Molten uranium dioxide structure and dynamics
Abstract
Uranium dioxide (UO2) is the major nuclear fuel component of fission power reactors. A key concern during severe accidents is the melting and leakage of radioactive UO2 as it corrodes through its zirconium cladding and steel containment. Yet, the very high temperatures (>3140 kelvin) and chemical reactivity of molten UO2 have prevented structural studies. In this work, we combine laser heating, sample levitation, and synchrotron x-rays to obtain pair distribution function measurements of hot solid and molten UO2. The hot solid shows a substantial increase in oxygen disorder around the lambda transition (2670 K) but negligible U-O coordination change. On melting, the average U-O coordination drops from 8 to 6.7 ± 0.5. Molecular dynamics models refined to this structure predict higher U-U mobility than 8-coordinated melts.
- Authors:
-
- Argonne National Laboratory (ANL), Argonne, IL (United States); Stony Brook Univ., Stony Brook, NY (United States); Materials Development Inc., Arlington Heights, IL (United States)
- Stony Brook Univ., Stony Brook, NY (United States)
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Materials Development Inc., Arlington Heights, IL (United States)
- Carnegie Inst., Washington, DC (United States)
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1174101
- Report Number(s):
- BNL-107388-2015-JA
Journal ID: ISSN 0036-8075; R&D Project: LS001
- Grant/Contract Number:
- SC00112704
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Science
- Additional Journal Information:
- Journal Volume: 346; Journal Issue: 6212; Journal ID: ISSN 0036-8075
- Publisher:
- AAAS
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Skinner, L. B., Parise, J. B., Benmore, C. J., Weber, J. K.R., Williamson, M. A., Tamalonis, A., Hebden, A., Wiencek, T., Alderman, O. L.G., Guthrie, M., and Leibowitz, L. Molten uranium dioxide structure and dynamics. United States: N. p., 2014.
Web. doi:10.1126/science.1259709.
Skinner, L. B., Parise, J. B., Benmore, C. J., Weber, J. K.R., Williamson, M. A., Tamalonis, A., Hebden, A., Wiencek, T., Alderman, O. L.G., Guthrie, M., & Leibowitz, L. Molten uranium dioxide structure and dynamics. United States. https://doi.org/10.1126/science.1259709
Skinner, L. B., Parise, J. B., Benmore, C. J., Weber, J. K.R., Williamson, M. A., Tamalonis, A., Hebden, A., Wiencek, T., Alderman, O. L.G., Guthrie, M., and Leibowitz, L. Fri .
"Molten uranium dioxide structure and dynamics". United States. https://doi.org/10.1126/science.1259709. https://www.osti.gov/servlets/purl/1174101.
@article{osti_1174101,
title = {Molten uranium dioxide structure and dynamics},
author = {Skinner, L. B. and Parise, J. B. and Benmore, C. J. and Weber, J. K.R. and Williamson, M. A. and Tamalonis, A. and Hebden, A. and Wiencek, T. and Alderman, O. L.G. and Guthrie, M. and Leibowitz, L.},
abstractNote = {Uranium dioxide (UO2) is the major nuclear fuel component of fission power reactors. A key concern during severe accidents is the melting and leakage of radioactive UO2 as it corrodes through its zirconium cladding and steel containment. Yet, the very high temperatures (>3140 kelvin) and chemical reactivity of molten UO2 have prevented structural studies. In this work, we combine laser heating, sample levitation, and synchrotron x-rays to obtain pair distribution function measurements of hot solid and molten UO2. The hot solid shows a substantial increase in oxygen disorder around the lambda transition (2670 K) but negligible U-O coordination change. On melting, the average U-O coordination drops from 8 to 6.7 ± 0.5. Molecular dynamics models refined to this structure predict higher U-U mobility than 8-coordinated melts.},
doi = {10.1126/science.1259709},
journal = {Science},
number = 6212,
volume = 346,
place = {United States},
year = {Fri Nov 21 00:00:00 EST 2014},
month = {Fri Nov 21 00:00:00 EST 2014}
}
Web of Science
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