b'3.4 AR COMPUTATIONAL ANALYSISAR Computational AnalysisPrincipal Investigator: Pavel MedvedevThis effort is an exampleD evelopment of sodium-freeProject Description: metallic fuel design has beenTo fulfill the milestone requirements, postulated as an Advancedthe present summary provides of how award-winningFuel Campaign(AFC) goal. In thisa status update for performance computational tools areregard, one of the design optionsassessment of annular metallic fuel used to advance nuclearis annular U10Zr alloy fuel withusing BISON. This effort commenced fuel technology. 75% smeared density and stainlesson 03/02/2022. A generalized plane steel cladding. In accomplishingstrain model of annular U10Zr fuel this campaign goal, performancewas developed. The model represents assessment of this design providesa 0.230 diameter fuel pin. Annular basis for down selection decisions,fuel slug features 55% smeared identifies performance benefitsdensity and has an outer diameter or deficiencies, and identifies fuelof 0.195. In addition to thermoelas-development and testing needs.ticity, the model incudes fuel and Performance assessment includescladding creep and fuel swelling.calculation of fuel temperature, deformation and predicting fuel fail- Accomplishments: ures. At Idaho National Laboratory,Comparison of model results to the a fuel performance code BISON hasmetallography of the AFC-3A R4 been developed for these purposesis shown in Figure 1. Qualitative by the Nuclear Energy Advanceagreement of the simulation results Modeling and Simulation (NEAMS)and the experiment is demonstrated program. BISON is a winner of theby successful prediction of the 2021 RD 100 awards. fuel annulus closure and apparent absence of cladding strain. Future work will focus on modeling zirco-nium redistribution and extrapolation of the model to higher burnups and higher smeared densities.134 2022|AFC ACCOMPLISHMENTS'