ML25209A151

Integrated Inspection Report 05000461/2025002

ML25209A151
Person / Time
Site:	Clinton
Issue date:	07/28/2025
From:	April Nguyen NRC/RGN-III/DORS/RPB1
To:	Rhoades D Constellation Energy Generation, Constellation Nuclear
References
IR 2025002
Download: ML25209A151 (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 05000461/2025002

Dear David Rhoades:

On June 30, 2025, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Clinton Power Station. On July 21, 2025, the NRC inspectors discussed the results of this inspection with A. Krukowski, Plant Manager, 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 https://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, April Nguyen, Team Leader Palisades Restart Team Division of Operating Reactor Safety Docket No. 05000461 License No. NPF-62

Enclosure:

As stated cc w/ encl: Distribution via LISTSERV July 28, 2025 Signed by Nguyen, April on 07/28/25

Letter to David Rhoades from April Nguyen dated July 28, 2025.

SUBJECT:

CLINTON POWER STATION - INTEGRATED INSPECTION REPORT 05000461/2025002 DISTRIBUTION:

Tim Steadham RidsNrrDorlLpl3 RidsNrrPMClinton Resource RidsNrrDroIrib Resource Jack Giessner Mohammed Shuaibi Diana Betancourt-Roldan John Pelchat Jared Heck Jennifer Dalzell R3-DORS ADAMS Accession Number: ML25209A151

SUNSI Review

Non-Sensitive

Sensitive

Publicly Available

Non-Publicly Available OFFICE R-III R-III NAME NShah:anm ANguyen DATE 07/28/2025 07/28/2025 OFFICIAL RECORD COPY

Enclosure U.S. NUCLEAR REGULATORY COMMISSION Inspection Report Docket Number:

05000461 License Number:

NPF-62 Report Number:

05000461/2025002 Enterprise Identifier:

I-2025-002-0053 Licensee:

Constellation Nuclear Facility:

Clinton Power Station Location:

Clinton, IL Inspection Dates:

April 01, 2025, to June 30, 2025 Inspectors:

J. Cassidy, Senior Health Physicist R. Farmer, Health Physicist T. Hartman, Senior Resident Inspector J. Hickey, Senior Project Engineer M. Learn, Team Leader A. Muneeruddin, Resident Inspector J. Murphy, Illinois Emergency Management Agency V. Rand, Project Engineer N. Shah, Senior Project Engineer J. Steward, Senior Resident Inspector Approved By:

April Nguyen, Team Leader Palisades Restart Team 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 April 12, May 17, May 31, June 14, June 21, and June 28, 2025, Unit 1 lowered power to between 75 and 85 percent RTP to perform planned control rod sequence exchange and other rod adjustments to ensure an even fuel depletion. Following completion of these reactivity manipulations, 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 including high winds and severe thunderstorms on April 2, 2025.

71111.04 - Equipment Alignment Partial Walkdown Sample (IP Section 03.01) (5 Samples)

The inspectors evaluated system configurations during partial walkdowns of the following systems/trains:

(1) division 2 shutdown service water system on April 15, 2025 (2) division 1 shutdown service water system on April 25, 2025 (3) division 2 emergency diesel generator fuel oil transfer system on April 29, 2025 (4) division 1 emergency diesel generator fuel oil transfer system on April 29, 2025 (5) component cooling water system on May 6, 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 Area A-3d, 762' auxiliary building non-safety related switchgear (west) on April 23, 2025 (2)

Fire Areas CB-3a through CB-3g, and CB-4, division 2 cable spreading room on April 23, 2025 (3)

Fire Area R-1c, 702' radwaste building basement north and south on May 8, 2025 (4)

Fire Area R-1h, 720' radwaste building intermediate floor north and south on May 14, 2025 (5)

Raw water treatment building on June 9, 2025 71111.07A - Heat Exchanger/Sink Performance Annual Review (IP Section 03.01) (1 Sample)

The inspectors evaluated readiness and performance of:

(1) 1vy03AB, residual heat removal (RHR) heat exchanger room cooler per work order (WO) 05409628-11 on April 24, 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 requalification simulator training on April 8, 2025.

