A First for Advanced Reactor Fuel
In a landmark regulatory decision in February 2026, the Nuclear Regulatory Commission (NRC) issued its first-ever license for an advanced reactor fuel manufacturing facility. The license was granted to TRISO-X, a facility located in Oak Ridge, Tennessee. This historic approval authorizes the commercial manufacturing of TRISO (Tristructural Isotropic) fuel, a critical component for high-temperature gas-cooled reactors and other next-generation nuclear designs, paving the way for domestic fuel fabrication.
Capacity and Operational Scope
The newly granted license is substantial in both scope and duration, carrying a 40-year operational term. Under this authorization, the TRISO-X facility is permitted to produce approximately 5 tons of uranium annually. In practical terms, this output translates to the manufacturing of roughly 700,000 TRISO fuel pebbles each year. This massive production capacity is designed to meet the anticipated fuel demands of the upcoming fleet of commercial advanced reactors being developed across the United States.
Construction and Industry Momentum
The regulatory green light follows significant physical progress at the site. X-energy, the driving force behind the TRISO fuel technology, commenced vertical construction of the Oak Ridge facility in November 2025. The transition from construction to licensed commercial manufacturing represents a major de-risking of the advanced reactor supply chain. By securing a domestic source for TRISO fuel, developers can now confidently plan for fuel loading and long-term operational strategies without relying on foreign supply chains.
TRISO fuel's unique ability to withstand extreme temperatures makes it the preferred choice for many small modular reactors (SMRs) and microreactors. The NRC's approval not only validates the safety and quality of X-energy's manufacturing processes but also signals a broader regulatory readiness to support the commercialization of advanced nuclear technologies.
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