Nano Nuclear Energy Inc. (NASDAQ: NNE) filed a Construction Permit Application (CPA) with the U.S. Nuclear Regulatory Commission (NRC) for its KRONOS MMR microreactor, marking a critical regulatory milestone for the company.
The application was submitted by the Grainger College of Engineering at the University of Illinois Urbana‑Champaign, Nano Nuclear’s partner on the project. The CPA moves the KRONOS MMR from engineering design into the NRC’s formal licensing review, with an estimated 12‑month review period. The reactor is a 15 MWe high‑temperature gas‑cooled microreactor designed to deliver carbon‑free power to a range of applications.
Nano Nuclear is the first commercially‑ready microreactor developer to submit a CPA and the third Generation IV advanced reactor developer to reach this stage. The KRONOS MMR technology was acquired from Ultra Safe Nuclear Corporation in January 2025 for $85 million, providing patents, contracts, and collaborations that accelerated the development timeline.
"Submitting the Construction Permit Application to the NRC is a defining moment for NANO Nuclear. This milestone represents years of engineering, regulatory engagement, and disciplined execution. It is where advanced nuclear projects begin to separate into those that are ready for execution and those still requiring significant R&D efforts," said Florent Heidet, Chief Technical Officer. "We are now firmly on the path toward constructing, demonstrating, and ultimately deploying our reactor technology at scale. This is not just a step forward for NANO Nuclear – it is a step toward making advanced nuclear a commercial reality," he added. Founder and Chairman Jay Yu noted, "We are pleased to take this significant step toward the construction and operation of the first KRONOS MMR™ modular microreactor in the United States in partnership with the University of Illinois Urbana‑Champaign." Dean Rashid Bashir of the Grainger College of Engineering remarked, "The Grainger College of Engineering is excited to work with NANO Nuclear to see this project delivered. Executing on this project is a major step for our college and we look forward to the next steps."
Analysts view the CPA submission as a significant de‑risking event, indicating design maturity and progress into the NRC licensing process. The NRC is actively streamlining licensing for advanced reactors under proposed 10 CFR Part 53, and the estimated 12‑month review period is a key factor in Nano Nuclear’s timeline. While the company remains pre‑revenue and loss‑making, the milestone reduces regulatory risk and positions it for potential construction, demonstration, and eventual commercialization of the KRONOS MMR.
The CPA submission positions Nano Nuclear to move from design to construction, demonstration, and eventual deployment of the KRONOS MMR, potentially delivering 15 MWe of carbon‑free power to data centers, industrial sites, and remote communities.
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