ML24051A034
| 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
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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 welds
- 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 Welds Initial License Renewal Subsequent License Renewal Included in NUREG-1801, Rev. 2, AMP XI.M19 (as revised by LR-ISG-2016-01)
Program Description Scope of Program Parameters Monitored or Inspected Detection of Aging Effects Monitoring and Trending Acceptance Criteria Included in NUREG-2191, AMP XI.M19 Program Description Scope of Program Parameters Monitored or Inspected Detection of Aging Effects Monitoring and Trending Acceptance Criteria Further Evaluation Guidance in NUREG-1800, Rev. 2 (as revised by LR-ISG-2016-01)
Section 3.1.2.2.11.1 for divider plate assembly Section 3.1.2.2.11.2 for tube-to-tubesheet welds Further Evaluation Guidance in NUREG-2192 Section 3.1.2.2.11.1 for divider plate assembly Section 3.1.2.2.11.2 for tube-to-tubesheet welds 6
General Visual Inspection Channel Head Interior Surfaces and Tubesheet Initial License Renewal Subsequent License Renewal Included in NUREG-1801, Rev. 2, AMP XI.M19 (as revised by LR-ISG-2016-01)
Program Description Scope of Program Parameters Monitored or Inspected Detection of Aging Effects Monitoring and Trending Acceptance Criteria Included in NUREG-2191, AMP XI.M19 Program Description Scope of Program Parameters Monitored or Inspected Detection of Aging Effects Monitoring and Trending Acceptance Criteria 7
Divider Plate Cracking Guidance Visual representation of Further Evaluation Section 3.1.2.2.11.1 8
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
Tube-to-Tubesheet Weld Cracking Guidance Visual representation of Further Evaluation Section 3.1.2.2.11.2 9
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
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
- 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 NUREG-1800, Revision 2, Standard Review Plan for Review of License Renewal Applications for Nuclear Power Plants, dated December 2010 (ML103490036)
NUREG-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)
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 Report 3002002850, Steam Generator Management Program: Investigation of Crack Initiation and Propagation in the Steam Generator Channel Head Assembly 11
References (contd)
NUREG-2191, Revision 1, Draft, published July 2023, (ML23180A182 (Volume 1),
ML23180A188 (Volume 2))
NUREG-2192, Revision 1, Draft, published July 2023 (ML23180A191)
Corrected Tables 3.1-1 and 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)
NRC Meeting with the Industry Steam Generator Task Force, September 7, 2023 Meeting Summary (ML23268A340)
Industry Slides (ML23240A002)
NRC Slides (ML23244A175) 12
Questions 13