ML22140A021

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10 - Status of SLR in the United States 2022-05-25
ML22140A021
Person / Time
Issue date: 05/25/2022
From: Allen Hiser
NRC/NRR/DNRL
To:
Hiser A, 301-415-5650
Shared Package
ML22143A408 List:
References
Download: ML22140A021 (22)
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Status of Subsequent License Renewal and Related Activities Allen Hiser NRC/Industry Materials Exchange Meeting May 25, 2022

OUTLINE

  • Impact of Commission decision on environmental reviews for SLR
  • Technical challenges in the SLR reviews
  • Consideration of license renewal for 40 years and technical issues for 100 years
  • Planned revision 1 of the GALL-SLR and SRP-SLR

Background References on US Reactor License Renewal

Status of Reactor Licenses in the US

  • 92 operating reactor units in the U.S.
  • Renewed licenses (to operate for 60 years) issued for 94 units (10 have ceased operations)

- 8 units with 40-year licenses (Diablo Canyon will shutdown 2024/2025)

- 78 units with 60-year licenses

- 6 units with 80-year licenses (Turkey Point, Peach Bottom and Surry)

  • 59 units (50 operating) have entered their 41st year of operation; first was in April 2009

- More than 400 reactor-years of operation beyond the initial 40-year licenses NRC/Industry Materials Exchange Meeting - May 25, 2022 4

License Renewal and SLR Applications 4 SLR applications under review

- North Anna Power Station, Units 1 and 2 - received Aug 2020

- Point Beach Nuclear Plant, Units 1 and 2 - received Nov 2020

- Oconee Nuclear Station, Units 1, 2, and 3 - received June 2021

- St. Lucie Nuclear Plant, Units 1 and 2 - received Aug 2021 3 SLR applications scheduled

- Monticello Nuclear Generating Plant, Unit 1 - Jan to Mar 2023

- Browns Ferry Nuclear Plant, Units 1, 2 and 3 - Dec 2023

- Virgil C. Summer Nuclear Station, Units 1, 2, and 3 - Oct to Dec 2023 3 LR applications scheduled

- Comanche Peak Nuclear Power Plant, Units 1 and 2 - Oct to Dec 2022

- Perry Nuclear Power Plant, Unit 1 - July to Sept 2023

- Clinton Power Station, Unit 1 - Jan to Mar 2024 NRC/Industry Materials Exchange Meeting - May 25, 2022 5

- Safety review (aging management, time-limit aging analyses, etc.)

- Environmental review NRC License Renewal Overview 6

NRC/Industry Materials Exchange Meeting - May 25, 2022

Environmental Impact Statement (EIS)

  • Regulations for EIS are in Part 51 to Title 10 of the Federal Code of Regulations - relate to National Environmental Policy Act (NEPA) of 1969
  • Environmental issues are binned:

- Category 1: apply to all or a subset of plants

- Category 2: additional plant-specific review is needed

  • Evaluated in environmental report in the application
  • NRC staff prepares a site-specific Supplemental EIS (SEIS),

e.g., NUREG-1437 Supplement XX 7

NRC/Industry Materials Exchange Meeting - May 25, 2022

Commission Orders On February 24, 2022, the Commission issued three orders (CLI-22-02, CLI-22-03 (for example), and CLI-22-04):

LR GEIS does not apply to SLR; therefore, environmental review is incomplete (regulation states applicable to initial renewal)

Renewed licenses rolled back 20 years Peach Bottom Units 2 and 3 Turkey Point Units 3 and 4 Cannot publish final SEIS documents North Anna Units 1 and 2 Point Beach Units 1 and 2 Cannot publish Draft SEIS documents Oconee Units 1, 2, and 3 St. Lucie Units 1 and 2 8

NRC/Industry Materials Exchange Meeting - May 25, 2022

Response to Commission Direction

  • Staff plans

- Remove the word initial from Part 51

- Update NUREG-1437, Revision 1

- Thorough analysis of the environmental impacts of subsequent license renewal

  • Effect on issuance of subsequent renewed licenses

- Use of LR GEIS would result in a delay of ~2 years

- Applicants can provide a plant-specific assessment of the Category 1 topics that are addressed in the GEIS (NUREG-1437) 9 NRC/Industry Materials Exchange Meeting - May 25, 2022

SLR Technical Issues

- Trends for high fluence levels

- Sufficiency of reactor vessel material surveillance program capsules

  • Reactor vessel internals - high fluence effects

- Irradiation-assisted stress corrosion cracking

- Loss of fracture toughness

- Void swelling

  • Concrete and containment performance

- Long-term radiation and high temperature exposure

- Alkali-silica reaction (ASR)

  • Electrical cables

- Environmental qualification

- In-service testing of cables

- Long-term submersion of low and medium voltage cables NRC/Industry Materials Exchange Meeting - May 25, 2022 10

Technical Challenges from SLR Application Reviews

- Low operational temperatures

- Evaluated for 60 years but not 80 years

  • PWR reactor vessel internal components

- Approved program is for 60 years

- Plant-specific analysis needed, using a gap analysis to address aging differences from 60 to 80 years

  • Buried piping fabricated from gray cast iron material

- Brittle material with cracking due to cyclic loading NRC/Industry Materials Exchange Meeting - May 25, 2022 11

