b'Figure 4. Engineering stress-strainAccomplishments:barrier nor was the HT-9 cladding curves for in-situ SEM micro-tensileSEM characterization on the fuelpenetrated by fuel/fission products tests. The inserted table summarizescross-section (Figure 1a) confirmed(Figure 1a). Therefore, the Cr diffu-the measured yield strength (y-DIC), ultimate tensile strength (max), andthe occurrence of interactionsion barrier provided a good barrier ductility (total-DIC) for each test,between the Cr diffusion barrier andintegrity against interactions (inter-together with the average values forthe U-10Zr (wt%) fuel (Figure 1b-1g).diffusion) between the U-10Zr fuel the HT-9 specimens At the most interactive location,and HT-9 cladding under the studied more than half (~18.4m, #6 inirradiation testing condition.Figure 1g-1h) of the total thicknessTEM characterization the inter-(~27 m) of the Cr barrier has been consumed. Despite the interactionacting interface revealed interac-between Cr and Zr (and some U),tion in some Cr grain boundaries neither microcracks were detected(GBs, highlighted by red arrows in the preserved Cr diffusionin Figure 2a). The TEM composi-tional analysis on a selected region 168 2023|AFC ACCOMPLISHMENTS'