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A completely static nuclear-powered thermoelectric generator is discussed. The reactor, designed for snap-10 (Systems for Nuclear Auxiliary Power), uses U235-zirconium-hydride fuel moderator and is capable of operating a thermoelectric generator at a hot-side temperature of 1,000 to 1,200 F (degrees Fahrenheit). A prototype thermoelectric generator is described which produced 250 watts of electric power at spacing operating temperatures. Waste-heat radiators for the system, having constant and tapering fin thicknesses, are discussed. Curves are presented of performance versus fin number and length for both tapered and constant-thickness fins. Weight and electric power capability of a present state-of-the-art thermoelectric generator-radiator system is presented in curve form and shows a 245-pound weight for a 250-watt system exclusive of the reactor and shielding.