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NASA and General Atomics test nuclear fuel for future moon and Mars missions
The first humans to Mars might someday ride a rocket propelled by a nuclear reactor to their destination. But before that can happen, nuclear thermal propulsion (NTP) technologies still have quite a way to go before we could blast astronauts through space on a nuclear rocket.
However, earlier this month, General Atomics Electromagnetic Systems (GA-EMS), in collaboration with NASA, achieved an important milestone on the road to using NTP rockets. At NASA's Marshall Space Flight Center in Alabama, General Atomics tested a new NTP reactor fuel to find out if the fuel could function in the extreme conditions of space.
According to company leadership, the tests showed that the fuel can withstand the harsh conditions of spaceflight. "We're very encouraged by the positive test results proving the fuel can survive these operational conditions, moving us closer to realizing the potential of safe, reliable nuclear thermal propulsion for cislunar and deep space missions," General Atomics president Scott Forney said in a statement.
To test the fuel, General Atomics took the samples and subjected them to six thermal cycles that used hot hydrogen to rapidly increase the temperature to 2600 degrees Kelvin or 4,220 degrees Fahrenheit. Any nuclear thermal propulsion fuel aboard a spacecraft would have to be able to survive extreme temperatures and exposure to hot hydrogen gas.
To test how the fuel could with stand these conditions, General Atomics conducted additional tests with varying protective features to get further data on how different material enhancements improved the performance of the fuel under conditions similar to that of a nuclear reactor. According to the company, these types of tests were a first.
"To the best of our knowledge, we are the first company to use the compact fuel element environmental test (CFEET) facility at NASA MSFC to successfully test and demonstrate the survivability of fuel after thermal cycling in hydrogen representative temperatures and ramp rates," Christina Back, vice president of General Atomics Nuclear Technologies and Materials, said in the same statement.