Licensed Operator Requalification Training/Examinations (IP Section 03.02) (1 Sample)

(1)

The inspectors observed and evaluated a planned downpower to 85 percent RTP and performed a control rod pattern adjustment on April 12, 2025.

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) failure of 1RIX-PR034, off-gas pretreatment radiation monitor sample pump per action request (AR) 4843986 and (WO) 5631787-01 on April 10, 2025

5 (2) systems and support equipment readiness to perform containment venting without AC power available. This sample utilized elements of the Operating Experience Smart Sample 2020/01 Flex Equipment Design Control, Maintenance, and Testing, performed on May 8, 2025 Quality Control (IP Section 03.02) (1 Sample)

The inspectors evaluated the effectiveness of maintenance and quality control activities to ensure the following SSC remains capable of performing its intended function:

(1) commercial grade dedication of parts utilized to restore the division 2 switchgear heat removal ventilation system compressor, 1VX06CB to service per WO 05555842 on June 16, 2025 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) elevated risk (action green) due to a tornado warning issued for Dewitt County on April 2, 2025 (2) elevated risk (action green) due to planned work on the reserve auxiliary transformer B load tap controller during April 14, 2025, through April 19, 2025 71111.15 - Operability Determinations and Functionality Assessments Operability Determination or Functionality Assessment (IP Section 03.01) (5 Samples)

The inspectors evaluated the licensees justifications and actions associated with the following operability determinations and functionality assessments:

(1) 345 KV voltage transient caused a momentary spike, which resulted in the north bus voltage below the voltage band for reserve auxiliary transformer B load tap changer tap 1 position in manual per AR 4852085 on April 2, 2025 (2) division II emergency diesel generator fuel oil transfer pump failed surveillance test on low flow per AR 4860111 on April 28, 2025 (3) reactor recirculation jet pump number 9 indication failed high due to transmitter failure per AR 4864530 on May 15, 2025 (4) main turbine bypass valve number 1 fast acting solenoid actuated late per AR 487003487003on June 6, 2025 (5)

RHR pump minimum flow check valve, 1E12-F046B open exercise unsatisfactory per AR 4873782 on June 18, 2025

6 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) temporary transfer water from containment floor drain sump to the containment equipment drain sump per engineering change (EC) 644014 on May 29, 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)

RHR heat exchanger 1A cooling coil B, 1vy03AB leak testing following eddy current testing and plugging of one tube per WO 05409628 tasks 04 and 05 on April 16, 2025 (2) control room supply fan B testing following replacement of the fan blade and hub assembly per WO 5645427-04 on April 17, 2025 (3) condensate pump D minimum flow valve testing following replacement of the transducer per WO 05631661-03 on April 18, 2025 (4) division 2 4.16 KV degraded voltage trip functional testing following replacement of time delay relays per WO 05602069-01 on April 29, 2025 (5) reserve auxiliary transformer B post-maintenance test following replacement of the load tap changer motor and cam switches per WO 5588161-15 on April 21, 2025 (6) standby liquid control system pressure testing following replacement of the B pump discharge relief valve per WO 05605199-05 on May 7, 2025 (7) control room ventilation train A damper testing following maintenance on May 15, 2025 (8) control room ventilation train A supply fan, 0VC03CA testing following maintenance on May 20, 2025 (9) main steam line pressure low instrument line in service testing following failure and associated channel calibration of transmitter 1B21-N076A per WO 05555842-03 on June 6, 2025 Surveillance Testing (IP Section 03.01) (4 Samples)

(1) diesel generator 1C test mode override and load reject operability test per Clinton Power Station (CPS) 9080.26 on April 30, 2025.

(2) diesel generator 1C monthly operability test per CPS 9080.03 on May 7, 2025 (3)

RHR pump B operability test per CPS 9053.07 on June 18, 2025 (4) division 1 shutdown service water operability test per CPS 9069.01P001 on June 25, 2025

7 Inservice Testing (IST) (IP Section 03.01) (2 Samples)

(1) standby liquid control pump B operability test per CPS 9015.01 on May 13, 2025 (2)

RHR pump A operability/waterleg pump double check valve test per CPS 9052.01P002 on May 20, 2025 71114.06 - Drill Evaluation Required Emergency Preparedness Drill (1 Sample)

(1)

Clinton 2025 pre-exercise emergency plan drill on June 17, 2025 RADIATION SAFETY 71124.07 - Radiological Environmental Monitoring Program Environmental Monitoring Equipment and Sampling (IP Section 03.01) (1 Sample)

(1)

The inspectors evaluated environmental monitoring equipment and observed collection of environmental samples.

