b'Figure 2. Relative Radial Power Distributions for Full and Half-Diameter UO 2Fuel Pellets.LHGR of 320 w/cc.In order to matchthat incorporates these neutronic the LHGR of a nominal fuel pelletresults. Analyses of accelerated for a LHGR of 320 w/cc with anburnup configurations such as those enrichment of 4.95 w/o with a half- shown here can be used to help diameter pellet the enrichment haddevelop meaningful figures-of-merit to be increase to 28 w/o. The three(FOM) to ensure that configurations curves show the relative radial powerthat accelerate the burnup accumula-distributions for the nominal pellettion in test fuels actually provide data at 370-days/20.3-GWd/t and for thethat are sufficiently representative of half-diameter pellet at 370-days/85- expected fuel performance and can GWd/t and 80-days/20.3-GWd/t.be used to support assessments of These results illustrate the difficultyperformance and accident behavior, in connecting the results from theand licensing activities.This will full and reduced diameter irradiationslikely be a useful tool/approach to to provide meaningful data on fueldemonstrate/qualify ATF fuels, and performance which will obviouslyfuels for higher burnups beyond those require fuel performance modelingcurrently licensed.124 2020|AFC ACCOMPLISHMENTS'