IR 05000277/2024001
| ML24131A031 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 05/13/2024 |
| From: | Jon Greives NRC/RGN-I/DORS |
| To: | Rhoades D Constellation Energy Generation, Constellation Nuclear |
| References | |
| IR 2024001 | |
| Download: ML24131A031 (1) | |
Text
May 13, 2024
SUBJECT:
PEACH BOTTOM ATOMIC POWER STATION, UNITS 2 AND 3 -
INTEGRATED INSPECTION REPORT 05000277/2024001 AND 05000278/2024001
Dear David Rhoades:
On March 31, 2024, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Peach Bottom Atomic Power Station, Units 2 and 3. On April 18, 2024, the NRC inspectors discussed the results of this inspection with David Henry, Site Vice President, 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, Jonathan E. Greives, Chief Projects Branch 4 Division of Operating Reactor Safety
Docket Nos. 05000277 and 05000278 License Nos. DPR-44 and DPR-56
Enclosure:
As stated
Inspection Report
Docket Numbers: 05000277 and 05000278
License Numbers: DPR-44 and DPR-56
Report Numbers: 05000277/2024001 and 05000278/2024001
Enterprise Identifier: I-2024-001- 0054
Licensee: Constellation Energy Generation, LLC
Facility: Peach Bottom Atomic Power Station, Units 2 and 3
Location: Delta, PA 17314
Inspection Dates: January 1, 2024 to March 31, 2024
Inspectors: S. Rutenkroger, Senior Resident Inspector C. Dukehart, Resident Inspector P. Cataldo, Senior Reactor Inspector S. Flanagan, Reactor Engineer L. Grimes, Senior Resident Inspector S. Haney, Senior Project Engineer J. Kepley, Operations Engineer J. Tifft, Reactor Inspector A. Ziedonis, Senior Resident Inspector
Approved By: Jonathan E. Greives, Chief Projects Branch 4 Division of Operating Reactor Safety
Enclosure
SUMMARY
The U.S. Nuclear Regulatory Commission (NRC) continued monitoring the licensees performance by conducting an integrated inspection at Peach Bottom Atomic Power Station,
Units 2 and 3, 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
Type Issue Number Title Report Section Status NOV 05000277,05000278/ Failure to Establish 71111.06 Closed 2023010- 01 Corrective Action for Erosion of Structural Backfill Material in the Pipe Trench
PLANT STATUS
Unit 2 began the inspection period at rated thermal power (RTP). On January 27, 2024, the unit was down powered to 68 percent for main condenser waterbox cleaning. The unit was returned to RTP the following day. On January 29, 2024, the unit automatically shutdown due to a main generator lockout caused by a failure of the Audio Tone trip system. The unit was restarted on January 30, 2024, synchronized to the grid on January 31, 2024, and returned to RTP on February 1, 2024. On March 8, 2024, the unit was down powered to 63 percent for a control rod pattern adjustment and returned to RTP the following day. The unit remained at or near RTP for the remainder of the inspection period.
Unit 3 began the inspection period at RTP. On March 1, 2024, the unit was down powered to 65 percent for a control rod pattern adjustment and main turbine valve testing and returned to RTP the following day. The unit remained at or near RTP for the remainder of the 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 (IP Section 03.01) (1 Sample)
- (1) The inspectors evaluated readiness for seasonal extreme weather conditions in the inner screenhouse, circulating water pump structure, emergency diesel generator (EDG) building, and outside areas on January 16, 2024
71111.04 - Equipment Alignment
Partial Walkdown (IP Section 03.01) (4 Samples)
The inspectors evaluated system configurations during partial walkdowns of the following systems/trains:
- (1) Unit 2, 2A core spray loop, on January 17 and 18, 2024
- (2) Unit 3, high-pressure coolant injection (HPCI) during reactor core isolation cooling (RCIC) maintenance, on February 7, 2024
- (3) Unit 2, residual heat removal (RHR) 'A' loop, on February 22, 2024
- (4) Unit 3, RCIC system, with the HPCI system out of service for planned maintenance, on March 4 and 5, 2024
71111.05 - Fire Protection
Fire Area Walkdown and Inspection (IP Section 03.01) (5 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, fire area PF-5H, reactor building general area focused on a fire breach permit associated with door 184, on February 5, 2024
- (2) Unit 2, multiple fire areas for degraded electrical cable, on February 12, 2024
- (3) Unit 3, fire area PF-117, emergency battery and switchgear rooms, on February 21, 2024
- (4) Unit 3, fire area PF-5J, reactor building general area, on February 29, 2024
- (5) Unit common, fire area PF-78H, cable spreading room, on March 6, 2024
Fire Brigade Drill Performance (IP Section 03.02) (1 Sample)
- (1) The inspectors evaluated the onsite fire brigade training and performance during an unannounced fire drill on February 21, 2024
71111.06 - Flood Protection Measures
Flooding (IP Section 03.01) (2 Samples)
- (1) The inspectors evaluated that flood protection barriers, mitigation plans, procedures, and equipment are consistent with the licensees design requirements and risk analysis assumptions for coping with external flooding on January 23, 2024. In addition, the inspectors reviewed Constellations response to Notice of Violation (NOV) 05000277,05000278/2023010-01, Failure to Establish Corrective Action for Erosion of Structural Backfill Material in the Pipe Trench, (ADAMS Accession No.
