IR 05000369/2024004
| ML25034A082 | |
| Person / Time | |
|---|---|
| Site: | Mcguire, McGuire  |
| Issue date: | 02/05/2025 |
| From: | Robert Williams Division of Operating Reactors |
| To: | Pigott E Duke Energy Carolinas |
| References | |
| IR 2024004 | |
| Download: ML25034A082 (11) | |
Text
SUBJECT:
MCGUIRE NUCLEAR STATION - INTEGRATED INSPECTION REPORT 05000369/2024004 AND 05000370/2024004
Dear Edward Pigott:
On December 31, 2024, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at McGuire Nuclear Station. On January 15, 2025, the NRC inspectors discussed the results of this inspection with you and other members of your staff. The results of this inspection are documented in the enclosed report.
No findings or violations of more than minor significance were identified during this inspection.
This letter, its enclosure, and your response (if any) will be made available for public inspection and copying at http://www.nrc.gov/reading-rm/adams.html and at the NRC Public Document Room in accordance with Title 10 of the Code of Federal Regulations 2.390, Public Inspections, Exemptions, Requests for Withholding.
Sincerely, Robert E. Williams, Jr., Chief Projects Branch 1 Division of Operating Reactor Safety Docket Nos. 05000369 and 05000370 License Nos. NPF-9 and NPF-17
Enclosure:
As stated
Inspection Report
Docket Numbers:
05000369 and 05000370
License Numbers:
Report Numbers:
05000369/2024004 and 05000370/2024004
Enterprise Identifier:
I-2024-004-0020
Licensee:
Duke Energy Carolinas, LLC
Facility:
McGuire Nuclear Station
Location:
Huntersville, North Carolina
Inspection Dates:
October 01, 2024, to December 31, 2024
Inspectors:
C. Safouri, Senior Resident Inspector
F. Young, Resident Inspector
M. Kennard, Senior Operations Engineer
J. Walker, Senior Emergency Preparedness Inspector
Approved By:
Robert E. Williams, Jr., Chief
Projects Branch 1
Division of Operating Reactor Safety
SUMMARY
The U.S. Nuclear Regulatory Commission (NRC) continued monitoring the licensees performance by conducting an integrated inspection at McGuire Nuclear Station, in accordance with the Reactor Oversight Process. The Reactor Oversight Process is the NRCs program for overseeing the safe operation of commercial nuclear power reactors. Refer to https://www.nrc.gov/reactors/operating/oversight.html for more information.
List of Findings and Violations
No findings or violations of more than minor significance were identified.
Additional Tracking Items
None.
PLANT STATUS
Unit 1 operated at or near rated thermal power for the entire inspection period.
Unit 2 operated at or near rated thermal power for the entire inspection period.
INSPECTION SCOPES
Inspections were conducted using the appropriate portions of the inspection procedures (IPs) in effect at the beginning of the inspection unless otherwise noted. Currently approved IPs with their attached revision histories are located on the public website at http://www.nrc.gov/reading-rm/doc-collections/insp-manual/inspection-procedure/index.html. Samples were declared complete when the IP requirements most appropriate to the inspection activity were met consistent with Inspection Manual Chapter (IMC) 2515, Light-Water Reactor Inspection Program - Operations Phase. The inspectors performed activities described in IMC 2515, Appendix D, Plant Status, observed risk significant activities, and completed on-site portions of IPs. The inspectors reviewed selected procedures and records, observed activities, and interviewed personnel to assess licensee performance and compliance with Commission rules and regulations, license conditions, site procedures, and standards.
