Space 1999 (or perhaps 2020...)

''The goal of the Fission Surface Power Project, which is based at NASA's Glenn Research Center in Cleveland, Ohio, is to produce a non-nuclear prototype unit within five years.
...
Prometheus was preceded in the 1950s and 60s by the NERVA, Project Orion and other initiatives.

Prometheus ended, but a small-scale effort to develop a compact, highly autonomous fission reactor as part of the agency's new exploration initiative, Project Constellation, survived. The program aims to return U.S. astronauts to the moon by 2020 and establish a base before moving on to manned missions to Mars and other bodies in the solar system. ''

Source here.