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2026-02071.pdf - Department of Energy Categorical Eclusion for Advanced Nuclear Reactors
2026-02071.pdf
[6450-01-P]
DEPARTMENT OF ENERGY
[DOE-HQ-2025-0405]
Categorical Exclusion for Advanced Nuclear Reactors
AGENCY: Department of Energy.
ACTION: Notice of new categorical exclusion and request for comment.
SUMMARY: The U.S. Department of Energy (DOE or the Department) is establishing a
categorical exclusion for authorization, siting, construction, operation, reauthorization, and
decommissioning of advanced nuclear reactors for inclusion in its National Environmental
Policy Act (NEPA) implementing procedures. DOE is including the categorical exclusion in the
component of its NEPA implementing procedures that it maintains outside of the Code of
Federal Regulations. The new categorical exclusion is based on the experience of DOE and other
Federal agencies, current technologies, regulatory requirements, and accepted industry practice.
DATES: This new categorical exclusion is effective on [INSERT DATE OF PUBLICATION
IN THE FEDERAL REGISTER]. Comments on the new categorical exclusion are due by
[INSERT DATE 30 DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL
REGISTER].
ADDRESSES: This notice and the written record for this categorical exclusion are available on
the DOE NEPA website at www.energy.gov/nepa. Also, documents relevant to this notice,
including this notice and the written record, are posted on the Federal eRulemaking Portal at
www.regulations.gov (Docket: DOE-HQ-2025-0405).
Submit comments, labeled “DOE categorical exclusion for advanced nuclear reactors,”
using the Federal eRulemaking Portal: www.regulations.gov.
Instructions: All submissions must include the agency name, “Department of Energy,”
and docket number, DOE-HQ-2025-0405, for this notice. All comments received will be posted
without change to www.regulations.gov, including any personal information provided. Do not
This document is scheduled to be published in the
Federal Register on 02/02/2026 and available online at
https://federalregister.gov/d/2026-02071, and on https://govinfo.gov
submit any information you consider to be private, Confidential Business Information (CBI), or
other information whose disclosure is restricted by statute.
Docket: For access to the docket to read comments received, go to www.regulations.gov.
FOR FURTHER INFORMATION CONTACT: For questions concerning this notice, contact
Ms. Carrie Abravanel, Acting Director, Office of NEPA Policy and Compliance, at
askNEPA@hq.doe.gov or (202) 586-4600.
SUPPLEMENTARY INFORMATION:
Table of Contents
I. Introduction
II. Categorical Exclusion
III. Support
IV. DOE Solicits Comment
V. Approval of the Office of the Secretary
I. Introduction
Executive Order (E.O.) 14301, Reforming Nuclear Reactor Testing at the Department of
Energy (May 23, 2025), Section 6 Streamlining Environmental Reviews, directs the Secretary of
Energy to create “categorical exclusions as appropriate for reactors within certain parameters.”
E.O. 14301 states, “[d]ecades of research and engineering have produced prototypes of advanced
nuclear technologies that incorporate passive safety mechanisms, improve the physical
architecture of reactor designs, increase reactor operational flexibility and performance, and
reduce risk in fuel disposal. Advanced reactors—including microreactors, small modular
reactors, and Generation IV and Generation III+ reactors—have revolutionary potential.”
Further, E.O. 14299, Deploying Advanced Nuclear Reactor Technologies for National Security
(May 23, 2025), directs the Secretaries of Defense and Energy to consult with the Chairman of
the Council on Environmental Quality regarding “applying the Department of Defense’s and the
Department of Energy’s established categorical exclusions under the National Environmental
Policy Act (NEPA), 42 U.S.C. 4321 et seq., for the construction of advanced nuclear reactor
technologies on certain Federal sites within the United States and for any other appropriate
measures for the purposes of implementing this order” and “establishing new categorical
exclusions for the same purposes,” among other things. E.O. 14299 states that “[a]dvanced
nuclear reactors include nuclear energy systems like Generation III+ reactors, small modular
reactors, microreactors, and stationary and mobile reactors that have the potential to deliver
resilient, secure, and reliable power to critical defense facilities and other mission capability
resources.”
NEPA establishes three types of environmental review for proposed major Federal
actions that are not otherwise excused from the obligation to undergo NEPA review, see 42
U.S.C. 4336: environmental impact statement, environmental assessment, and categorical
exclusion—each involving different levels of information and analysis. An environmental impact
statement is a detailed analysis of reasonably foreseeable environmental effects prepared for a
major Federal action significantly affecting the quality of the human environment (42 U.S.C.
4336(e)(6); 42 U.S.C. 4332). An environmental assessment is a concise public document
prepared by a Federal agency to set forth the basis for its finding of no significant impact or its
determination that an environmental impact statement is necessary (42 U.S.C. 4336(e)(4); 42
U.S.C. 4336(b)(2)). A categorical exclusion is a category of actions that the agency has
determined, as established in its agency NEPA procedures, normally does not significantly affect
the quality of the human environment and therefore does not require preparation of an
environmental assessment or environmental impact statement (42 U.S.C. 4336e(1)).
