IR 05000263/2024010

Age-Related Degrading Inspection Report 05000263/2024010

ML24131A123
Person / Time
Site:	Monticello
Issue date:	05/13/2024
From:	Sanchez Santiago E NRC/RGN-III/DORS/EB1
To:	Hafen S Northern States Power Company, Minnesota
References
IR 2024010
Preceding documents:	ML24040A048 (12 February 2024)
Download: ML24131A123 (1)

Text

SUBJECT:

MONTICELLO NUCLEAR GENERATING PLANT - AGE-RELATED DEGRADATION INSPECTION REPORT 05000263/2024010

Dear Shawn Hafen:

On April 4, 2024, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Monticello Nuclear Generating Plant 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, Elba M. Sanchez Santiago, Acting Branch Chief Engineering Branch 1 Division of Operating Reactor Safety Docket No. 05000263 License No. DPR-22 Enclosure:

As stated Distribution via LISTSERVMay 13, 2024 Signed by Sanchez Santiago, Elba on 05/13/24

ML24131A123 Non-Sensitive Publicly Available SUNSI Review Sensitive Non-Publicly Available

OFFICE RIII RIII

NAME TBriley:gmp ESanchez Santiago DATE 05/13/2024 05/13/2024

U.S. NUCLEAR REGULATORY COMMISSION

Inspection Report

Docket Number: 05000263

License Number: DPR-22

Report Number: 05000263/2024010

Licensee: Northern States Power Company, Minnesota

Facility: Monticello Nuclear Generating Plant

Location: Monticello, MN

Inspection Dates: March 11, 2024 to March 29, 2024

Inspectors: T. Briley, Technical Support Team Leader I. Hafeez, Senior Reactor Inspector M. Siddiqui, Reactor Inspector A. Valiaveedu, Reactor Sys Engineer

Approved By: Elba M. Sanchez Santiago, Acting Branch Chief Engineering Branch 1 Division of Operating Reactor Safety

Enclosure

SUMMARY

The U.S. Nuclear Regulatory Commission (NRC) continued monitoring the licensees performance by conducting an Age-Related Degradation Inspection at Monticello Nuclear Generating Plant, 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.

REACTOR SAFETY

71111.21N.04 - Age-Related Degradation Age-Related Degradation

The inspectors selected a sample of components and structures to verify that engineering performance and maintenance activities addressed age-related degradation and that problems were appropriately identified, addressed, and corrected.

Samples were selected considering risk insights and the potential for degradation.

Specifically, the inspectors selected samples that were risk-significant and either had indications of age-related degradation or were exposed to environments that could cause age-related degradation. The inspectors considered site-specific and industry-wide operating experience to identify samples and included both active and passive sub-components within each component or structure.

For each selected sample listed below, the inspectors reviewed the licensees engineering and maintenance activities credited to address age-related degradation to assess whether they were being performed using applicable standards and procedures, evaluated against appropriate acceptance criteria, and that maintenance and condition monitoring was completed at an appropriate interval. The inspectors also assessed whether issues identified during licensee activities were being entered into and addressed by the applicable station processes including the corrective action program, and whether periodic assessments of maintenance effectiveness and operating experience were being completed, including feedback and process adjustments.

(1) General Electric (GE) Magne Blast Breakers (Type AMH) - Bus 15 and 16

(2) GE Time Overcurrent Relays and Protective Schemes - Bus 15 and 16

(3) Reactor Protection System Motor Generator Sets

(4) Medium Voltage Cables (Safety-Related 4160 volt)

(5) High Pressure Coolant Injection Lubricating Oil System

(6) Emergency Diesel Generator 11 and 12 Fuel Oil Systems

(7) Hydraulic Snubber RV-26A-N2

(8) Emergency Diesel Generator 12 Lubricating Oil System

(9) Flood Doors 201 and 202 (Lower 4 Kilovolt Room Barriers)

(10) Reactor Water Cleanup Non-Regenerative Heat Exchanger

(11) Refuel Floor Area Radiation Monitors

(12) Torus Coating

INSPECTION RESULTS

No findings were identified.

EXIT MEETINGS AND DEBRIEFS

The inspectors verified no proprietary information was retained or documented in this report.

• On April 4, 2024, the inspectors presented the Age-Related Degradation Inspection results to Shawn Hafen and other members of the licensee staff.

