ML22245A082

September 8 2022 NRC Public Meeting with Steam Generator Task Force - NRC Presentation Final

ML22245A082
Person / Time
Issue date:	09/08/2022
From:	Office of Nuclear Reactor Regulation
To:
Terry L
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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

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 1 Or converting to Revision 5 of Standard Technical Specifications 2

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

Tubes With Increased Degradation Susceptibility

• 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

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Template: 4. The nondestructive examination techniques utilized for each degradation mechanism found, page G-4 5

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Template: 4. The nondestructive examination techniques utilized for each degradation mechanism found, page G-4 6

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Well Written Example

• ML22108A224

- 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