SMRTR Science & EngineeringAug 6, 2026Interesting Engineering

US nuclear startup achieves first reactor criticality in under one year at Texas site

SMRTR summary

Oklo reached a major milestone by achieving first criticality at its Groves Isotope Test Reactor in Texas, less than a year after breaking ground. Built on private land under a DOE program that allows faster approvals, the reactor will support domestic isotope production for medicine, research, and national security, setting a new benchmark for advanced nuclear deployment.

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