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Categorical Exclusion (CE)

U.S. Department of Energy

Agency-published source DOE NEPA Procedures, App. B, B5.26 (opens in new tab)

Categorical Exclusion

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.

Category B5: Conservation, Fossil, and Renewable Energy Activities.

CE source references

Application conditions

The classes of actions listed below include the following conditions as integral elements of the classes of actions. To fit within the classes of actions listed below, a proposal must be one that would not:
(1) Threaten a violation of applicable statutory, regulatory, or permit requirements for environment, safety, and health, or similar requirements of DOE or Executive Orders;
(2) Require siting and construction or major expansion of waste storage, disposal, recovery, or treatment facilities (including incinerators), but the proposal may include categorically excluded waste storage, disposal, recovery, or treatment actions or facilities;
(3) Disturb hazardous substances, pollutants, contaminants, or CERCLA-excluded petroleum and natural gas products that preexist in the environment such that there would be uncontrolled or unpermitted releases;
(4) Have the potential to cause significant impacts on environmentally sensitive resources. An environmentally sensitive resource is typically a resource that has been identified as needing protection through Executive Order, statute, or regulation by Federal, state, or local government, or a Federally recognized Indian tribe. An action may be categorically excluded if, although sensitive resources are present, the action would not have the potential to cause significant impacts on those resources (such as construction of a building with its foundation well above a sole-source aquifer or upland surface soil removal on a site that has wetlands). Environmentally sensitive resources include, but are not limited to: (i) Property (such as sites, buildings, structures, and objects) of historic, archeological, or architectural significance designated by a Federal, state, or local government, Federally recognized Indian tribe, or Native Hawaiian organization, or property determined to be eligible for listing on the National Register of Historic Places; (ii) Federally-listed threatened or endangered species or their habitat (including critical habitat) or Federally-proposed or candidate species or their habitat (Endangered Species Act); state-listed or state-proposed endangered or threatened species or their habitat; Federally-protected marine mammals and Essential Fish Habitat (Marine Mammal Protection Act; Magnuson-Stevens Fishery Conservation and Management Act); and otherwise Federally-protected species (such as the Bald and Golden Eagle Protection Act or the Migratory Bird Treaty Act); (iii) Floodplains and wetlands (as defined in 10 CFR 1022.4, “Compliance with Floodplain and Wetland Environmental Review Requirements: Definitions,” or its successor); (iv) Areas having a special designation such as Federally- and state-designated wilderness areas, national parks, national monuments, national natural landmarks, wild and scenic rivers, state and Federal wildlife refuges, scenic areas (such as National Scenic and Historic Trails or National Scenic Areas), and marine sanctuaries; (v) Prime or unique farmland, or other farmland of statewide or local importance, as defined at 7 CFR 658.2(a), “Farmland Protection Policy Act: Definitions,” or its successor; (vi) Special sources of water (such as sole-source aquifers, wellhead protection areas, and other water sources that are vital in a region); and (vii) Tundra, coral reefs, or rain forests; or
(5) Involve genetically engineered organisms, synthetic biology, governmentally designated noxious weeds, or invasive species, unless the proposed activity would be contained or confined in a manner designed and operated to prevent unauthorized release into the environment and conducted in accordance with applicable requirements, such as those of the Department of Agriculture, the Environmental Protection Agency, and the National Institutes of Health.

Application procedures

(a) Proposed recurring activities to be undertaken during a specified time period, such as routine maintenance activities for a year, may be addressed in a single categorical exclusion determination after considering the potential aggregated impacts.

(c) To find that a proposal is categorically excluded, DOE shall affirmatively determine the factors listed below. When applying more than one categorical exclusion to a proposal, DOE shall consider these factors for the full scope of the proposal and the collective scope of the categorical exclusions.
(1) The proposal fits within one or more classes of actions listed in appendices B–C of these procedures;
(2) The proposal has not been segmented to meet the definition of a categorical exclusion. Segmentation can occur when a proposal is broken down into small parts in order to avoid the appearance of significance of the total action. However, segmentation does not include proposals that are developed and potentially implemented over multiple phases where each phase results in a decision whether to proceed to the subsequent phase.

Documentation requirements

(d) DOE will document its determination that one or more categorical exclusions applies to a proposed agency action for any application of a categorical exclusion included in appendices B or C of these procedures.

(e) Categorical exclusion determinations for actions listed in appendix B shall be documented and made available to the public by posting online, generally within two weeks of the determination, unless additional time is needed in order to review and protect classified information, “confidential business information,” or other information that DOE would not disclose pursuant to the Freedom of Information Act (FOIA) (5 U.S.C. 552). Posted categorical exclusion determinations shall not disclose classified information, “confidential business information,” or other information that DOE would not disclose pursuant to FOIA. (See also section 4.1)

Extraordinary circumstances

(3) There are no extraordinary circumstances related to the proposal that indicate a normally excluded agency action is likely to have a reasonably foreseeable significant adverse effect. It is not the presence of an extraordinary circumstance that precludes application of a categorical exclusion, but rather application of a categorical exclusion is not possible only when DOE concludes that the extraordinary circumstance is likely to cause a reasonably foreseeable significant adverse effect or that DOE does not know the environmental effect of the extraordinary circumstance. DOE or an applicant may modify the proposal to avoid reasonably foreseeable adverse significant effects such that the categorical exclusion would apply. Extraordinary circumstances are unique situations presented by specific proposals, including, but not limited to, uncertain effects or effects involving unique or unknown risks.

Classification

Energy & Electric Power — tags: conservation-fossil-and-renewable-energy-activities, nuclear, hazardous-materials, leasing, telecommunications, construction

Provenance

  • Agency: U.S. Department of Energy (DOE)
  • Dataset: U.S. Department of Energy
  • Source provenance: Agency-published source
  • Source type: agency hosted
  • Identifier: 8fedbe7d-f4b1-5a79-be67-7026eaf0151d
  • Identity status: provisional (publisher declaration, not independently verified)
  • Source release: 2026-07
  • Source last updated: 2026-07-13
  • Source current as of: 2026-08-12
  • Fetched at: 1970-01-01T00:00:00+00:00 (not an agency verification date)
  • Catalog scope: agency — DOE NEPA Implementing Procedures; publisher declares complete: true

Source legal reference

DOE NEPA Implementing Procedures

Disclaimer

This CE Explorer tool is not an authoritative source and creates no rights or obligations. Review the relevant agency's NEPA procedures before applying a categorical exclusion.

When using the CE Explorer Tool, Federal agencies and stakeholders should review the relevant agency's NEPA procedures for information about how to apply the CE, including any limitations or potential extraordinary circumstances, and to ensure that a CE is current and applicable to a given proposed action. To adopt and use another agency's categorical exclusion, an agency must follow the steps described in section 109 of NEPA, 42 U.S.C. 4336c.

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