ML25031A002
| ML25031A002 | |
| Person / Time | |
|---|---|
| Site: | Robinson  |
| Issue date: | 02/05/2025 |
| From: | Alexandra Siwy NRC/NRR/DNRL/NLRP |
| To: | |
| References | |
| Download: ML25031A002 (1) | |
Text
H.B. Robinson Unit 2 Subsequent License Renewal Safety Pre-Submittal Meeting 1
February 5, 2025
Agenda Opening Remarks Subsequent License Renewal (SLR) Project Team Overview of Robinson Nuclear Plant (RNP)
Key Lessons Learned SLR Application Topics of Interest
- Concrete Containment Bonded Tendon Prestress Aging Management Program (Plant-Specific)
- Determination of T0 for RNP Closing Remarks 2
SLR Project Team Rounette Nader*: VP, New Nuclear Generation and License Renewal Mark Pyne: Director, License Renewal and Subsequent License Renewal Daniel Roberts*: Manager, Subsequent License Renewal Mechanical Class 1 Mechanical Non-Class 1 Civil Electrical Charles Tomes David Lee David Morris*
Bert Spear Chris Saville*
Erik Wagner Heather Galloway Steve Graham Crystal Bowers Lori Hekking Joe Terrell Mark Hager Vendor Support Mark Rinckel Matthew Peters Structural Integrity Associates Westinghouse Licensing MPR Paul Guill
- Speakers 3
Duke Energy Carolinas Service Area Duke Energy Progress Service Area Overlapping Areas Overview of Robinson Nuclear Plant Located in Hartsville, SC 100% owned and operated by Duke Energy The Robinson site covers approximately 5,900 acres of land Including and surrounding Lake Robinson (2,250 acres)
Initial License Renewal (2004) based on NUREG-1801, GALL Report, Revision 0 IP 71003 Phase IV completed December 2018 (ML19038A210)
OL 40 Yrs 60 Yrs 80 Yrs Robinson Unit 2 1970 2010 2030 2050
Overview of Robinson Nuclear Plant Single Unit Westinghouse Three-loop Nuclear Steam Supply System (NSSS)
Pressurized Water Reactor (PWR)
Reactor Output: 2,339 MWt Power Output: 787 MWe Core Power History:
1970: 2,200 MWt Initial 1979: 2,300 MWt Power Uprate 2002: 2,339 MWt Power Uprate Ultimate Heat Sink: Lake Robinson Inlet: Southern end of lake Discharge: Northern end of lake 24-month Refueling Cycle
Overview of Robinson Nuclear Plant
SLR Key Lessons Learned Involvement in the NEI License Renewal Taskforce (LRTF)
Engagement in ongoing NRC efficiency efforts Participating and following to ensure quality and consistent applications Worked with NEI to provide feedback on the new NRC graded approach pilot program Extensive aging management experience All 11 units have renewed Operating Licenses 10 of 11 units are operating in the Period of Extended Operation Lessons learned:
Experienced team on second SLR project; many also with initial LR experience Participated in peer reviews of other industry SLR applications Reviewed industry RAIs Increase quality of SLR application Reduce number of RAIs
SLR Application Target Submittal Date: April 2025 CERTREC ePortal:
- Ability to be updated as necessary throughout audit Operating Experience (OE)
- Searched action requests (AR) from 7/1/2014 - 8/14/2024
- Utilized over 300 keywords for initial OE search
- Reviewed approximately 14,600 ARs
- Identified no new aging effects
SLR Application Adherence to NUREG-2191 Rev. 0, including:
- SLR-ISG-2021-01-PWRVI
- SLR-ISG-2021 MECHANICAL
- SLR-ISG-2021-03-STRUCTURES
- SLR-ISG-2021-04-ELECTRICAL Peer Review
- Over 6,900 AMR lines
- Highly consistent with GALL-SLR: >99.87% with notes A through E
SLR Application Existing Plant-Specific AMP: Concrete Containment Bonded Tendon Prestress Robinson SLR AMPs Consistent with GALL Consistent with Enhancement(s)
With Exception Only With Exception and Enhancement Plant Specific Existing 9
28 0
1 1
39 New 6
0 3
0 9
