The nuclear gas-turbine plant has recently become the basis for a substantial development program. Because of considerable difficulties, particularly in the areas of heat and radiation-resistant materials, from 5 to 7 years must elapse before any real accomplishment can be demonstrated. The most attractive line of development from a cost, efficiency, and weight point of view, appears to be the single-fluid gas system, discussed in detail. The case for the optimum gas is not clear-cut. Thermodynamic, system, and bearing and seal problems are considered.

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