In late July of this year, BWX Technologies activated a new production line at its Lynchburg, Virginia facility, capable of producing uranium nitride TRISO fuel. This is a next-generation nuclear fuel designed for what are known as Generation IV nuclear reactors. The action marks a significant milestone in the U.S. Department of Energy’s (DoE) Advanced Reactor Demonstration Program (ARDP), which is intended to help bring high-temperature gas microreactors online by 2026.
What’s at stake here is a potential reshaping of the country’s nuclear future. TRISO is short for tri-structural isotropic. It consists of tiny uranium particles encapsulated in concentric layers of carbon and silicon carbide. These layers can contain radioactive fission products even at temperatures that would destroy conventional nuclear fuels.
Kate Kelly is the president of BWXT Advanced Technologies. She said, “We’re proud to be working with DoE to diversify and optimize our TRISO fuel manufacturing capabilities.” Her team believes that this new technology could help bring small modular reactors (SMRs) and microreactors into wider use, especially in locations where large nuclear plants aren’t practical.
This latest development hinges on additive manufacturing, also known as 3D printing. This technology allows engineers to increase the density of TRISO particles inside each fuel pellet. This makes the reactors more fuel-efficient, potentially reducing operating costs and waste production. A chemical vapor infiltration furnace installed in Lynchburg was the final component needed to launch full-scale TRISO production.
According to the DoE, this advancement could reduce costs for the broader microreactor industry. It’s a step that indicates growing U.S. interest in regaining leadership in nuclear energy. China, Russia, and France have moved faster in the development of new reactors in recent years.
However, the U.S. isn’t moving ahead blindly. BWXT is working with Idaho National Laboratory and Oak Ridge National Laboratory to test and certify the new uranium nitride-based TRISO fuel. These tests are intended to validate performance under extreme conditions and ensure the material meets safety standards before commercial deployment.
Not everyone in the nuclear industry is convinced this rapid push to deploy the next generation of reactors is wise. A July 29 article from Enviro2B, a French environmental news outlet, painted a darker picture. A recent headline read “The U.S. is playing with nuclear fire.” The article cited global concerns over safety, proliferation, and transparency. The news outlet questions whether efforts to fast-track TRISO-based reactors will sideline necessary oversight or risk stoking geopolitical tensions.
France, which also has a stake in developing Generation IV nuclear technology, has expressed concern in recent months about enforcing global safety standards. Environmental advocacy groups have shared those concerns, warning that a new nuclear arms race could emerge under the cover of energy innovation.
At the core of this debate is how the U.S. plans to manage long-term spent nuclear fuel waste, non-proliferation of nuclear weapons, and international coordination as these new reactors go into operation. Critics argue that pushing ahead with the implementation of Gen IV reactors without broad consensus could lead to serious unintended consequences, both diplomatically and environmentally.