Multiphysics modeling of accident tolerant fuel-cladding U3Si2-FeCrAl performance in a light water reactor

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)106-116
Journal / PublicationNuclear Engineering and Design
Online published20 Feb 2018
Publication statusPublished - 15 Apr 2018


The performance of the proposed advanced fuel-cladding system U3Si2-FeCrAl was studied based on the suggestion that U3Si2-FeCrAl system is a potential accident tolerant fuel candidate from a neutronics assessment. The U3Si2 fuel was reported with a number of advanced thermophysical properties and FeCrAl alloy was reported with a better oxidation resistance and a larger thermal neutron absorption cross section. This study presents the development of a model for U3Si2-FeCrAl combination system by the modification of our CAMPUS code. Then the fuel performance was compared with UO2-Zircaloy, UO2-FeCrAl and U3Si2-Zircaloy systems. And finally sensitivity analysis has been performed on the fuel input parameters of UO2 fuel and cladding thickness of FeCrAl cladding. The U3Si2-Zircaloy system was found to decrease the fuel centerline temperature dramatically but with a very early gap closure time due to the large thermal expansion coefficient of U3Si2 fuel, while the U3Si2-FeCrAl system was found to not only decrease the fuel centerline temperature a lot, but also further delay the gap closure time, which would delay the pellet-cladding mechanical interaction time. Sequentially, the fission gas release and plenum pressure were also found to be decreased a lot. Then the nuclear reactor safety is expected to be improved by applying the U3Si2-FeCrAl system.

Research Area(s)

  • Accident-tolerant fuel, FeCrAl alloy, Fuel performance, U3Si2 fuel