The U.S. Nuclear Regulatory Commission is providing public notice of receipt and availability of a construction permit application from the University of Illinois Urbana-Champaign for a single-unit research reactor designated the U. of I. KRONOS™ Micro Modular Reactor. The application, filed March 27, 2026 pursuant to Section 104c. of the Atomic Energy Act of 1954 and 10 CFR Part 50, proposes a high-temperature gas-cooled design utilizing solid tri-structural isotropic fuel to be located on the UI campus in Champaign, Illinois. The NRC staff is currently conducting its acceptance review; if accepted for docketing, subsequent Federal Register notices will address public participation provisions.