🎉 WE HAVE CRITICALITY! 🎉
On June 4, 2026, at around 12:30 MDT,
@AntaresNuclear’s Mark-0 microreactor achieved initial criticality at
@INL.
It is the first nuclear test reactor to go critical under
@ENERGY’s Reactor Pilot Program. Congratulations to Antares on reaching this historic milestone!