Radiological Environmental Monitoring Program (IP Section 03.02) (1 Sample)

(1)

The inspectors evaluated the implementation of the licensees radiological environmental monitoring program.

GPI Implementation (IP Section 03.03) (1 Sample)

(1)

The inspectors evaluated the licensees implementation of the Groundwater Protection Initiative (GPI) program to identify incomplete or discontinued program elements.

71124.08 - Radioactive Solid Waste Processing & Radioactive Material Handling, Storage,

& Transportation Radioactive Material Storage (IP Section 03.01) (2 Samples)

The inspectors evaluated the licensees performance in controlling, labeling and securing the following radioactive materials:

(1) shepherd calibrator and shipping pad (2) large fab shop, old resin storage building, and nuclear materials cage Radioactive Waste System Walkdown (IP Section 03.02) (2 Samples)

The inspectors walked down the following accessible portions of the solid radioactive waste systems and evaluated system configuration and functionality:

(1) radioactive waste truck bay and associated waste processing areas

8 (2) radwaste mixed storage area Waste Characterization and Classification (IP Section 03.03) (3 Samples)

The inspectors evaluated the following characterization and classification of radioactive waste:

(1) irradiated hardware (2) dry activated waste (3) suppression pool resin Shipment Preparation (IP Section 03.04) (1 Sample)

(1)

The inspectors observed the preparation of radioactive shipment W25-005 of irradiated hardware on May 23, 2025.

Shipping Records (IP Section 03.05) (4 Samples)

The inspectors evaluated the following non-excepted radioactive material shipments through a record review:

(1)

W24-018, Dry Activated Waste, Bear Creek, December 5, 2024 (2)

W24-013, Suppression Pool Resin, Clive, September 3, 2024 (3)

W25-001, Waste Sludge Resin, Clive, April 15, 2025 (4)

W25-005, Irradiated Hardware, WCS, May 23, 2005 OTHER ACTIVITIES - BASELINE 71151 - Performance Indicator Verification The inspectors verified licensee performance indicators submittals listed below:

MS06: Emergency AC Power Systems (IP Section 02.05) (1 Sample)

(1)

April 1, 2024, through March 31, 2025 MS07: High Pressure Injection Systems (IP Section 02.06) (1 Sample)

(1)

April 1, 2024, through March 31, 2025 MS08: Heat Removal Systems (IP Section 02.07) (1 Sample)

(1)

April 1, 2024, through March 31, 2025

9 71152A - Annual Follow-up Problem Identification and Resolution Annual Follow-up of Selected Issues (Section 03.03) (1 Sample)

The inspectors reviewed the licensees implementation of its corrective action program related to the following issues:

(1) nuclear fleet wide action 04787989-23 to risk rank all small-bore vent and drain pipes in the drywell that see primary system pressure that would prevent recurrence of a forced outage similar to what resulted from the C1F64 Clinton Power Station Forced Outage due to excessive drywell leakage event on May 23, 2023. Inspectors reviewed the site completed corrective actions for this issue on June 30, 2025.

71152S - Semiannual Trend Problem Identification and Resolution Semiannual Trend Review (Section 03.02) (1 Sample)

(1)

The inspectors reviewed the licensees corrective action program to identify potential trends in content and disposition of items listed in degraded equipment/operations concerns list, which is included in every plan of the day that might be indicative of a more significant safety issue. For this sample the inspectors focused on a snapshot of the 22 items contained in the degraded equipment/operations concerns list on May 7, 2025.

