U.S. DOE Delivers Nuclear Power System for NASA’s Perseverance Rover

The U.S. Department of Energy (DOE) successfully delivered its latest nuclear power system to the Kennedy Space Center in Florida for installation on NASA’s Perseverance rover.

The Multi-Mission Radioisotope Thermoelectric Generator (MMRTG) was fueled, built and tested by DOE’s national laboratories to power the Perseverance rover being launched to Mars under NASA’s Mars 2020 mission. The Mars 2020 launch is scheduled later this summer.

Mars 2020 Multi-Mission Radioisotope Thermoelectric Generator (MMRTG
Multi-Mission Radioisotope Thermoelectric Generator (MMRTG) which will power the NASA Mars 2020 mission’s Perseverance rover. DOE Photo.

Perseverance will be the first rover to use plutonium created by Oak Ridge National Laboratory (ORNL). The lab, along with Idaho and Los Alamos national laboratories, is helping NASA beef up its fuel supply for Plutonium-238—an isotope used for deep space missions.

ORNL recently automated part of the production process allowing the lab to produce up to 400 grams of Pu-238 each year, moving closer to NASA’s goal of 1.5 kilograms per year by 2025.

Radioisotope power systems (RPS) convert heat generated by the natural decay of Pu-238 into electrical power. The MMRTG will provide electricity for the basic operations of the Perseverance rover and keep the rover’s tools and systems at optimal temperatures. The power system has an operational lifespan of 14 years which surpasses the energy needs of the rover’s year-long journey to, and exploration of, the red planet.

Rendering of NASA Mars 2020 Rover
Artist’s rendering of NASA Mars 2020 Perseverance rover. (Photo courtesy of NASA/JPL-Caltech)

DOE maintains the essential infrastructure to help fuel, build and test each power system. ORNL provides the heat source materials and hardware for NASA missions. Los Alamos National Laboratory purifies and encapsulates the plutonium-238. Idaho National Laboratory then assembles, tests, and assures the final delivery of the RPS.

The delivery and installation of the MMRTG completes the RPS production phase of this project. A hot fit check was conducted to test the rover’s system while powered by the MMRTG. A small crew from INL will monitor the power system around the clock until its anticipated launch on July 17th, 2020.

DOE will continue to support its strong partnership with NASA. Its next MMRTG is set to power the Dragonfly rotorcraft lander mission to explore Saturn’s largest moon, Titan. Since solar energy is not a viable option in Titan’s hazy atmosphere, the MMRTG will play a major role in supplying power to the spacecraft.

Dragonfly is scheduled to launch in 2026.



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