ML24134A024
| ML24134A024 | |
| Person / Time | |
|---|---|
| Site: | Robinson  |
| Issue date: | 05/22/2024 |
| From: | Lingham S NRC/NRR/DNRL/NLRP |
| To: | |
| References | |
| Download: ML24134A024 (8) | |
Text
Path Forward for NRC Review of RNP Topical Reports for SLR
May 22, 2024
1 AGENDA
Purpose of Request for Topical Report Review and Approval Regulatory Path Summary of Topical Reports
- WCAP-Pressurize Thermal Shock Screening Criteria18909-NP
- WCAP-18933-NP Conclusion NRC Feedback
2 PURPOSE
To discuss path forward for review of topical reports
Support timely submittal of the RNP SLR application in 2nd quarter 2025 Pressurize Thermal Shock Screening Criteria Submit topical reports for NRC review/approval
- Increase efficiency of SLR application review/approval
- Allow staff to meet 18-month review schedule
Provide demonstration of compliance to 10 CFR 50.61 for weld #W5214 for 70 Effective Full Power Years (i.e., 80 years of operation)
- Utilize an acceptable methodology to meet PTS screening criteria
- Utilize WCAP-18909 and WCAP -18933 as input to satisfy the PTS screening criteria 3
Regulatory Path
Utilize an acceptable methodology in 10 CFR 50.61 to develop RTNDT for weld
- W5214.
- 10 CFR 50.61(a)(5) - RT NDT(U) means the reference temperature for a reactor vessel material in the pre-service or unirradiated condition, evaluated according to the procedures in the ASME Code, Paragraph NB-2331 or other methods approved by the Director, Office of Nuclear Reactor Regulation.
Develop RTT0 with 2019 Edition ASME Subsection NB-2331(a)(5) based on fracture toughness.
Duke will illustrate in the SLR application that the RTNDT for weld #W5214 succeeds in satisfying the PTS screening criteria for 80 years.
4 Summary WCAP-18909 NP
Purpose:
Measure initial unirradiated fracture toughness-based reference temperature RTT0 for #W5214 weld material
Develop T0 with fracture toughness test of unirradiated specimen
- ASTM E1921 Develop material specific RTT0 with fracture toughness results
- ASME Section III, NB-2331(a)(5)
Duke will develop RTT0 for #W5214 and shows the PTS screening criterion are met for 80 years
- RTNDT(U) = RTT0 = T0 + 35F + 2
- RTPTS = RTT0 + Charpy Shift + Margin
5 Summary WCAP-18933 NP
Purpose:
Measure irradiated RTT0 for Robinson #W5214 weld material
- Note: Duke will submit revised WCAP-18933 to focus review only on #W5214 material
Develop irradiated T0 with fracture toughness test
- ASTM E1921 Develop material specific RTT0 with fracture toughness results
- ASME Section III, NB-2331(a)(5)
Illustrate that the difference between the irradiated RTT0 and the Charpy-based RTPTS methods is minimal to demonstrate margin for the PTS screening criterion
6 Conclusion
Provisions in 10 CFR 50.61(a)(5) allow the use of 2019 Edition ASME Subsection NB-2331(a)(5) to develop RTT0.
Duke requests review and approval of WCAP-18909 and WCAP-18933.
- Duke will resubmit WCAP-18933 to limit NRC review and approval of only the material associated with the weld #W5214.
Duke will utilize these WCAPs as input to demonstrate weld material #W5214 satisfies the 10 CFR 50.61 screening criterion in the SLR application for 80 years (70 EFPY).
7 NRC Feedback
NRC FEEDBACK
8