TLDR
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Oklo stock rebounds after DOE clears final safety basis for Groves reactor.
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DOE approval moves Oklo’s Texas isotope reactor closer to startup.
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OKLO rises pre-market as Groves advances toward July criticality.
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Groves enters final DOE review after Oklo secures key safety approval.
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Oklo targets July criticality as Texas reactor clears major DOE step.
Oklo (OKLO) stock regained ground in pre-market trading after the company secured a key federal safety approval for its Texas reactor. OKLO rose to $54.90, up 4.92%, after closing at $52.33, down 0.82%. The move followed progress on Groves, an isotope test reactor now nearing final startup review.
DOE Approval Moves Groves Toward Startup
Oklo said the U.S. Department of Energy approved the Documented Safety Analysis for Groves Isotope Test Reactor. The approval came under DOE’s Reactor Pilot Program, which supports selected advanced reactor projects. As a result, Groves moved beyond its main safety documentation stage.
The Documented Safety Analysis sets the final safety basis for the facility. It reviews potential hazards, safety controls, and operating rules needed before startup. It also follows DOE approval of the preliminary safety analysis used during design and construction.
With both approvals secured, Groves now enters DOE’s final pre-startup process. The remaining steps include a readiness review and startup approval from the department. After that approval, Oklo can receive fuel, load it, and begin startup testing.
Texas Reactor Advances Toward July Criticality
Oklo targets first criticality at Groves in July 2026. Criticality marks the point where a reactor achieves a controlled, self-sustaining nuclear chain reaction. The next review steps will determine the project’s path toward that milestone.
The company broke ground on the site less than a year ago. It now presents Groves as a commercial-style test facility built outside a national laboratory. The project uses privately owned land, commercial fuel sources, and private-sector systems under DOE oversight.
Groves also supports Oklo’s wider isotope business. The reactor aims to help produce critical isotopes used in cancer care, manufacturing, research, space work, and security. Many of these isotopes still come from overseas suppliers or older production sites.
Oklo Builds Domestic Isotope Supply Chain
Oklo expects Groves to test production processes before wider commercial output. The pilot facility also helps the company assess reactor performance and operating procedures. In turn, the work could support a stronger domestic isotope supply chain.
The company develops fast fission power plants, nuclear fuel recycling, and isotope production systems. It also received a DOE site use permit for a commercial advanced fission plant. Oklo received fuel from Idaho National Laboratory for earlier development work.
Oklo has positioned Groves as a test case for faster advanced nuclear deployment. The project remains subject to DOE oversight before fuel loading and criticality. However, the latest approval gives the company a clear next step before startup.
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