REACTOR SAFETY
71111.01 - Adverse Weather Protection
Seasonal Extreme Weather Sample (IP Section 03.01) (1 Sample)
- (1) The inspectors evaluated readiness for seasonal extreme weather conditions prior to the onset of seasonal cold temperatures for the following systems on November 12, 2024:
- Unit 1 and Unit 2 electrical heat trace system
- Unit 1 and Unit 2 diesel generator (D/G) building ventilation system
71111.04 - Equipment Alignment
Partial Walkdown Sample (IP Section 03.01) (2 Samples)
The inspectors evaluated system configurations during partial walkdowns of the following systems/trains:
- (1) Unit 2 train 'B' D/G, on October 25, 2024
- (2) Unit 2 train 'A' and 'B' main feedwater pump turbine hydraulic oil system, on November 4, 2024
71111.05 - Fire Protection
Fire Area Walkdown and Inspection Sample (IP Section 03.01) (4 Samples)
The inspectors evaluated the implementation of the fire protection program by conducting a walkdown and performing a review to verify program compliance, equipment functionality, material condition, and operational readiness of the following fire areas:
- (1) Unit 2 loop 'B' and loop 'C' main steam valve room, on October 23, 2024
- (2) Units 1 and 2 vital battery rooms, on November 7, 2024
- (3) Standby shutdown facility, on November 15, 2024
- (4) Auxiliary building Unit 1 mechanical penetration room, on December 18, 2024
71111.06 - Flood Protection Measures
Flooding Sample (IP Section 03.01) (1 Sample)
- (1) The inspectors evaluated internal flooding mitigation protections in the:
71111.11A - Licensed Operator Requalification Program and Licensed Operator Performance
Requalification Examination Results (IP Section 03.03) (1 Sample)
The licensee completed the annual requalification operating examinations and biennial written examinations required to be administered to all licensed operators in accordance with Title 10 of the Code of Federal Regulations 55.59(a)(2), "Requalification Requirements," of the NRC's "Operator's Licenses." The inspector performed an in-office review of the overall pass/fail results of the individual operating examinations, the crew simulator operating examinations, and the biennial written examinations in accordance with inspection procedure (IP) 71111.11, "Licensed Operator Requalification Program and Licensed Operator Performance." These results were compared to the thresholds established in Section 3.03, "Requalification Examination Results," of IP 71111.11.
- (1) The inspectors reviewed and evaluated the licensed operator examination failure rates for the requalification annual operating and the biennial written examinations completed on June 28, 2024.
71111.12 - Maintenance Effectiveness
Maintenance Effectiveness (IP Section 03.01) (2 Samples)
The inspectors evaluated the effectiveness of maintenance to ensure the following structures, systems, and components (SSCs) remain capable of performing their intended function:
- (1) Periodic 10 CFR 50.65(a)(3) evaluation review from January 1, 2021, through September 30, 2022, on October 18, 2024
- (2) Maintenance rule trend review associated with the annunciator, status, and monitor light system, on October 22, 2024
71111.13 - Maintenance Risk Assessments and Emergent Work Control
Risk Assessment and Management Sample (IP Section 03.01) (2 Samples)
The inspectors evaluated the accuracy and completeness of risk assessments for the following planned and emergent work activities to ensure configuration changes and appropriate work controls were addressed:
- (1) Emergent work on Unit 2 train 'A' main feedwater pump lubricating oil system water excursion, on November 3, 2024
- (2) Troubleshooting on Unit 2 train 'B' solid state protection system intermittent general warning alarm, on December 16, 2024
71111.15 - Operability Determinations and Functionality Assessments
Operability Determination or Functionality Assessment (IP Section 03.01) (3 Samples)
The inspectors evaluated the licensee's justifications and actions associated with the following operability determinations and functionality assessments:
- (1) Nuclear condition report (NCR) 02531748, Unit 1 turbine driven auxiliary feedwater pump oil leak from overspeed trip device, on October 23, 2024
- (2) NCR 02534019, Unit 2 power range upper detector N-44 drifting, on November 5, 2024
- (3) NCR 02536942, Unit 2 train 'A' motor driven auxiliary feedwater pump control panel sliding link will not close for valve 2CA-40B, on December 9, 2024
71111.18 - Plant Modifications
Temporary Modifications and/or Permanent Modifications (IP Section 03.01 and/or 03.02) (1 Sample)
The inspectors evaluated the following temporary or permanent modifications:
- (1) Work order 20692266, disabling of 2ATB transformer high pressure alarm, on November 18, 2024
71111.24 - Testing and Maintenance of Equipment Important to Risk
The inspectors evaluated the following testing and maintenance activities to verify system operability and/or functionality:
Post-Maintenance Testing (PMT) (IP Section 03.01) (4 Samples)
- (1) IP/2/A/3207/003P, "NIS Power Range N44 Drawer Calibration," following replacement of isolation amplifier NM301, on November 6, 2024
- (2) IP/2/A/3090/021LD, "LD Loop Calibration And Operational Test," for the calibration of Unit 2 train 'A' D/G lubrication oil filter differential pressure transmitter, on November 19, 2024
- (3) IP/0/A/3061/006E, "Vital Inverter Maintenance and Alignment," in conjunction with 1EVIB vital battery inverter calibration and preventive maintenance, on November 25, 2024
- (4) PT/2/A/4252/002B, "CA Valve Stroke Timing - Quarterly 2B Motor Driven Pump Flowpath," to retest Unit 2 train 'B' motor driven auxiliary feedwater pump suction valve 2CA-18B following preventive maintenance, on December 2, 2024
Surveillance Testing (IP Section 03.01) (2 Samples)
- (1) PT/2/A/4350/036B, "Diesel Generator 2B 24 Hour Run," on Unit 2 train 'B' D/G, on December 2, 2024
- (2) PT/1/A/4600/001, "Rod cluster control assembly (RCCA) Movement Test," on Unit 1, on December 16, 2024
71114.02 - Alert and Notification System Testing
Inspection Review (IP Section 02.01-02.04) (1 Sample)
- (1) The inspectors evaluated the maintenance and testing of the alert and notification system during the week of November 4, 2024.
