b'2019 | ANNUAL REPORTFigure 1. Measured Youngs modulus versus burnup. Red square represents the average of the six indentations from this work. Black circles represents publisheddata on irradiated ceramic fuels. [37]The hardness value was calculatedchecked only once the PI 88 is according to Equation 3: removed from the scanning electron microscopy chamber at the end of the measurement campaign. Secondary electron images were collected with the FEI Quanta following indenta-tion tests to evaluate the imprints. The measured elastic modulus of the where H (Pa) is the sample hardness,nanoindentation work can be seen F max(N) is the maximum load, and A c in Figure 1, compared with available (m2) is the indentation area. literature data. As the PI 88 stage holds the sample surface parallel to the electron beam, the indentation imprint could be 73'