ML25059A163
| ML25059A163 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 03/06/2025 |
| From: | Mary Johnson Dominion Energy, NRC/NRR/DNRL/NLRP |
| To: | |
| References | |
| Download: ML25059A163 (1) | |
Text
V. C. SUMMER NUCLEAR STATION (VCSNS) UNIT 1 SUBSEQUENT LICENSE RENEWAL APPLICATION ACRS Committee Meeting March 6, 2025 March 6, 2025 1
Agenda March 6, 2025 2
- Introductions
- V.C. Summer Site Overview
- Technical Topics
- Closing Remarks
Introductions
March 6, 2025 3
Beth Jenkins, VCSNS Site Vice President James Holloway, Vice President Nuclear Engineering & Fleet Support Brenda Brown, Director - Nuclear Engineering - VCSNS Calvin Pugh, SLR Director Richard Burtt, Manager - Nuclear Site Engineering - VCSNS Keith Miller, SLR Supervisor Chuck Tomes, SLR Technical Lead Pratt Cherry, SLR Mechanical Lead
Site Layout March 6, 2025 4
V.C. Summer Overview March 6, 2025 5
Station Milestones Year Initial License (2775 MWt) 1982 4.5% Uprate Approved (2900 MWt) 1996 Renewed License Issued 2004 Entered Period of Extended Operation 2022 Current License Expiration 2042
V.C. Summer Overview March 6, 2025 6
- Westinghouse 3-loop PWR
- Refueling frequency - 18 months
- Regulatory Status
- Reactor Oversight Process Actions Matrix Column 1
- All ROP indicators are Green
- Recent capacity factors:
Year Capacity Factor 2020 91.07 2021 82.69 2022 101.52 2023 88.82 2024 87.46
V.C. Summer Overview March 6, 2025 7
Significant Plant Upgrades Since Initial License Renewal Fire Protection Piping & Valve Replacement Campaign Service Water Chemical Treatment Optimization Emergency Feedwater/Service Water Cured-In-Place-Pipe Liner Installation Main Transformer Replacement Electro-Hydraulic Control Digital Installation Service Water Cavitation Mitigation EDG Fuel Oil Piping Upgrade Safety-Related Chiller Replacements
Subsequent License Renewal Application March 6, 2025 8
- Project Team Experience
- V.C. Summer SLR is the 3rd Dominion SLR project performed by this team
- Team also has experience from SLR projects with other utilities and initial license renewal projects
- Industry Involvement
- Participant in peer reviews of other SLRAs
- Active participant in the NEI License Renewal Task Force
Subsequent License Renewal Application March 6, 2025 9
- Regulatory and Industry Guidance
- Focused on consistency with NUREG-2191, NUREG-2192, NRC Interim Staff Guidance, and NEI 17-01
- Benchmarking
- Recent SLR applications and correspondence (e.g.,
Supplements, RAIs) reviewed for insights
- Built on Surry and North Anna SLR experience (e.g.,
leveraged Fleet programs, incorporated lessons learned from NRC reviews)
- Conducted a peer review of our SLRA
Subsequent License Renewal Application March 6, 2025 10 Aging Management Reviews
- High AMR consistency for SLR (>99% of AMR items use Notes A through E)
Operating Experience
- 10 years of station operating experience reviewed for aging-related insights
- License renewal self-assessment performed in 2021
- NRC IP 71003 inspection identified no findings or violations (2022)
Aging Management Programs
- 49 programs for SLR
Subsequent License Renewal Application March 6, 2025 11 AMP Category AMPs Consistent with GALL AMPs Consistent with Enhancement AMPs with Exceptions AMPs with Exceptions and Enhancements Plant Specific AMPs Existing 40 13 22 2
3 0
New 9 9
0 0
0 0
Total 49
Technical Topics March 6, 2025 12 Service Water Pond EDG Performance Primary Shield Wall & Reactor Vessel Supports
Service Water Pond March 6, 2025 13
March 6, 2025 14 Service Water Pond Aging Management Dams and embankments inspected for erosion, movement, surface cracks, sloughing, rip-rap failures, weed and brush control, animal burrows, etc - annually Dam elevation, alignment, and slope surveys are conducted -
every 5 years Sedimentation - bottom elevation surveys (two) were conducted - enhancement to conduct on periodic basis Federal Energy Regulatory Commission dam inspection -
every 3 years
EDG Performance March 6, 2025 15
- VCSNS received a White performance deficiency identified when the licensee failed to identify and correct a condition adverse to quality for the Emergency Diesel Generator (EDG) fuel oil system that left the system vulnerable to piping cracks and eventually resulted in the failure of the A EDG during testing on November 2, 2022.
- The direct cause was a circumferential crack formed at the root of the last engaged male fuel oil pipe nipple thread. The crack propagated through-wall 140 degrees during a 24-hour surveillance run.
