The laboratory for reactor physics and systems behaviour (LRS) of the Paul Scherrer Institute (PSI) is developing methods and models for multi-physics multi-scale best estimate safety analyses with uncertainty quantifications and sensitivity analyses (UQ/SA). Although primary emphasis of these developments has so far been given to reactor physics and thermal-hydraulics, enlargement to fuel thermo-mechanical analyses was also recently launched. As first step in that context, a coupling of FALCON with the URANIE UQ/SA platform was established and assessed for steady-state base irradiation in the framework of the OECD/NSC/WPRS UAM-II benchmark. In this paper, the application of FALCON/URANIE is enlarged to transient simulations by analyzing the recently conducted OECD/CSNI/WGFS fuel code benchmark on reactivity initiated-accidents (RIA). Overall FALCON simulation results agree with averaged results of other participants in the benchmark in terms of evolution of fuel and clad thermo-mechanical properties along with the ranking of the most influential uncertainty sources. This opens the way to future applications of UQ/SA methodology to FALCON simulations of more realistic and applied transient case studies.