ML25343A344
| ML25343A344 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 12/15/2025 |
| From: | Clark J Security Performance Evaluation Branch |
| To: | Mudrick C Constellation Energy Generation |
| Shared Package | |
| ML25343A335 | List: |
| References | |
| ML25343A335 IR 2025420 | |
| Download: ML25343A344 (0) | |
Text
Christopher H. Mudrick Senior Vice President and Chief Nuclear Officer (CNO)
Constellation Energy Generation, LLC President, Constellation Nuclear 200 Exelon Way Kennett Square, PA 19348
SUBJECT:
BYRON STATION - SECURITY BASELINE INSPECTION REPORT 05000454/2025420 AND 05000455/2025420
Dear Christopher H. Mudrick:
On September 25, 2025, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Byron Station and discussed the results of this inspection with Harris Welt and other members of your staff. The results of this inspection are documented in the enclosed report.
Due to the temporary cessation of government operations, which commenced on October 1, 2025, the NRC began operating under its Office of Management and Budget-approved plan for operations during a lapse in appropriations. Consistent with that plan, the NRC operated at reduced staffing levels throughout the duration of the shutdown. However, the NRC continued to perform critical health and safety functions and make progress on other high-priority activities associated with the ADVANCE Act and Executive Order 14300.
On November 13, 2025, following the passage of a continuing resolution, the NRC resumed normal operations. However, due to the 43-day lapse in normal operations, the Office of Nuclear Reactor Regulation granted the Regional Offices an extension on the issuance of the calendar year 2025 inspection reports that should have been issued by November 07, 2025, to December 23, 2025. The NRC resumed the routine cycle of issuing inspection reports on November 13, 2025.
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.
December 15, 2025
Sincerely, Jefferson K. Clark, Chief Security Performance Evaluation Branch Division of Security Operations Docket Nos. 05000454 and 05000455 License Nos. NPF-37 and NPF-66
Enclosure:
As stated cc w/ encl: Distribution via LISTSERV Harris Welt, Site Vice President Drew Bush, Security Contact Signed by Clark, Jefferson on 12/15/25
Enclosure U.S. NUCLEAR REGULATORY COMMISSION Inspection Report Docket Numbers:
05000454 and 05000455 License Numbers:
NPF-37 and NPF-66 Report Numbers:
05000454/2025420 and 05000455/2025420 Enterprise Identifier:
I-2025-420-0012 Licensee:
Constellation Nuclear Facility:
Byron Station Location:
Byron, IL Inspection Dates:
July 21, 2025, to September 26, 2025 Inspectors:
C. Roundtree, Team Leader, NSIR K. Hussar, Senior Physical Security Inspector, RI C. Bustamante, Physical Security Inspector, NSIR S. Cavanaugh, Physical Security Inspector, RIII Approved By:
Jefferson K. Clark, Chief Security Performance Evaluation Branch Division of Security Operations
2
SUMMARY
The U.S. Nuclear Regulatory Commission (NRC) continued monitoring the licensees performance by conducting a security baseline inspection at Byron 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 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) 2201, Security Inspection Program for Commercial Nuclear Power Reactors. 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.
SAFEGUARDS 71130.03 - Contingency Response - Force-On-Force Testing Contingency Response - Force-On-Force Testing (1 Sample)
(1)
NRC inspectors completed the Contingency Response - Force-on-Force (FOF)
Testing inspection procedure by evaluating the licensees performance in implementing the physical protection program to detect, assess, interdict, and neutralize threats up to, and including, the design basis threat of radiological sabotage. Two NRC-evaluated FOF exercises were conducted for the evaluation.
REPORT ATTACHMENTS Supplemental Information for the report is considered Safeguards Information and is located separately within the NRCs Safeguards Information Local Area Network and Electronic Safe database (SLES), under NS126316.
INSPECTION RESULTS No findings were identified.
EXIT MEETINGS AND DEBRIEFS The inspectors verified no proprietary information was retained or documented in this report.
On September 25, 2025, the inspectors presented the security baseline inspection results to Harris Welt and other members of the licensee staff.
