Molecular dynamics study of Xe bubble re-solution in UO2

► The re-solution process of Xe atoms from intragranular bubbles was studied. ► Re-solution due to primary knock-on atom (PKA) and thermal spike (TS) was considered. ► The analysis shows that TS are much more effective at re-solution than are PKAs. ► The number of re-solved atoms by TS is independent of the bubble size and pressure.