Nuclear power plants for settlements on the Moon and Mars

The first nuclear power plant being considered for production of electricity for manned or unmanned bases on the Moon, Mars and other planets "may really look like it came from outer space."



James E. Werner, the project leader at the U.S. Department of Energy (DOE), said that innovative fission technology for surface power applications is far different from the familiar terrestrial nuclear power stations, which sprawl over huge tracts of land and have cooling towers and other large structures.

An artistâ??s concept of a fission surface power system on the surface of the Moon. Credit: Galaxy Wire

A fission reactor itself is about 1.5 feet wide by 2.5 feet high, roughly the size of a carry-on suitcase, according to Werner. And there are no cooling towers.


Nuclear fission power in space is actually old news. In 1965, the U.S. launched SNAP-10A, which was a 45 kWt thermal nuclear fission reactor that produced 650 watts using a thermoelectric converter. (It operated for 43 days before it was shut down due to a satellite malfunction--but remains in orbit today.)

Nuclear fission works by splitting uranium atoms to generate heat that is then converted into electric power. A fission power system contains components that are similar to those found in the commercial reactors currently in use: a heat source, power conversion, heat rejection and power conditioning and distribution. For space applications, however, nuclear fission features a number of differences compared with commercial reactors.


Sunlight and fuel cells were traditionally the mainstays for generating electricity for space missions, but engineers realized that solar energy has limitations. Solar cells do a great job supplying electricity in near-Earth orbits and for satellite-borne equipment, but nuclear power offers some unique capabilities that could support manned outposts on other planets or moons.

Werner explains:

The biggest difference between solar and nuclear reactors is that nuclear reactors can produce power in any environment. Fission power technology doesn't rely on sunlight, making it able to produce large, steady amounts of power at night or in harsh environments like those found on the Moon or Mars. A fission power system on the Moon could generate 40 kilowatts or more of electric power, approximately the same amount of energy needed to power eight houses on Earth.  Nuclear power has the ability to provide a power-rich environment to the astronauts or science packages anywhere in our solar system and that this technology is mature, affordable and safe to use.



The project is a collaboration between NASA and DOE.

Source:  American Chemical Society


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