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SPEAR Using a Fission Reactor and Advanced Thermoelectrics
This will subsequently require a reduction in operating temperatures and reduce the total power levels achievable by the core. However, the reduced mass will require reduced power for propulsion, resulting in a small, inexpensive nuclear electric spacecraft.
They want to use it to bring ten CubeSats to Europa.
They think they can get the thermoelectric generators to about 25% efficiency.
If the advanced thermoelectric generators work then there would be a lot of earth-based applications.