IR 05000461/2025001
| ML25125A294 | |
| Person / Time | |
|---|---|
| Site: | Clinton  (NPF-062) |
| Issue date: | 05/05/2025 |
| From: | Robert Ruiz NRC/RGN-III/DORS/RPB1 |
| To: | Rhoades D Constellation Energy Generation |
| References | |
| IR 2025001 | |
| Download: ML25125A294 (1) | |
Text
SUBJECT:
CLINTON POWER STATION - INTEGRATED INSPECTION REPORT 05000461/2025001
Dear David Rhoades:
On March 31, 2025, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Clinton Power Station. On April 17, 2025, the NRC inspectors discussed the results of this inspection with Andy Krukowski 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 Ruiz, Chief Reactor Projects Branch 1 Division of Operating Reactor Safety Docket No. 05000461 License No. NPF-62
Enclosure:
As stated
Inspection Report
Docket Number:
05000461
License Number:
Report Number:
Enterprise Identifier:
I-2025-001-0063
Licensee:
Constellation Nuclear
Facility:
Clinton Power Station
Location:
Clinton, IL
Inspection Dates:
January 01, 2025, to March 31, 2025
Inspectors:
T. Hartman, Senior Project Engineer
A. Muneeruddin, Senior Resident Inspector
J. Murphy, Illinois Emergency Management Agency
J. Steward, Senior Resident Inspector
Approved By:
Robert Ruiz, Chief
Reactor 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 Clinton Power 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 began the inspection period at rated thermal power (RTP). On March 8, 2025, Unit 1 lowered reactor power to 72 percent RTP to perform a planned control rod sequence exchange, and settle testing on two control rods, 52-21 and 04-37. Following completion of the sequence exchange and settle testing on March 9, 2025, the unit was returned to RTP and continued to operate 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
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, specifically a cold weather alert with significant amount of snow greater than 5 inches on January 3, 2025.
71111.04 - Equipment Alignment
Partial Walkdown Sample (IP Section 03.01) (3 Samples)
The inspectors evaluated system configurations during partial walkdowns of the following systems/trains:
(1)standby liquid control train B on March 18, 2025 (2)residual heat removal train A on March 20, 2025 (3)division 2 battery and direct current distribution system on March 31, 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) Fire Areas D-4(a) and D 4(b); division 3 diesel generator and day tank room on January 29, 2025
- (2) Fire Areas 737' service building grade floor and 722' service building basement on February 3, 2025
- (3) Fire Area A-3(f) 781' - 790' auxiliary building division 2 switchgear on March 18, 2025
- (4) Fire Area A-2(h); 737' auxiliary building east outside of reactor water cleanup pump (RWCU) B room on March 18, 2025
- (5) Fire Area A-2(b); residual heat removal train A pump and heat exchanger room on March 20, 2025
Fire Brigade Drill Performance Sample (IP Section 03.02) (1 Sample)
- (1) The inspectors evaluated the onsite fire brigade training and performance during an announced fire drill outside the RWCU B Pump Room, 737' auxiliary building east on March 18, 2025.
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 a planned downpower to 72 percent RTP for rod settle testing on control rods 04-37 and 52-21, and a control rod sequence exchange on March 8, 2025.
Licensed Operator Requalification Training/Examinations (IP Section 03.02) (1 Sample)
- (1) The inspectors observed and evaluated licensed operator requalification training performance in the simulator on February 4, 2025.