DOCUMENTS REVIEWED

Inspection Type Designation Description or Title Revision or

Procedure Date

71111.21N.04 Corrective Action 01082766 Numerous Small Areas of the Containment Interior 09/17/2007

Documents Coatings Did Not Meet the Inspection Procedure

Acceptance Criteria

278920 Numerous Small Areas of PCT Coatings Failed 04/22/2012

Acceptance Criteria

01378342 0135/0140/1367/1132/0515/1368/IWE Inspection Results 04/10/2013

500001375234 Snubber at RV-26A-N2 Cold Setting is Below Allowed 03/18/2013

Minimum

500001482437 Cooling Capability of RWCU NRHX Being Challenged 06/10/2015

501000011954 11 EDG Low Oil Level 05/14/2018

501000023935 Discontinued Mobiltemp 78 Grease 03/07/2019

501000024419 MR A(1) Determination Needed for Deferral 03/18/2019

501000024680 Isolation Required to be Returned 03/24/2019

501000037836 MO-2009 Disconnected Motor Lead 02/17/2020

501000046702 Oil Slightly Low on 12 EDG 11/24/2020

501000047695 11 EDG Fuel Oil Weepage 01/12/2021

501000054532 12 EDG Crankcase Low Oil Level <-4" 07/28/2021

501000069127 Pre Outage Snubber WOs Challenged 12/08/2022

501000072747 RV-26A-N2 Piston Rod Extension Below Min 04/24/2023

501000081129 Snubber Return to Stock Issue 01/23/2024

Corrective Action 501000081403 L-44 Panel Door Open 01/29/2024

Documents 501000082461 Vendor Coatings Procedure Not Updated 03/01/2024

Resulting from 501000082542 Lisega Snubber VTM Not in Records 03/03/2024

Inspection 501000082737 ARD-2024 Difficulty Locating Documents 03/12/2024

501000082872 2024-ARD 0140 Procedure Clarification 03/14/2024

501000082893 2024-ARD Missing 2013 Vendor Report 03/18/2024

501000082972 ARD-2024 Incomplete WO 03/18/2024

501000082993 2024 ARD Unclear Basis for TS SR 3.8.3 03/18/2024

501000083002 ARD 2024 - STRIDE Question 03/19/2024

501000083013 ARD 2024 - Delayed Response Time 03/18/2024

501000083091 Relay Replacement PM Missed Scope 03/20/2024

Inspection Type Designation Description or Title Revision or

Procedure Date

501000083289 ARD-2024 Missed WO Sign-Off 03/25/2024

501000083313 Negative Trend in Records Quality 03/26/2024

501000083316 ARD 2924 Torus Coatings 03/25/2024

501000083338 2024 ARD - HPCI Oil Leaks 03/27/2024

501000083354 2024 ARD - Door Seal is Damaged 03/27/2024

501000083382 2024 ARD - Door Sealing Surface Corroded 03/27/2024

501000083383 2024 ARD - FE Flange Surface Corrosion 03/27/2024

501000083392 2024 ARD - EDG Crankcase Excess Sealant 03/27/2024

501000083421 ARD 2024 Process Issue 03/28/2024

501000083579 QA Question: 152-501/601 Protective Relay 03/31/2024

501000083735 ARD-2024 Inspector Observations/Exit 04/04/2024

Drawings E-502 Electrical Device Table B

NF-36298-1 Electrical Load Flow One Line Diagram 121

NF-36319 Door Schedule 97

NF-36319-1 Door Schedule 88

NF-36319-2 Door Schedule 84

NH-36254 Reactor Water Cleanup System 89

Engineering 16423 Lower 4KV HELB Flood Barrier 0

Changes 22180 Evaluation of RFO-26 Coatings / IWE Inspection Results0

Miscellaneous EQ-A EQ Central File Part A Equipment Master List 29

JKS-87-077 Evaluation of Snubber Lockup and Bleed Rates for 11/23/1987

Snubbers on the Safety Relief Valve Piping System

M.I. 1750 Diesel Fuel Recommendations All EMD and Former J

CDED Engines

M.I. 1752 Lubricating Oil Specifications Diesel Engine and E

Governor - EMD and CDED

NSPE-12-7023 Primary Containment Coating Inspection Test Results 02/22/1988

Package

NUC2019106 Suppression Chamber Nuclear Diving IWE & IWF 06/28/2019

[Proprietary] Examinations, Coating Inspection & Coating Repair 1R29

(RFO-29)