10 INSPECTION RESULTS Observation: Review of the Plan of the Day Degraded Equipment/Operations Concerns List 71152S The inspectors noted the degraded equipment/operations concerns list contained 22 work orders and is included in each plan of the day. The inspectors organized the 22 items into 4 categories related to the degraded conditions potential impact on the operating unit. There were 6 items associated with balance of plant-support, 4 items in balance of plant-electrical, 2 items in balance of plant-auxiliary, and 11 items in reactor-support. The inspectors reviewed the items for length of time on the list, potential for plant impacts if the identified condition worsened before correction, and potential cumulative impacts of all 22 items.

One item of note the inspectors evaluated was the item titled, Sudden drops in service air header pressure, added to the list on September 15, 2024. The issue was documented under AR 04801875 and work request (WR) 01567135. The licensees impact assessment states a loss of service air can result in undesired control rod insertion and a plant scram.

The inspectors noted the service air system was the subject of a previous problem identification and resolution trend sample in the third quarter of 2024, as documented in Inspection Report 2024003. In that report, the inspectors noted similar performance issues that did not result in a plant transient. The inspectors reviewed the service air system health report and noted multiple component deficiencies being tracked. Items include corrective actions for issues such as component leak by, overdue preventive maintenance, and unusual noises/indications.

The inspectors also evaluated three items associated with shutdown service water piping issues, including a code case repair, low ultrasonic thickness readings, and a through wall leak added from August to October of 2024. The inspectors reviewed the interim corrective actions and planned corrective actions to resolve the identified conditions.

Finally, the inspectors evaluated plant chiller WO-D which tripped due to low oil pressure caused by an oil leak, added to the list on April 17, 2025. The licensees impact assessment notes the loss of redundancy for the chilled water system and impact to temperature sensitive areas which may result in a scram. The inspectors reviewed the corrective actions and planned return to service schedule.

The inspectors did not identify any findings or violations of NRC requirements in the course of this review.

EXIT MEETINGS AND DEBRIEFS The inspectors verified no proprietary information was retained or documented in this report.

On July 21, 2025, the inspectors presented the integrated inspection results to A. Krukowski, Plant Manager, and other members of the licensee staff.

On May 29, 2025, the inspectors presented the radiation protection inspection results to A. Krukowski, Plant Manager, and other members of the licensee staff.

11 DOCUMENTS REVIEWED Inspection Procedure Type Designation Description or Title Revision or Date 4302.01 Tornado/High Winds 23d 71111.01 Procedures OP-AA-108-1001 Severe Weather and Natural Disaster Guidelines 30 M05-1036 sheet 001 P&ID Diesel Generator Fuel Oil System T

M05-1036 sheet 002 P&ID Diesel Generator Fuel Oil System T

M05-1052 sheet 2 P&ID Shutdown Service Water AV M05-1052 sheet 4 P&ID Shutdown Service Water X

M05-1052 sheet 5 P&ID Shutdown Service Water AH Drawings M05-9036 sheet 1 P&ID Div-1 Fuel Oil Tandem EMD 3869KW Diesel Generator Set 1DG01KA G

3211.01E001 Shutdown Service Water Electrical Lineup 18a 3211.01V001 Shutdown Service Water Valve Lineup 31 3506.01 Diesel Generator and Support Systems 41b 3506.01E001 Diesel Generator and Support Systems Electrical Lineup 18d 3506.01V001 Diesel Generator and Support Systems Valve Lineup 13a 71111.04 Procedures 3506.01V002 Diesel Generator and Support Systems Instrument Valve Lineup 11b 1893.04M122 762' Auxiliary Building Non-Safety Related Switchgear (West) 5a 1893.04M350 781 Control: Div 2 Cable Spreading Room Prefire Plan 5d 1893.04M600 702 Radwaste: Basement (South) Prefire Plan 5b 1893.04M601 702 Radwaste: Basement (North) Prefire Plan 5b 1893.04M610 720 Radwaste: Intermediate Floor (South) Prefire Plan 7a 1893.04M611 720-725 Radwaste: Intermediate Floor (North) Prefire Plan 5

Fire Plans 1893.04M912 Raw Water Treatment Building Prefire Plan 0

1019.05 Transient Equipment/Materials 26c 3822.11 Fire Extinguisher Maintenance 3

3822.13 Visual Inspections of Portable Fire Extinguishers 6

71111.05 Procedures 3822.13C001 Visual Inspection of Portable Fire Extinguishers Checklist -

4a

12 Inspection Procedure Type Designation Description or Title Revision or Date Power Block and Essential Areas Within Protected Area 71111.07A Engineering Evaluations VY-45 Performance Evaluation of VY System Cooling Coils Under SX Flow Testing Limits 5