In preparing this categorical exclusion, DOE developed supporting technical information
briefly summarized in section III of this notice and consulted with the Council on Environmental
Quality, the Department of War (formerly the Department of Defense), and the Nuclear
Regulatory Commission.
DOE consulted with the Department of War on this categorical exclusion in alignment
with E.O. 14299, Deploying Advanced Nuclear Reactor Technologies for National Security
(May 23, 2025) with respect to a potential future siting, construction, and operation of advanced
nuclear reactor technologies on Department of War installations to accelerate deployment of
resilient power solutions in support of mission assurance objectives for critical infrastructure,
and ensure military readiness.
DOE consulted with the Nuclear Regulatory Commission for establishing this categorical
exclusion and to help the Nuclear Regulatory Commission understand DOE’s approach for
considering extraordinary circumstances when applying this categorical exclusion as well as a
discussion of how DOE’s integral elements for all categorical exclusions listed in 10 CFR part
1021 and DOE’s NEPA implementing procedures outside the CFR, appendix B, condition
application of this categorical exclusion.1
In deciding whether to apply this categorical exclusion to a particular project, DOE
would consider each of the conditions in the categorical exclusion itself, the integral elements
listed in appendix B of DOE’s NEPA implementing procedures, and other conditions contained
in DOE’s NEPA implementing procedures, including whether extraordinary circumstances exist
such that a normally excluded action may have a significant environmental effect.
As mentioned previously, DOE’s NEPA implementing procedures include “integral
elements” that apply to all categorical exclusions listed in appendix B to DOE’s NEPA
implementing procedures. 10 CFR part 1021 and DOE’s NEPA implementing procedures
outside the CFR, appendix B, paragraphs (1) through (5).2 Although the integral elements are not
repeated for each categorical exclusion, they are part of the definition of each categorical
exclusion listed in appendix B, and DOE must consider them as part of its determination of
whether the proposed action fits within a categorical exclusion (10 CFR 1021.102(b)(1) and
Section 5.4(c)(1) of DOE’s NEPA implementing procedures). Integral elements require that, to
fit within a categorical exclusion, the proposed action must not threaten a violation of applicable
1 DOE’s NEPA implementing procedures outside the CFR are available at:
https://www.energy.gov/nepa/articles/doe-nepa-implementing-procedures-june-2025.
2 See 10 CFR part 1021, appendix B, and DOE’s NEPA implementing procedures, appendix B:
www.ecfr.gov/current/title-10/chapter-X/part-1021 and https://www.energy.gov/nepa/articles/doe-nepa-
implementing-procedures-june-2025.
environment, safety, and health requirements; require siting and construction or major expansion
of waste storage, disposal, recovery, or treatment facilities; disturb hazardous substances,
pollutants, or contaminants that preexist in the environment such that there would be
uncontrolled or unpermitted releases; have the potential to cause significant impacts on
environmentally sensitive resources; or involve genetically engineered organisms, synthetic
biology, governmentally designated noxious weeds, or invasive species, unless certain conditions
are met.3 DOE defines “environmentally sensitive resource” as a resource that has typically been
identified as needing protection through Executive order, statute, or regulation by Federal, state,
or local government, or a federally recognized Indian tribe. Environmentally sensitive resources
include historic properties, threatened and endangered species or their habitat, floodplains, and
wetlands, among others (appendix B of 10 CFR part 1021 and DOE’s NEPA implementing
procedures).
In determining whether a proposed action fits within a categorical exclusion, DOE may
review information provided by an applicant, in its application and during follow-up requests;
information from systems maintained by DOE, another Federal agency, or external party (e.g.,
geographic information systems); information from site visits; information from discussions or
consultations with Federal, state, local, or tribal governments; and information from other
sources as needed. During this review, DOE can determine that additional information is needed
to decide whether to make a categorical exclusion determination or decide to prepare an
environmental assessment or environmental impact statement. Only if DOE determines that all
the applicable requirements and conditions of the categorical exclusion (including the integral
elements, as applicable) have been met will it proceed to review the proposed action for
extraordinary circumstances, and potentially proceed to issue a categorical exclusion
determination, thus completing NEPA review, or to prepare an environmental assessment or
3 This is a summary description of the integral elements. See 10 CFR part 1021, appendix B, and DOE’s NEPA
implementing procedures, appendix B, for the full text: www.ecfr.gov/current/title-10/chapter-X/part-1021 and
https://www.energy.gov/nepa/articles/doe-nepa-implementing-procedures-june-2025.
environmental impact statement. DOE regularly posts its categorical exclusion determinations at
www.energy.gov/nepa/doe-categorical-exclusion-cx-determinations.
