Event Brief
UPDATED Jun 7, 2026 at 4:16 PM ET
Jun 4, 2026 at 7:04 PM ET
Antares microreactor reaches criticality at Idaho Lab
By The BriefBrief
Antares Nuclear’s Mark-0 microreactor achieved criticality at Idaho National Laboratory under a DOE program.
WHO: Antares Nuclear
WHAT: Antares Nuclear’s Mark-0 microreactor reached reactor criticality
WHEN: Jun 7, 2026 at 4:06 PM ET
WHERE: Idaho National Laboratory
WHY: It achieved criticality under the Trump DOE program.
How this story developed (showing 4 of 4 earlier reports)
Reporting from 5 identified publishers across this event arc.
View all 5 publishers
Publishers represented across this event arc
These publishers contributed reporting to the broader event history. Not every source addresses the specific development described above.
How this brief is built: The BriefBrief correlates multiple sources into one evolving event brief, updated as new facts emerge.
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