4 DOCUMENTS REVIEWED Inspection Procedure Type Designation Description or Title Revision or Date 71130.03 Corrective Action Documents AR #04680358 71130.03 Corrective Action Documents Resulting from Inspection AR 04876887 06/26/2025 71130.03 Corrective Action Documents Resulting from Inspection AR 04884454 07/22/2025 71130.03 Corrective Action Documents Resulting from Inspection AR 04884455 07/22/2025 71130.03 Corrective Action Documents Resulting from Inspection AR 04884723 07/23/2025 71130.03 Corrective Action Documents Resulting from Inspection AR 04885287 07/24/2025 71130.03 Corrective Action Documents Resulting from Inspection AR 04885291 07/24/2025 71130.03 Corrective Action Documents Resulting from Inspection AR 04890676 08/07/2025 71130.03 Corrective Action Documents AR 04894952 09/03/2025
5 Inspection Procedure Type Designation Description or Title Revision or Date Resulting from Inspection 71130.03 Corrective Action Documents Resulting from Inspection AR 04899129 09/18/2025 71130.03 Corrective Action Documents Resulting from Inspection AR 04900097 09/23/2025 71130.03 Corrective Action Documents Resulting from Inspection AR 04900105 09/23/2025 71130.03 Corrective Action Documents Resulting from Inspection AR 04900408 09/15/2025 71130.03 Corrective Action Documents Resulting from Inspection AR 04900429 09/24/2025 71130.03 Miscellaneous EP-AA-1002 Addendum 3 Hot Matrix Recognition Category Hazards and other Conditions Affecting Plant Safety Revision 6 03/2022 71130.03 Miscellaneous RPTADMIN2 -
0806637 Zone Alarm History by Clear Code 07/24/2025 71130.03 Miscellaneous RPTADMIN2 -
1107180 Card Alarm History by Clear Code 07/22/2025 71130.03 Miscellaneous Security Aid 001 Zone Map CAS/SAS/BRE/OCA Patrol Revision 7 71130.03 Miscellaneous Security Aid 017 MUX Device Reference Revision 4 71130.03 Miscellaneous Security Aid 089 Camera Information Revision 1 71130.03 Miscellaneous SY-AA-101-122-102 Section 4.4 Early Warning Detection Systems (EWS)
Revision 0
6 Inspection Procedure Type Designation Description or Title Revision or Date 71130.03 Miscellaneous SY-AA-101-122-104-F-03 Lighting Test Log Revision 0 71130.03 Miscellaneous SY-AA-101-124 Operation of the Security Control Centers Revision 16 71130.03 Miscellaneous SY-BY-101-116-1002-F-01 Vehicle Patrol Protected Area Barrier Patrol Checklist Revision 10 71130.03 Miscellaneous SY-BY-101-116-1002-F-01 Vehicle Patrol Protected Area Barrier Patrol Checklist Revision 10 71130.03 Miscellaneous SY-BY-101-116-1002-F-03 Foot Patrol Plant Checks: Turbine Building Checklist and Auxiliary Building Checklist Revision16 71130.03 Procedures 2025 Byron Protective Strategy Notes Revision 1 05/30/2025 71130.03 Procedures Byron Nuclear Power Station Security Plan, Training and Qualification Plan, Safeguards Contingency Plan, Independent Spent Fuel Storage Installation Security Program Revision 20 02/2025 71130.03 Procedures EWS Zones and Culverts 71130.03 Procedures Map Overlays 71130.03 Procedures RAMCAP Byron Blast Overlay 71130.03 Procedures Communications 71130.03 Procedures PA Buildings 71130.03 Procedures Security Vehicles 71130.03 Procedures PA & OCA Driving Paths 71130.03 Procedures Planned Security Upgrades 05/25/2025 71130.03 Procedures Security Equipment 71130.03 Procedures Staffing by Position 71130.03 Procedures Table of Security Personnel 71130.03 Procedures 2025 Limited Scope FOF Triennial Work Up Revision 0 71130.03 Procedures 3 Year Training Plan 2025-27 71130.03 Procedures Mock Adversary Force Mission Planning RFI 71130.03 Procedures Overhead Pictures 71130.03 Procedures Maps 71130.03 Procedures 0B0A Security - 1 Security Threat Unit 0 Revision 18 71130.03 Procedures Policy No: 600-04 Byron Operating Department Policy Statement Revision 35
7 Inspection Procedure Type Designation Description or Title Revision or Date 12/21/2018 71130.03 Procedures SY-BY-101-501 Byron Supplemental Safeguards Contingency Response Plan Final Revision 10 12/23/2023 71130.03 Procedures SY-BY-101-502 Target Sets Draft Revision 7 05/29/2025 71130.03 Procedures SY-BY-101-502 Target Sets Final 6-CCS 07/12/2024
ML25343A335; Ltr ML25343A344 OFFICE NSIR/DSO/SPEB R-III/DRS/PSB NSIR/DSO/SPEB
/ETA NSIR/DSO/SPEB
/ETA NAME CBustamante MZiolkowski CRoundtree JClark DATE Dec 11, 2025 Dec 11, 2025 Dec 15, 2025 Dec 15, 2025