71111.13 - Maintenance Risk Assessments and Emergent Work Control
Risk Assessment and Management Sample (IP Section 03.01) (1 Sample)
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)elevated risk (action green) associated with invoking risk informed completion time (RICT) for the failure of division 4 main steam line pressure low instrument atm, 1B21-N676D, during a division 3 system outage work week, per action request (AR) 4841842 on March 4, 2025
71111.15 - Operability Determinations and Functionality Assessments
Operability Determination or Functionality Assessment (IP Section 03.01) (6 Samples)
The inspectors evaluated the licensees justifications and actions associated with the following operability determinations and functionality assessments:
(1)loss of the continuous containment exhaust ventilation system due to a configuration control event per AR 4829091 on January 17, 2025 (2)unexpected trip of residual heat removal (RHR) pump B and RHR C waterleg pump per AR 4832418 on January 28, 2025 (3)division 1 diesel generator 12-cylinder engine failed to trip from the 16-cylinder engine per AR 04836219 on February 14, 2025 (4)unexpected main control room annunciator for low steam line pressure per AR 04841842 on March 6, 2025 (5)standby liquid control A pump gearbox low level per ARs 4846842 and 4847101 on March 27, 2025 (6)345 KV and 138 KV bus voltage spikes and resultant impact on offsite power source operability per AR 4841480 on March 27, 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 (PMT) (IP Section 03.01) (9 Samples)
(1)suppression pool cleanup pump A corrective maintenance and return to service testing per work order (WO) 5587356 tasks 01, 02 and 05 on January 14, 2025 (2)replacement and testing of the 1WX020 handswitch, RWCU backwash outboard isolation valve hand switch following failure per WO 5615967-06, on January 30, 2025 (3)overspeed trip test of division 1 diesel generator, 12-cylinder and 16-cylinder engines following adjustment of the overspeed mechanism spring adjustment per WO 05351114, on February 13, 2025 (4)remote shutdown panel 24 vdc inverter 1C61-K002 replacement following failure and post-maintenance test per WO 5627633 tasks, 01, 02 and 03 on March 5, 2025 (5)division 3 diesel generator governor control switch replacement and post-maintenance test per WO 05546925-01, on March 7, 2025 (6)post-maintenance test of fuel pool cooling and cleanup supply inside containment isolation valve, 1FC037 following thrust verification and motor operated valve clean and inspect per WO 05095397-04, on March 11, 2025 (7)high pressure core spray waterleg pump, 1E22-C003 post-maintenance testing following sampling and replacement of pump oil per WO 5557291-02, on March 24, 2025 (8)control room ventilation train B per WOs 5374901 and 5150307, on March 27, 2025 (9)control room chiller train B per WOs 5160391-03, 5195326-02, 5554803-03 and
5375841-02, on March 31, 2025 Surveillance Testing (IP Section 03.01)
- (1) B primary containment recombiner and valve operability test per WO 05388725-01 and CPS 9068.03, on February 18, 2025
Inservice Testing (IST) (IP Section 03.01) (1 Sample)
- (1) RHR B & C waterleg pump inservice testing of a new waterleg pump per CPS 9058.02, following unexpected failure of the original waterleg pump on February 6, 2025
Diverse and Flexible Coping Strategies (FLEX) Testing (IP Section 03.02) (1 Sample)
(1)semiannual functional testing (unloaded) and annual performance testing (loaded) of FLEX diesel generator 2, 1FX01KB, per WOs 05602483 and 05604614, on February 12, 2025
71114.06 - Drill Evaluation
Additional Drill and/or Training Evolution (1 Sample)
The inspectors evaluated:
- (1) field monitoring team annual training on March 13,
OTHER ACTIVITIES - BASELINE
===71151 - Performance Indicator Verification The inspectors verified licensee performance indicators submittals listed below:
IE01: Unplanned Scrams per 7000 Critical Hours Sample (IP Section 02.01)===
(1)
- (1) Unit 1 (January 1, 2024, through December 31, 2024)
IE03: Unplanned Power Changes per 7000 Critical Hours Sample (IP Section 02.02) (1 Sample)
(1)
- (1) Unit 1 (January 1, 2024, through December 31, 2024)
IE04: Unplanned Scrams with Complications (USwC) Sample (IP Section 02.03) (1 Sample)
(1)
- (1) Unit 1 (January 1, 2024, through December 31, 2024)
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 17, 2025, the inspectors presented the integrated inspection results to A. Krukowski and other members of the licensee staff.
