ML24051A034

February 22 2024 NRC Public Meeting with Steam Generator Task Force - NRC Presentation

ML24051A034
Person / Time
Issue date:	02/22/2024
From:	Gregory Makar NRC/NRR/DNRL/NCSG
To:
References
Download: ML24051A034 (1)

Text

Channel Head Inspection Guidance

Greg Makar, NRR/DNRL/NCSG

NRC Meeting with Industry Steam Generator Task Force February 22, 2024

Background

• Expand on the NRC presentation and meeting summary from September 2023

• Principal guidance documents are:

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

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

- LR-ISG-2016- 01

- GALL-SLR (NUREG-2191, Rev. 0)

- SRP-SLR (NUREG-2192, Rev. 0)

2 Purpose

Clarify NRC guidance on steam generator primary surface inspections for initial and subsequent license renewal (LR and SLR)

• Divider plate assembly

• Tube-to-tubesheet welds

• Channel head interior surface

• Tubesheet

3 Terminology

• A plant -specific aging management program (AMP) is an AMP that includes additional programs beyond the Water Chemistry and Steam Generators programs (e.g., One-Time Inspection)

- Defined in SRP-SLR and LR-ISG-2016- 01

• Industry analysis applicable and bounding refers to EPRI Report 3002002850, Steam Generator Management Program: Investigation of Crack Initiation and Propagation in the Steam Generator Channel Head Assembly

4 General Visual Inspection

• Intended to identify signs of cracking or loss of material (e.g., made visible by rust stains)

• Applies to the following, regardless of material:

- Divider plate assembly

- Tube-to-tubesheet we l d s

- Channel head interior surface

- Tubesheet (primary side)

• Materials, alternate repair criteria, and applicability of bounding industry analysis determine the need for a plant-specific AMP

5 General Visual Inspection Divider Plate Assembly and Tube-to-Tubesheet We l d s Initial License Renewal Subsequent License Renewal Included in N U REG -1801, Rev. 2, AMP Included in NUREG-2191, AMP XI.M19 XI.M19 (as revised by LR-ISG-2016- 01)* Program Description

• Program Description

• Scope of Program

• Scope of Program

• Parameters Monitored or Inspected

• Parameters Monitored or Inspected

• Detection of Aging Effects

• Detection of Aging Effects

• Monitoring and Trending

• Monitoring and Trending

• Acceptance Criteria

• Acceptance Criteria Further Evaluation Guidance in Further Evaluation Guidance in N U REG-1800, Rev. 2 (as revised by N U REG-2192 LR-ISG-2016- 01)* Section 3.1.2.2.11.1 for divider plate

• Section 3.1.2.2.11.1 for divider plate assembly assembly

• Section 3.1.2.2.11.2 for tube-to-

• Section 3.1.2.2.11.2 for tube-to-tubesheet welds tubesheet welds

6 General Visual Inspection Channel Head Interior Surfaces and Tubesheet

Initial License Renewal Subsequent License Renewal Included in N U REG -1801, Rev. 2, AMP Included in NUREG-2191, AMP XI.M19 XI.M19 (as revised by LR-ISG-2016- 01)* Program Description

• Program Description

• Scope of Program

• Scope of Program

• Parameters Monitored or Inspected

• Parameters Monitored or Inspected

• Detection of Aging Effects

• Detection of Aging Effects

• Monitoring and Trending

• Monitoring and Trending

• Acceptance Criteria

• Acceptance Criteria

7 Divider Plate Cracking Guidance

Visual representation of Further Evaluation Section 3.1.2.2.11.1 Material Weld Material Industry analysis Plant-specific (EPRI 3002002850) program required applicable and beyond existing bounding programs1 690 690 N /A No 600 600 Ye s No 600 600 No Ye s

1 If a plant-specific program is not necessary, then aging is managed by the existing Water Chemistry and Steam Generators programs

8 Tube-to-Tubesheet Weld Cracking Guidance

Visual representation of Further Evaluation Section 3.1.2.2.11.2 Tube Tubesheet Alternate Repair Industry analysis Plant-specific Mate ri al Cladding Criteria (C*, F*, W*, (EPRI 3002002850) program Mate ri al or H*) approved for applicable and required both hot-and cold-bounding beyond leg side of SG existing programs1 690 690 N /A N /A No 690 600 N /A Ye s No 690 600 N /A No Ye s 600 N /A Ye s N /A No 600 N /A No N /A Ye s

1 If a plant-specific program is not necessary, then aging is managed by the existing Water Chemistry and Steam Generators programs

9 Summary

• The Steam Generators and Water Chemistry AMPs are used by all plants to manage aging of the primary surfaces

• Visual inspection of primary surfaces is in the current guidance for both initial and subsequent license renewal

• S tea m Gen erato rs A M P

• Further Evaluation Sections 3.1.2.2.11.1 and 3.1.2.2.11.2

• A plant-specific program may be needed to evaluate the effectiveness of the Steam Generators and Water Chemistry programs

• The need for a plant-specific program is evaluated according to:

• The divider plate assembly, tube, and tubesheet cladding materials

• Whether or not the steam generator is bounded by the industry analyses

• Alternate repair criteria affecting the tube-to-tubesheet welds

10 References

• N U REG-1800, Revision 2, Standard Review Plan for Review of License Renewal Applications for Nuclear Power Plants, dated December 2010 (ML10 3490036)

• N U REG-1801, Revision 2, Generic Aging Lessons Learned (GALL) Report, dated December 2010 (ML103490041)

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

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

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

• EPRI Report 3002002850, Steam Generator Management Program: Investigation of Crack Initiation and Propagation in the Steam Generator Channel Head Assembly

11 References (cont d)

• N U REG-2191, Revision 1, Draft, published July 2023, (ML23180A182 (Volume 1),

ML23180A188 (Volume 2))

• N U REG-2192, Revision 1, Draft, published July 2023 (ML23180A191)

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

• N U REG-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)

• NRC Meeting with the Industry Steam Generator Task Force, September 7, 2023

• Meeting Summary (ML23268A340)

• Industry Slides (ML23240A002)

• NRC Slides (ML23244A175)

12 Questions

13