ML25125A294
| ML25125A294 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| 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
David Rhoades Senior Vice President Constellation Energy Generation, LLC President and Chief Nuclear Officer (CNO)
Constellation Nuclear 4300 Winfield Road Warrenville, IL 60555
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 cc w/ encl: Distribution via LISTSERV May 5, 2025 Signed by Ruiz, Robert on 05/05/25
Letter to David Rhoades from Robert Ruiz dated May 05, 2025.
SUBJECT:
CLINTON POWER STATION - INTEGRATED INSPECTION REPORT 05000461/2025001 DISTRIBUTION:
Tim Steadham RidsNrrDorlLpl3 RidsNrrPMClinton Resource RidsNrrDroIrib Resource Jack Giessner Mohammed Shuaibi Diana Betancourt-Roldan Bryan Bergeon David Curtis Jared Heck R3-DORS ADAMS Accession Number: ML25125A294
SUNSI Review
Non-Sensitive
Sensitive
Publicly Available
Non-Publicly Available OFFICE RIII RIII NAME NShah:anm RRuiz DATE 05/05/2025 05/05/2025 OFFICIAL RECORD COPY
Enclosure U.S. NUCLEAR REGULATORY COMMISSION Inspection Report Docket Number:
05000461 License Number:
NPF-62 Report Number:
05000461/2025001 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
2
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.
3 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
4 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
5 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
6 Surveillance Testing (IP Section 03.01) (1 Sample)
(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, 2025 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 Sample)
(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)
7 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.
8 DOCUMENTS REVIEWED Inspection Procedure Type Designation Description or Title Revision or Date E02-1DC06 sheet 1
125 VDC & Uninterruptible Power Supply Systems AE E02-1DC99 sheet 2
125V DC MCC & Distribution Panel 1B Alarms &
Instrumentation AK M05-1075 sheet 1 Residual Heat Removal AZ M05-1075 sheet 4 Residual Heat Removal AG Drawings M05-1077 sheet 001 Standby Liquid Control AC 3312.01 Residual Heat Removal 48 3312.01E001 Residual Heat Removal Electrical Lineup 17 3312.01V001 Residual Heat Removal Valve Lineup 17d 3314.01 Standby Liquid Control 13 3314.01E001 Standby Liquid Control Electrical Lineup 10 3314.01V001 Standby Liquid Control Valve Lineup 10b 3503.01 Battery and DC Distribution 20 71111.04 Procedures 3503.01E001 Battery and DC Distribution Electrical Lineup 15 1893.04M102 707-781 Auxiliary: RHR A Pump and Heat Exchanger Room Prefire Plan 6
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 722 Service Building: Basement Prefire Plan 2c Fire Plans 1893.04M811 737 Service Building: Ground Level Prefire Plan 2a Miscellaneous 2025-04 Fire Drill Scenario Information 03/18/2025 71111.05 Procedures OP-AA-201-003 Fire Drill Performance 22 Miscellaneous 2212.01F003 Control Rod Settle Record 1
3005.01 Unit Power Changes 55 3304.01 Control Rod Hydraulic and Control 42 3304.02 Rod Control and Information System 23d 71111.11Q Procedures ESG-LOR-005 Clinton Power Station Licensed Operator Training Simulator 0
9 Inspection Procedure Type Designation Description or Title Revision or Date Exercise Guide (OBE 5)
NF-AB-720 Control Rod Sequence Package Preparation, Review, Revision, and Implementation 13 Miscellaneous PRA CL 122A Paragon RICT Report 03/03/2025 ER-CL-600-2001 Clinton RICT System Guidelines 0
71111.13 Procedures OP-AA-108-118 Risk Informed Completion Time 3
- 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 02/14/2025 Engineering Changes 29951 Engineering Change Notice of Division I, II, and III Diesel Engine Overspeed Trip Range 12/05/1996 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 ESOMS Electronic Shift Operations Management System Narrative Logs 03/24/2025 ESOMS Electronic Shift Operations Management System Narrative Logs 01/28/2025 TS Clinton Technical Specifications 01/28/2025 Miscellaneous UFSAR 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 33 71111.15 Procedures 9082.01 Offsite Source Power Verification 42c 9058.02 RCIC/ECCS Water Leg Pump Comprehensive Testing 6
9061.01 Fuel Pool Cooling Valve Operability 48e 9068.03 Primary Containment Recombiner and Valve Operability Test 35 71111.24 Procedures 9080.03 Diesel Generator 1C Operability - Manual and Quick Start Operability 41
10 Inspection Procedure Type Designation Description or Title Revision or Date 9080.31 Diesel Generator Individual Engine Overspeed Trip Test and Adjustment 4c Work Orders WO 5602483 Flex - 1FX01KB DG Functional 02/18/2025 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 12 71114.06 Procedures EP-AA-112-500-F-01 Field Monitoring Team Checklist J
Miscellaneous NEI 99-02 Regulatory Assessment Performance Indicator Guideline 7
71151 Procedures 71151 Performance Indicator Verification 01/01/2025