Total 48
SLR AMPs New AMPs One Time Inspection (M32)
Selective Leaching (M33)
ASME Code Class 1 Small-Bore Piping (M35)
Inspection of Internal Surfaces in Miscellaneous Piping and Ducting Components (M38)
Internal Coatings/Linings for In-Scope Piping (M42)
Electrical Insulation for Inaccessible Medium-Voltage Power Cables (E3A)
Electrical Insulation for Inaccessible Instrument and Control Cables (E3B)
Electrical Insulation for Inaccessible Low-Voltage Power Cables (E3C)
Electrical Cable Connections (E6)
AMPs with Exceptions Internal Coatings/Linings for In-Scope Piping (M42)
ASME Section XI, Subsection IWE (XI.S1)
Electrical Insulation for Inaccessible Medium-Voltage Power Cables (E3A)
Electrical Insulation for Inaccessible Low-Voltage Power Cables (E3C)
Topics of Interest Concrete Containment Bonded Tendon Prestress AMP (Plant-Specific)
Determination of T0 for Robinson for use in SLRA Section 4.2.3
Concrete Containment Bonded Tendon Prestress AMP (Plant-Specific)
Existing plant-specific AMP that manages loss of prestress to maintain component intended function AMP was reviewed and accepted during initial license renewal Based on the principals described in Regulatory Guide 1.90, Inservice Inspection of Prestressed Concrete Containment Structures with Grouted Tendons, Alternative B Only operating plant in USA with grouted tendon configuration Robinson tendons are placed inside a heavy wall six-inch galvanized steel pipe sheath that after initial tensioning was filled with grout to provide corrosion resistance AMP visually inspects and measures vertical displacement of containment building exterior concrete during the 10 CFR 50 Appendix J (XI.S4) Integrated Leak Rate Test 13
Determination of T0 for Robinson for use in SLRA Section 4.2.3 The 2019 Edition of ASME Section III, Division 1, NB-2331(a)(5) provides an alternative to use a fracture toughness-based reference temperature of RTT0 in place of RTNDT for the calculation of RTPTS On March 28, 2024, WCAP-18909-NP, Revision 1 and WCAP-18933-NP, Revision 0, were submitted to the NRC as topical reports (ML24088A214)
- A public meeting was held on May 22, 2024 (ML24165A236) to discuss the path forward for reviewing the reports
- It was concluded that the reports would be reviewed as white papers, and the original submittal was supplemented by letter dated June 28, 2024 (ML24180A011)
The staff provided feedback on January 2, 2025 (ML24353A347)
Duke Energy plans to follow the guidance in NB-2331(a)(5), as described by the staff, for calculation of RTPTS 14
Closing Remarks The Robinson SLR application will be consistent with GALL-SLR and industry guidance to the greatest extent possible Duke Energy has been engaged with the development of SLR industry guidance and SLR-ISGs Duke Energy has supported industry SLR application reviews and incorporated recent RAI responses Duke Energy will submit a high quality SLR application to support an 18-month staff review Robinson SLRA submittal remains on schedule to submit April 2025
Acronyms AMP - Aging Management Program AMR - Aging Management Review CFR - Code of Federal Regulations GALL - Generic Aging Lesson Learned IPAR - Integrated Plant Assessment Report ISG - Interim Staff Guidance NEI - Nuclear Energy Institute NRC - Nuclear Regulatory Commission NSSS - Nuclear Steam Supply System NUREG - Nuclear Regulatory Guide OE - Operating Experience OL - Operating License PWR - Pressurized Water Reactor RAI - Request for Additional Information RNP - Robinson Nuclear Plant SLR - Subsequent License Renewal SLRA - Subsequent License Renewal Application TLAA - Time Limited Aging Analysis