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Neutronic performance is investigated for a potential accident tolerant fuel(ATF),which consists of U$_3$Si$_2$ fuel and FeCrAl cladding. In comparisonwith current UO$_2$-Zr system, FeCrAl has a better oxidation resistance but alarger thermal neutron absorption cross section. U$_3$Si$_2$ has a higherthermal conductivity and a higher uranium density, which can compensate thereactivity suppressed by FeCrAl. Based on neutronic investigations, a possibleU$_3$Si$_2$-FeCrAl fuel-cladding systemis taken into consideration. Fundamentalproperties of the suggested fuel-cladding combination are investigated in afuel assembly.These properties include moderator and fuel temperaturecoefficients, control rods worth, radial power distribution (in a fuel rod),and different void reactivity coefficients. The present work proves that thenew combination has less reactivity variation during its service lifetime.Although, compared with the current system, it has a little larger deviation onpower distribution and a little less negative temperature coefficient and voidreactivity coefficient and its control rods worth is less important, variationsof these parameters are less important during the service lifetime of fuel.Hence, U$_3$Si$_2$-FeCrAl system is a potential ATF candidate from a neutronicview.

Neutronic Analysis on Potential Accident Tolerant Fuel-Cladding Combination U$_3$Si$_2$-FeCrAl