- VCSNS completed a Root Cause Evaluation (RCE) to further understand the organizational, process, and material aspects of the event.
EDG Performance March 6, 2025 16
- Replaced threaded schedule 40 piping with schedule 80, mostly welded joints, flexible hoses and flanged connection.
- Additionally, corrective actions from the RCE were completed to correct organization, equipment, and process issues identified.
- Corrective Action Program and Plant Health process changes, and the Prevention Culture Model implementation
- All monthly and periodic EDG surveillance runs since the piping modification have been performed satisfactorily.
EDG Performance March 6, 2025 17 Piping Arrangement - Then Piping Arrangement - Now
Technical Topics Primary Shield Wall & RV Supports March 6, 2025 18
V.C. Summer SLR Summary March 6, 2025 19
- Dominion has a produced a quality SLR application that has a high degree of consistency with GALL-SLR, and incorporates lessons learned from previous SLRAs
- The V.C. Summer SLRA was developed by the very experienced team that wrote the Surry and North Anna SLRAs
- Dominion Energy will continue to invest in people, program enhancements, and equipment modifications through the SPEO
Advisory Committee on Reactor Safeguards Virgil C. Summer Nuclear Station, Unit 1 Subsequent License Renewal Application (SLRA)
Safety Evaluation (SE)
March 6, 2025 Marieliz Johnson, Project Manager Steve Downey, Reactor Inspector
Presentation Outline
- Virgil C. Summer Nuclear Station (VC Summer), Unit 1 Licensing History
- VC Summer Aging Management Programs (AMPs)
- Specific Technical Areas of Review
- Inspections and Material Condition of the plant
VC Summer, Unit 1:
Licensing History Unit Initial License Initial License Renewal Application Renewed License Expiration Date 1
11/12/1982 8/6/2002 4/23/2004 8/6/2042 Initial License Renewal Subsequent License Renewal Application Submitted 8/17/2023 Acceptance Determination 10/16/2023 Safety Evaluation 1/21/2025 3
VC Summer, Unit 1 Aging Management Programs SLRA - Original Disposition of AMPs o 49 AMPs in total o 40 existing programs
- 14 consistent with GALL-SLR
- 26 consistent with enhancements and/or exceptions o
9 new programs All consistent SE - Final Disposition of AMPs o 49 AMPs in total o 40 existing programs
- 13 consistent with GALL-SLR
- 27 consistent with enhancements and/or exceptions o
9 new programs All consistent 4
Specific Areas of SLRA Review
- Inspection of Water - Control Structures Associated with Nuclear Power Plants AMP
- Biological Shield Wall - Irradiated Concrete and Steel
- primary shield wall fluence levels
- inspections of reactor vessel supports 5
Region II AMP Inspections 6
License Renewal Inspection Program for Initial Period of Extended Operations Inspection Dates Results U1 & U2 IP 71003 Phase 1 October 11 - November 5, 2021 ML22026A345 No Findings Unit 1 IP 71003 Phase 2 January 31 - February 18, 2022 ML22069B079 No Findings Unit 1 IP 71003 Phase 4 Expected 2027 - 2032 NA
Region II: AMP Inspections 7
ROP Baseline Inspections Inspection Date Aging Management Program IP71111.08 ISI Each outage Boric Acid Corrosion Surveillance Bottom Mounted Instrumentation Inspection Containment ISI Program - IWE/IWL In-Service Inspection Plan Reactor Vessel Internals Inspection Steam Generator Management Program IP71111.07 Heat Sink Annually Triennial:
3Q 2022 Heat Exchanger Inspections Service Water System Reliability and In-Service Testing Program IP 71111.21N.05 Fire Protection Triennial (FPTI) 3Q 2022 Ensure that selected SSCs are being managed for aging in accordance with the appropriate aging management programs IP71111.21M Comprehensive Engineering Team Inspection (CETI) 2Q 2024 Ensure that selected SSCs are being managed for aging in accordance with the appropriate aging management programs IP71111.12 Maintenance Effectiveness 7-8 samples per year Maintenance Rule Structural Monitoring Program Service Water System Reliability and In-service Testing Program Inspections for Mechanical Components IP71152 Problem Identification and Resolution (PI&R) 6-10 samples per year Any applicable AMP based on conditions identified in the licensees Corrective Action Program
No findings from License Renewal Program inspections 2023: White self-revealed finding related to the Emergency Diesel Generator (EDG) fuel oil system that left the system vulnerable to piping cracks and eventually resulted in the failure of the A EDG during testing.
8 Resident Inspector Insight and Inspection Results Region II AMP Inspections
On the basis of its review of the SLRA, the staff determined that the requirements of 10 CFR 54.29(a) have been met for the subsequent license renewal of VC Summer, Unit 1.
SLRA Review Conclusion 9