The ATF-2E experiment is a continuation of the Accident Tolerant Fuels (ATF) irradiation series conducted by Idaho National Laboratory (INL) in the Advanced Test Reactor (ATR) Loop 2A.
Office of NEPA Policy and Compliance
February 23, 2026
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The ATF-2E experiment is a continuation of the Accident Tolerant Fuels (ATF) irradiation series conducted by Idaho National Laboratory (INL) in the Advanced Test Reactor (ATR) Loop 2A. This revision includes activities to support expanded testing of advanced nuclear fuel designs. The experiment involves a four-tier test train configuration with specimens provided by both domestic and international partners, including Westinghouse Electric Company (WEC), General Electric (GE), Framatome, General Atomics (GA), and international collaborators such as Japan Atomic Energy Agency (JAEA), Mitsubishi Heavy Industries (MHI), Hitachi-GE, Global Nuclear Fuel-Japan (GNF-J), and Nippon Nuclear Fuel Development (NFD). The goal is to evaluate fuel performance under reactor conditions to improve the safety and efficiency of nuclear power.