A Second Qualified Fuel Source
Microreactor developer Antares has signed a multi-year commercial agreement with BWX Technologies to procure TRISO fuel fabricated from high-assay low-enriched uranium for its microreactors through the end of the decade. The deal gives Antares two qualified sources for reactor fuel, following its earlier TRISO fabrication agreement with Standard Nuclear.
The initial commitment is an allocation of one metric ton of uranium (1 MTU), with the ability to increase as Antares' deployment schedule requires. Later quantities, schedules and technical requirements will be set through a series of future task orders.
Built on a Government-Funded Line
The fuel will be produced at BWXT's Lynchburg, Virginia facility, on the same TRISO fabrication line used for the Department of War's Project Pele and for Antares' own Mark-0 and Mark-1 reactors. That shared lineage matters commercially: the line has already produced fuel for a government demonstration program and for Antares' criticality campaign, reducing the qualification risk that normally accompanies a new reactor-fuel pairing.
Antares achieved criticality with BWXT fuel, and BWXT fuel is slated to power Antares' electricity-producing Mark-1 reactor in 2027.
Deployment Timeline Tightens the Fuel Question
Antares was founded in 2023 and has raised more than $600 million. It achieved initial criticality of its Mark-0 microreactor in 2026 under the DOE Reactor Pilot Program and targets initial production deployments to U.S. military installations beginning in 2028.
That schedule explains the emphasis on securing fabrication capacity now rather than at first order. TRISO fabrication from HALEU is one of the narrowest chokepoints in the advanced reactor supply chain: the number of qualified production lines in the United States is small, and each carries government-derived process qualification that cannot be replicated quickly.
Why One Metric Ton Is Not the Point
A one-metric-ton uranium allocation is small in absolute terms — a fraction of what a single large light-water reactor reload requires. For a microreactor program, however, it represents several reactors' worth of initial cores and, more importantly, a reservation of line time. In a market where HALEU supply remains limited and where advanced reactors and SMRs are forecast to be the fastest-growing enrichment end-use segment, the ability to convert HALEU into certified TRISO on a schedule is what separates a paper deployment plan from a fueled reactor.
This article was assisted by AI analysis. Please refer to the original source for official information.