defined interfaces. The cell components are the electrical insulator, compliant pad, electrode and thermoelectric couple. The insulator has made excellent progress and accelerated life tests have verified greater than 10-year analytical lifetime predictions. The compliant pad fabrication development has progressed very well with experimental verification of the analytical codes that are used to predict compliancy forces versus displacement. Electrodes are being bonded to the silicon germanium (SiGe) thermoelectric material which meet the short-term requirements, and the ongoing effort is to extend the initial low electrical resistance from hundreds of hours to 10 years. Some n- type improved SiGe thermoelectric material has been fabricated which gives a better performance than required. The />-type improved SiGe has not shown the required performance to date. The status of all the other components is presented in this paper. The SP-100 Phase II project progress has been slower than planned due to shortfalls in the requested annual budgets. The SP-100 Phase II project is now planned to be completed by the end of FY 1995. Introduction The goal of the SP-100 program is to develop 10 to 1000 kWe electric space reactor power systems for use in United States civil and military space missions in the mid 1990s and beyond. To accomplish this goal, three Federal agencies (NASA, DOD and DOE) established the SP-100 Program in February 1983 as a three-phase effort. The three phases are as follows. Phase I: Mission Requirements and Technology Assessment This will define future civilian and military mission power requirements and assess space reactor power system feasibility of meeting the mission requirements, then select the space reactor power system concept that can satisfy the mission requirements with the least safety, technical, schedule and cost risk. Phase II: Technology Flight Readiness This will provide the technical data base and the verified analytical design codes for building 10 to 1000 kWe space reactor power systems by performing designs, analyses and experiments to validate the Phase I selected space reactor power systems concept. Phase III: Flight System Development and Qualification This is to develop and qualify a flight reactor power subsystem for use on a specific civilian or military space mission in the power range 10 to 1000 kWe, using the data base and analytical design codes developed in Phase II. The SP-100 Phase I activities, which started in February 1983 and were successfully completed in September 1985, fully supported the program transition to Phase II. The SP-100 Phase II program was started in fiscal year 1986 and comprises the following four activities: (1) SP-100 civil missions analysis and requirements definition; (2) advanced aerospace technology; (3) SP-100 missions analysis and requirements definition; and (4) SP-100 ground engineering system development. The fourth activity is technically managed by the SP-100 GES project office, which is a joint Jet Propulsion Laboratory/Los Alamos National Laboratory project reporting to the DOE-NE, SP-100 GES program office at DOE headquarters in Germantown, MD, USA. A comprehensive space reactor power system (SRPS) development program includes analyses and tests at all stages of development from technology demonstration to flight qualification. The SP-100 ground engineering system (GES) project will develop the lithium-cooled uranium nitride reactor and the silicon germanium (gallium
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