IR 05000454/2025420
| 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
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
Inspection Report
Docket Numbers:
05000454 and 05000455
License Numbers:
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
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.
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.
DOCUMENTS REVIEWED
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
Corrective Action
Documents
AR #04680358
Corrective Action
Documents
Resulting from
Inspection
06/26/2025
Corrective Action
Documents
Resulting from
Inspection
07/22/2025
Corrective Action
Documents
Resulting from
Inspection
07/22/2025
Corrective Action
Documents
Resulting from
Inspection
07/23/2025
Corrective Action
Documents
Resulting from
Inspection
07/24/2025
Corrective Action
Documents
Resulting from
Inspection
07/24/2025
Corrective Action
Documents
Resulting from
Inspection
08/07/2025
Corrective Action
Documents
09/03/2025
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
Resulting from
Inspection
Corrective Action
Documents
Resulting from
Inspection
09/18/2025
Corrective Action
Documents
Resulting from
Inspection
09/23/2025
Corrective Action
Documents
Resulting from
Inspection
09/23/2025
Corrective Action
Documents
Resulting from
Inspection
09/15/2025
Corrective Action
Documents
Resulting from
Inspection
09/24/2025
Miscellaneous
Addendum 3
Hot Matrix Recognition Category Hazards and other
Conditions Affecting Plant Safety
Revision 6
03/2022
Miscellaneous
RPTADMIN2 -
0806637
Zone Alarm History by Clear Code
07/24/2025
Miscellaneous
RPTADMIN2 -
1107180
Card Alarm History by Clear Code
07/22/2025
Miscellaneous
Security Aid 001
Zone Map CAS/SAS/BRE/OCA Patrol
Revision 7
Miscellaneous
Security Aid 017
MUX Device Reference
Revision 4
Miscellaneous
Security Aid 089
Camera Information
Revision 1
Miscellaneous
SY-AA-101-122-
2
Section 4.4 Early Warning Detection Systems (EWS)
Revision 0
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
Miscellaneous
SY-AA-101-122-
104-F-03
Lighting Test Log
Revision 0
Miscellaneous
Operation of the Security Control Centers
Revision 16
Miscellaneous
SY-BY-101-116-
1002-F-01
Vehicle Patrol Protected Area Barrier Patrol Checklist
Revision 10
Miscellaneous
SY-BY-101-116-
1002-F-01
Vehicle Patrol Protected Area Barrier Patrol Checklist
Revision 10
Miscellaneous
SY-BY-101-116-
1002-F-03
Foot Patrol Plant Checks: Turbine Building Checklist and
Auxiliary Building Checklist
Revision16
Procedures
25 Byron Protective Strategy Notes
Revision 1
05/30/2025
Procedures
Byron Nuclear Power Station Security Plan, Training and
Qualification Plan, Safeguards Contingency Plan,
Independent Spent Fuel Storage Installation Security
Program
Revision 20
2/2025
Procedures
EWS Zones and Culverts
Procedures
Map Overlays
Procedures
RAMCAP Byron Blast Overlay
Procedures
Communications
Procedures
PA Buildings
Procedures
Security Vehicles
Procedures
Procedures
Planned Security Upgrades
05/25/2025
Procedures
Security Equipment
Procedures
Staffing by Position
Procedures
Table of Security Personnel
Procedures
25 Limited Scope FOF Triennial Work Up
Revision 0
Procedures
Year Training Plan 2025-27
Procedures
Mock Adversary Force Mission Planning RFI
Procedures
Overhead Pictures
Procedures
Maps
Procedures
0B0A Security - 1
Security Threat Unit 0
Revision 18
Procedures
Policy No: 600-04
Byron Operating Department Policy Statement
Revision 35
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
2/21/2018
Procedures
SY-BY-101-501
Byron Supplemental Safeguards Contingency Response
Plan Final
Revision 10
2/23/2023
Procedures
SY-BY-101-502
Target Sets Draft
Revision 7
05/29/2025
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