IR 05000443/2025004
| ML26029A168 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 01/29/2026 |
| From: | Glenn Dentel Division of Operating Reactors |
| To: | Coffey B NextEra Energy Seabrook, NextEra Energy |
| References | |
| IR 2025004 | |
| Download: ML26029A168 (0) | |
Text
January 29, 2026
SUBJECT:
SEABROOK STATION - INTEGRATED INSPECTION REPORT 05000443/2025004
Dear Bob Coffey:
On December 31, 2025, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Seabrook Station. On January 15, 2026, the NRC inspectors discussed the results of this inspection with Christina Sheridan, 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 (10 CFR) 2.390, Public Inspections, Exemptions, Requests for Withholding.
Sincerely, Glenn T. Dentel, Acting Chief Projects Branch 2 Division of Operating Reactor Safety
Docket No. 05000443 License No. NPF-86
Enclosure:
As stated
Inspection Report
Docket Number:
05000443
License Number:
Report Number:
Enterprise Identifier: I-2025-004-0047
Licensee:
NextEra Energy Seabrook, LLC
Facility:
Seabrook Station
Location:
Seabrook, New Hampshire
Inspection Dates:
October 1, 2025 to December 31, 2025
Inspectors:
T. Daun, Senior Resident Inspector
S. Flanagan, Resident Inspector
R. Chan, Operations Engineer
N. Eckhoff, Health Physicist
C. Henckel, Operations Engineer
J. Morgan, Senior Operations Engineer
T. Setzer, Senior Operations Engineer
Approved By:
Glenn T. Dentel, Acting Chief
Projects Branch 2
Division of Operating Reactor Safety
SUMMARY
The U.S. Nuclear Regulatory Commission (NRC) continued monitoring the licensees performance by conducting an integrated inspection at Seabrook 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
Seabrook Station began the inspection period operating at 100 percent rated thermal power and remained at, or near, full power for 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 2515, Light-Water Reactor Inspection Program - Operations Phase. The inspectors performed activities described in Inspection Manual Chapter 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
Impending Severe Weather Sample (IP Section 03.02) (1 Sample)
- (1) The inspectors evaluated the adequacy of the overall preparations to protect risk significant systems from impending severe weather prior to anticipated heavy snowfall on December 2, 2025.
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) Charging system following 'B' charging pump surveillance on October 30, 2025
- (2) Supplemental emergency power supply system during 'A' emergency diesel generator maintenance on November 18, 2025
71111.05 - Fire Protection
Fire Area Walkdown and Inspection Sample (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)
'A' essential switchgear (CB-F-1A-A) on October 28, 2025
- (2) Charging pump rooms (PAB-F-1C-A, PAB-1D-A, PAB-F-1E-A) on October 30, 2025
- (3) Boric acid tank room (PAB-F-2B-Z) on October 30, 2025
- (4) Intake structure (IS-F-1-0) on December 20, 2025
- (5) Discharge structure (DS-F-1-0) on December 20, 2025
71111.11A - Licensed Operator Requalification Program and Licensed Operator Performance
Requalification Examination Results (IP Section 03.03) (1 Sample)
- (1) The inspectors reviewed and evaluated the licensed operator examination failure rates for the requalification annual operating exam administered on December 16, 2025, and the biennial written examination administered on December 17, 2025.
71111.11B - Licensed Operator Requalification Program and Licensed Operator Performance
Licensed Operator Requalification Program (IP Section 03.04) (1 Sample)
- (1) Biennial Requalification Written Examinations The inspectors evaluated the quality of the licensed operator biennial requalification written examination administered on December 17, 2025.
Annual Requalification Operating Tests The inspectors evaluated the adequacy of the facility licensees annual requalification operating test.
Administration of an Annual Requalification Operating Test The inspectors evaluated the effectiveness of the facility licensee in administering requalification operating tests required by Title 10 of the Code of Federal Regulations (10 CFR) 55.59(a)(2) and that the facility licensee is effectively evaluating their licensed operators for mastery of training objectives.
Requalification Examination Security The inspectors evaluated the ability of the facility licensee to safeguard examination material, such that the examination is not compromised.
Remedial Training and Re-examinations The inspectors evaluated the effectiveness of remedial training conducted by the licensee and reviewed the adequacy of re-examinations for licensed operators who did not pass the required requalification examination.
Operator License Conditions The inspectors evaluated the licensees program for ensuring that licensed operators meet the conditions of their licenses.
Control Room Simulator The inspectors evaluated the adequacy of the facility licensees control room simulator in modeling the actual plant, and for meeting the requirements contained in 10 CFR 55.46.
