In this paper, we discuss the feasibility of the application of the gaseous-core reactor to electric-power-generation systems. An analysis of the radiation-heat-transfer process in the gaseous core is presented. The results of this analysis are then combined with an estimate of the quantity of uranium required for criticality to determine the core pressure and temperature for various values of power generation and core diameters. This analysis indicated that attractive power levels in reactors of practical size can be obtained with gas pressures and wall temperatures within the potential capability of known structural materials. As an example, it is estimated that a spherical gaseous-core reactor with a radius of 152.4 cm would generate ∼4000 MW(th) with a gas pressure of ∼11 atm. Several configurations of the gaseous-core reactor employing thermionic converters and heat pipes are described.