Antares Achieves Criticality of Mark-0 Reactor

Antares has become the first private company to achieve criticality of its Mark-0 microreactor at Idaho National Laboratory under the DOE Reactor Pilot Program, marking the first American non-light water privately developed reactor to reach criticality in over four decades. The achievement, conducted in partnership with the Department of Energy, INL, BWX Technologies, and the U.S. Army, establishes a replicable licensing pathway to accelerate future advanced reactor demonstrations and supports the Army's goal of deploying electricity-producing microreactors to military installations by 2028.