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 routine operability surveillance of control rods and 'B' emergency diesel generator surveillance on December 3, 2025, and December 11, 2025.
Licensed Operator Requalification Training/Examinations (IP Section 03.02) (1 Sample)
- (1) The inspectors observed and evaluated licensed operator annual requalification exams conducted in the plant reference simulator on November 10, 2025.
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 remain capable of performing their intended function:
- (1) Service water piping corrosion and through-wall leak on October 31, 2025
71111.13 - Maintenance Risk Assessments and Emergent Work Control
Risk Assessment and Management Sample (IP Section 03.01) (3 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) Guarded equipment during emergent 'B' emergency diesel generator maintenance on October 2, 2025
- (2) Guarded equipment during emergent 'A' emergency diesel generator maintenance on November 18, 2025
- (3) Guarded equipment during emergent cooling tower service water diving activities on December 12, 2025
71111.15 - Operability Determinations and Functionality Assessments
Operability Determination or Functionality Assessment (IP Section 03.01) (5 Samples)
The inspectors evaluated the licensee's justifications and actions associated with the following operability determinations and functionality assessments:
(1)
'B' charging pump outboard pump seal leak on October 1, 2025
- (2) Service water leak on discharge header on October 2, 2025
- (3) Pressurizer 'A' power operated relief valve dual light indication on October 8, 2025
- (4) Diverse and flexible coping strategies 405-kilowatt diesel generator on November 3, 2025 (5)
'B' emergency diesel generator following unexpected start of backup auxiliary coolant pump during engine start on November 4, 2025
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) Service water pipe patch and code repair on October 9, 2025
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 (IP Section 03.01) (4 Samples)
(1)
'B' emergency diesel generator retest following unexpected start of auxiliary coolant pump on October 2, 2025 (2)
'A' residual heat removal following motor inspection and valve maintenance on October 14, 2025 (3)
'A' emergency diesel generator following heat exchanger repair and lube oil heater replacement on November 25, 2025
- (4) Diverse and flexible coping strategies 405-kilowatt diesel generator following oil temperature switch on December 11, 2025
Inservice Testing (IP Section 03.01) (1 Sample)
(1) 'A' charging pump surveillance on December 17, 2025
71114.06 - Drill Evaluation
Additional Drill and/or Training Evolution (IP Section 03.02) (1 Sample)
The inspectors evaluated:
- (1) Licensed operators conducting notification exercises in the plant refence simulator on November 20,
2025 RADIATION SAFETY
71124.05 - Radiation Monitoring Instrumentation
Walkdowns and Observations (IP Section 03.01) (5 Samples)
The inspectors evaluated the following radiation detection instrumentation during plant walkdowns:
- (1) Ludlum Model 177 S/N 295986 hot tool crib
- (2) Ludlum Model 177 S/N 295943 waste process building
- (3) Mirion Tele-pole S/N 6607-017 admin building
- (4) High range area monitor S/N 1-rm-rm-6508 primary access building
- (5) Radiation area monitor S/N 1-RM-RM-6552 waste process building
Calibration and Testing Program (IP Section 03.02) (10 Samples)
The inspectors evaluated the calibration and testing of the following radiation detection instruments:
- (1) Eberline RM-14 S/N 7657
- (2) Eberline E-140N S/N 2002
- (3) Thermo Scientific RO-20 S/N 1643
- (4) Fluke 451B S/N 0058
- (5) Mirion Tele-pole S/N 6611-158
- (6) Fluke 451 S/N 1702
- (7) Mirion AMP-100 S/N 5014-031
- (8) Canberra GEM-5 Gamma Exit Monitor S/N 29829
- (9) Thermo Scientific SAM12 S/N 199
- (10) Mirion Fastscan Dosimetry office
Effluent Monitoring Calibration and Testing Program Sample (IP Section 03.03) (2 Samples)
The inspectors evaluated the calibration and maintenance of the following radioactive effluent monitoring and measurement instrumentation:
- (1) R-6528 Plant vent wide range gas radiation monitor
- (2) R-6519 steam generator blow down flash tank discharge radiation monitor
OTHER ACTIVITIES - BASELINE
71151 - Performance Indicator Verification The inspectors verified licensee performance indicators submittals listed below:
BI01: Reactor Coolant System Specific Activity Sample (IP Section 02.10) (1 Sample)
- (1) For the period October 1, 2024 through September 30, 2025
BI02: Reactor Coolant System Leak Rate Sample (IP Section 02.11) (1 Sample)
- (1) For the period October 1, 2024 through September 30, 2025
OR01: Occupational Exposure Control Effectiveness Sample (IP Section 02.15) (1 Sample)
- (1) For the period October 1, 2024 through September 30, 2025 PR01: Radiological Effluent Technical Specifications/Offsite Dose Calculation Manual
Radiological Effluent Occurrences Sample (IP Section 02.16) (1 Sample)
- (1) For the period October 1, 2024 through September 30, 2025 71152S - Semiannual Trend Problem Identification and Resolution
Semiannual Trend Review (IP Section 03.02) (1 Sample)
- (1) The inspectors reviewed the licensees corrective action program to identify potential trends that might be indicative of a more significant safety issue.
