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It is intended to describe the swelling characteristics of fissile pins clad with solution annealed 316 and irradiated in the fast reactors RAPSODIE and PHENIX.
On these materials the effects of the irradiation parameters (damage rate, time and temperature) and of the chemical composition of the steel before irradiation have been investigated.
Schematically the swelling may be represented by a linear function of the damage after an incubation period which depens mainly on the temperature below about 500 °C. Above this temperature there is an increase of the steady state swelling rate and the incubation damage depends on damage rate.
Below 500 °C, the elements known to inhibit swelling (C, Si, Ni) act through an increase of the incubation damage. At higher temperature, their effect tends to fade out.
The experimental findings on the swelling of the pins are consistent with the observations on the electron microscope made on the same materials, reported by V. LEVY et al. at this Conference.
radiation, swelling, stainless steels, cladding, fast reactors, damage rate effect