An experimental reactor using UF/sub 6/ as fuel is described. The reactor is hetemogeneous, beryllium moderated, and graphite reflected. Using 9% enriched uranium, criticality was achieved at approximately atmospheric pressure. Possibilities of continuous plutonium and fission product extraction and of using the UF/sub 6/ as a coolant and prime mover are discussod. Photographs of the reactor are given. (W.D.M.)