ML25253A472
| ML25253A472 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 09/11/2025 |
| From: | Thomas Briley NRC/RGN-III/DORS/EB1 |
| To: | Tony Brown Vistra Operations Company |
| References | |
| IR 2025012 | |
| Download: ML25253A472 (1) | |
See also: IR 05000346/2025012
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 - REQUEST FOR
INFORMATION FOR THE NRC AGE-RELATED DEGRADATION
INSPECTION: INSPECTION REPORT 05000346/2025012
Dear Terry Brown:
The purpose of this letter is to request information to support our scheduled age-related
degradation inspection beginning October 20, 2025, at Davis-Besse Nuclear Power Station.
This inspection will be performed in accordance with NRC baseline inspection procedure
71111.21N.04 Age-Related Degradation.
An initial list of documents requested to support identification of structures, systems, and
components (SSCs) that will be reviewed during the inspection is provided in enclosure 1.
For SSCs that the inspection team plans to review, an initial list of the documents the team
plans to review during the conduct of the inspection is listed in enclosure 2. The team leader will
contact you with identified SSCs. Also, personnel should be available at the site during the
inspection who are knowledgeable regarding maintenance, surveillance, testing, inspection, and
condition monitoring programs.
This letter contains voluntary information collections that are subject to the Paperwork
Reduction Act of 1995 (44 U.S.C. 3501 et seq.). The Office of Management and Budget (OMB)
approved these information collections (approval number 3150-0011). The burden to the public
for these information collections is estimated to average 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> per response. Send
comments regarding this information collection to the FOIA, Library and Information Collection
Branch, Office of the Chief Information Officer, Mail Stop: T6-A10M, U.S. Nuclear Regulatory
Commission, Washington, DC 20555-0001, or by email to Infocollects.Resource@nrc.gov, and
to the Desk Officer, Office of Information and Regulatory Affairs, NEOB-10202, (3150-0011)
OMB, Washington, DC 20503.
The NRC may not conduct nor sponsor, and a person is not required to respond to, a request
for information or an information collection requirement unless the requesting document
displays a currently valid OMB control number.
September 11, 2025
T. Brown
2
In accordance with Title 10 of the Code of Federal Regulations (CFR) 2.390, Public
Inspections, Exemptions, Requests for Withholding, of the NRC's Rules of Practice, a copy of
this letter, its enclosures, and your response (if any) will be available electronically for public
inspection in the NRCs Public Document Room or from the Publicly Available Records System
(PARS) component of NRCs Agencywide Document Access and Management System
(ADAMS). ADAMS is accessible from the NRC website at http://www.nrc.gov/reading-
rm/adams.html (the Public Electronic Reading Room).
If there are any questions about the material requested, or the inspection in general, please
contact me at 630-829-9595 or Thomas.Briley@nrc.gov.
Sincerely,
Senior Reactor Inspector
Engineering Branch 1
Division of Operating Reactor Safety
Docket No. 05000346
License No. NPF-3
Enclosure:
1. Requested Information to Support
Age-Related Degradation Sample
Selection
2. Requested Information to Support
Age-Related Degradation Inspection
cc: Distribution via LISTSERV
Signed by Briley, Thomas
on 09/11/25
T. Brown
3
Letter to Terry Brown from Thomas Briley dated September 11, 2025.
SUBJECT:
DAVIS-BESSE NUCLEAR POWER STATION - REQUEST FOR
INFORMATION FOR THE NRC AGE-RELATED DEGRADATION
INSPECTION: INSPECTION REPORT 05000346/2025012
DISTRIBUTION:
RidsNrrDorlLpl3
RidsNrrPMDavisBesse Resource
RidsNrrDroIrib Resource
R3-DORS
ADAMS Accession Number: ML25253A472
SUNSI Review
Non-Sensitive
Sensitive
Publicly Available
Non-Publicly Available
OFFICE
RIII
NAME
TBriley:gmp
DATE
09/11/2025
OFFICIAL RECORD COPY
Enclosure 1
Enclosure 1 - Requested Information to Support Age-Related Degradation Sample
Selection
The documents and information requested below should generally be made electronically
available to the inspection team for the teams use both on-site and off-site. At the end of the
inspection, the documents in the teams possession should not be retained.