71114.03 - Emergency Response Organization Staffing and Augmentation System
Inspection Review (IP Section 02.01-02.02) (1 Sample)
- (1) The inspectors evaluated the readiness of the emergency response organization during the week of November 4, 2024.
71114.04 - Emergency Action Level and Emergency Plan Changes
Inspection Review (IP Section 02.01-02.03) (1 Sample)
- (1) The inspectors evaluated submitted emergency action level, emergency plan, and emergency plan implementing procedure changes during the week of November 4, 2024. This evaluation does not constitute NRC approval.
71114.05 - Maintenance of Emergency Preparedness
Inspection Review (IP Section 02.01 - 02.11) (1 Sample)
- (1) The inspectors evaluated the maintenance of the emergency preparedness program during the week of November 4,
OTHER ACTIVITIES - BASELINE
===71151 - Performance Indicator Verification The inspectors verified licensee performance indicators submittals listed below:
EP01: Drill/Exercise Performance (DEP) Sample (IP Section 02.12)===
- (1) July 1, 2023, through June 30, 2024 EP02: Emergency Response Organization (ERO) Drill Participation (IP Section 02.13) (1 Sample)
- (1) July 1, 2023, through June 30, 2024 EP03: Alert And Notification System (ANS) Reliability Sample (IP Section 02.14) (1 Sample)
- (1) July 1, 2023, through June 30, 2024
71152A - Annual Follow-up Problem Identification and Resolution Annual Follow-up of Selected Issues (Section 03.03)
The inspectors reviewed the licensees implementation of its corrective action program related to the following issues:
- (1) NCR 02528446, Unit 2 polar crane cab heating, ventilation, and air conditioning (HVAC) aluminum content exceeds containment design limit, on October 8, 2024
- (2) NCR 02516070, lowering pressure trend identified in the waste gas system, on October 23, 2024
- (3) NCR 025229197, Unit 2 train 'A' D/G failed to meet acceptance criteria for time to 4160 volts, on November 21,
INSPECTION RESULTS
No findings were identified.
EXIT MEETINGS AND DEBRIEFS
The inspectors verified no proprietary information was retained or documented in this report.
- On November 7, 2024, the inspectors presented the emergency preparedness program inspection results to Edward Pigott and other members of the licensee staff.
- On January 15, 2025, the inspectors presented the integrated inspection results to Edward Pigott and other members of the licensee staff.
DOCUMENTS REVIEWED
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
Corrective Action
Documents
Nuclear Condition
Report(s)
2533845, 2530553
Corrective Action
Documents
Resulting from
Inspection
Nuclear Condition
Report(s)
2534678, 02534716, 02534811
Fire Plans
CSD-MNS-PFP-
IDH2-0767-001
U2 Interior Doghouse Elevation 767 Pre-Fire Plan
Corrective Action
Documents
Nuclear Condition
Report(s)
2518410
Work Orders
20694097
Procedures
AD-EG-ALL-1139
Temporary Configuration Changes
Corrective Action
Documents
Nuclear Condition
Report(s)
2534019
IP/0/A/3066/002D
Rotork Actuator Preventative Maintenance
IP/0/A/3066/013H
Testing Motor Operated Gate Diaphragm or Non-Kerotest
Globe Valves Using Teledyne Quiklook System
Procedures
PT/0/A/4150/041
RCCA Bank Repositioning
Work Orders
20694097, 20627712, 20448391
CSD-EP-MNS-
0101-01
EAL Technical Basis Document
Duke Energy Common Emergency Plan
Procedures
EP-MNS-EPLAN-
ANNEX
Duke Energy McGuire Emergency Plan Annex
20687528
Work Orders
Work Request(s)
275488