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8h ago

DOE Clears Oklo’s Groves Test Reactor to Load Fuel and Begin Startup Tests

The authorization opens U.S. testing for domestic isotope production and signals that a privately financed, repeatable reactor deployment model can advance under the Reactor Pilot Program.

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US allows Oklo to load nuclear fuel, proceed toward first criticality.
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Overview

  • The U.S. Department of Energy completed a readiness review and granted startup authorization that lets Oklo load fuel, run startup tests, and move the Groves Isotope Test Reactor toward first criticality under the Reactor Pilot Program.
  • Groves is a low‑power test reactor built to prove U.S. domestic production of medical, research, industrial, space, and national‑security isotopes rather than to generate electricity.
  • Oklo financed and built Groves on private land using commercial suppliers and in‑house systems, and the company developed its own safety, quality and operating programs to meet DOE readiness standards.
  • Immediate next steps include fuel receipt and loading, hands‑on startup testing and progress to first criticality, while larger commercial projects like the Aurora design still face separate NRC licensing, HALEU fuel supply, and financing hurdles.
  • The authorization produced a modest positive market reaction and could shorten future project timelines by supplying operational experience and repeatable procedures that affect workers, customers for isotopes, and Oklo’s commercial pitch to data centers and government buyers.