[en] Peculiarities of radiation swelling of austenite chromium- nickel steels and alloys depending on nickel content in them and peculiarities of structural transformations at early stages of decomposition of solid solutions are considered. High resistivity to vacancy swelling of high-nickel austenite alloys is explained by reinforcement of recombination of point defects in elastic-distorted regions formed on the boundary surface preextraction-matrix. Resistivity to radiation swelling of alloys and steels of hcp and vcp lattices is analyzed. It is supposed that high resistivity of these materials to radiation swelling should be also connected with peculiarities of flowing early stages of decomposition