Antares Nuclear announced on October 27, 2026 a multi-year agreement under which BWX Technologies' BWXT Advanced Fuels will manufacture TRISO fuel for Antares microreactors through the end of the decade. The agreement sets terms for an initial allocation of 1 metric ton of uranium, with provisions to increase quantities as deployment requirements evolve.
Built on a line that has already delivered
Fuel will be made at BWXT's Lynchburg, Virginia facility, on the same fabrication line that supplied Antares' Mark-0 reactor and Department of Energy programs. That continuity matters: TRISO qualification is slow and expensive, and reusing an established line shortens the path from contract to delivered compacts.
Antares' reactors use HALEU containing less than 20 percent uranium-235, fabricated into TRISO compacts — uranium-bearing kernels surrounded by successive layers of carbon and ceramic materials including silicon carbide, designed to retain fission products under high temperature and irradiation.
A second supplier for redundancy
The BWXT deal is Antares' second TRISO fabrication agreement. In August 2026, the company signed a binding supply agreement with Standard Nuclear covering a minimum of 1 MTU and up to 8 MTU in total, with deliveries extending through 2035. Standard Nuclear, which is expanding its TRISO manufacturing operations, said the agreement would support Antares microreactors for defense and space applications.
Two suppliers for one reactor family is a deliberate fuel-security strategy — one that mirrors how large utilities structure conversion and enrichment contracts to avoid single points of failure.
Upstream: Centrus and prepayments
In September 2026, Antares and Centrus Energy announced a definitive multi-year HALEU supply contract, with deliveries expected to begin before the end of the decade. The agreement includes prepayments from Antares to support Centrus' expansion of domestic enrichment capacity at its American Centrifuge Plant in Piketon, Ohio, where the company is pursuing commercial-scale production of HALEU and conventional LEU. The companies said the arrangement could provide US-origin, unobligated material.
The wider fabrication signal
Antares' twin TRISO deals land alongside other US fabrication milestones, including BWX Technologies' delivery of a complete TRISO core for the Project Pele microreactor in late 2025. With fuel fabrication forecast to post the highest growth rate in the HALEU value chain, supplier agreements signed today are effectively capacity reservations for the 2030s.
This article was assisted by AI analysis. Please refer to the original source for official information.