FIELD: protection of fast reactor core cover. SUBSTANCE: method for protecting structure against molten efflux metal which is strong reducing agent involves filling core subject to effect of efflux metal with balls of protective material inert to molten metal. Material layer should be of cellular structure and cells between balls should communicate to form space receiving molten metal; balls are made of aluminium oxide; they are homogeneous and nonporous, and their diameter is 5 to 50 mm; volume of cells relative to that of balls is 20 to 70%. EFFECT: improved safety of fast reactor. 5 cl, 1 dwg
