ML25065A071

Nuclear Generating Plant Request for Information for the NRC Quadrennial Comprehensive Engineering Team Inspection Inspection Report 05000263/2025010

ML25065A071
Person / Time
Site:	Monticello
Issue date:	03/06/2025
From:	Jorge Corujo-Sandin NRC/RGN-III/DORS/EB1
To:	Hafen S Northern States Power Company, Minnesota
References
IR 2025010
Download: ML25065A071 (1)

Text

Shawn Hafen Site Vice President Monticello Nuclear Generating Plant Northern States Power Company, Minnesota 2807 West County Road 75 Monticello, MN 55362-9637

SUBJECT:

MONTICELLO NUCLEAR GENERATING PLANT - REQUEST FOR INFORMATION FOR THE NRC QUADRENNIAL COMPREHENSIVE ENGINEERING TEAM INSPECTION: INSPECTION REPORT 05000263/2025010

Dear Shawn Hafen:

On August 25, 2025, the U.S. Nuclear Regulatory Commission (NRC) will begin a quadrennial baseline Comprehensive Engineering Team Inspection (CETI) at Monticello Nuclear Generating Plant. This inspection will be performed in accordance with NRC Inspection Procedure 71111.21M.

The CETI focuses on the design, maintenance, and operation of risk significant components with low margin, or associated with an accident scenario, or a specific system. The inspection also monitors the implementation of changes to structures, systems, and components as modifications to one system may also affect the design bases and functioning of interfacing systems as well as introduce the potential for common cause failures. The Components, Modifications, 50.59 Evaluations, 50.59 Screenings, and Operating Experiences to be reviewed during this baseline inspection will be identified as part of the preparation for the inspection and finalized during the first onsite inspection week. Additionally, the inspection team may request scenarios to be performed on the simulator. This request would require support from your simulator staff to validate scenarios, simulator time, and a crew to perform the actions which would most likely occur during the second onsite week. The team will work closely with your staff early on during the inspection process to ensure this activity can be accomplished with minimal impact.

The inspection will include 2 weeks onsite. The inspection team will consist of seven NRC inspectors who will focus on engineering/maintenance/operations of the selected components modifications, 50.59 Evaluations, 50.59 Screenings, and Operating Experiences. The current inspection schedule is as follows:

Preparation week:

August 18 - 22, 2025 Onsite weeks:

August 25 - 29, 2025 and September 8 - 12, 2025 March 6, 2025

S. Hafen 2

Experience with previous baseline design/modification inspections of similar depth and length has shown that this type of inspection is extremely resource intensive, both for the NRC inspectors and the licensee staff. In order to minimize the inspection impact on the site and to ensure a productive inspection for both parties, we have enclosed a request for information needed for the inspection.

It is important that all of these documents are up-to-date and complete in order to minimize the number of additional documents requested during the preparation and/or the onsite portions of the inspection. Insofar as possible, this information should be provided electronically to the lead inspector. The inspection information request has been divided into four groups, with their respective due dates:

April 11, 2025 - The first group lists information necessary for our initial risk-informed scoping activities and preliminary sample selections.

July 8, 2025 - The lead inspector will communicate the preliminary samples selected. This will include Components, Modifications, 50.59 Evaluations, and 50.59 Screenings.

August 11, 2025 - The second group of documents requested are those items needed to support our in-office preparation activities. During the in-office preparation activities, the team may identify additional information needed to support the inspection.

August 25, 2025 - The third group includes the additional information identified during the in-office preparation as well as plant-specific reference material. This information should be available to the team onsite.

After August 25, 2025 - The Fourth Group includes supporting information to be provided throughout the inspection. Specifically, corrective action documents and questions developed during the inspection are requested to be provided as the documents are generated.

In addition, the enclosure includes inspection logistics requests for August 4, 2025.

The lead inspector for this inspection is Jorge Corujo-Sandin. We understand that our licensing contact for this inspection is Carrie Seipp of your organization. If there are any questions about the inspection or the material requested in the enclosure, please contact the lead inspector at 630-829-9741 or via email at Jorge.Corujo-Sandin@nrc.gov.

S. Hafen 3

This letter does not contain new or amended information collection requirements subject to the Paperwork Reduction Act of 1995 (44 U.S.C. 3501 et seq.). Existing information collection requirements were approved by the Office of Management and Budget, Control Number 3150-0011. The NRC may not conduct or 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 Office of Management and Budget Control Number.

This letter and its enclosure 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 10 CFR 2.390, Public Inspections, Exemptions, Requests for Withholding.