Consideration of 40-Year License Renewal Terms and Plant Operation to 100 Years License Renewal for an Additional 40 years Motivated by a plant with a 40-year license operating near the end of that license Looked at legal/regulatory aspects, environmental review, safety review, and inspection/oversight aspects Public meeting on February 18, 2021 - ADAMS ML21070A117 Industry stated not on their radar right now Public comments generally not supportive Technical Issues for 100 years of Operation Public meeting on January 21, 2021 - ADAMS ML21078A453 Industry stated prudent to continue relevant research Public comments generally not supportive Closure Memo dated June 22, 2021 (ADAMS ML21117A007)

Both of the above activities were discontinued Considered extension of on-going research for 60 years NRC/Industry Materials Exchange Meeting - May 25, 2022 12

GALL Report and SRP-LR Versions

- Revision 0 - issued July 2001

- Revision 1 - issued September 2005

- Revision 2 - issued December 2010

- Interim changes made using License Renewal - Interim Staff Guidance (LR-ISG) process

  • 10 LR-ISGs apply to Revision 2

- Issued July 2017

  • 4 SLR-ISGs apply to SLR documents NRC/Industry Materials Exchange Meeting - May 25, 2022 13

Basis for Development of GALL-SLR

  • To reflect expected aging differences for increased operating time from 60 to 80 years
  • New plant operating experience since GALL Rev. 2
  • Gaps identified in current guidance
  • Improvements in efficiency and effectiveness of applications and NRC reviews
  • Corrections to GALL Rev. 2 and SRP-LR Rev. 2
  • Incorporate Interim Staff Guidance since GALL Rev. 2 NRC/Industry Materials Exchange Meeting - May 25, 2022 14

Revision of GALL-SLR and SRP-SLR

  • 4 SLR-ISGs have been issued

- SLR-ISG-2021-01: Aging Management Criteria for Reactor Vessel Internal Components of Pressurized Water Reactors

- SLR-ISG-2021-02: Aging Management Criteria for Mechanical Portions

- SLR-ISG-2021-03: Aging Management Criteria for Structures Portions

- SLR-ISG-2021-04: Aging Management Criteria for Electrical Portions NRC/Industry Materials Exchange Meeting - May 25, 2022 15

Development of Revision 1 of GALL-SLR

  • Public meeting scheduled for June 1

- Need for the revision

- Limited scope of the revision

- Process

- Timeline

  • Products:

- Revision 1 of GALL-SLR, SRP-SLR and technical basis

- New document on resolution of public comments

  • A multi-year process - finalize end of 2024/2025 NRC/Industry Materials Exchange Meeting - May 25, 2022 16

Basis for GALL-SLR Revision 1 Changes

  • Focus is topics previously identified as possible SLR-ISGs; not a comprehensive review of the documents
  • Basis for updates

- Revised and new guidance based on:

o New or updated industry guidance, and Codes and standards o Plant operating experience o To fill gaps or make technical revisions in guidance identified from previous SLR reviews

- Substantive corrections

- Incorporate completed SLR-ISGs since initial GALL-SLR NRC/Industry Materials Exchange Meeting - May 25, 2022 17

Risk-Informing License Renewal

  • Part 54 is largely a deterministic rule

- Scoping and Screening, aging management review, TLAAs

- 54.21(a)(3) - For each structure and component identified..., demonstrate that the effects of aging will be adequately managed so that the intended function(s) will be maintained consistent with the CLB for the period of extended operation.

  • Current use of risk in guidance documents

- GALL-SLR XI.M41: Piping inspection locations are selected based on risk (i.e., susceptibility to degradation and consequences of failure).

NRC/Industry Materials Exchange Meeting - May 25, 2022 18

Risk-Informed Aging Management Programs

  • Submitted by NEI on February 18, 2021
  • Proposed (pilot) AMPs: GALL-SLR XI.M33 (selective leaching) and XI.E3 (non-EQ inaccessible power cables)
  • Public meeting scheduled for June 2
  • If approved will add to GALL-SLR Revision 1 NRC/Industry Materials Exchange Meeting - May 25, 2022 19

Risk-Informing LR and SLR

  • Public meeting tentative early July
  • Follow-up to March 2022 Regulatory Information Conference (RIC) session
  • Consider items that can be implemented now consistent with Part 54, or could require rulemaking NRC/Industry Materials Exchange Meeting - May 25, 2022 20

Contact Information Allen L. Hiser, Jr.

301-415-5650 Allen.Hiser@nrc.gov NRC/Industry Materials Exchange Meeting - May 25, 2022 21

Related Links Reactor License Renewal https://www.nrc.gov/reactors/operating/licensing/renewal.html Reactor License Renewal Guidance Documents https://www.nrc.gov/reactors/operating/licensing/renewal/guidance.html Guidance for License Renewal and Subsequent License Renewal https://www.nrc.gov/reactors/operating/licensing/renewal/slr/guidance.html LR and SLR Interim Staff Guidance (ISG) https://www.nrc.gov/reading-rm/doc-collections/isg/license-renewal.html Status of Initial License Renewal Applications https://www.nrc.gov/reactors/operating/licensing/renewal/applications.html Status of Subsequent License Renewal Applications https://www.nrc.gov/reactors/operating/licensing/renewal/subsequent-license-renewal.html NRC/Industry Materials Exchange Meeting - May 25, 2022 22

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