Abstract
There is a correlation between the existence of c- component defects and accelerated irradiation growth of annealed Zr and Zircaloy-2 and -4. Analysis shows that these defects are vacancy, basal plane dislocation loops having Burgers vectors of b = 1 6 〈202̄3〉. Their formation is related to the solute content of the Zr (either as an impurity or as an alloying element) and, in many cases, appears to be dependent on the dissolution of intermetallic particles during irradiation. This could account for why irradiation growth of annealed Zircaloys increases at high temperatures and why there is an incubation period for the onset of accelerated or “Breakaway” growth, i.e. because fluence and temperature are factors governing the extent of solute dissolution.
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