X-Energy's TX1 Plant: Oak Ridge's Nuclear Fuel Revival

TX1 — Oak Ridge’s Novel Nuclear Fuel Factory

For the first time in fifty years, America is poised to produce a new kind of nuclear fuel. In Oak Ridge, Tennessee, X-Energy is completing a plant called TX1. The facility is dedicated to manufacturing triso fuel, a type of nuclear fuel packaged into tiny, durable particles. These particles, each no bigger than a poppy seed, are wrapped in layers of carbon and silicon carbide, acting as individual pressure vessels, stable even at temperatures exceeding 1,450 degrees Celsius. The plant feeds into the Xe-100 reactor.

Stretching America's Clean Energy Future

TX1 is more than just a new plant; it's a step toward energy independence. Unlike traditional nuclear fuels, triso fuel uses high-assay low-enriched uranium (HALEU), which, until now, had only one commercial supplier: Russia. By producing its own HALEU, America can diversify its energy sources and reduce reliance on foreign suppliers. Moreover, TX1 represents a shift in how nuclear energy is perceived. The facility is designed to produce 700,000 fuel pebbles annually, each containing roughly 18,000 uranium kernels. These pebbles will power X-Energy's Xe-100 reactors, which generate 80 megawatts of electricity each. Critically, these reactors are cooled by helium and can be refueled without shutting down. This continuous operation enhances their efficiency and reduces downtime. Furthermore, the plant's 215,000 square-foot footprint and 40-year license, granted in February 2026, underscore its significance in America's energy landscape.

The Broken Chessboard of Triso Fuel

Boldly, X-Energy is adding a new piece to the energy chessboard with triso fuel. Each sphere, about the size of a billiard ball, contains around 18,000 tiny uranium kernels. The design's genius lies in its stability and safety: every kernel is a minuscule pressure vessel, resilient up to 1,450 degrees Celsius. This makes triso fuel exceptionally stable, reducing the risk of meltdowns. Moreover, each reactor can run for 240 days before needing refuel. The ability to refuel while the reactor is in operation adds to its efficiency.

Cooled by Helium, Refueled on the Fly

Helium, a noble gas, is the coolant of choice for the Xe-100 reactors. Unlike water, helium doesn't interact chemically with the fuel, ensuring a safer and more efficient cooling process. But the real innovation lies in the reactors' ability to be refueled without shutting down. This continuous operation significantly cuts downtime and boosts the reactor's overall efficiency.

Fuel for the Future

A facility the size of a football field, TX1 sprawls 215,000 square feet. It is designed to produce 700,000 pebbles annually. That's enough to supply eleven Xe-100 reactors. With a 40-year license granted in February 2026 and a vertical construction phase complete, the plant is set to begin fuel production in early 2028. This significant step will ensure a steady supply of triso fuel, a key component in advancing America's nuclear energy capabilities.

Regulatory Green Light

The Nuclear Regulatory Commission's 40-year license, granted in February 2026, marks a milestone. It confirms the TX1 plant's safety and efficiency, paving the way for its operation over the next four decades. With this regulatory approval, X-Energy can focus on the next phase: equipment installation and fuel production.

Page Two of the Energy Story

TX1 represents more than just technological advancement; it’s a strategic move in the energy sector's evolving narrative. The plant exemplifies America's push for energy independence, environmental sustainability, and technological innovation. For those invested in sustainable energy solutions, following the progress of TX1 and the Xe-100 reactors will be a crucial part of understanding the future of nuclear energy.