NNE: NRC Finalizes Part 53, Proposes Part 57 for Advanced Reactors
NANO Nuclear Energy Inc. announced that the U.S. Nuclear Regulatory Commission (NRC) has finalized its Part 53 rule, effective April 29, 2026, establishing a new optional licensing framework for advanced reactors. Additionally, the NRC issued a proposed Part 57 rule, specifically tailored for microreactors like NNE's KRONOS MMR™, aiming for streamlined and scalable deployment. NANO Nuclear is evaluating both frameworks, believing they could provide significant benefits for future commercial deployments of its advanced microreactor technologies, though its initial KRONOS MMR™ project will proceed under the existing Part 50 framework. The company supports the NRC's efforts to modernize the regulatory environment to enable innovation in advanced nuclear technologies.
Key Highlights
- NRC finalized Part 53 rule, effective April 29, 2026, creating a risk-informed, performance-based licensing framework.
- Part 53 offers an alternative pathway for advanced reactor designs like NNE's KRONOS MMR™.
- NRC proposed Part 57 rule, specifically for microreactors, aiming for streamlined and repeatable deployment.
- Proposed Part 57 includes combined licensing, factory fabrication recognition, and reduced emergency planning.
- NNE is evaluating both rules for applicability to future commercial deployments of its KRONOS MMR™.
- NNE's initial KRONOS MMR™ deployment will proceed under existing Part 50 research reactor framework.
- NNE supports NRC's efforts to modernize regulatory framework and is engaging with industry stakeholders.
- Management believes these frameworks will support efficient, scalable commercialization of microreactors.
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