This document request is based on typical documents that a generic plant might have. As such,
this document request is not meant to imply that any specific plant is required to have all the
listed documents. In addition, your plant-specific document titles may vary from the document
titles listed below.
The following information is requested by September 29, 2025, or sooner, to facilitate the
sample selections.
Documents requested, if applicable:
1.
List of 50.65 (a)(1) SSCs from the past 5 years.
2.
List of maintenance rule functional failures (including preventable) from the past 5 years
3.
Most recent evaluation of maintenance effectiveness required per 10 CFR 50.65(a)(3)
4.
Maintenance rule scoping and performance criteria document
5.
List of preventative maintenance deferrals and preventative maintenance change
requests in the last 5 years
6.
Equipment reliability characterization and preventative maintenance program procedures
7.
List of 10 CFR Part 21 Reports applicable to the site from the past 5 years
8.
Site specific corrective actions associated with component failures, or tagged with
aging, age-related, wear, accelerated wear, abnormal wear, accelerated
degradation, abnormal degradation, corrosion, degradation, etc.
9.
List of technical specification operability determinations from the past 5 years
10. List of risk-significant long-lived passive SSCs (for licensees in the period of extended
operation (PEO))
11. Aging management programs (AMPs) and any plant-specific or industry operating
experience reviews that have been used to update aging management activities
(for licensees in the period of extended operation)
12. List of top 100 most risk-significant structures and components. If possible, designate
the component as active or passive in the risk ranking
13. List of RISC-1, RISC-2, and RISC-3 SSCs (for licensees that implement 10 CFR 50.69)
2
14. Safety significant functions identified during the RISC categorization process, and
alternative treatment requirements (for licensees that implement 10 CFR 50.69)
15. Last feedback and process adjustment required per 10 CFR 50.69(e)(1) (for licensees
that implement 10 CFR 50.69)
16. Site specific probabilistic risk assessment (PRA) identifying risk-significant functions
17. List of systems (system numbers/designators and corresponding names)
Enclosure 2
Enclosure 2 - Requested Information to Support Age-Related Degradation Inspection
The team lead will identify samples (i.e., structures and components) after receipt of information
requested in enclosure 1. The documents and information requested below should generally be
made electronically available to the inspection team for the teams use both on-site and off-site.
At the end of the inspection, the documents in the teams possession should not be retained.
This document request is based on typical documents that a generic plant might have. As
such, this document request is not meant to imply that any specific plant is required to have all
the listed documents. In addition, your plant-specific document titles may vary from the
document titles listed below. We also request that the information provided be sorted by the
list below for each sample.
The following information is requested by October 13, 2025, or sooner, to facilitate the
inspection.
1.
List of corrective action documents for the last 10 years
2.
Maintenance, surveillance, testing, inspection, and condition monitoring testing
requirements, acceptance criteria, and periodicities
3.
Bases documents associated with maintenance, surveillance, testing, inspection, and
condition monitoring testing requirements, acceptance criteria, and periodicities
4.
Last 2 years of maintenance, surveillance, testing, inspection, and condition monitoring
testing results; for periodicities greater than 2 years, the last two test results
5.
Self-imposed and vendor recommendations
6.
If available
a)
Equipment reliability category/characterization (e.g., non-critical,
run-to-maintenance, etc.)
b)
Preventative maintenance templates for the maintenance strategy
c)
System design basis documents and the specific updated final safety analysis
report section that describes the function
d)
Piping and instrumentation drawings (P&IDs) and electrical one-line drawings
e)
Control circuit drawings
f)
Design/procurement specifications
g)
List of applicable modifications for the component
If you have questions regarding the information requested, please contact the lead inspector.