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Irradiation growth due to fast neutron bombardment has been measured in textured Zircaloy 2 as a function of neutron dose (ϕt) and irradiation temperature. The growth strain ε obeys a relationship ε∝ (ϕt)n over a temperature range -196 to 280 C and for doses up to 1021 n/cm2. For irradiation temperatures up to 80 C, n = 0.4; but at 280 C, n = 0.7. The temperature dependence of irradiation growth in Zircaloy 2 is small, and in the temperature and dose ranges considered the growth strains do not differ by more than a factor of four. The growth rate G∝d ε/d (ϕt) is initially large at low doses but approaches 1 at high doses (∼;1021 n/cm2).
irradiation, neutron irradiation, neutron flux density, temperature, strains, strain rate, crystal lattices, grain structure, interstitials, volume, Zircaloys, nuclear reactor materials, pressurized water reactors, texture, elongation, pressure vessels
Berkeley Nuclear Laboratories, Berkeley, Gloucestershire