Modernizing NRC Environmental Review Without Overcorrecting

The National Environmental Policy Act (NEPA) and nuclear regulation have been intertwined for more than half a century. The landmark 1971 Calvert Cliffs decision required environmental review to become an integral part of federal nuclear licensing. Congress and the courts have repeatedly refined NEPA’s scope, most recently through the Fiscal Responsibility Act of 2023, the ADVANCE Act of 2024, and the Supreme Court’s 2025 Seven County decision. 

Today, NEPA remains a procedural statute: it does not establish nuclear safety standards or determine whether a reactor can be licensed, but requires the NRC to consider environmental consequences as part of its decision-making. For years, environmental review at the Nuclear Regulatory Commission (NRC) has been slower and more resource-intensive than environmental protection necessarily requires. New commercial reactors have generally been routed into full Environmental Impact Statements (EIS) based on the licensing action itself, rather than first asking what level of review the project’s expected environmental effects actually warrant. An unnecessary EIS can add years of review and substantial cost, while an Environmental Assessment (EA) or categorical exclusion (CatEx) can identify projects with limited impacts much more efficiently. Generic analysis can eliminate still more repetitive work by resolving environmental issues that do not need to be reconsidered from scratch for every reactor. A faster review does not equal a less robust one. The NRC should spend analytical effort on environmental impacts that actually require it. 

The NRC’s proposed overhaul of Part 51 following Executive Order 14300 is a significant opportunity and a culmination of years of work to modernize environmental regulations. It would address some of the structural problems that have made nuclear NEPA reviews unnecessarily burdensome, including the automatic use of EISs for particular licensing actions. Moving instead toward significance-based review would allow the environmental effects of a project to determine whether an EA or EIS is appropriate. The proposal also expands CatExs and generic analysis, makes greater use of existing information, and creates a pathway for applicant-prepared environmental documents. Those are important steps toward the more proportionate and predictable system Congress has directed the NRC to develop.

But speed alone is not the measure of a successful environmental review system. The final rule also has to preserve meaningful environmental protection and establish a framework that can withstand implementation and legal scrutiny over time. Some of the NRC’s proposed changes risk going beyond eliminating unnecessary procedure and instead narrowing the environmental effects the agency considers under NEPA. Most significantly, the proposal would exclude some non-radiological impacts of a nuclear project—such as effects on air, water, ecosystems, or land use—because another agency has primary responsibility for regulating them. This draws the boundary in the wrong place. The NRC does not need to duplicate another regulator’s work or assume authority Congress has given elsewhere, but it should still account for reasonably foreseeable environmental effects caused by the project it is licensing. Where another agency has greater expertise or regulatory responsibility, the NRC should rely on that agency’s analysis and coordinate the review rather than simply exclude the effect.

The same balance is necessary elsewhere in the rule. The alternatives analysis should no longer require routine comparisons between a nuclear project and unrelated gas, wind, solar, or other generation projects outside the NRC’s licensing authority, but it should preserve consideration of reasonable nuclear alternatives when they could meaningfully inform the decision. Expanded categorical exclusions and generic findings should rest on clear technical boundaries rather than simply assuming that unresolved site-specific impacts are insignificant. Applicant-prepared environmental documents should replace duplicative work while leaving the NRC responsible for independent review and final findings. And accelerated schedules should still provide a meaningful opportunity for the public to review a developed environmental analysis before the agency’s decision is final.

The central task in modernizing Part 51 is designing a system capable of both timely and comprehensive environmental reviews: moving quickly when experience and evidence show that impacts are limited or already well understood, focusing greater scrutiny on projects and effects that warrant it, and maintaining the clear analytical boundaries and administrative record needed to make those efficiencies durable. Environmental review remains an important safeguard; it does not need to be slow or duplicative to be rigorous.