NUC2300001-L-MNGP Drywell, Drywell Head, Interior Vent Header, Torus 06/22/2023

CAR-001 Vapor Area Coating

Inspection Type Designation Description or Title Revision or

Procedure Date

[Proprietary]

NUC2300001-L-UESI QA Record RFO31 05/10/2023

SPREADSHEET-

001

NX-9216-7 999 System Generating Plant 19

PRA-MT-SY-DO Diesel Oil System Notebook 5.1

PRA-MT-SY-High Pressure Coolant Injection System Notebook 5.1

HPCI

Procedures 0140 Drywell Interior Surface Inspection 27

0192 Diesel Fuel Quality Check 46

0331 Snubber Records Review 14

0515 Primary Containment Visual Examination for Structural 18

Problems

24 Area Radiation Monitor Calibration 49

25-A Area Radiation Monitor Functional 25

AWI-08.11.03 Nuclear Coatings Program 16

CD 5.34 Safety-Related Coatings Standard 9

EWI-08.02.01 Snubber Program 17

EWI-08.07.01 Thermal Fatigue Monitoring Program 8

EWI-11.01.31 Protective Coating Monitoring and Maintenance Program 5

FG-OP-OL-02 Prompt Operability Determinations (POD) and Past 1

Operability Reviews (POR)

FP-E-MR-01 Maintenance Rule Process 12

FP-E-MR-03 Maintenance Rule Monitoring 8

FP-G-RM-01 Quality Assurance Records Control 36

FP-PA-ARP-01 CAP Process 64

FP-PE-SNUB-01 Snubber Program 2

MPS-0049 Monticello Fuel Oil Specification 3

NSP-DOL-0598 Diesel Fuel Oil Tank Inspections 7

STI Monticello Surveillance Test Intervals 12

UESI Procedure Underwater Coating Repair 1

QCP-10-2-MNGP

[Proprietary]

Inspection Type Designation Description or Title Revision or

Procedure Date

Work Orders 00453355 T-44, Cleaning, and Internal Visual Inspection 03/17/2013

25232 T-45B, Clean and Inspection 12 EDG Fuel Oil Day Tank 02/15/2007

357188 T-45A, Clean and Inspect Day Tank 03/19/2009

20960 EPRO - G-3B, Take Ultrasonic Thickness Measurements 11/02/2011

550245-01 T-45B, Perform Internal Visual Inspection 01/23/2017

2645-01 T-45A, Perform Internal Visual Inspection 01/10/2017

700025543 PM E-206 Clean HPCI Lube Oil Cooler 04/22/2019

700025645 PM E-206 Eddy HPCI Lube Oil Cooler 04/22/2019

700054304 Perform RWCU System Aging Management Walkdown 04/23/2021

RFO30

700054473 QIM_501000025970_4KVB-02 Acrid Odor from Charging 08/07/2020

Motor

700058159 Routine Lubrication and/or Oil Sampling 06/22/2021

700065488 G-3B Base Tank NDE UT Measurements 04/26/2022

700071751 P-217, Perform 4114-PM 03/21/2022

700086622 12 Emergency Diesel Generator / 12 ESW Monthly Pump 06/26/2021

and Valve Tests

700087248 Diesel Fuel Oil Tank Inspections 04/20/2023

700087476 12 Emergency Diesel Generator / 12 ESW Quarterly 07/27/2021

Pump and Valve Tests

700092256 Sample Oil and Change as Required on P-209, Grease 06/19/2023

P-212

700092992 RFO31 RWCU System Walkdown Observation 04/20/2023

700093793 Snubber Examination 02/07/2023

700105181 MST Support for 20 KIP Snubber 05/01/2023

700109710 Underground Storage Tank Monitoring 08/01/2023

700113647 Underground Storage Tank Monitoring 10/27/2023

700118612-10 Underground Storage Tank Liquid Level Correlation 03/23/2023

700123601 HPCI Quarterly Pump and Valve Tests 09/18/2023

700128867 Diesel Fuel Quality Check 46

700130862 Aboveground Storage Tank Inspection 02/25/2024

700133673 Fuel Oil Receiving Quality Check 11/15/2023

8