ML23286A001) and determined that the reason, corrective actions taken and planned to address recurrence, and the date when full compliance will be achieved for this violation is adequately addressed and captured on the docket.
- (2) The inspectors evaluated internal flooding mitigation protections in the high-pressure service water (HPSW) and emergency service water (ESW) pump rooms on January 24, 2024
71111.07A - Heat Exchanger/Sink Performance
Annual Review (IP Section 03.01) (1 Sample)
The inspectors evaluated readiness and performance of:
- (1) Unit common, 'E-4' EDG lubricating oil cooler (0DE377) and jacket water cooler (0DE376) heat exchangers inspection and cleaning on January 23, 2024
71111.11Q - Licensed Operator Requalification Program and Licensed Operator Performance
Licensed Operator Performance in the Actual Plant/Main Control Room (IP Section 03.01) (1 Sample)
- (1) The inspectors observed and evaluated licensed operator performance in the control room during the Unit 2 restart preparation, startup operations, and synchronization to the grid on January 30 and 31, 2024
Licensed Operator Requalification Training/Examinations (IP Section 03.02) (1 Sample)
- (1) The inspectors observed and evaluated licensed operator requalification training in the simulator on January 29, 2024
71111.12 - Maintenance Effectiveness
Maintenance Effectiveness (IP Section 03.01) (1 Sample)
The inspectors evaluated the effectiveness of maintenance to ensure the following structures, systems, and components (SSCs) remain capable of performing their intended function:
- (1) Unit 3, static inverter maintenance effectiveness following swap to alternate power supply during the week of February 26, 2024
Aging Management (IP Section 03.03) (1 Sample)
The inspectors evaluated the effectiveness of the aging management program for the following SSCs that did not meet their inspection or test acceptance criteria:
- (1) Unit 2, unsatisfactory VT-3 exam of HPSW system pipe hanger on July 5, 2023
71111.13 - Maintenance Risk Assessments and Emergent Work Control
Risk Assessment and Management (IP Section 03.01) (4 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) Unit 2, HPCI system planned maintenance on January 11, 2024
- (2) Unit 2, 2A RHR loop planned maintenance on January 17 and 18, 2024
- (3) Unit 3, HPCI system unavailable for planned maintenance on March 4 and 5, 2024
71111.15 - Operability Determinations and Functionality Assessments
Operability Determination or Functionality Assessment (IP Section 03.01) (4 Samples)
The inspectors evaluated the licensee's justifications and actions associated with the following operability determinations and functionality assessments:
- (1) Unit common, E-4 EDG lube oil cooler gasket was not seated properly with some tearing on January 23, 2024
- (3) Unit 3, HPCI system electro-hydraulic governor module and ramp generator signal converter calibration on March 5 and 6, 2024
71111.20 - Refueling and Other Outage Activities
Refueling/Other Outage (IP Section 03.01) (1 Sample)
- (1) The inspectors evaluated activities associated with an unplanned Unit 2 outage, including Mode 2 through reactor criticality on January 30, 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) (5 Samples)
- (1) Unit common, E-4 EDG planned maintenance, on January 22 through 26, 2024
- (2) Unit 2, G wide range neutron monitor following maintenance to restore display operation, on January 30, 2024
- (3) Unit 3, RCIC system planned maintenance, on February 7, 2024
- (4) Unit common, 'E-2' EDG jacket cooler temperature switch replacement, on February 9, 2024
- (5) Unit 2, '2C' core spray pump electrical testing, on February 12, 2024
Surveillance Testing (IP Section 03.01) (1 Sample)
- (1) Unit 2, 'E-3' EDG simulated Unit 2 emergency core cooling system signal auto start testing performed, on February 14, 2024
Inservice Testing (IST) (IP Section 03.01) (2 Samples)
- (1) Unit 3, HPCI pump, valve and flow and inservice comprehensive test, on March 6 and 7, 2024
- (2) Unit 2, '2A' loop RHR pump, valve and flow and inservice test, on March 26, 2024
71114.06 - Drill Evaluation
Required Emergency Preparedness Drill (1 Sample)
- (1) The inspectors observed a full scope hostile action-based scenario training activity on February 6,
OTHER ACTIVITIES - BASELINE
===71151 - Performance Indicator Verification
The inspectors verified licensee performance indicators submittals listed below:
IE01: Unplanned Scrams per 7000 Critical Hours (IP Section 02.01)===
The inspectors verified licensee performance indicators submittals listed below:
- (1) Unit 2 for the period January 1, 2023, through December 31, 2023
- (2) Unit 3 for the period January 1, 2023, through December 31, 2023
IE03: Unplanned Power Changes per 7000 Critical Hours (IP Section 02.02) (2 Samples)
The inspectors verified licensee performance indicators submittals listed below:
- (1) Unit 2 for the period January 1, 2023, through December 31, 2023
- (2) Unit 3 for the period January 1, 2023, through December 31, 2023
IE04: Unplanned Scrams with Complications (USwC) (IP Section 02.03) (2 Samples)
The inspectors verified licensee performance indicators submittals listed below:
- (1) Unit 2 for the period January 1, 2023, through December 31, 2023
- (2) Unit 3 for the period January 1, 2023, through December 31, 2023
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) Unit 3 HPSW recurrent leaks, associated operability assessments, and alternative treatment evaluations
71153 - Follow-up of Events and Notices of Enforcement Discretion Personnel Performance (IP Section 03.03)
- (1) The inspectors evaluated the Unit 2, unplanned scram on January 29,
INSPECTION RESULTS
No findings were identified.
