IR 05000346/2025011
| ML25218A164 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 08/06/2025 |
| From: | Nestor Feliz-Adorno NRC/RGN-III/DORS/ERPB |
| To: | Tony Brown Vistra Operations Company |
| References | |
| IR 2025011 | |
| Download: ML25218A164 (1) | |
Text
SUBJECT:
DAVIS-BESSE NUCLEAR POWER STATION - POST-APPROVAL LICENSE RENEWAL; PHASE 4 REPORT 05000346/2025011
Dear Terry Brown:
On July 29, 2025, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Davis-Besse Nuclear Power Station and discussed the results of this inspection with you 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, Néstor J. Feliz Adorno, Chief Engineering and Reactor Projects Branch Division of Operating Reactor Safety Docket No. 05000346 License No. NPF-3
Enclosure:
As stated
Inspection Report
Docket Number:
05000346
License Number:
Report Number:
Enterprise Identifier:
I-2025-011-0032
Licensee:
Vistra Operations Company, LLC
Facility:
Davis-Besse Nuclear Power Station
Location:
Oak Harbor, OH
Inspection Dates:
July 14, 2025 to July 29, 2025
Inspectors:
B. Jose, Senior Reactor Inspector
E. Magnuson, Reactor Inspector
A. Shaikh, Senior Reactor Inspector
Approved By:
Néstor J Feliz Adorno, Chief
Engineering and Reactor Projects Branch
Division of Operating Reactor Safety
SUMMARY
The U.S. Nuclear Regulatory Commission (NRC) continued monitoring the licensees performance by conducting a Post-Approval License Renewal; Phase 4 at Davis Besse Nuclear 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.
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 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.
OTHER ACTIVITIES
- TEMPORARY INSTRUCTIONS, INFREQUENT AND ABNORMAL
===71003 - Post-Approval Site Inspection for License Renewal The NRC conducted this Phase 4 Post-Approval Site Inspection for License Renewal in accordance with the License Renewal Inspection Program (LRIP). Per Inspection Manual Chapter 2516, the LRIP is the process used by NRC staff to verify the adequacy of Aging Management Programs (AMPs), Time Limited Aging Analyses (TLAAs), and other activities associated with the renew an operating license of a commercial nuclear power plant beyond the initial licensing period under Title 10 of the Code of Federal Regulations (CFR), Part 54, Requirements for the Renewal of Operating Licenses for Nuclear Power Plants. This inspection evaluated the licensee implementation of aging management activities by reviewing the AMPs listed below.
Post-Approval Site Inspection for License Renewal===
- (1) Nickel Alloy Management Program
- (2) Structures Monitoring Program
- (3) Above Ground Steel Tanks Inspection Program
- (4) Fire Water Aging Management Program
- (5) One Time Inspection Program
- (6) Inaccessible Medium Voltage Cables not Subject to 10 CFR 50.49 EQ Requirements Program
INSPECTION RESULTS
No findings were identified.
EXIT MEETINGS AND DEBRIEFS
The inspectors verified no proprietary information was retained or documented in this report.
- On July 29, 2025, the inspectors presented the Post-Approval License Renewal; Phase 4 results to Terry Brown and other members of the licensee staff.
DOCUMENTS REVIEWED
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
CR-2014-04548
Demin Water Supply Line Pipe Hanger Bent in Service Water
Tunnel
03/07/2014
CR-2014-12083
Volumetric Examination of Reactor Coolant System Branch
Connection Butt Welds Under ASME Code Case N-770-1
07/22/2014
CR-2016-09196
2016 Structures Monitoring; Room 30; Thru Wall Crack
Identified
07/26/2016
CR-2021-04894
Service Water Tunnel Ceiling Leak Impacting Conduits
Below
06/23/2021
CR-2022-09153
FSWOLs Item F-1 Compliance Review with 1 Additional
Weld Required for 4th Interval
11/30/2022
CR-2023-04143
Inadequate Timeliness to Complete Repairs to Switchyard
Tower Foundations
05/17/2023
CR-2023-05494
Transformer Structures Monitoring Inspection Findings
07/13/2023
CR-2023-05610
Manhole 3044 Support Degradation
07/18/2023
CR-2023-06260
Structures Monitoring - Turbine Building 567' Level
08/11/2023
CR-2023-06565
Structures Monitoring - Turbine Building North Slab
08/23/2023
CR-2023-06910
Structures Monitoring - Decay Heat Exchanger Pit
Intermediate Deficiency
09/07/2023
CR-2023-07979
Auxiliary Building Roof EN-DP-01511 Intermediate
Deficiency
10/24/2023
CR-2023-07990
Structures Monitoring - Diesel Oil Pump House
10/24/2023
CR-2023-08369
Structures Monitoring - Water Treatment Facility
11/08/2023
CR-2023-08568
Structures Monitoring - Service Water Tunnel and Valve
Rooms Deficiencies
11/16/2023
CR-2023-08841
Aging Management Inspection Scope Does Not Include
Stairwell AB-1
11/29/2023
CR-2023-08974
