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The Gas Turbine High-Temperature Gas Cooled Reactor (GT-HTGR) employs a power cycle that commences waste heat rejection at relatively high temperature, thus making the use of dry cooling economically attractive. This heat can also be utilized by a low temperature secondary cycle that generates additional power at no increase in fuel cost. A supercritical Rankine cycle employing ammonia as the working fluid meets the requirements for the secondary power cycle. To achieve best overall performance for the combined binary cycle the helium recuperator, and precooler proposed for the dry-cooled GT-HTGR will require modification. Ammonia desuperheats upon expansion through a turbine, and care must be exercised to select cycle conditions that do not result in moisture formation or excessive superheat in the secondary power turbine exhaust. The combined plant output is sensitive to heat sink conditions, and for once-through cooling a 3000-MW(t) binary cycle GT-HTGR produces a net output of 1378 MW(e), which corresponds to an efficiency of 45.9 percent. For evaporative cooling, the output and efficiency are 1353 MW(e) and 45.1 percent, respectively. The heat-rejection system accounts for a large portion of the secondary plant cost, and requires careful optimization while accounting for the effects on plant performance.

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