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Sectioned at Mid-Plane *Fine-Weave Pierced Fabric, a 90%-dense 3D carbon-carbon composite *Carbon-Bonded Carbon Fibers, a 10%-dense high-temperature insulator *62.5-watt 238 Pu02 pellet • RTPV heat source consists of two GPHS modules, identical to those used on Galileo, Ulysses, and upcoming Cassini missions. • This is a 60% reduction from the five modules used in the RTG design for PFF. • GPHS modules have undergone very extensive safety analyses, tests, and reviews.' These need not be repeated as long as the PFF launch vehicle is no more severe than the Shuttle or Titan-4. *

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