IR 05000263/2020001

Integrated Inspection Report 05000263/2020001

ML20125A337
Person / Time
Site:	Monticello
Issue date:	05/04/2020
From:	Hironori Peterson Region 3 Branch 3
To:	Conboy T Northern States Power Co
References
IR 2020001
Download: ML20125A337 (15)

Text

May 4, 2020

SUBJECT:

MONTICELLO NUCLEAR GENERATING PLANT - INTEGRATED INSPECTION REPORT 05000263/2020001

Dear Mr. Conboy:

On March 31, 2020, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Monticello Nuclear Generating Plant. On April 7, 2020, the NRC inspectors 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,

/RA/

Hironori Peterson, Chief Branch 3 Division of Reactor Projects Docket No. 05000263 License No. DPR-22

Enclosure:

As stated

Inspection Report

Docket Number: 05000263 License Number: DPR-22 Report Number: 05000263/2020001 Enterprise Identifier: I-2020-001-0049 Licensee: Northern States Power company, Minnesota Facility: Monticello Nuclear Generating Plant Location: Monticello, MN Inspection Dates: January 01, 2020 to March 31, 2020 Inspectors: D. Krause, Resident Inspector J. Nance, Reactor Engineer J. Robbins, Acting Sr. Resident Inspector A. Shaikh, Senior Reactor Inspector D. Szwarc, Senior Reactor Inspector P. Zurawski, Senior Resident Inspector Approved By: Hironori Peterson, Chief Branch 3 Division of Reactor Projects Enclosure

SUMMARY

The U.S. Nuclear Regulatory Commission (NRC) continued monitoring the licensees performance by conducting an integrated 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.

PLANT STATUS

Monticello began the inspection period operating at approximately 100 percent power and, with the following exceptions, remained at that level throughout the inspection period. Monticello performed multiple flexible power operations over the quarter, for electric grid efficiencies in the early mornings, reducing power to approximately 80 percent then returning to 100 percent power. On March 13, 2020, the unit was down-powered to 75 percent for control rod sequence exchange and quarterly turbine valve testing. Upon completion, the unit was returned to 100 percent power.

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/readingrm/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. From January 1 - March 19, 2020, the inspectors performed plant status activities described in IMC 2515, Appendix D, Plant Status, and conducted routine reviews using IP 71152, Problem Identification and Resolution. 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.

Starting on March 20, 2020, in response to the National Emergency declared by the President of the United States on the public health risks of the coronavirus (COVID-19), resident inspectors were directed to begin telework and to remotely access licensee information using available technology. During this time the resident inspectors performed periodic site visits each week and during that time conducted plant status activities as described in IMC 2515, Appendix D; and observed risk significant activities when warranted. In addition, resident and regional baseline inspections were evaluated to determine if all or portion of the objectives and requirements stated in the IP could be performed remotely. If the inspections could be performed remotely, they were conducted per the applicable IP. In the cases where it was determined the objectives and requirements could not be performed remotely, management elected to postpone and reschedule the inspection to a later date.

71111.01 - Adverse Weather Protection

Impending Severe Weather Sample (IP Section 03.02) (1 Sample)

(1) The inspectors evaluated the adequacy of the overall preparations to protect risk-significant systems from impending extreme low temperatures and large snow expected on January 16, 2020

71111.04 - Equipment Alignment

Partial Walkdown Sample (IP Section 03.01) (3 Samples)

The inspectors evaluated system configurations during partial walkdowns of the following systems/trains:

(1) Emergency Diesel Generator (EDG) 11 fuel oil system post maintenance on January 21, 2020

(2) MCC-111 - Lower 4 KV switchgear - protected for RPS MGs on January 30, 2020

(3) Upper 4 KV Switchgear - building scaffold close to sensitive equipment on

March 19, 2020 Complete Walkdown Sample (IP Section 03.02) (1 Sample)

(1) High Pressure Core Injection system full system alignment during Reactor Core Isolation Cooling planned maintenance outage on February 11 - 12, 2020

71111.05 - Fire Protection

Fire Area Walkdown and Inspection Sample (IP Section 03.01) (5 Samples)

The inspectors evaluated the implementation of the fire protection program by conducting a walkdown and performing a review to verify program compliance, equipment functionality, material condition, and operational readiness of the following fire areas:

(1) FZ-08, Cable Spreading Room on March 9, 2020

(2) FZ-02-C, West HCU on March 18, 2020

(3) FZ-03-A, Recirc MGs on March 17, 2020

(4) FZ-07-A, 125V Division 1 Battery on March 19, 2020

(5) FZ-13-A, Lube Oil Storage Tank on March 19, 2020

Fire Brigade Drill Performance Sample (IP Section 03.02) (1 Sample)

(1) Fire Drill on February 22, 2020

71111.06 - Flood Protection Measures

Inspection Activities - Internal Flooding (IP Section 03.01) (1 Sample)

