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The cavity depth distributions in advanced ferritic/martensitic and austenitic 316 steels were characterized after irradiation with Ni ions at 580 °C to peaked damage of ~300 dpa and 13,000 appm preimplanted helium. The swelling depth distributions for the 316 austenitic steel were determined to be ~0.0148%/dpa in helium preirradiation region, ~0.1761%/dpa in transitional region, and ~0.0363%/dpa in peak region, respectively. Inhibitory effect of swelling was observed in the peaked dpa region due to the defect imbalance. In contrast, high-level heavy ion damage was insufficient to induce the formation of voids in the helium-free region for the advanced ferritic/martensitic steel, but high density of helium bubbles with the swelling rate of ~0.0086%/dpa occurred in the helium preirradiation region. For the reduced-activation ferritic/martensitic steel, in comparison with the transitional and peak regions, preinjection …