New helium equation of state for pressurized nanobubbles in UO$_2$: matrix calculated via molecular dynamics simulations
Résumé
During storage helium atoms accumulate in spent
fuel via a-decay. These helium atoms may cluster
into nanoscopic bubbles (c.f. opposite Figure),
which could change the physical properties of
spent fuel. To estimate the impact of such bubbles,
it is essential to possess a good thermodynamical
model for helium interacting with the surrounding
matrix including states at high pressures and
temperatures. Therefore, MD simulations are
carried out to establish a new equation of state
(EOS) for helium in nanobubbles embedded in UO$_2$
matrix.
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