b'Figure 2. (left) Scanning electronfrom the surface of a polished samplethan the corresponding calculated microscopy image of irradiatedand its use on the irradiated U-Zrconductivity which matches the bulk U-10 wt% Zr with locations of localfuel system produced the first ofvalue well and is likely due to sample thermal diffusivity measurements (red squares); (right) EDS image of Zrits kind values for local thermalsurface preparation and scattering of concentration (green areas) property measurements. Figure 1the instrument lasers by the surface compares the bulk thermal conduc- coating and the underlying micro-tivity and local thermal conduc- structure. Therefore, local thermal tivity measured across the radius ofdiffusivity data from the TCM is a fuel slug cross section of a freshmore reliable.MFF-3 sample. Additionally, it showsLocal thermal diffusivity measure-a calculation of the local thermalments were collected on an irradiated conductivity using Equation 1. MFF-3 U-10 wt% Zr sample from pin #193114. Figure 2 shows the location k = Cp(1) of TCM measurements and the irradi-ated microstructure zones created by where k is thermal conductivity,Zr migration and fission gas bubbles. Cp is specific heat at constantThe inset is an energy dispersive pressure, r is density, and a is localspectroscopy (EDS) map showing the thermal diffusivity measured onconcentrations of Zr in green. From the TCM. This comparison showstransmission electron microscopy that the TCM direct measurementdata collected for another study, of thermal conductivity is lowerzone 1 is mostly -UZr 2and zone 124 2022|AFC ACCOMPLISHMENTS'