ML25240A903

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September 4 2025 NRC Public Meeting with Steam Generator Task Force - NRC Presentation
ML25240A903
Person / Time
Issue date: 09/04/2025
From: Leslie Terry
NRC/NRR/DNRL/NCSG
To:
References
Download: ML25240A903 (13)
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Text

Update on License Renewal Guidance Steam Generators Program Corrosion and Steam Generator Branch, NRR/DNRL NRC Public Meeting with Industry Steam Generator Task Force September 4, 2025

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Background===

  • SLR applications for plants with A690TT SG tubing and TS based on TSTF-577 (including conversion to STS, Rev. 5) have proposed exceptions to the 72 EFPM maximum interval between primary-side visual inspections recommended in the Steam Generators AMP in GALL-SLR, Rev. 0.
  • The exceptions requested a 96 EFPM maximum interval between primary-side visual inspections consistent with the increased maximum inspection interval for A690TT SG tubing in TSTF-577.
  • The TSTF-577 maximum interval between tube inspections of 96 EFPM applies ONLY to SGs with A690TT tubing.
  • NRC recently published GALL-SLR, Rev. 1, that updated the guidance related to primary-side visual inspections to reflect the 96 EFPM maximum inspection interval for units with A690TT SG tubing and TS based on TSTF-577.
  • Industry requested clarification on the GALL-SLR, Rev. 1, changes related to the maximum inspection interval between primary-side visual inspections and the role of exceptions.

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Update on License Renewal Guidance Subsequent License Renewal Guidance Revision 1 Published July 15, 2025 GALL-SLR (NUREG-2191, Rev. 1)

Volume 1 - ML25113A021 Volume 2 - ML25113A022 SRP-SLR (NUREG-2192, Rev. 1, ML25113A023)

Technical Bases for Changes (NUREG-2221, Supp. 1, ML25113A024)

Proposed Changes Discussed in Sept. 2023 Meeting with SGTF (ML23244A175)

Initial License Renewal Guidance (No Recent Change)

GALL (NUREG-1801, Rev. 2, ML103490041)

SRP-LR (NUREG-1800, Rev. 2, ML103490036)

LR-ISG-2016-01 (ML16237A383) 3

Primary-Side Visual Inspections Steam Generators Program

  • The changes below in strikeout and bold text were made in Rev. 1:

In summary, the NEI 97-06 (NEI 2011-TN9268) program provides guidance on parameters to be monitored or inspected except for steam generator divider plate assemblies, tube-to-tubesheet welds, heads (channel or lower/upper heads), and tubesheets. For these latter components, visual inspections are performed at least every 72 effective full power months or every third refueling outage, whichever results in more frequent inspections. These inspections may be performed every 96 effective full power months for units for which the technical specifications allow for extended steam generator inspection intervals. These inspections of the steam generator head interior surfaces including the divider plate are intended to identify signs that cracking or loss of material may be occurring (e.g., through identification of rust stains).

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Clarification 1 Clarification Requested TSTF-577 plants that have previously taken an exception on their SLR application.

Response

An exception for this topic means the plant has been approved for a maximum interval of 96 EFPM between primary-side visual inspections, matching the maximum interval between SG tube inspections in their TSs.

This is consistent with the newly issued guidance. No action is required.

5

Clarification 2 Clarification Requested Clarify whether the exception discussed for A690TT SGs also applies to plants with A600TT SGs without cracking with an OA for four 18-month cycles.

Response

  • No. The purpose of the exception was to align the guidance in GALL-SLR, Rev. 0 (72 EFPM maximum interval between primary-side visual inspections) with the approved TS for plants with A690TT tubing and TS based on TSTF-577 (96 EFPM maximum interval between SG tube inspections).
  • The SLR exceptions and guidance update does not affect plants with A600TT SG tubing because none have tube inspection intervals greater than 72 EFPM approved in their TS.

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Clarification 3 7

Clarification Requested TSTF-577 plants (with A690TT SG tubing and/or A600TT SG tubing without cracking) that are in the SLR application process that have not yet taken an exception.

Response

  • For TSTF-577 plants with A690TT SG tubing, the inspection intervals are now aligned, and consistency with the SLR guidance means they would have a maximum interval of 96 EFPM between tube inspections and primary-side visual inspections. There is no reason for an exception.
  • For TSTF-577 plants with A600TT SG tubing, the maximum interval of 72 EFPM between primary-side visual inspections would apply because that is the maximum interval between tube inspections approved in the TS for any of these plants. No exception is needed for alignment between the TS and license renewal guidance.

Maximum Intervals for Tube and Primary-Side Visual Inspection According to TS and GALL-SLR, Rev. 1 Tubing Material Technical Specifications TSTF-577/STS Rev. 5 TSTF-449 or TSTF-510 Tube Inspection Primary Visual Tube Inspection Primary Visual A690TT 96 EFPM 96 EFPM 72 EFPM 72 EFPM A600TT 72 EFPM 72 EFPM 48 EFPM 72 EFPM A600MA 24 EFPM 72 EFPM 24 EFPM 72 EFPM 8

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Summary

  • GALL-SLR, Rev. 1, updated the guidance related to primary-side visual inspections to reflect the 96 EFPM maximum inspection interval for units with A690TT tubing.
  • The maximum interval of 96 EFPM applies to plants with a maximum interval of 96 EFPM for tube inspections in their TS. This applies only to plants with A690TT SG tubing.
  • Exceptions are no longer needed for plants with A690TT tubing and TS based on TSTF-577/STS, Rev. 5.
  • Plants with A690TT SG tubing and TS based on TSTF-449 or TSTF-510, and plants with A600TT SG tubing and TS based on TSTF-577/STS, Rev. 5, are aligned with the 72 EFPM maximum interval in GALL-SLR, Rev. 1.

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References

References (continued)

Abbreviations AMP - Aging Management Program EFPM - Effective Full-Power Month GALL - Generic Aging Lessons Learned ISG - Interim Staff Guidance LR - License Renewal MA - Mill Annealed NEI - Nuclear Energy Institute OA - Operational Assessment SG - Steam Generator SGTF - Steam Generator Task Force SLR - Subsequent License Renewal SRP - Standard Review Plan STS - Standard Technical Specifications TS - Technical Specifications TSTF - Technical Specifications Task Force TT - Thermally Treated 12 12

Questions 13

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