TimelineJun 5, 2026actionUS-backed microreactor reaches criticality in major nuclear step[1][2][3]1Interesting EngineeringJun 5, 20262POWER MagazineJun 5, 20263East Idaho NewsJun 5, 2026Key score 0.46iNovelty 0.42i7 sources, 7 outletsAll 7 sources