Abstract
This paper gives a brief review of the important phenomena observed in metallic uranium and ceramic nuclear fuels during irradiation in reactors. The mechanism of irradiation growth, irradiation creep and swelling which are responsible for the dimensional instability of uranium has been described. Important phenomena observed in ceramic nuclear fuels,e.g. fuel densification, fuel restructuring, plutonium segregation, oxygen and fission product migration, irradiation creep, fission gas release and swelling have been discussed. A brief note is included on computer modelling for prediction of fuel element irradiation behaviour.
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