NRC Proposes Technology-Inclusive Regulatory Framework for Fusion Machines

The U.S. Nuclear Regulatory Commission published a Federal Register proposed rule titled "Regulatory Framework for Fusion Machines" on 26 February 2026 that would create a technology-inclusive, risk-informed and performance-based regulatory pathway for fusion systems and would clarify oversight of fusion-generated radioactive material. The notice proposes regulatory changes tied to byproduct material regulation and, in some source descriptions, lists targeted amendments to 10 CFR Parts 20, 30, 37, 50, 51, 72, 110, 150, 170 and 171. Reginfo characterizes the action as a limited-scope rulemaking under RIN 3150-AL00 and docket NRC-2023-0071 focused on augmenting byproduct material rules to address near-term fusion systems.

NRC internal materials and the proposed text frame the approach as optional and flexible. The NRC document states: "The NRC proposes to establish an optional technology-inclusive regulatory framework for use by applicants for new commercial advanced nuclear reactors." The same NRC overview adds that "the regulatory requirements developed in this rulemaking would use methods of evaluation, including risk-informed and performance-based methods, that are flexible and practicable for application to a variety of advanced reactor technologies." The package also describes a "self-contained licensing framework featuring a probabilistic risk assessment (PRA)-led approach that aligns with the U.S. Department of Energy cost-shared, industry-led Licensing Modernization Project (LMP) methodology."

Media reporting and Reginfo emphasize the materials angle. Powermag reported the NRC has proposed "the first dedicated federal licensing framework for commercial fusion machines" and that the proposal "seeks to place regulatory oversight of fusion‑generated radioactive material within NRC’s existing materials program." Powermag further states the proposed rule "would revise the NRC’s existing byproduct material regulations in 10 CFR Part 30 ... to explicitly include fusion machines that possess, use, or produce radioactive material" and would clarify licensing for tritium, activation products, and other fusion byproducts. Reginfo explicitly lists scope items: providing fusion-related definitions, developing content requirements for licensing applications, and determining other appropriate requirements.

The rulewriting builds on an extended stakeholder and agency process that began after the Nuclear Energy Innovation and Modernization Act (NEIMA) passed in 2019. NRC staff submitted SECY-23-0021 to the Commission on March 1, 2023, recommending 10 CFR Part 53 for a risk-informed, technology-inclusive framework. The Commission issued SRM-SECY-23-0021 on March 4, 2024 with partial approval and clarifications. Draft Part 53 appeared in the Federal Register in October 2024 (89 FR 86918, docket NRC-2019-0062, RIN 3150-AK31). Reginfo and the Federal Register record show public outreach stretching back to Federal Register notices on Nov. 6, 2020 (85 FR 71002) and Dec. 10, 2021 (86 FR 70423), with stakeholder engagement closing in August 2022 and a Nuclear Innovation Alliance "Stakeholder Consensus on Proposed Part 53 Major Topics" dated Feb. 24, 2025.

Reginfo frames the fusion rule as responding to NEIMA direction "to establish a regulatory framework for fusion systems by 2027," and the Federal Register summary states the NRC "plans to hold a public meeting to promote full understanding of the proposed rule and facilitate public comments." Nuclear Innovation Alliance urged the NRC to incorporate stakeholder recommendations, writing in part: "The successful deployment of advanced nuclear technologies depends on a regulatory framework that is risk-informed, performance-based, and technology-inclusive. While Part 53 represents an important step toward modernizing reactor licensing, our engagement with diverse stakeholders has highlighted areas where improvements are necessary to ensure clarity, efficiency, and effectiveness of implementation. The NRC should incorporate these recommendations to align Part 53 with NEIMA’s intent, reduce unnecessary regulatory burdens, and provide a clear pathway for innovative nuclear technologies."

The next procedural moves are a public meeting and the formal comment period tied to the Feb. 26, 2026 Federal Register notice; the record also points to RIN 3150-AL00 and docket NRC-2023-0071 for the fusion-specific filing and RIN 3150-AK31 and docket NRC-2019-0062 for the broader Part 53 effort. If finalized, the proposal would place tritium, activation products, and other fusion byproducts squarely under clarified NRC materials oversight and offer applicants an optional, PRA-led licensing route aligned with DOE LMP methodology.