DOE and NRC advance Aalo and Oklo reactor approvals
DOE cleared Aalo’s safety basis for Aalo-X while NRC approved Oklo’s Aurora design criteria, putting two advanced-reactor tracks on parallel rails.
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Two U.S. pilot-reactor tracks cleared major gates on the same day, and the split tells you a lot about where advanced-reactor licensing is finally getting traction. DOE’s Idaho Operations Office approved Aalo Atomics’ Documented Safety Analysis for Aalo-X, the safety basis DOE treats as the hard gate before startup, while the NRC approved Oklo’s Principal Design Criteria topical report for Aurora Powerhouse.
For Aalo, the win matters because the project is on the DOE side of the fence, not the NRC side. Aalo-X is an experimental reactor at Idaho National Laboratory near the Materials and Fuels Complex, and the DOE approval moved it into Operational Readiness Review, the last pre-operations phase before a test reactor can move toward criticality. DOE’s pilot program was built to accelerate advanced-reactor testing outside the national laboratories, and DOE set a target of at least three test reactors reaching criticality by July 4, 2026.
Oklo’s milestone sits in a different lane. The NRC says Aurora Powerhouse is a liquid-metal-cooled, metal-fueled fast reactor with a maximum power level of 75 MWe, and the approved PDC topical report is meant to support future licensing applications. The report leans on decades of DOE fast-reactor experience, especially EBR-II and FFTF, giving Aurora a more established technical and regulatory foundation than it had when NRC denied Oklo’s earlier Aurora combined license application without prejudice in January 2022.
Put side by side, the comparison is straightforward. Aalo’s regulator is DOE Idaho Operations Office, its reactor class is an experimental test reactor on DOE land, its site strategy is a buildout at INL near MFC, and its next hurdle is Operational Readiness Review. Oklo’s regulator is the NRC, its reactor class is a 75 MWe fast reactor powerhouse, its strategy is a pre-application licensing basis that can be carried into future filings, and its next hurdle is a formal NRC application that can cite the now-approved PDC. That makes Aalo look closer to steel in the ground, at least on the DOE side, because it has already cleared the DSA gate and moved into readiness review, while Oklo is still building the licensing scaffold for Aurora.
That is the real takeaway from this round of approvals. Advanced reactors are no longer waiting on a single regulatory path to move forward, and the U.S. buildout is beginning to show two live tracks at once, one proving technology in a DOE-authorized test environment and the other tightening a repeatable NRC basis for future deployment.
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