II. Categorical Exclusion
DOE is adding the following new categorical exclusion to appendix B of the DOE NEPA
implementing procedures, which is published outside the Code of Federal Regulations and
available at www.energy.gov/nepa:
B5.26 Advanced nuclear reactors
Authorization, siting, construction, operation, reauthorization, and decommissioning of advanced
nuclear reactors, provided DOE determines that:
(1) the project’s attributes, including potential fission product inventory, fuel type, reactor
design, and operational plans, reduce sufficiently the risk of adverse offsite consequences
from the release of radioactive or hazardous materials, and
(2) the project demonstrates that any hazardous waste, radioactive waste, or spent nuclear
fuel generated by the project can be managed in accordance with applicable requirements.
For the purposes of this category, a project may include multiple reactors within a nuclear
facility.
III. Support
DOE’s full written record to explain the basis for the new categorical exclusion,
including a discussion of relevant NEPA reviews, is available at www.energy.gov/nepa.
In summary, advanced nuclear reactors have key attributes such as safety features, fuel
type, and fission product inventory that limit adverse consequences from releases of radioactive
or hazardous material from construction, operation, and decommissioning. Although past
advanced reactor projects have been for solely experimental, testing and demonstration purposes,
the advanced fuel forms, inherently safe designs, and inventories of potential fission products
associated with these reactors indicate that reactors in this category developed for additional
purposes, such as power production and industrial applications, are also appropriate for this
categorical exclusion.
Advanced reactor projects in this category typically employ inherent safety features and
passive safety systems, in addition to well-established fuel, coolant, and structural materials that
support their associated DOE safety design basis. Performance of these fuels, systems, and
materials is sufficient to provide reasonable assurance of adequate protection to the public,
workers, and environment. New reactor designs and their associated fuels ensure containment of
radionuclides in the event of an accident. Operational periods for these projects will be bounded
by the potential fission product inventory and will vary depending on the design and fuel type.
Previously completed NEPA reviews have established that advanced reactors, including
construction, operation, and decommissioning, characterized by technologies and materials (1)
that have been verified to prevent adverse offsite consequences from release of radioactive or
hazardous materials and (2) demonstrate that any hazardous waste, radioactive waste, or spent
nuclear fuel generated by the project can be managed in accordance with applicable requirements
do not significantly affect the quality of the human environment.
IV. DOE Solicits Comment
As explained previously, DOE is adding the new categorical exclusion for advanced
nuclear reactors to its NEPA implementing procedures published outside the Code of Federal
Regulations. DOE previously received public comments requesting that DOE add a categorical
exclusion for nuclear power reactors (e.g., 84 FR 34074). DOE has elected voluntarily to solicit
comments on its new categorical exclusion for advanced nuclear reactors. DOE is soliciting
comment on this new categorical exclusion and the associated written record, and may make
revisions to this categorical exclusion, if DOE’s review of any comments submitted suggests that
further revisions are warranted. Commenters have 30 days from the date of publication of this
notice to submit comments.4
Signing Authority
This document of the Department of Energy was signed on January 28, 2026, by Chris
Wright, Secretary of Energy, U.S. Department of Energy. That document with the original
signature and date is maintained by DOE. For administrative purposes only, and in compliance
with requirements of the Office of the Federal Register, the undersigned DOE Federal Register
Liaison Officer has been authorized to sign and submit the document in electronic format for
publication, as an official document of the Department of Energy. This administrative process in
no way alters the legal effect of this document upon publication in the Federal Register.
Signed in Washington, DC, on January 29, 2026.
Jennifer Hartzell,
Alternate Federal Register Liaison Officer,
U.S. Department of Energy.
[FR Doc. 2026-02071 Filed: 1/30/2026 8:45 am; Publication Date: 2/2/2026]
4 Before February 2025, the executive branch’s historical practice was to receive public comments before
promulgating a categorical exclusion. This practice was established by CEQ’s NEPA implementing regulations. See
43 FR 56003 through 56004 (November 29, 1978) (establishing 40 CFR 1508.4, which defined, in part, a
categorical exclusion as “procedures adopted by a Federal agency in implementation of these regulations” and cross-
cited 40 CFR 1507.3 which required those procedures to be “publish[ed] . . . in the Federal Register for comment
and . . . adopted only after an opportunity for public review”); see also 89 FR 35573-35575 (May 1, 2024)
(analogous provisions in the 2024 final rule revising CEQ’s NEPA implementing regulations). This historical
practice is no longer applicable to the executive branch given that CEQ’s NEPA implementing regulations have
been rescinded in their entirety. See 90 FR 10610 (February 25, 2025); see also 90 FR 8353 (January 29, 2025)
Executive Order 14154 (Unleashing American Energy), section 5(c) (directing revision of agency NEPA
implementing procedures to “[c]onsistent with applicable law, . . . prioritize efficiency” over all other policy
objectives).
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