[en] On the commission of the Nuclear Safety Project (KBS) corrosion tests have been carried out on unalloyed titanium, which is planned to be used as an outer corrosion resistant canister for reprocessed nuclear waste. Tests were conducted for 300 days in a corrosive medium of modified Baltic water at 100 and 130 degC with high (8 ppm) or a low (< 10 ppb) oxygen content. The tests at low oxygen content and 100 degC were continued for 600 days. Very low oxidation rates (0.01 - 0.1 μm/year) were obtained, corresponding to a life time of ten to hundred thousands of years for a 6 mm thick titanium canister. In spite of the considerably more severe corrosive contitions (higher temperature, higher chloride and fluoride contents as well as lower pH) compared with those estimated for the final disposal, no signs of localized corrosion were found, nor could any hydrogen pick-up be detected. (author)