Sincerely, Jorge Corujo-Sandin Senior Reactor Engineer Engineering Branch 1 Division of Operating Reactor Safety Docket Nos. 05000263 License Nos. DPR-22

Enclosure:

COMPREHENSIVE ENGINEERING TEAM INSPECTION REQUEST FOR INFORMATION cc: Distribution via LISTSERV Signed by Corujo-Sandin, Jorge on 03/06/25

ML25065A071

SUNSI Review

Non-Sensitive

Sensitive

Publicly Available

Non-Publicly Available OFFICE RIII NAME JCorujo-Sandin:gmp DATE 03/06/2025

COMPREHENSIVE ENGINEERING TEAM INSPECTION DOCUMENT REQUEST Enclosure COMPREHENSIVE ENGINEERING TEAM INSPECTION REQUEST FOR INFORMATION I.

ADMINISTRATIVE INSPECTION INFORMATION Inspection Report Number:

05000263/2025010 Onsite Inspection Dates:

August 25 - 29, 2025 and September 8 - 12, 2025 Inspection Procedure:

IP 71111.21M, Comprehensive Engineering Team Inspection Lead Inspector:

Jorge Corujo-Sandin, Senior Reactor Inspector RIII/DORS 630-829-9741 Jorge.Corujo-Sandin@nrc.gov Teammates:

The Team Lead will reach out once these have been assigned and provide their appropriate contact information. However, the inspection team will be comprised of a total of seven inspectors.

II.

LOGISTICS INFORMATION REQUESTS Email the following inspection logistics to the lead inspector by August 4, 2025, or sooner:

1.

Entrance meeting and exit meeting time and location. Please specify if located inside/outside the Protected Area. The Team Lead can provide further guidance.

2.

Room number/name and location of the room to be used by the inspection team while onsite. Please specify if the room is located inside/outside the Protected Area.

If available, provide a smaller breakout room nearby for interviews, etc.

3.

Current management and engineering organizational chart.

4.

Response team contact information (names and phone numbers) and team roles (e.g., management sponsor, lead, inspector counterpart).

5.

Any potential resource conflicts during the inspection (e.g., emergency drills, all-staff meetings, etc.).

6.

Available times, during the Monday and/or Tuesday of the second onsite week, to use the simulator to run scenarios. An operations crew to support this effort will also be required.

7.

Any on-site parking instructions and/or limitations.

8.

Availability to obtain lunch on-site (e.g., is a cafeteria available, etc.).

9.

Please clarify footwear requirements for general in plant walkdowns. Specifically, if safety shoes are required, or if serviceable shoes are acceptable.

COMPREHENSIVE ENGINEERING TEAM INSPECTION DOCUMENT REQUEST 2

III. INSPECTION INFORMATION REQUEST Contact the lead inspector as soon as possible if you have any questions regarding this information request. Provide the information electronically in PDF files, Excel, or other searchable formats, preferably via an electronic sharing service (CERTREC, ShareFile, Box, etc.). Specific Excel formats for various enclosure items may be requested to assist in inspection sample selection. If you do not have access to any of these services or similar, we can provide you access to Box, which can be used to upload, download, and share documents. The files should contain descriptive names and be indexed and hyperlinked to facilitate ease of use. Information in lists should contain enough information to be easily understood by someone who has knowledge of light-water reactor technology.

1.

Information Requested to Support Risk Informed Selections The following information is requested by April 11, 2025, or sooner, to facilitate the initial risk scoping required and to support the initial sample selections.

1.1.

Risk-Ranking of the top 250 components from your site-specific probabilistic safety analysis (PSA) sorted by Birnbaum Worth. Include values for Risk Achievement Worth, Risk-Reduction Worth, and Fussell-Vesely. Please provide the ranking in an Excel spreadsheet that contains the importance measures and the description of the basic event (e.g., not just the basic event designator).

1.2.

Provide a list of the top 250 cut-sets from your PSA. Provide the descriptions of the basic events in the list of cut-sets. (Provide in Excel format.)

1.3.

Provide a list of the top 100 cut-sets for each initiator modeled in the PSA that contributes more than 5 percent to the baseline plant core damage frequency.

(Provide in Excel format.)

1.4.

Copies of PSA system notebooks, Human Error Reliability Analysis Notebook, Internal Flood scenario notebook and latest internal event PSA summary document.

1.5.

List of systems, system numbers/designators, and corresponding system names.

1.6.

List of high-risk Maintenance Rule systems/components based on engineering or expert panel judgment (i.e., those systems/components not identified high-risk in the PSA).

1.7.

Electronic copies of simplified plant drawings (if available). Note: these may be uncontrolled documents such as big notes, training diagrams, etc.

