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Thermophysical and Mechanical Analyses of UO2-36.4vol % BeO Fuel Pellets with Zircaloy, SiC, and FeCrAl Claddings

1 and 1,2,*
1
Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Hong Kong 999077, China
2
Center for Advanced Nuclear Safety and Sustainable Development, City University of Hong Kong, Hong Kong 999077, China
*
Author to whom correspondence should be addressed.
Metals 2018, 8(1), 65; https://doi.org/10.3390/met8010065
Received: 31 October 2017 / Revised: 14 January 2018 / Accepted: 15 January 2018 / Published: 18 January 2018
(This article belongs to the Special Issue Zirconium Alloys)
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PDF [2146 KB, uploaded 18 January 2018]
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Abstract

The thermophysical performance and solid mechanics behavior of UO2-36.4vol % BeO fuel pellets cladded with Zircaloy, SiC, and FeCrAl, and Zircaloy cladding materials coated with SiC and FeCrAl, are investigated based on simulation results obtained by the CAMPUS code. In addition, the effect of coating thickness (0.5, 1 and 1.5 mm) on fuel performance and mechanical interaction is discussed. The modeling results show that Zircaloy claddings are more effective in decreasing fuel centerline temperature and fission gas release than other kinds of cladding material because of the smaller gap between cladding and fuel at the same burnup. SiC claddings and SiC-coated Zircaloy claddings possess smaller plenum pressure than other kinds of cladding. SiC claddings contribute more to fuel radial displacement but less to fuel axial displacement. FeCrAl claddings exhibit very different radial and axial displacements in different axial positions. FeCrAl-coated Zircaloy claddings have a lower fuel centerline temperature than Zircaloy claddings at burnup below 850 MWh/kg U, but a higher fuel centerline temperature at higher burnup. The gap between FeCrAl-coated Zircaloy claddings and fuel pellets closes earlier than that of Zircaloy claddings. SiC-coated claddings increase fuel radial and axial displacements, and cladding axial displacements of inner and outer cladding surfaces. View Full-Text
Keywords: UO2-BeO; Zircaloy cladding; SiC cladding; FeCrAl cladding; surface-coated cladding; mechanical analysis UO2-BeO; Zircaloy cladding; SiC cladding; FeCrAl cladding; surface-coated cladding; mechanical analysis
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Zhou, W.; Zhou, W. Thermophysical and Mechanical Analyses of UO2-36.4vol % BeO Fuel Pellets with Zircaloy, SiC, and FeCrAl Claddings. Metals 2018, 8, 65.

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