ML23244A175

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September 7, 2023, NRC Public Meeting with Steam Generator Task Force - NRC Presentation
ML23244A175
Person / Time
Issue date: 09/07/2023
From: Leslie Terry
NRC/NRR/DNRL/NCSG
To:
References
Download: ML23244A175 (1)
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Text

Divider Plate and Tube-to-Tubesheet Weld Cracking Guidance and Proposed Changes to Steam Generators Program Leslie Terry, NRR/DNRL/NCSG NRC Meeting with Industry Steam Generator Task Force September 7, 2023

Purpose

Background - Divider Plate and Tube-to-tubesheet Weld Cracking Guidance LR Guidance

- LR-ISG-2016-01 SLR Guidance

- Volumes 1 and 2 of NUREG-2191, Revision 0

- NUREG-2192, Revision 0, Further Evaluation (FE) 3.1.2.2.11 FE for plant-specific program to evaluate effectiveness of existing programs (Water Chemistry and Steam Generators) 3 Aging management review (AMR) items for managing cracking due to primary water stress corrosion cracking (PWSCC) by both the Water Chemistry and Steam Generators programs

- Steel (with nickel-alloy cladding);

nickel alloy divider plates

- Nickel alloy tube-to-tubesheet welds 3

Plant-specific program beyond (in addition to) existing programs (Water Chemistry and Steam Generators)

Feedback - Divider Plate Cracking Guidance 4

Material Weld Material Industry analysis (EPRI 3002002850) applicable and bounding Plant-specific program required beyond existing programs1 690 690 N/A No 600 600 Yes No 600 600 No Yes 1 If a plant-specific program is not necessary, then aging is managed by the existing Water Chemistry and Steam Generators programs

Feedback - Tube-to-tubesheet Weld Cracking Guidance 5

Tube Material Tubesheet Cladding Material Alternate Repair Criteria (C*, F*, W*,

or H*) approved for both hot-and cold-leg side of SG Industry analysis (EPRI 3002002850) applicable and bounding Plant-specific program required beyond existing programs1 690 690 N/A N/A No 690 600 N/A Yes No 690 600 N/A No Yes 600 N/A Yes N/A No 600 N/A No N/A Yes 1 If a plant-specific program is not necessary, then aging is managed by the existing Water Chemistry and Steam Generators programs

Proposed Changes to SLR AMP XI.M19, Steam Generators 6

Drafts for comment published in Federal Register (FR) on July 11, 2023 (88 FR 44160)

Revision 1 of NUREG-2191, Generic Aging Lessons Learned for Subsequent License Renewal (GALL-SLR)

Revision 1 of NUREG-2192, Standard Review Plan for Review of Subsequent License Renewal Applications for Nuclear Power Plants (SRP-SLR)

Supplement 1 of NUREG-2221, Technical Bases for Changes in the Subsequent License Renewal Guidance Documents NUREG-2191 and NUREG-2192 (Tech.

Basis Doc.)

Public Comment Period: July 11, 2023 - September 11, 2023 Comments should be submitted in writing by any of the following methods:

Going to https://www.regulations.gov and search for Docket ID NRC-2023-0096 Mailing comments to Office of Administration, Mail Stop: TWFN-7-A60M, U.S.

Nuclear Regulatory Commission, Washington, DC 20555-0001, ATTN: Program Management, Announcements and Editing Staff

Proposed Changes to SLR AMP XI.M19, Steam Generators Contd 7

Clarify type of corrosion that SG tube plugs may experience Clarify that extensive deposit buildup on the secondary side of SGs could affect tube integrity Update inspection frequency of divider plate assemblies, tube-to-tubesheet welds, heads (channel or lower/upper heads), and tubesheets to be consistent with the maximum inspection interval allowed by the SG tube inspection requirements for the given SG tube material in Revision 5 of the standard technical specifications that were published in September 2021 Add guidance on providing a comparison of plant-specific parameters and industry analyses (EPRI 3002002850) to determine if a plant is bounded by the industry analyses for SG divider plate assembly and tube-to-tubesheet weld cracking

Proposed Changes to SLR AMP XI.M19, Steam Generators Contd 8

  • Change from using a plant-specific AMP to the One-Time Inspection program for evaluating the effectiveness of the Water Chemistry and Steam Generators programs at mitigating PWSCC of divider plate assemblies and tube-to-tubesheet welds
  • Clarify that the Water Chemistry and Steam Generators programs are used to manage PWSCC of divider plate assemblies and tube-to-tubesheet welds, even if it is determined that use of the One-Time Inspection program is not needed to confirm their effectiveness at mitigating PWSCC
  • Update and add references

Summary

  • Currently, a plant-specific program to evaluate effectiveness of Water Chemistry and Steam Generators programs at mitigating PWSCC is necessary when:
  • Divider plate assemblies are Alloy 600 or contain Alloy 600 type weld materials, and industry analyses (EPRI 3002002850) are not applicable and bounding
  • Alloy 690 SG tubes and Alloy 600 tubesheet cladding, and industry analyses (EPRI 3002002850) are not applicable and bounding
  • Alloy 600 SG tubes, and alternative repair criteria within tubesheet approved for only the hot leg or cold-leg side of SG Public comment period for draft GALL-SLR, SLR-SRP, and Tech. Basis Doc.

closes on September 11, 2023 9

References LR-ISG-2016-01, Changes to Aging Management Guidance for Various Steam Generator Components, dated November 2016 (ML16237A383)

NUREG-2191, Revision 0, Generic Aging Lessons Learned for Subsequent License Renewal (GALL-SLR) Report, dated July 2017 (ML17187A031 (Volume 1) and ML17187A204 (Volume 2))

NUREG-2192, Revision 0, Standard Review Plan for Review of Subsequent License Renewal Applications for Nuclear Power Plants, dated July 2017 (ML17188A158)

EPRI PRI Report 3002002850, Steam Generator Management Program:

Investigation of Crack Initiation and Propagation in the Steam Generator Channel Head Assembly NUREG-2191, Revision 1, Draft for Comment, published July 2023, (ML23180A182 (Volume 1), ML23180A188 (Volume 2))

10

References Contd NUREG-2192, Revision 1, Draft for Comment, published July 2023 (ML23180A191)

Corrected Tables 3.1-1 and Table 3.2-1, published August 2023 (ML23213A036)

NUREG-2221, Supplement 1, Technical Bases for Changes in the Subsequent License Renewal Guidance Documents NUREG-2191 and NUREG-2192, Draft for Comment, published July 2023 (ML23180A208)

NUREG-1430, Revision 5, Standard Technical Specifications Babcock and Wilcox Plants, dated September 2021 (ML21272A363 (Volume 1) and ML21272A370 (Volume 2))

NUREG-1431, Revision 5, Standard Technical Specifications Westinghouse Plants, dated September 2021 (ML21259A155 (Volume 1) and ML21259A159 (Volume 2))

NUREG-1432, Revision 5, Standard Technical Specifications Combustion Engineering Plants, dated September 2021 (ML21258A421 (Volume 1) and ML21258A424 (Volume 2))

11

Questions 12

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