b'SEM .Scanning Electron MicroscopySERTTA .Static Environment Rodlet Transient Test Apparatus SFF Sodium Free Fuel SFR .Sodium Fast ReactorSI .Structural Integrity SiC .Silicon CarbideSMR .Small Modular ReactorSNC . Southern Nuclear Company SNM .Special Nuclear Materials SP .State PointSTEM Scanning Transmission Electron MicroscopySTEP Systematic Technology Evaluation ProgramSTS Secure Transport ServicesTAVA Time-average, Volume-averageTC .Thermal coupleTCM Thermal Conductivity MicroscopeTEM .Transmission Electron MicroscopytFGR Transient Fission Gas ReleaseTHOR Temperature Heat Sink Overpower ResponseTHOR-C .THOR CommissioningTHOR-M .THOR MetallicTREAT Transient Reactor Test FacilityTRISO Tristructural IsotropicTWIST .Transient Water Irradiation System in TREATU UraniumUBr .University of BristolUCB .University of California Berkeley UCO .Uranium OxycarbideUHT .Ultra-high Temperature 240 2023|AFC ACCOMPLISHMENTS'