EXIT MEETINGS AND DEBRIEFS
The inspectors verified no proprietary information was retained or documented in this report.
- On April 18, 2024, the inspectors presented the integrated inspection results to David Henry, Site Vice President, and other members of the licensee staff.
DOCUMENTS REVIEWED
Inspection Type Designation Description or Title Revision or
Procedure Date
71111.04 Corrective Action Condition Reports
Documents Issue Reports
04748058
04747941
04740624
71111.04 Drawings 6280-M-361 Revision 88
71111.05 Miscellaneous PIMS AR1452560
71111.05 Procedures CC-PB-201
71111.05 Procedures Impairment
19442
71111.05 Procedures PF-117 Unit 3 Turbine Building, Emergency Battery Switchgear Revision 11
Rooms-Elevation 135'-0"
71111.05 Procedures PF-93 Pre-Fire Plan Fire Area/Zone 50/93, 94, 95 Revision 4
71111.06 Calculations PM-1048 Design Basis for Internal Flood Protection for the Revision 2
HPSW/ESW Pump Structure
71111.06 Corrective Action AR 04696285
Documents
71111.06 Corrective Action AR 04736649
Documents
Resulting from
Inspection
71111.06 Procedures ARC-004 'A' ESW Pump Room Flooded Revision 9
00C226C A-3
71111.06 Procedures ARC-004 'B' ESW Pump Room Flooded Revision 9
00C226C A-4
71111.06 Procedures CC-PB-201 Hazard Barrier Control Program Revision 14
71111.06 Procedures OP-PB-102-106 Operator Response Time Program at Peach Bottom Revision 11
71111.06 Procedures P-T-09 Internal Hazards Revision 11
71111.07A Work Orders 05323572
71111.07A Work Orders 05323575
71111.12 Corrective Action 04688775
Documents
Inspection Type Designation Description or Title Revision or
Procedure Date
71111.12 Work Orders 05355581
71111.15 Corrective Action IR 04734840
Documents
71111.15 Corrective Action IR 04739399
Documents
71111.20 Miscellaneous Just in Time
Training Rapid
Deployment - tq-
aa-224-f310 for
Peach Bottom
P2F11
eSOMS
Clearance - 22-2-
07-0003
71111.24 Drawings 6280-M-361, P&I Diagram Residual Heat Removal System Revision 88
Sheet 1
71111.24 Procedures ST-O-010-301-2 'A' RHR Loop Pump, Valve Flow and Unit Cooler Functional Revision 55
and Inservice Test
71111.24 Procedures ST-O-052-153-2 E3 D/G Simulated Unit 2 ECCS Signal Auto Start With Off-Revision 20
Site Power Available And Full Load Test
71111.24 Work Orders 04675063
71111.24 Work Orders 04909229 Replace RMS-3-13A-S024-EQ PM
04909225 Replace RMS-3-13A-S017-EQ PM
71111.24 Work Orders 5280102
71152A Corrective Action IR 04699907
Documents
71152A Corrective Action IR 04711158
Documents
71152A Corrective Action IR 04714455
Documents
71152A Corrective Action IR 04718294
Documents
71152A Engineering 640060 Min Wall Repair of 18" HPSW Pipe in Off Gas Pipe Tunnel Revision 1
Changes U3 A/C Supply to RHR Heat Exchanger
71152A Engineering 640091 RISC-3 50.69 Evaluation - HPSW Pinhole Leak in Off-Gas Revision 1
Inspection Type Designation Description or Title Revision or
Procedure Date
Changes Pipe Tunnel
71152A Work Orders 05410266
71153 Corrective Action IR 04738575
Documents
11