b'RD&D Research, Development, and DemonstrationREWS Rodlet Endcap Welding SystemRIA .Reactivity-Initiated Accident RPI.Rensselaer Polytechnic Institute RT .Room TemperatureSATS .Severe Accident Test StationSEM Scanning Electron MicroscopySERTTA .Static Environment Rodlet Transient Test Apparatus SETH Separate Effects Test HolderSFR .Sodium Fast ReactorSiC Silicon CarbideSPERT Special Power Excursion Reactor TestSTEM .Scanning Transmission Electron MicroscopyTD.Theoretical DensityTE .Total ElongationTEM .Transmission Electron MicroscopyTESB TREAT Experiment Support BuildingTHOR .Temperature Heat sink Overpower ResponseTIG . Tungsten Inert GasTm .Top Middle TM . Temperature MonitorTMS The Mineral, Metal and Materials SocietyTREAT Transient Reactor Test FacilityTRISOTri-structural IsotropicTWERL TREAT Water Environment Recirculating LoopUC Uranium CarbideUE .Uniform ElongationU.S. .United StatesUN .Uranium Nitride2020|AFC ACCOMPLISHMENTS 173'