ML25065A071

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)

See also: IR 05000263/2025010

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

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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

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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

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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

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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

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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

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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.