completed by September 1995. The GFS design validation review and document are all scheduled to be completed the end of FY 1995. The GFS design validation documentation will show all the GES data in relationship to the design parameters predicted for the GFS design. The final documentation will include a recommended technical specification to be used for any thermoelectric space reactor power system for future space applications in the power range 10-1000 kWe. The SP-100 GES Project status to date is summarized below under the system and each of the eight GFS subsystems. GFS Description A simple schematic of the SP-100 GFS and its eight subsystems are shown in Fig. 4. The reactor subsystem is the heat source where a controlled nuclear reaction produces thermal power at high temperatures for 10 years. The reactor instrumentation and control subsystem consists of temperature and neutron sensors, control element and safety rod actuators, and the computer hardward and software necessary to control the reactor thermal power in accordance with the operational power requirements necessary to accomplish the mission over a 10-year period. The shield subsystem consists of materials configured to create the lowest mass possible that will reduce the neutron and gamma flux emitted from the reactor to the required operational level at the mission payload over the 10-year mission lifetime. The heat transport subsystem includes the coolant, piping, TEM pump and gas separator/accumulator which are necessary to transfer the high temperature thermal power from the reactor to the hot side of the thermoelectric heat-to-electric converter.
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