Fig. 7
The impact of intragranular physics on the fission gas behavior in a 20 μm × 20 μm 2D polycrystal of UO2 with ten initial grains at 1800 K. The initial microstructure is shown in (a). The final microstructure (after 1389 days) for the no clustering and no re-solution case is shown in (b), for the clustering but no re-solution case is shown in (c), and for the clustering and re-solution case is shown in (d). The images are shaded by the local Xe molar fraction and the interfaces are shown in black. The evolution of the intergranular bubble fraction over time for the three cases is shown in (e), where the result from a stand-alone MARMOT simulation using an effective diffusion coefficient within the grains is shown for reference. The fraction of Xe found within the grains over time for the three cases is shown in (f)