Observations of flaking effects indicate a solubility limit below 1 at% evaluated between 0.1 and 0.5 at% ( Guilbert et al., 2003, 2004). Unlike the fission gases, helium is soluble in UO 2 to some extent. Only part of it is expected to be released within the free volumes. Helium produced over time by alpha decay within UOX and MOX fuels (47.5 GWd/t) ( Poinssot et al., 2000).
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