Comportement de quelques materiaux envisageables dans un reacteur nucleaire a sels fondus

Resume This work presents a set of experiments aimed at an evaluation of the behaviour of different materials in contact with liquid or solid media likely to be encountered in a molten salt nuclear reactor. The main results are as follows: • graphite can be used to build test loops working for thousands of hours in the presence of molten fluorides; • low-alloyed steels may be used in the presence of solid fluorides without risk of severe corrosion; • the simultaneous presences of carbon materials and metallic alloys in contact with molten fluorides may give rise to mass transfers; • no noticeable galvanic coupling effect is observed at 550°C between liquid lead and steels in the presence of molten fluorides; • the phenomena involved in the wetting of steels in contact simultaneously with liquid lead and molten fluorides develop with time, though it seems that at equilibrium a steel surface is wetted more by lead than by fluorides.