Shares of NANO Nuclear Energy Inc. (NNE) advanced 4.2% in premarket trading Wednesday following the U.S. Nuclear Regulatory Commission’s formal acceptance of a Construction Permit Application for the KRONOS MMR™ microreactor system.
The NRC’s acceptance marks the start of a formal process of safety, environmental and technical evaluation for the microreactor planned for deployment at the University of Illinois Urbana-Champaign. The university, identified as NANO Nuclear’s project partner, originally submitted the application on March 31, 2026.
According to NANO Nuclear, the acceptance signals that the submission contains the necessary information for the NRC to begin a detailed review. Company statements highlight that the KRONOS MMR™ is the first commercially-ready microreactor to achieve this stage within the NRC’s formal licensing process.
Based on the expected scope of work, NANO Nuclear projects that the NRC’s formal review will conclude in 2027. If that timeline holds, the company says it could commence nuclear construction activities at the University of Illinois in the second half of 2027.
Florent Heidet, Chief Technical Officer of NANO Nuclear Energy, said the acceptance "confirms that the NRC has determined the submission contains the information necessary to begin detailed technical evaluation." Heidet added that advancing to this stage "reflects years of engineering, regulatory engagement, and disciplined execution, as well as the substantial work required to support formal review of an advanced reactor design."
The KRONOS MMR™ is described by the company as a proprietary, stationary high-temperature gas-cooled microreactor. NANO Nuclear positions the system as an energy solution for a range of uses, listing potential applications such as:
- Data centers
- Industrial facilities
- Remote communities
- Mining projects
- Military bases
The NRC’s acceptance does not constitute approval of the construction permit. Rather, it authorizes the agency to begin a full technical and environmental assessment of the submitted material. NANO Nuclear’s public estimate for a 2027 review completion outlines a potential path to start of construction in the latter half of that year, contingent on the NRC’s final determinations and any further procedural steps the agency may require.
Sectors impacted: energy production, industrial facilities, data center operators, mining, remote community infrastructure, defense-related facilities, and equity markets tracking NANO Nuclear.