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NRC renews AP1000 nuclear reactor design certification

NRC renews AP1000 nuclear reactor design certification

Rule Changes

Direct final rule extends certification 40 years, updates design to Vogtle as-built configuration

Today: NRC publishes direct final rule renewing AP1000 certification

Overview

Updated 51 minutes ago

The U.S. Nuclear Regulatory Commission renewed the design certification for Westinghouse's AP1000 reactor on October 14, 2026. The direct final rule extends the certification for 40 years and incorporates Revision 20 of the design control document, which reflects the as-built configuration of the two AP1000 units at Vogtle Electric Generating Plant in Georgia.

The renewal means future applicants can license the AP1000 against a design validated by real construction, not just paper. The NRC kept Revision 19 in place for existing license holders, so both versions remain referenceable for new applications.

Why it matters

Future U.S. nuclear projects can license the AP1000 against a construction-proven design, cutting review time and regulatory risk for new builds.

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Key Indicators

40 years
New design certification duration
The renewed certification runs 40 years from the December 28, 2026 effective date.
2
Vogtle units validating the design
Units 3 and 4 at Vogtle are the first AP1000 reactors built in the U.S.
Nov 13, 2026
Comment deadline
Significant adverse comments by this date would force withdrawal of the direct final rule.

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Organizations Involved

U.S. Nuclear Regulatory Commission
U.S. Nuclear Regulatory Commission
Federal regulator
Regulator issuing the design certification renewal

Independent federal agency regulating commercial nuclear power plants and other civilian nuclear facilities.
Westinghouse Electric Company
Westinghouse Electric Company
Nuclear technology company
AP1000 design owner and renewal applicant

Nuclear technology company that developed the AP1000 pressurized water reactor design.
Vogtle Electric Generating Plant
Vogtle Electric Generating Plant
Nuclear Power Plant
Construction-validated design basis for DCD Revision 20

Georgia nuclear plant whose Units 3 and 4 are the first AP1000 reactors built in the U.S.

Timeline

December 2005 December 2026

8 events Latest: Today
Tap a bar to jump to that date

  1. Direct final rule takes effect

    Upcoming Regulatory

    AP1000 certification renewed for 40 years from this date.

  2. Comment deadline for direct final rule

    Upcoming Regulatory

    NRC will withdraw rule if significant adverse comments arrive by this date.

  3. NRC publishes direct final rule renewing AP1000 certification

    Today Rule Change

    Rule extends certification 40 years and incorporates DCD Revision 20.

  4. NRC grants Westinghouse renewal timing exemption

    Regulatory

    Exemption allows renewal application more than 36 months before certification expiration.

  5. Westinghouse submits AP1000 renewal request

    Application

    Westinghouse files renewal request with DCD Revision 20 incorporating Vogtle as-built changes.

  6. NRC staff flags upcoming AP1000 renewal application

    Planning

    SECY-26-0034 informs the Commission of the anticipated Westinghouse application.

  7. NRC extends design certification duration to 40 years

    Rule Change

    Regulation change replaces 15-year design certification duration with 40 years.

  8. NRC issues original AP1000 design certification

    Regulatory

    The NRC certified the AP1000, the first Generation III+ reactor design approved in the U.S.

Scenarios

1

Direct final rule takes effect December 28, 2026

Likely Resolves by Dec 28, 2026

Discussed by: NRC, Federal Register

The NRC considers the renewal non-controversial. If no significant adverse comments arrive by November 13, the rule becomes effective December 28, extending the certification 40 years from that date. This is the expected path given the NRC's verification review found no new changes requiring additional technical review.

2

Significant adverse comments force rule withdrawal

Unlikely Resolves by Nov 13, 2026

Discussed by: NRC (direct final rule process)

If the NRC receives significant adverse comments by November 13, it will withdraw the direct final rule and address the comments in a subsequent final rule. This would delay the renewal and could require a second comment period if the revisions are substantially modified.

3

New AP1000 projects reference Revision 20

Possible Resolves by End of 2027

Discussed by: NRC staff (SECY-26-0034)

The renewal aims to streamline future AP1000 licensing by giving applicants an updated, standardized design basis. Utilities and tech companies exploring new nuclear builds could reference Revision 20 in combined license applications, avoiding the need to justify departures from an older design.

Historical Context

3 moments from history that rhyme with this story — and how they unfolded.

December 2005

AP1000 design certification (2005)

The NRC certified the AP1000 design in December 2005, the first Generation III+ reactor design approved in the U.S. The certification was originally valid for 15 years.

Then

The certification enabled utilities to reference the AP1000 design in combined license applications.

Now

The design became the basis for the first new U.S. reactors in decades at Vogtle.

Why this matters now

The 2026 renewal extends this same certification for 40 years and updates it with construction lessons.

July 2025

Design certification duration change (2025)

On July 2, 2025, the NRC amended its regulations to replace the 15-year duration of design certifications with 40 years, for both existing and future certifications.

Then

Existing design certifications, including the AP1000, had their expiration dates extended.

Now

The change gave reactor vendors a longer window to market their designs.

Why this matters now

The 2026 renewal builds on this change, extending the AP1000 certification for 40 years from the rule's effective date.

2013-2024

Vogtle Units 3 and 4 construction

The first AP1000 units built in the U.S. were at Vogtle Electric Generating Plant in Georgia. Construction ran years behind schedule and billions over budget, but both units came online in 2023 and 2024.

Then

The construction revealed design changes that needed to be incorporated into the design control document.

Now

The as-built configuration became the basis for DCD Revision 20.

Why this matters now

Revision 20 reflects the construction-validated design, so future applicants reference a design proven in the field.

Sources

(7)
+1
Federal Register Headwaters Wire Federal Register / GovInfo Nuclear Regulatory Commission American Nuclear Society / Nuclear Newswire World Nuclear News Federal Register