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Problems of lubrication of mechanisms associated with on-load refueling of CO2-cooled reactors are examined; review of some possible solid lubricants is given, with indication of temperature ranges within which they are usable; results of friction and endurance tests on sprayed films of unbonded MoS2, WS2, and graphite; WS2 was most promising lubricant at 400 C, whereas MoS2 was best at 200 C; experiments on some hot-pressed composite materials containing metallic (nickel) matrix and lubricant powder (tungsten diselenide or calcium fluoride) are described; none of formulations tested was fully satisfactory at 100 or 400 C. (19596)