3005.01 Unit Power Changes 55 3302.01 Reactor Recirculation (RR) 39e 3304.01 Control Rod Hydraulic & Control (RD) 42 3304.02 Rod Control and Information System (RC&IS) 42 ESG-LOR-OBE-001 Clinton Power Station Licensed Operator Training Simulator Exercise Guide 1

71111.11Q Procedures TQ-AA-155 Conduct of Simulator Training and Evaluation 15 Corrective Action Documents

04458706, 04505554,

04538194, 02464340,

04045129, 04352392,

04015784, 04221389, 04136932 Various ARs Associated with the System and Components Manipulated During the Activity 05/08/2025 Clinton Power Station Plant Status Report 03/11/2025 01479190 Purchase Order for 1VX06CB compressor component 10/07/2024 20626200 Commercial Grade Dedication Quality Receipt Inspection Package 09/09/2024 91010190 Commercial Grade Dedication Plan Evaluation 09/09/2024 91011720 Commercial Grade Dedication Plan Evaluation 10/04/2024 Miscellaneous 91011721 Commercial Grade Dedication Plan Evaluation 10/04/2024 Procedures 4303.01P0001 Containment Venting Without AC Power Available 08/30/2013 71111.12 Work Orders

5315952, 5292551,

5194798, 4945309,

1797187, 1635009, Various Work Orders on System Components Incorporated as Part of the Activity Under Review 05/08/2025

13 Inspection Procedure Type Designation Description or Title Revision or Date

1557859, 5106920,

1400874, 1300882,

4990640, 5388728, Miscellaneous OP-AA-108-118 RICT Record for Reserve Auxiliary Transformer B Inoperability 04/16/2025 4302.01 Tornado/High Winds 23d 71111.13 Procedures OP-AA-108-118 Risk Informed Completion Time 3

Corrective Action Documents 04843283 Enhancement IR for RHR B Observations 06/17/2025 Engineering Changes 642554 Evaluation of RHR B Pump Minimum Flow Acceptance 0

PTP-RH-1 RHR B Pump Curve 09/27/1985 Miscellaneous TS 3.8.1 Clinton Technical Specifications and Bases 04/02/2025 9041.01 Jet Pump Operability Test 05/15/2025 71111.15 Procedures 9082.01 Offsite Source Power Verification 43 71111.18 Engineering Changes 644014 Temporary Transfer Water from Containment RF to Containment RE 0

04833675 SX Piping Shaking 737' CB 01/30/2025 04856663 1VY03AB - Eddy Current Test Results 04/15/2025 04865169 0VC03CA crack found in removed hub 05/13/2025 04868124 Low UT Reading Obtained on 1SX93EA-3" 05/23/2025 Corrective Action Documents 4857731 RAT B LTC Expanded Scope 04/16/2025 640989 As Built Document Changes for RAT B MSC 0

Engineering Changes 641286 Tube Repair for Room Cooler Coils, 1VY03AA/AB 0

Engineering Evaluations VY-45 Performance Evaluation of VY System Cooling Coils Under SX Flow Acceptance Limits 5

3211.01 Shutdown Service Water 33d 9015.01 Standby Liquid Control System Operability 44 71111.24 Procedures 9052.01P002 RHR Pump A Operability/WLP Double Check Valve Test 000

14 Inspection Procedure Type Designation Description or Title Revision or Date 9080.03 Diesel Generator 1C Operability - Manual and Quick Start Operability 41 9080.26 DG 1C Test Mode Override and Load Reject Operability 7b 9866.02 VG/VC Charcoal Adsorber Leak Test 37 CPS 9069.01P001 Division 1 Shutdown Service Water Operability Test 0