OTHER ACTIVITIES
- TEMPORARY INSTRUCTIONS, INFREQUENT AND ABNORMAL
92709 - Licensee Strike Contingency Plans
Licensee Strike Contingency Plans (1 Partial Sample)
- (1) In preparation for a potential union contract expiration, NRC inspectors evaluated the adequacy of the licensees contingency plan. The evaluation focused on staffing levels, staff qualifications, the safety-conscious work environment, and site access to ensure operational and security requirements could be met. This inspection procedure was only partially completed because an agreement was reached between the union and the licensee prior to its completion. No further review of these contingency plans is required, as the entry conditions for IP 92709 are no longer met.
INSPECTION RESULTS
Observation: Semi Annual Trend Review 71152S The inspectors evaluated Seabrook Stations corrective action program to identify trends that could indicate more significant safety concerns. This review included condition reports, assessments, system health reports, and corrective action program evaluation documents for the third and fourth quarters of 2025.
The inspectors identified an adverse trend in engineering rigor and operational decision-making. Specifically:
1. A non-conservative operability determination (Agencywide Documents Access
Management System (ADAMS) Accession No. ML25342A001) for nuclear instrumentation failed to recognize safety-related interactions.
2. Flaw characterization was delayed following identification of a through-wall leak on a
safety-related service water system.
These examples reflect weaknesses in problem identification and resolution, particularly in evaluation and corrective action success criteria.
EXIT MEETINGS AND DEBRIEFS
The inspectors verified that no proprietary information was retained or documented in this report.
- On January 15, 2026, the inspectors presented the integrated inspection results to Christina Sheridan, Site Vice President, and other members of the licensee staff.
DOCUMENTS REVIEWED
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
Procedures
Seasonal Readiness
Revision 43
OS1090.09
Station Cold Weather Operations
Revision 6
OS1200.03
Sever Weather Conditions
Revision 32
Drawings
PID-1-CS-
B20725
Chemical and Volume Control Charging System Detail
Revision 33
PID-1-CS-
B20729
Chemical and Volume Control System Boric Acid Detail
Revision 21
Work Orders
41028751
41035001
71111.11Q Procedures
OX1410.02
Rod Operability Surveillance
Revision 32
Corrective Action
Documents
2525143
Drawings
PID-1-SW-
D20795
Service Water System
Revision 58
Procedures
ES1807.012
Ultrasonic Thickness Measurements
Revision 8
Work Orders
41033681
Corrective Action
Documents
2530141
Procedures
Guarded Equipment
Revision 46
Work Orders
41028751
41035001
41036567
Corrective Action
Documents
2327060
2379730
2388047
2524690
2524960
2524963
2525143
2525162
2527623
Drawings
1-SW-O20795
Service Water Nuclear Detail
Revision 5
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
Work Orders
260904
40365254
40519520
40760327
40762261
Calculations
C-S-1-45886-
CALC
Service Water Return Piping from CC-E-17-A and B
Qualification
Revision 007
Corrective Action
Documents
2525143
2525759
Drawings
1-SW-D20795
Service Water System Nuclear Detail
Revision 56
Engineering
Changes
301048
SW-1814-005 Pipe Welded Pressure Pad
Revision 2
Work Orders
41032901
41033681
Corrective Action
Documents
2524960
2524963
2527623
2527623
2529737
Procedures
OS1026.09
Operation of DG 1B
Revision 38
OX1456.01
Charging Pump A & B Quarterly Flow and Valve Stroke Test
Revision 34
Work Orders
40894546
40998009
41009932
41032630
Miscellaneous
CFD 24-01
Seabrook Emergency Preparedness
01/31/2024
Procedures
EPDP-03
Emergency Preparedness Performance Indicators
Revision 27
Corrective Action
Documents
2379730
2388047
2516542
2517017
2525143