When　introducing　a　new　fuel　concept　in　traditional　light　water　reactors　(LWRs),　analyzing　its　performance　under　a　variety　of　power　histories　while　attempting　to　simulate　its　stress　state　as　realistic　as　possible　is　desired.　By　having　access　to　such　capability,　the　fuel　developer　can　assess　the　safety　characteristics　of　the　new　fuel　concept　and　optimize　its　design　performance.　SiC/SiC　Ceramic　Matrix　Composite　(CMC)　with　chemically　vapor　deposited　(CVD)　SiC,　is　an　accident　tolerant　fuel　(ATF)　concept　owing　to　its　high　mechanical　strength　and　remarkably　enhanced　oxidation-resistance.　The　modeling　of　SiC　cladding　requires　capability　to　simulate　multilayers　and　capture　the　nonlinear　response　of　SiC　material　under　neutron　radiation.　In　addition,　considering　its　probabilistic　failure　characteristics,　efficient　running　fuel　performance　tools　are　required　to　assess　its　initial　safety　performance　and　optimize　its　design.　In　this　work,　we　added　a　multi-layer　deformation　model　in　FRAPCON-4.0　and　FRAPTRAN-2.0,　with　the　primary　motivation　to　analyze　the　performance　of　SiC　cladding　for　UO2,　annular　UO2　and　U3Si2　fuels　from　a　full　core　point-of-view.　We　then　performed　reactivity-initiated　accident　(RIA)　and　loss-of-coolant　accident　(LOCA)　for　the　limiting　rod.　During　normal　conditions,　the　failure　risk　of　SiC　cladding　is　mainly　determined　by　pellet-cladding　mechanical　interaction　(PCMI)　and　U3Si2　is　a　more　promising　fuel　compared　to　UO2.　While　promising　performance　was　simulated　during　LOCA　for　all　fuels,　during　RIA,　U3Si2　performance　was　found　to　be　likely　more　limiting　compared　to　UO2.　Results　show　that　the　full　core　simulation　methods　developed　for　this　work　are　robust　and　computationally　efficient　and　can　be　adopted　for　other　ATF　design　analysis.　Copyright　©　GLOBAL　2019　-　International　Nuclear　Fuel　Cycle　Conference　and　TOP　FUEL　2019　-　Light　Water　Reactor　Fuel　Performance　Conference.All　rights　reserved.