List of nuclear power systems in space
This list of nuclear power systems in space includes nuclear power systems that were flown to space, or at least launched in an attempt to reach space. Such used nuclear power systems include:
Systems never launched are not included here, see Nuclear power in space.
Initial total power is provided as either electrical power or thermal power, depending on the intended application.
| Nation | Mission | Launched | Status | Location | Notes | Type | System name | Nuclear fuel | Power | Ref |
 United Statespartial success|IntactSimpleNuclide|link=yes|plutonium|238val|2.7|u=We |