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SP-100
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<p>SP-100 (Space reactor Prototype) was a U.S. research program for <a href="/facts/Nuclear_fission_reactor/8xqjIbge">nuclear fission reactors</a> usable as small <a href="/facts/Fission_power_system/fgMCeMsu">fission power systems</a> for spacecraft. It was started in 1983 by <a href="/facts/NASA/TIMCV0yV">NASA</a>, the <a href="/facts/US_Department_of_Energy/PRp6Cz8g">US Department of Energy</a> and other agencies. </p><p>A reactor was developed with <a href="/facts/Heat_pipes/Fr8GoobY">heat pipes</a> transporting the heat to <a href="/facts/Thermoelectric_generator/ISMDGaUD">thermoelectric generators</a>. It was cooled with <a href="/facts/Lithium/7vXX6BWA">lithium</a>. The project never advanced to flight hardware and was terminated in 1994. </p>