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 1
May 22, 2024
AGENDA Pressurize Thermal Shock Screening Criteria 2
Purpose of Request for Topical Report Review and Approval Regulatory Path Summary of Topical Reports
- WCAP-18933-NP Conclusion NRC Feedback
PURPOSE Pressurize Thermal Shock Screening Criteria 3
To discuss path forward for review of topical reports Support timely submittal of the RNP SLR application in 2nd quarter 2025 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
Regulatory Path Utilize an acceptable methodology in 10 CFR 50.61 to develop RTNDT for weld
- W5214.
- 10 CFR 50.61(a)(5) - RTNDT(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.
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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).
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NRC Feedback NRC FEEDBACK 8