ML25218A164
| 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
Terry Brown Site Vice President Vistra Operations Company, LLC Davis-Besse Nuclear Power Station 5501 N. State Rte. 2, Mail Stop A-DB-3080 Oak Harbor, OH 43449-9760
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 cc w/ encl: Distribution via LISTSERV August 6, 2025 Signed by Feliz-Adorno, Nestor on 08/06/25
SUNSI Review
Non-Sensitive
Sensitive
Publicly Available
Non-Publicly Available OFFICE RIII RIII NAME BJose:gmp NFelizAdorno DATE 08/06/2025 08/06/2025
Enclosure U.S. NUCLEAR REGULATORY COMMISSION Inspection Report Docket Number:
05000346 License Number:
NPF-3 Report Number:
05000346/2025011 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
2
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.
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) 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 (6 Samples)
(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.
4 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 12/06/2023 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
5 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 2025 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 2025 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 2
M-503-00095 Reactor Vessel Details 2
M-503-00214 Instrument Nozzle Detail and Assembly 1
Drawings M-503-00224 Modified Instrumentation Nozzle 2
Engineering Changes 12-0764-000 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 4
LRPD-05,.11 Aging Management Program Evaluation Results - One Time Inspection Program 7
LRPD-05;.3 Aging Management Program Evaluation Results for Inaccessible Power Cables not Subject to 10 CFR 50.49 Requirements 4
Engineering Evaluations LRPD-06 Aging Management Program Evaluation Results - Above Ground Steel Tanks Inspection Program 6
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 22-Vendor-001 Bare Metal Visual Examination of Reactor Pressure Vessel Bottom Head and Instrument Penetrations 03/21/2022 24P-VT-033 Bare Metal Visual Examination of Hot Leg Level Tap RC-MK-A-32-1-WLB 03/22/2024 71003 NDE Reports API 653 Out of Service Inspection Report CST T31-2 04/10/2016
6 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 0
DB-FP-04035 5 Year Flow Test 09 DB-OP-06272 Station Drainage and Discharge System 35 DB-PF-00104 Inservice Inspection Program 19 DB-PF-00108 Alloy 600/690 Management Program 11 DB-PF-00108 Alloy 600/690 Management Program 11 EN-DP-01511 Structures Monitoring 16 EN-DP-01521 Administrative Procedure; Inaccessible Power Cables Not Subject to 10 CFR 50.49, Environmental Qualifications Requirements 1
ISIS-5 Fifth Ten Year Inservice Inspection Schedule 0
NG-EN-00552 Administrative Procedure for One Time Inspection Program 0
NOP-CC-5003 Processing Deviations to Materials Initiative Guidance 6
NOP-CC-5708 Written Practice for the Qualification and Certification of Nondestructive Examination Personnel 17 NOP-CC-5735 System Leakage (VT-2) Examinations 4
NOP-ER-2003 Alloy 600/690 Management Program 4
NOP-OP-1012 Material Readiness and Housekeeping Inspection Program 13 Procedures NOP-WM-4007-01 Excavation Permit 05
7 Procedures WDI-STD-1151 Generic Procedure for the Manual Ultrasonic Examination of Weld Overlaid Similar and Dissimilar Metal Welds Using EPRI-WOL-PA-01 2
200380013 DOST T-45 Internal Inspection 08/19/2021 200556326 Intake Canal Embankment 12/12/2014 200600767 Core Boring in ECCS Pump Rm 1 12/14/2014 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 12/12/2019 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