[en] The disposal of high level waste requires a series of barriers, one component of this system could be a metallic container having an endurance of 500 to 1000 years and permitting the waste to pass through its thermal period without any contact with the environmental medium. Safety demonstration relative to a steel container based on a limitation of the total weight loss and on kinetics of corrosion in deaerated solutions are presented. Elongation tests were run at 90⁰C in ground waters for hydrogen embrittlement. The concept of a thick-walled steel container is attractive, nevertheless, the lack of precision concerning the actual conditions in the container environment prevents the corrosion engineers from building satisfactory safety demonstration