Structures Monitoring - BWST Trench Intermediate
Deficiencies
2/06/2023
CR-2024-03609
DB1R23 Cooling Tower and Canal Inspection Results
04/24/2024
71003
Corrective Action
Documents
CR-2024-03873
Leakage from Service Water Tunnel Ceiling Dripping on
Service Water Piping
04/30/2024
71003
Corrective Action
Documents
CR-2025-03016
Structures Monitoring - BWST Trench Intermediate
Deficiencies
04/21/2025
CR-G201-2008-
49007
Demin Water Header in Service Water Tunnel is Impacting
Plant Equipment
11/06/2008
Corrective Action
Documents
OE-2015-0418-5
RIS 15-10, Applicability of ASME Code Case N-770-1 as
Conditioned in 10 CFR 50.55a, Codes and Standards, to
Branch Connection Butt Welds
08/03/2015
CR 2025-05109
25 LR Phase 4 Inspection: NRC-Identified Temporary
Heater in DFP Room not Sufficiently Secured
07/16/2025
Corrective Action
Documents
Resulting from
Inspection
CR 2025-05360
25 LR Phase 4 Inspection: NRC-Identified Improvement
Opportunity for DB-FP-04035 Acceptance Criteria
07/28/2025
ISI-SK-006
Reactor Vessel Instrumentation Nozzle Details
M-503-00095
Reactor Vessel Details
M-503-00214
Instrument Nozzle Detail and Assembly
Drawings
M-503-00224
Modified Instrumentation Nozzle
Engineering
Changes
2-0764-000
Intake Canal Embankment
03/26/2013
CTLGroup Project
No. 000110
Petrographic Examination of Concrete Cores from Davis-
Besse Nuclear Power Plant, Oak Harbor, Ohio
03/26/2021
LRPD-05
Aging Management Program Evaluation Results - Fire Water
Program
LRPD-05,
2.11
Aging Management Program Evaluation Results - One Time
Inspection Program
LRPD-05;
4.3
Aging Management Program Evaluation Results for
Inaccessible Power Cables not Subject to 10 CFR 50.49
Requirements
Engineering
Evaluations
LRPD-06
Aging Management Program Evaluation Results - Above
Ground Steel Tanks Inspection Program
20-Vendor-003
Ultrasonic Examination of RC-MK-B-61-1-SW69A OWOL
03/13/2018
20-Vendor-006
Ultrasonic Examination of RC-MK-B-56-1-SW143A OWOL
03/13/2018
20-Vendor-009
Ultrasonic Examination of RC-MK-B-61-1-SW69A OWOL
03/14/2018
2-Vendor-001
Bare Metal Visual Examination of Reactor Pressure Vessel
Bottom Head and Instrument Penetrations
03/21/2022
Bare Metal Visual Examination of Hot Leg Level Tap RC-MK-
2-1-WLB
03/22/2024
71003
NDE Reports
API 653
Out of Service Inspection Report CST T31-2
04/10/2016
API 653
Out of Service Inspection Report CST T31-1
04/10/2016
API 653
In Service Inspection Report DOST T-45
04/08/2016
BOP-PT-16-085
PT Exam of 25 Locations on BWST 1-1
09/21/2016
BOP-UT-16-048
UT Exam of 25 Locations on BWST 1-1
09/22/2016
BOP-VT-16-083
VT-3 of T31-1 CST Inside Surface
04/11/2016
BOP-VT-16-084
VT-3 of T31-1 CST Outside Surface
04/11/2016
BOP-VT-16-101
VT-3 of T31-2 CST Inside Surface
04/14/2016
BOP-VT-16-102
VT-3 of T31-2 CST Outside Surface
04/14/2016
BOP-VT-16-184
VT-1 of BWST 1-1 Outside Surfaces
09/22/2016
BOP-VT-25-006
VT-3 of BWST Tank for Aging Mechanisms
06/03/2025
DB-VE-1R23-001
Ultrasonic Examination of DH-33A-CCA-4-1-FW1 Overlay
03/22/2024
DB-VE-1R23-002
Ultrasonic Examination of RC-MK-A-67-3-FW105B Overlay
03/22/2024
NUC2016118
Ultrasonic Thickness (UT) Examination of Borated Water
Storage Tank (BWST) Floor
DB-FP-04035
Year Flow Test
DB-OP-06272
Station Drainage and Discharge System
DB-PF-00104
Inservice Inspection Program
DB-PF-00108
Alloy 600/690 Management Program
DB-PF-00108
Alloy 600/690 Management Program
EN-DP-01511
Structures Monitoring
EN-DP-01521
Administrative Procedure; Inaccessible Power Cables Not
Subject to 10 CFR 50.49, Environmental Qualifications
Requirements
ISIS-5
Fifth Ten Year Inservice Inspection Schedule
NG-EN-00552
Administrative Procedure for One Time Inspection Program
NOP-CC-5003
Processing Deviations to Materials Initiative Guidance
NOP-CC-5708
Written Practice for the Qualification and Certification of
Nondestructive Examination Personnel
NOP-CC-5735
System Leakage (VT-2) Examinations
NOP-ER-2003
Alloy 600/690 Management Program
NOP-OP-1012
Material Readiness and Housekeeping Inspection Program
Procedures
NOP-WM-4007-
Excavation Permit
Procedures
WDI-STD-1151
Generic Procedure for the Manual Ultrasonic Examination of
Weld Overlaid Similar and Dissimilar Metal Welds Using
EPRI-WOL-PA-01
200380013
DOST T-45 Internal Inspection
08/19/2021
200556326
Intake Canal Embankment
2/12/2014
200600767
Core Boring in ECCS Pump Rm 1
2/14/2014
200631788
DOST T-45 Calking Inspection
09/16/2016
200675052
DB-T31-1 CST External Visual Exam and UT PM
01/18/2019
200675053
DB-T31-2 CST External Visual Exam and UT PM
2/12/2019
200882586
DOST T-45 PM
01/08/2024
200919164
BWST Pit Structures Monitoring Inspection
04/21/2025
71003
Work Orders
200919196
Remote Insp Mkup/Purif FItr Rm
05/21/2025