Event Brief
UPDATED Jun 7, 2026 at 4:16 PM ET
Jun 4, 2026 at 7:04 PM ET
Small modular reactor reaches criticality in first test
By The BriefBrief
Antares' small modular nuclear reactor reached criticality in its first test, though it is not yet ready to generate power.
WHO: Antares
WHAT: A small modular nuclear reactor reached criticality in its first test
WHEN: Jun 5, 2026 at 3:23 PM ET
WHERE: Location not specified
WHY: Cause not yet established.
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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