Fuel Thermo-physical Characterization Project. Fiscal Year 2014 Final Report

Thermal properties of U–Mo alloys irradiated to moderate burnup and power

“…Similar montages were obtained for each of the other fuel segments analyzed [16]. These montages were utilized to obtain thickness measurements over the sample length, as indicated in the figure.…”

Assessment of effective thermal conductivity in U–Mo metallic fuels with distributed gas bubbles

“…The scattered simulation points are due to different runs for a system with the same gas bubble volume fraction but different spatial and size distributions of gas bubbles. The ''star'' symbol again represents the experimental data [33]. It can be seen that the experimental data follow in the region between the predicted upper and lower bounds of effective thermal conductivity.…”

“…Fig. 4 shows the created gas bubbles within different recrystallization zones with the average gas bubble size and density observed experimentally [33]. It should be pointed out that the proposed method only provides one way to define recrystallization zones in a three dimensional polycrystal.…”

“…Table 1 lists the mean radius and density at different fission densities. The measurements were estimated from data reported in reference [31,32] and optical microscopy images [33].…”

“…The dashed line schematically directs the changes of f cov and K G during the operation process (f cov increases while K G decreases). The symbol ''star'' presents the experimental data for three different burnup stages [33], i.e., before recrystallization, partial recrystallization and full recrystallization. In previous calculations, only the intra-and inter-granular gas bubbles were considered.…”