The Nuclear Regulatory Commission (NRC) recently issued a new licensing pathway intended to accelerate safe, innovative reactor deployment while reinforcing U.S. energy leadership.
The “Part 53” licensing framework establishes a “risk informed, technology inclusive licensing framework to enable new nuclear to safely move faster from concept to construction,” intended to modernize how the U.S. regulates next generation reactors.
The rule introduces flexible, performance based safety standards and graded security requirements that are intended to reflect the diversity of emerging reactor designs, rather than what the NRC views as light water reactor assumptions embedded in legacy regulations.
Part 53 is intended to streamline the licensing process by reducing duplicative reviews, enabling staged applications, and providing clearer, more predictable pathways for applicants.
Under the new framework, developers of non light water reactors will no longer need to seek exemptions from requirements tailored to traditional reactor technologies. This is an issue that has complicated the licensing process for innovative reactor designs. Per the NRC, these changes could significantly reduce the time and cost required to bring new reactors online, which it says would support broader national goals to expand clean energy deployment and strengthen U.S. leadership in nuclear innovation.
The NRC emphasized that Part 53 builds on years of research and stakeholder engagement, which includes public meetings and comments on the proposed rule issued in October 2024. The NRC directed its staff to finalize the rule and the accompanying guidance documents, nine of which are being released immediately, with additional guidance forthcoming.
Part 53 will take effect 30 days after publication in the Federal Register. The NRC added that this is the beginning of a broader regulatory reform effort under Executive Order 14300 and the ADVANCE Act (Pub. L. 118–67), which will introduce additional rulemakings in the coming months.