COMPREHENSIVE ENGINEERING TEAM INSPECTION DOCUMENT REQUEST 3

1.8.

Electronic copies of updated final safety analysis report (UFSAR), Technical Specifications, Technical Specifications Bases, and Technical Requirements Manual.

1.9.

Provide copies of the emergency operating procedures and abnormal operating procedures.

1.10. Provide the in-service testing (IST) program document. Include the IST Program Basis document, or equivalent (if any).

1.11. Copies of procedures addressing the following: modifications, design changes, set point changes, equivalency evaluations or suitability analyses, post-modification testing, 10 CFR 50.59 evaluations and screenings, and UFSAR updates.

1.12. Structures, systems, and components (SSCs) in the Maintenance Rule (a)(1) category for the last 4 years.

1.13. Information of any common cause failure of components experienced in the last 4 years at your facility.

1.14. List of Causal Evaluations (e.g., Apparent Cause Evaluations, Root Cause Evaluations, etc.) associated with component failures or design issues initiated/completed in the last 4 years.

1.15. List of open operability evaluations.

1.16. Procedures addressing time critical and/or risk significant operator actions. If not part of the procedure, include a list of all time critical and/or risk significant operator actions. Identify those actions that do not have job performance measures.

1.17. List of permanent plant modifications to SSCs that are field work complete.

Do not include canceled or still in process modifications. For the purpose of this inspection, permanent plant modifications include permanent:

1.17.1 Plant changes, design changes, set point changes, completed in the last 4 years; 1.17.2 Equivalency evaluations, and suitability analyses completed in the last 4 years; 1.17.3 Procedure changes for Emergency Operating Procedures (EOPs),

Abnormal Operating Procedures (AOPs), surveillances, and test procedures in the last 4 years; and 1.17.4 Calculation changes that have been issued for use in the last 4 years.

COMPREHENSIVE ENGINEERING TEAM INSPECTION DOCUMENT REQUEST 4

1.18. A list of corrective action documents (open and closed) in the last 4 years that address permanent plant modifications issues, concerns, or processes. These documents should also include the corrective action documents associated with the modification implementation.

1.19. List of all 10 CFR 50.59 completed evaluations involving (a) calculations, (b) procedure revisions, (c) changes to the facility (modifications),

(d) non-routine operating configurations, or (e) departures in methods of analyses. The list should NOT include any evaluations which concluded a license amendment was required. Include evaluations performed over the last 4 years. This list should include 50.59 evaluations for the following:

1.19.1 Changes that have been made under the provisions of 10 CFR 50.59 that have been updated in accordance with 10 CFR 50.71(e)(4);

1.19.2 Modifications that are field work complete; and 1.19.3 Changes to calculations (or initiation of new calculations) that have been issued. The list should contain the number and title of each document, a brief description of the change, and the corresponding number and type of the affected document (i.e., the modification or procedure to which the evaluation applies).

1.20. A list of all 10 CFR 50.59 changes that have been screened out as not requiring a full evaluation involving (i.e., just a 50.59 Screening) in the last 4 years: (a) calculations; (b) procedure revisions; (c) changes to the facility (modifications); (d) non-routine operating configurations; or (e) departures in methods of analyses.

The list should contain the number and title of each document, a brief description of the change, and the corresponding number and type of the affected document (i.e., the modification or procedure to which the evaluation applies).

1.21. A list of any modifications, procedure revisions, or the UFSAR changes where it was determined that 10 CFR 50.59 did not apply (in the last 4 years).

1.22. A list of corrective action documents (open and closed) that address 10 CFR 50.59 issues, concerns, or processes. These documents should also include the associated corrective action documents and the 50.59 change implementation (in the last 4 years).

The list should contain the number, title, and revision (or date) of each document, the affected system and corresponding documentation (if applicable).

COMPREHENSIVE ENGINEERING TEAM INSPECTION DOCUMENT REQUEST 5

1.23. Copy of the UFSAR change log or a synopsis of the changes. This should include all of the changes made to the UFSAR that were incorporated in the last 10 CFR 50.71(e)(4) submittal.

2.

Information Requested for the Preliminary Selected Samples to be Available by August 11, 2025.

This information should be separated for each selected sample, especially if provided electronically (e.g., folder with component or modification name that includes calculations, condition reports, maintenance history, etc.).

2.1.

Corrective Action Program procedures, including the operability/functionality determination procedure.

2.2.

Quality Assurance Program document/procedure.

2.3.

A copy of any internal/external self-assessments and associated corrective action documents generated in preparation for the inspection.

2.4.

A copy of engineering/operations related audits completed in the last 2 years.

For the selected Components:

2.5.

