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News
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LCG, November 6, 2025--X-energy Reactor Company, LLC, (X-energy) and the U.S. Office of Nuclear Energy today announced the start of confirmatory irradiation testing at Idaho National Laboratory (INL) to qualify X-energy’s proprietary TRISO-X fuel pebbles for commercial use in the Xe-100 Small Modular Reactor (SMR). (TRISO stands for TRi-structural ISOtropic). This is the first time that TRISO-X fuel pebbles will undergo irradiation testing in a U.S. lab, which is a critical step in meeting requirements set forth by the U.S. Nuclear Regulatory Commission (NRC) for the commercial deployment of advanced reactors that will use the fuel.
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LCG, October 28, 2025--NextEra Energy and Google yesterday announced two agreements that will help meet growing electricity demand from artificial intelligence (AI) with clean, reliable, 24/7 nuclear power and strengthen the nation's nuclear leadership. First, Google signed a new, 25-year agreement for power generated at the Duane Arnold Energy Center, Iowa's only nuclear power facility. The 601-MW boiling water reactor unit was shut down in 2020 and is expected to commence operations by the first quarter of 2029, pending regulatory approvals to restart the plant.
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Industry News
X-energy Commences First Irradiation Tests of Advanced TRISO-X Nuclear Fuel at Idaho National Laboratory
LCG, November 6, 2025--X-energy Reactor Company, LLC, (X-energy) and the U.S. Office of Nuclear Energy today announced the start of confirmatory irradiation testing at Idaho National Laboratory (INL) to qualify X-energy’s proprietary TRISO-X fuel pebbles for commercial use in the Xe-100 Small Modular Reactor (SMR). (TRISO stands for TRi-structural ISOtropic). This is the first time that TRISO-X fuel pebbles will undergo irradiation testing in a U.S. lab, which is a critical step in meeting requirements set forth by the U.S. Nuclear Regulatory Commission (NRC) for the commercial deployment of advanced reactors that will use the fuel.
For X-energy, the testing is part of X-energy's larger efforts to establish the country’s first commercial advanced nuclear fuel fabrication facility to support the deployment of their SMR design, the Xe-100. X-energy’s initial SMR deployment is planned to provide power and process heat to Dow’s UCC Seadrift Operations Center on the Texas Gulf Coast. The nuclear project, the Long Mott Generating Station project, will include four Xe-100 SMRs, which are high-temperature, gas-cooled SMRs powered by TRISO particle fuel. X-energy's SMR can produce 80 MW of electric output or 200 MW of process heat and is designed to operate for 60 years. Four reactors are planned at the Long Mott Generating Station to replace aging steam and power assets that are approaching end-of-life. The project is part of a demonstration project supported by the U.S. Department of Energy (DOE) and, if approved, would be the first advanced nuclear facility at an industrial site in the United States.
X-energy, the DOE and National Reactor Innovation Center (NRIC) will collaborate in a 13-month testing program to evaluate fuel performance across virtually all foreseeable operating scenarios. TRISO-X is the first commercially-produced SMR fuel to undergo testing of this rigor, marking a significant milestone in the X-energy’s efforts to support national energy security through the establishment of a secure, domestic supply of high-quality advanced nuclear fuel.
The X-energy Pebble Reactor Test (XPeRT) allows the DOE to independently evaluate how TRISO-X fuel performs under various power levels, temperatures, and burnup conditions relevant to the Xe-100 SMR design. While largely confirmatory in nature, the testing will gather primary performance data to fulfill key requirements by the NRC for all advanced reactor designs seeking commercial deployment, plus milestones established under the Advanced Reactor Demonstration Program.
The testing will occur at INL’s Advanced Test Reactor (ATR), the largest and most powerful research reactor in the world, and a critical proving ground for nuclear fuels historically. Follow-on post-irradiation examination at INL and Oak Ridge National Laboratory will measure the fuel’s fission-product retention and structural stability under the full range of expected commercial operating conditions.
"What began in Oak Ridge as a pioneering effort to advance TRISO manufacturing is now leading the way in qualifying the fuel that will power the next generation of reactors," said the CEO of X-energy. "TRISO-X embodies decades of U.S. innovation in fuel design, and this testing program brings us one step closer to our goal of redefining the standard for safety and reliability in nuclear energy."
X-energy's TX-1 fuel fabrication facility is currently under construction in Oak Ridge, Tennessee, and is poised to become the first NRC-licensed Category II nuclear fuel fabrication facility licensed in over fifty years.
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