MRSR Power System Concepts Four different isotope power system concepts have been evaluated in this study: the GPHS-RTG, the Mod-RTG, closed Brayton cycle DIPS and the free-piston Stirling engine DIPS. Each concept is briefly described and performance characteristics for a 500 We system are given. GPHS-RTG The GPHS-RTG (Fig. 3) is basically a finned assembly of thermoelectric elements enclosing a stack of GPHS blocks and radiatively coupled to them. Heat flow is outward; the elements take advantage of the temperature difference between the
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