b'Handbook on Accident Tolerant Fuel Doped UO 2PropertiesPrincipal Investigator: Adrien J. Terricabras Team Members/Collaborators: Sean Drewry, Maria Kosmidou, Darrin Byler, Joshua T. WhiteD oped UO 2fuels are anthe fission gas release behavior as industrial relevant Accidentwell as enhance the creep behavior Tolerant Fuel (ATF) owingof UO 2 . However, many of the to the ability of this class of fuelsthermophysical properties are to offset fission gas release into thesparse in the literature and have plenum as well as purported ther- a wide scatter for what has been momechanical benefits to minimizepublished. Furthermore, many of pellet clad mechanical interactions.the published literature do not accu-Work this year completed effortsrately report the Cr concentration to summarize a suite of thermo- of the as fabricated pellets, making physical properties and microstruc- comparison across multiple sources tural characterizations on Cr-dopeddifficult to ascertain conclusions. UO 2 . This work is summarized inThis is further compounded by the a non-proprietary handbook ofproprietary nature of the fabrication interest to the Nuclear Advancedroutes from industry which have Modeling and Simulation commu- now been emulated at Los Alamos nity as well as the Nuclear Regula- National Laboratory (LANL) to tory Commission. Work describedproduce reasonable grain sizes like herein details the initial draft of awhat is available in the literature to handbook on near term ATF dopedprovide confidence in the structure-UO 2fuel starting with the fresh fuelprocessing-property-performance characterization which is plannedrelations. The above datasets have to be enhanced with follow onbeen compiled into the initial draft post irradiation examination (PIE)handbook on doped UO 2ATF, which studies and transient/accident tests. is expected to be expanded upon in future FYs, summarizing on-going Project Description: efforts within the Advanced Fuels Due to the proprietary nature of ATFCampaign (AFC) at PIE facilities as datasets, this project was initiated towell as irradiations at test reactors.create an open database for regula-tory entities to verify models beingAccomplishments:developed by industry partners inThe work supported under this support of their ATF qualificationwork package has resulted in campaigns. For the purposes of thistwo milestone reports: M3FT-project, Cr-doped UO 2was chosen23LA0202010110 (submitted May as there is relevance to multiple2023) and M2FT-23LA020201011 industry teams. The Cr-dopant is(submitted September 2023). The added to promote grain growth inwork accomplished here summa-UO 2which is purported to improverizes new and existing experimental 40 2023|AFC ACCOMPLISHMENTS'