b'of a kind and important insight oncentral part has a higher concentrationFigure 1. Backscatter electron montage the performance of the previouslyof Zr compare to the as-fabricatedimage of half fuel cross-section of described innovative fuel design. composition which means that Zr/UU-10Zr annular fuel irradiated as part of AFC-3D experiment to a burnup The microstructure of U-10Zr annularredistribution has occurred as expected,of 4.3 %FIMA. In the image, different fuel is visible in Figure 1 and presentsin line with the metallic fuel literature.microstructures across the radius are In the outer region the Zr content isvisible and Zr-redistribution is also different degree of porosity along thelower and the porosity is somewhatindicated as high Zr region and low radius. The inner band shows roundZr region.and large porosity and a predominantsmaller and elongated. Finally, there is single fuel phase that during reactorno evidence of wastage inside the clad-operation was likely gamma-(U,Zr)ding as part of the FCCI region.phase (temperature higher than 650Overall, this U-10Zr annular fuel has C) [1]. From energy dispersive X-rayshown good performance in line spectroscopy (EDS) analyses, thiswith the well-known U-10Zr, sodium 2020|AFC ACCOMPLISHMENTS 135'