NRC Wants to Make Building Reactors Less Painful
Published Date: 7/16/2026
Proposed Rule
Summary
The Nuclear Regulatory Commission is updating the rules for how nuclear reactors get licensed, checked for safety, and where they can be built. These changes will make the process faster and clearer, helping new clean energy get on the grid sooner. If you want to share your thoughts, you have until August 31, 2026, to comment—this could also save money by cutting red tape!
Analyzed Economic Effects
11 provisions identified: 9 benefits, 0 costs, 2 mixed.
Estimated Net Savings to NRC and Industry
The NRC's draft regulatory analysis estimates undiscounted total net savings of $1.86 billion to the NRC and industry from the proposed rule. Using discount rates, the analysis reports $802.10 million in net savings at 7 percent and $1.26 billion at 3 percent.
Faster Preconstruction for Reactor Parts
The NRC would narrow the meaning of "construction" so only structures, systems, and components (SSCs) whose construction can affect their safety function need prior NRC approval. The rule would also add general-license provisions (e.g., new paragraphs in proposed 10 CFR 50.10(h) and 53.1130(e)) to allow some beginning-of-construction activities when an application is docketed, which the NRC says can reduce the cost impact of the current construction definition.
Determinate Safety Thresholds Added
The NRC proposes adding the terms "design basis event" (DBE) and "beyond design basis event" (BDBE) and publishing draft guidance (DG-1454) that sets determinate, data-backed thresholds and graded assessment approaches for categorizing events. The guidance would also clarify how to select design-basis controlling parameters used as reference bounds in SSC design.
Risk-Informed Changes and Modeling Flexibility
The NRC would allow quantitative risk results to show a change is not a "more than minimal increase" under 10 CFR 50.59, and would let licensees make some method changes if they adopt a verification, validation, and uncertainty quantification (VVUQ) program under a proposed new 10 CFR 50.221. This enables more licensee-led evaluations and use of advanced modeling methods.
Lower Decommissioning Estimates Allowed
Applicants for certain new reactors and licensees could submit a design-specific decommissioning cost estimate that is less than the minimum table amounts in 10 CFR 50.75(c). Part 53 would get similar changes so site-specific certification amounts can reflect design-specific estimates for new technologies.
Longer Reactor Operating Renewals
The NRC proposes to extend the duration of renewed operating licenses, allow applicants to propose alternative risk-informed and performance-based criteria, and remove several prescriptive application and post-approval recordkeeping requirements to facilitate operational extensions for the current nuclear fleet.
Flexible Reactor Siting Criteria
The NRC would revise 10 CFR part 100 to create a two-tier siting approach (adding Tier 1 and Tier 2 definitions) and allow siting in higher population density areas when justified by an assessment comparing societal risks and societal benefits. The agency would keep a long-standing preference for low population density sites but provide flexibility with implementing guidance.
Higher Uranium Enrichment Limits
The NRC proposes rules to license conventional and accident-tolerant light-water reactor fuels enriched to greater than 5.0 weight percent uranium-235 and to address related issues such as fuel fragmentation, relocation, and dispersal. The aim is to enable efficient licensing of fuels with increased enrichment while providing reasonable assurance of public health and safety.
Broader Alternatives to Codes and Standards
The NRC would let licensees request a broader scope of voluntary alternatives under 10 CFR 50.55a(z) to more of the codes and standards in 10 CFR 50.55a, instead of being limited to paragraphs (b) through (h). The rule keeps the existing criteria for approving alternatives (acceptable level of quality and safety, and hardship without a compensating increase in quality or safety).
Optional Streamlined Quality Assurance
The NRC would add a proposed appendix T to 10 CFR part 50 offering an optional, voluntary, performance-based alternative to appendix B quality-assurance criteria for applicants who meet certain conditions. Appendix T emphasizes a graded approach and terminology from other industries and could reduce NRC oversight of some suppliers and vendors when appropriate.
Longer Manufacturing License Duration
The NRC would change the duration of a manufacturing license (ML) and the duration of a renewed ML to 40 years (proposed changes to 10 CFR 52.173 and 52.181). The change is intended to align ML durations with certified designs and improve efficiency for building new reactors.
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Key Dates
Department and Agencies
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