DOCUMENTS REVIEWED
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
E02-1DC06 sheet
25 VDC & Uninterruptible Power Supply Systems
AE
E02-1DC99 sheet
25V DC MCC & Distribution Panel 1B Alarms &
Instrumentation
AK
M05-1075 sheet 1
AZ
M05-1075 sheet 4
AG
Drawings
M05-1077 sheet
001
3312.01
3312.01E001
Residual Heat Removal Electrical Lineup
3312.01V001
Residual Heat Removal Valve Lineup
17d
3314.01
3314.01E001
Standby Liquid Control Electrical Lineup
3314.01V001
Standby Liquid Control Valve Lineup
10b
3503.01
Battery and DC Distribution
Procedures
3503.01E001
Battery and DC Distribution Electrical Lineup
1893.04M102
707-781 Auxiliary: RHR A Pump and Heat Exchanger
Room Prefire Plan
1893.04M113
737 Auxiliary: RWCU Pump B Room Prefire Plan
5a
1893.04M130
Div 2 Swichgear Prefire Plan
5b
1893.04M510
737 Diesel Generator: Div 3 Diesel Generator & Day Tank
Room Prefire Plan
6c
1893.04M810
2 Service Building: Basement Prefire Plan
2c
Fire Plans
1893.04M811
737 Service Building: Ground Level Prefire Plan
2a
Miscellaneous
25-04
Fire Drill Scenario Information
03/18/2025
Procedures
Fire Drill Performance
Miscellaneous
212.01F003
Control Rod Settle Record
3005.01
Unit Power Changes
3304.01
Control Rod Hydraulic and Control
3304.02
Rod Control and Information System
23d
Procedures
ESG-LOR-005
Clinton Power Station Licensed Operator Training Simulator
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
Exercise Guide (OBE 5)
Control Rod Sequence Package Preparation, Review,
Revision, and Implementation
Miscellaneous
PRA CL 122A
Paragon RICT Report
03/03/2025
ER-CL-600-2001
Clinton RICT System Guidelines
Procedures
Risk Informed Completion Time
4844324,
4848108,
4848401,
4848398,
4847904
Various Issue Reports Written Against the Condition
03/27/2025
Corrective Action
Documents
ARs 4836501,
4836506, and
4836549
Various Issue Reports Written Against the Condition
2/14/2025
Engineering
Changes
29951
Engineering Change Notice of Division I, II, and III
Diesel Engine Overspeed Trip Range
2/05/1996
466341
Division 1 DG Overspeed Trip Test Evaluation
03/06/2025
Engineering
Evaluations
466673
Support Change to Expand 9082.01 Tap 2 Operating Range
03/27/2025
1005.09
EOP/Off-Normal Performance Aid Matrix
9e
Electronic Shift Operations Management System
Narrative Logs
03/24/2025
Electronic Shift Operations Management System
Narrative Logs
01/28/2025
TS
Clinton Technical Specifications
01/28/2025
Miscellaneous
Clinton Updated Final Safety Analysis Report
01/28/2025
5065.05
Alarm Panel 5065 Annunciators - Row 5
34e
5067.02
Alarm Panel 5067 Annunciators - Row 2
Procedures
9082.01
Offsite Source Power Verification
2c
9058.02
RCIC/ECCS Water Leg Pump Comprehensive Testing
9061.01
Fuel Pool Cooling Valve Operability
48e
9068.03
Primary Containment Recombiner and Valve Operability
Test
Procedures
9080.03
Diesel Generator 1C Operability - Manual and Quick Start
Operability
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
9080.31
Diesel Generator Individual Engine Overspeed Trip Test and
Adjustment
4c
Work Orders
Flex - 1FX01KB DG Functional
2/18/2025
EP-AA-112-500-
F-06
Transfer of Radiological Samples to Radiological
Laboratories
D
EP-AA-112-F-05
Environmental Sample Collection Guidelines
D
Miscellaneous
N-AN-EP-G-10a
Field Team Dispatch and Control for NON-RP Personnel
Procedures
EP-AA-112-500-
F-01
Field Monitoring Team Checklist
J
Miscellaneous
Regulatory Assessment Performance Indicator Guideline
71151
Procedures
71151
Performance Indicator Verification
01/01/2025