Hydrogen isotope permeability through austenitic Cr-Ni steels under neutron irradiation

Experimental data on permeability and diffusion of protium and deuterium through austenitic Cr-Ni steels 18Cr-10Ni-Ti, 16Cr-11Ni-3Mo-Ti and 25Cr-16Ni-6Mn-N-V are reported. The data were obtained with special equipment designed and installed at the research reactor IVV-2M. It was shown that parameters of hydrogen isotope transfer in Cr-Ni steels increased substantially during irradiation by fast neutrons of the flux density f < 1.8 x 10(18) n/m(2)s (E > 0.1 MeV). Radiation effects increase with a temperature decrease. Thus, at T < 673 K a relative increase of permeability can reach several orders with respect to its value. Deviations isotopic effects from their initial values and other radiation defects were observed.