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https://en.wikipedia.org/wiki/Kilopower
"The testing of KRUSTY represents the first time the United States has conducted ground tests on any space reactor since the SNAP-10A experimental reactor was tested and eventually flown in 1965.[2]
During November 2017 through March 2018, testing of KRUSTY was conducted at Nevada National Security Site. The tests included thermal, materials, and component validation, and culminated in a successful fission trial at full-power. Various faults in the supporting equipment were simulated to ensure the reactor could respond safely.[3]
The KRUSTY reactor was run at full power on March 20, 2018"
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