Abstract
Zirconium alloys have good neutron economy and corrosion resistance in high temperature water and this has led to extensive usage of these alloys in CANDU reactors. However, during neutron irradiation, dimensional changes occur in zirconium components due to the rearrangement of atoms knocked from their lattice sites by fast neutrons. This “irradiation growth” may limit the lifetime of some reactor components and an understanding of the variables that control the process is of commercial importance.It is believed that dislocations and dislocation loops act as sinks for the displaced atoms and thus control the direction and magnitude of the strain through their Burgers vector. A knowledge of the irradiation-induced dislocation structure is therefore required.
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