ML22245A082
| ML22245A082 | |
| Person / Time | |
|---|---|
| Issue date: | 09/08/2022 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Terry L | |
| References | |
| Download: ML22245A082 (9) | |
Text
NRC Feedback on EPRI Integrity Assessment Guideline Appendix G Implementation NRC Meeting with Industry Steam Generator Task Force (SGTF)
September 8, 2022
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Background===
- Technical specifications require a steam generator tube inspection report (SGTIR) be submitted to the NRC
- Appendix G in Revision 5 of EPRI Steam Generator Integrity Assessment Guideline (IAG) provides a template for the SGTIR
- Plants adopting Technical Specifications Task Force-577 (TSTF-577)1 shall include the additional information in the template
- For plants not adopting TSTF-577, the IAG recommends considering use of the template 2
1 Or converting to Revision 5 of Standard Technical Specifications
Purpose
- NRC is receiving SGTIRs based on the IAG Appendix G template
- NRC staff wanted to highlight some particularly good examples of information provided in recent SGTIR submittals 3
- Appendix G highlights multiple sub-populations of tubes as examples:
- Section 1
- Tube sub-populations with increased degradation susceptibility (e.g., tubes with potential high residual stress (- two sigma), other areas based on growth rates or design features)
- Section 3
- Periphery tubes in the high-flow region
- Potential high residual stress tubes
- Hot-leg dents/dings greater than 5 volts 4
Tubes With Increased Degradation Susceptibility 4
Template: 4. The nondestructive examination techniques utilized for each degradation mechanism found, page G-4 5
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6 Template: 4. The nondestructive examination techniques utilized for each degradation mechanism found, page G-4 6
Well Written Example
- Detailed explanation about the definitions of dents and dings, in both the historical and current use context
- Feed regulating valve disc stack photograph 7
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Summary
- Use of IAG Revision 5 Appendix G Template has resulted in more comprehensive SGTIRs
- This presentation highlighted examples of well written SGTIRs 8
8
Questions 9