System Health Reports, System Descriptions, Design Basis Documents, and/or Training Lesson Plans associated with each of the selected components.

2.6.

List of condition reports (corrective action documents) associated with each of the selected components for the last 4 years (Excel format preferred).

2.7.

For each selected component list of the maintenance history (corrective, preventive, and elective) over the last 10 years. Identify frequency of preventive maintenance activities.

2.8.

Aging Management Program documents applicable to each selected component.

2.9.

Provide an all-inclusive list of calculation revisions in effect associated with each of the selected components. Include document number, title, and revision number.

2.10. Copies of calculations associated with each of the selected components, excluding data files. If the number of applicable responses under this request, for a specific component, is excessive (e.g., more than 10 calculations), you may reach out to the Team Lead to for an alternative. [Pipe stress calculations excluded from this request.]

2.11. Electronic copies of electrical drawings (ac and dc) and key diagrams.

2.12. Electronic copy of Piping and Instrumentation Drawings (P&IDs) (if available).

2.13. Copies of operability evaluations (open/closed for last 4 years) associated

COMPREHENSIVE ENGINEERING TEAM INSPECTION DOCUMENT REQUEST 6

with each of the selected components and plans for restoring operability, if applicable.

2.14. Copies of operator work-around evaluations associated with each of the selected components and plans for resolution, if applicable.

2.15. Copies of any open temporary modifications associated with each of the selected components, if applicable.

2.16. Trend data on the selected electrical/mechanical components performance for last 4 years. (For example, pumps performance including in-service testing, other vibration monitoring, oil sample results, etc., for valves: stroke time and leak rate results, diagnostic trend data, etc.)

2.17. Provide copies of the normal and alarm response procedures associated with the selected components and selected scenarios (if any).

2.18. If available electronically, provide the vendor manual. Otherwise refer to section 5 of this RFI.

2.19. Completed tests and surveillances for each selected component performed during the last 3 years. For those tests and surveillances performed at a periodicity of greater than 3 years, provide the latest two performed. Include the associated acceptance criteria basis calculations. For those specific tests or surveillances performed at a periodicity resulting in excessive responses to this request, you may reach out to the Team Lead for an alternative.

For the selected Modifications, 50.59 Evaluations and 50.59 Screenings:

2.20. For each of the selected modifications, provide the engineering change package. Include any associated 50.59 Screening and/or 50.59 Evaluation.

2.21. Provide a copy of each selected 50.59 Evaluation.

2.22. Provide copies of the selected 50.59 Screenings.

2.23. The selected Modifications, 50.59 Evaluations and 50.59 Screenings will be further filtered by the inspectors until the final samples are selected. Once these are selected (during the preparation week and the first onsite week) the site should be prepared to provide other supporting documents for the selected item. Examples of supporting documents include:

Design drawings supporting the change Procedures, calculations, etc. affected by the change Post-modification test packages UFSAR changes generated (e.g., marked off pages)

COMPREHENSIVE ENGINEERING TEAM INSPECTION DOCUMENT REQUEST 7

3.

Additional Information to be Provided on August 25, 2025, When the Team is Onsite 3.1.

During the in-office preparation activities, the team will be making final selections and may identify additional information needed to support the inspection.

3.2.

Schedule of any testing/maintenance activities to be conducted on the selected components during the two onsite inspection weeks.

4.

Information Requested to be Provided Throughout the Inspection 4.1.

Any corrective action documents generated as a result of the teams questions during this inspection as the documents are generated.

4.2.

List of questions and/or document requests submitted by the team and their status (e.g., open, closed) sorted by inspector. Provide daily by 2:00 p.m., plant local time, to each inspector. It is recommended to provide the team leader with a master list sorted by inspector and each inspector with a list containing only the items originated by that inspector.

4.3.

If available in hard copy form, one complete set of P&IDs and simplified drawings (e.g., training schematics). If any of these documents is not available in hard copy form, contact the lead inspector.

4.4.

Please ensure that other supporting documents for the selected items have been located and are readily retrievable as the inspection team will likely be requesting these documents during the inspection. Examples of supporting documents are:

4.4.1 Individual Plant Examination/Probabilistic Risk Assessment report; 4.4.2 Procurement documents for components and modifications selected (verify retrievable);

4.4.3 Plant procedures (normal, abnormal, emergency, surveillance, etc.);

4.4.4 Vendor manuals; 4.4.5 Historical revisions of the Final Safety Analysis Report (FSAR),

including the Original FSAR and Original Safety Evaluation Report; and 4.4.6 Copy of electrical drawings, key diagrams, and isometrics (paper copies).

If you have questions regarding the information requested, please contact the lead inspector.