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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Text

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

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

NRC License Renewal Overview

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

- Environmental review 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 10 NRC/Industry Materials Exchange Meeting - May 25, 2022

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

Consideration of 40-Year License Renewal Terms and Plant Operation to 100 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

- Both of the above activities were discontinued

- Considered extension of on-going research for 60 years 12 NRC/Industry Materials Exchange Meeting - May 25, 2022

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

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

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

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

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

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).

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

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

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

Contact Information Allen L. Hiser, Jr.

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

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