration of Kr is about 1/4 of the calculated concentration. This difference is mainly due to low solubility of Kr in UO2 matrix and high release of Kr from sample surface under irradiation.
| Original language | English |
|---|---|
| Pages (from-to) | 125-132 |
| Number of pages | 8 |
| Journal | Journal of Nuclear Materials |
| Volume | 456 |
| DOIs | |
| State | Published - Jan 2015 |
| Externally published | Yes |
Funding
This work was supported as part of the Center for Materials Science of Nuclear Fuel, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under award number FWP 1356 . This work was also supported by the U.S. Department of Energy, Office of Nuclear Energy under DOE Idaho Operations Office Contract DE-AC07-051D14517, as part of an ATR National Scientific User Facility experiments. The Kr implantation was accomplished at the Electron Microscopy Center for Materials Research at Argonne National Laboratory, a U.S. Department of Energy Office of Science Laboratory operated under Contract No. DE-AC02-06CH11357 by UChicago Argonne, LLC.
| Funders | Funder number |
|---|---|
| Office of Basic Energy Sciences | FWP 1356 |
| U.S. Department of Energy Office of Science Laboratory | |
| U.S. Department of Energy | DE-AC07-051D14517 |
| Office of Science | |
| Office of Nuclear Energy | |
| Argonne National Laboratory |