MA-AA-716-230-1002 Vibration Analysis/Acceptance Guideline 7

01708072-02, 01871691-02, 04595054-02, 04595055-02, 04946944-02, 01661475-02, 01661475-03 Various Work Orders Associated with Post-Maintenance Testing of Control Room Train A Ventilation Dampers 05/15/2025 05289122-02, 05548656-03, 05239963-02 Various Work Orders Associated with 0VC03CA, Main Control Room Ventilation Supply Fan Maintenance and Testing 05/20/2025 05631329-01 9053.07B21 OP RHR Pump OPER Test (B Pump) 06/17/2025 Work Orders 05635953 OP SLC Pump B Operability 05/13/2025 71114.06 Miscellaneous SE-EP-2019 2025 Clinton Pre-Exercise Emergency Drill Package 06/17/2025 91W506166 Field Rotameter Calibration 11/04/2024 CL-90, CL-91, CL-99 Water Compositor Calibration 10/23/2024 Calibration Records Contract 01370443 Clinton Meteorological Calibration 08/13/2024 AR 04512570 NRC ID: Missed ODCM Sample 09/22/2022 AR 04727177 REMP/ODCM CL-14 Sampling Anomaly 01/08/2024 AR 04751534 0UIXPR050 All Channels Failed Primary Met Tower 02/20/2024 AR 04811494 ODCM/REMP - CL-99 Pipe Needs Extended 10/23/2024 AR 04846866 ODCM Sampling Anomalies CL-14 03/19/2025 71124.07 Corrective Action Documents AR 04855341 REMP Location CL-02 Timer Anomalies for 1Q2025 04/09/2025

15 Inspection Procedure Type Designation Description or Title Revision or Date AR 04867773 ODCM REMP Sampling 05/22/2025 Corrective Action Documents Resulting from Inspection AR 04867770 NRCID: Potential Enhancements in the AREOR 05/22/2025 Annual Report on the Meteorological Monitoring Program at the Clinton Power Station 2024 05/10/2025 12604558-RPT-1 2023 Hydrogeologic Investigation Report (HIR) 08/06/2024 U-604803 Clinton Power Station 2023 Annual Radiological Environmental Operation Report 04/15/2024 Miscellaneous U-604832 Clinton Power Station 2024 Annual Radiological Environmental Operation Report 04/29/2025 EIML-SPM-1 Sampling Procedures Manual 16 EN-AA-408 Radiological Groundwater Protection Program 3

EN-AA-408-4000 Radiological Groundwater Protection Program 14 Procedures EN-CL-408-4160 RGPP Reference Material for Clinton Power Station 8

Self-Assessments AR 04795557 NRC Inspection: Radiological Environmental Monitoring Program (IP 71124.07) 03/19/2025 Work Orders 05012252 Radiological Groundwater Protection Program Risk Reassessment 10/19/2023 Corrective Action Documents Resulting from Inspection AR 04867628 NRC ID Water on Floor of Old Resin Storage Building 05/21/2025 AS5-AS5B Dimensional/Visual Inspection Form 04/08/2025 D462939 10 CFR 61 DAW 2024 Waste Stream Review and Scaling Factor Determination Report 07/08/2024 D464242 10 CFR 61 Suppression Pool Resin Waste Stream Review and Scaling Factor Determination Report 09/03/2024 D464927 RP-AA-600-1005 Radioactive Shipment Notification Form, 09/03/2024 71124.08 Miscellaneous ES-WM-QA-2025-7 Certificate of Conformance, Energy Solutions 3-60B Transport Cask 04/16/2025

16 Inspection Procedure Type Designation Description or Title Revision or Date W24-018 RP-AA-600-1005 Radioactive Shipment Notification Form 12/05/2024 Miscellaneous NEI 99-02 Regulatory Assessment Performance Indicator Guideline 7

71151 Procedures 71151 Performance Indicator Verification 01/01/2025 Corrective Action Documents

4846474, 0486048401, 0485747501, 0486100401, 0485870901, 0485878201,

04862659, Miscellaneous System and component ARs 05/01/2025 71152S Work Orders 05650684-01, 05555842-02, 05658568-02, 05622558-01, 05627505-01,

01578152, 05104350-01, 05586848-01, 05586261-01, 05613518-01, 05661214-01, 05661214-03, 05662245-01, 05651611-01, 05588697-01,

01581550, 05608939-02, 05655934-01 Miscellaneous System and Component WOs 05/01/2025