Lightbridge Corporation announced today, 10 October 2025, that it has completed the loading of capsules containing enriched uranium‑zirconium alloy samples into an experiment assembly for irradiation testing in the Advanced Test Reactor (ATR). The capsules were manufactured at Idaho National Laboratory (INL) and are now ready for insertion into the ATR, marking a key operational milestone in the company’s fuel development roadmap.
The announcement was made by Lightbridge’s Vice President of Engineering, Dr. Scott Holcombe, and INL’s Associate Laboratory Director for Nuclear Science & Technology, Jess Gehin. Both leaders highlighted the importance of the step, noting that the experiment assembly is now prepared for irradiation testing, which is essential for gathering data required for regulatory approval and eventual commercialization of Lightbridge Fuel. The collaboration underscores the partnership between Lightbridge and INL in advancing the technology.
Completing the capsule loading brings Lightbridge closer to obtaining the rigorous irradiation testing data that regulators will require before the fuel can be licensed for commercial use. The milestone demonstrates progress toward the company’s goal of demonstrating Lightbridge Fuel in a test reactor environment and ultimately achieving regulatory approval. It also signals momentum in the company’s development timeline, reinforcing investor confidence in the feasibility of the technology.
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