The inspectors evaluated internal flooding mitigation protections in the:

(1) Lower Emergency Filtration Train (EFT) Building 933 ft level on March 5, 2020

71111.11Q - Licensed Operator Requalification Program and Licensed Operator Performance

Licensed Operator Performance in the Actual Plant/Main Control Room (IP Section 03.01)

(1 Sample)

(1) The inspectors observed and evaluated licensed operator performance in the Control Room during scheduled flex power operations when the licensee discovered the Gardell Software used to determine thermal power limits was not functioning due to the 2020 Leap Year Programming Issue on March 1, 2020

Licensed Operator Requalification Training/Examinations (IP Section 03.02) (1 Sample)

(1) The inspectors observed and evaluated Resident Inspector Quarterly Review of Licensed Operator Requalification on March 9, 2020

71111.12 - Maintenance Effectiveness

Maintenance Effectiveness (IP Section 03.01) (2 Samples)

The inspectors evaluated the effectiveness of maintenance to ensure the following structures, systems, and components (SSCs) remain capable of performing their intended function:

(1) 15 - 24vDC Battery and Battery Charger on February 4, 2020 through February 7, 2020

(2) 16 Instrument Air Compressor rework on January 30, 2020

71111.13 - Maintenance Risk Assessments and Emergent Work Control

Risk Assessment and Management Sample (IP Section 03.01) (5 Samples)

The inspectors evaluated the accuracy and completeness of risk assessments for the following planned and emergent work activities to ensure configuration changes and appropriate work controls were addressed;

(1) 16 Instrument Air Compressor on January 30, 2020

(2) V-AH-4A dampers failed to open on January 29, 2020

(3) MO-2009, Residual Heat Removal (RHR) Torus Cooling Injection/Test Inboard Isolation Valve Testing Anomaly and Degraded Parts on February 19, 2020

(4) Floating and non-floating foreign material found in the standby liquid control test tank from February 5, 2020 - February 21, 2020

(5) DPIS-2-129C, Low Pressure Coolant Injection (LPCI) Loop Select Bellows failure on February 13, 2020

71111.15 - Operability Determinations and Functionality Assessments

Operability Determination or Functionality Assessment (IP Section 03.01) (5 Samples)

The inspectors evaluated the licensee's justifications and actions associated with the following operability determinations and functionality assessments:

(1) High Pressure Core Injection system operability evaluation

(2) 24 vdc Battery #15 functionality / operability evaluation

(3) Valve Stem position test indicator AOV-008 failed calibration - impacts to PCIVs

(4) XP-1, Standby Liquid Control Poison Tank Outlet Valve bonnet gasket found to be non-safety related material

(5) MOV Fatigue Life Cycling

71111.18 - Plant Modifications

Temporary Modifications and/or Permanent Modifications (IP Section 03.01 and/or 03.02)

(1 Sample)

The inspectors evaluated the following temporary or permanent modifications:

(1) Residual Heat Removal Seal Cooler Engineering Change Request to replace leaking fittings on RHR water side of seal cooler

71111.19 - Post-Maintenance Testing

Post-Maintenance Test Sample (IP Section 03.01) (6 Samples)

The inspectors evaluated the following post maintenance test activities to verify system operability and functionality:

(1) 4056-01, CRV-EFT, V-EAC-14A Condenser Inspection and Cleaning PMT, WO 700040037, CAP 501000036284, on January 8, 2019

(2) MO-2373 Main Steam Line Drain Inboard Isolation valve 480V Breaker, B4333, PMT, WO 700039522, CAP 501000036831, on January 22, 2020

(3) LS-23-90, HPCI Steam Supply drain Valve level switch PMT, WO 700069545, CAP 501000036758, on January 29, 2020

(4) 12 Core Spray Pump, P-208B PMT on February 18, 2020

(5) MO-2009, RHR-Torus Cooling Injection/Test Inboard Isolation Valve PMT on February 19, 2020

(6) XP-17, Standby Liquid Control Test Tank Suction Isolation Valve PMT on February 21, 2020

71111.22 - Surveillance Testing

The inspectors evaluated the following surveillance tests:

Surveillance Tests (other) (IP Section 03.01)

(1) Emergency Diesel Generator (EDG) 12 Quarterly Surveillance Test on

January 27, 2020 Inservice Testing (IP Section 03.01) (3 Samples)

(1) Control Rod Drive Hydraulic System Quarterly Valve Exercise Test, WO 700060442, on January 7, 2019

(2) 0255-11-III-3, 13 ESW Pump Flow Test, WO 700060427, on January 8, 2019

(3) OPS-SLC, 0255-02-III, SBLC Pump In Service on February 3, 2020

Containment Isolation Valve Testing (IP Section 03.01) (1 Sample)

(1) 0143, Drywell - Torus Quarterly Vacuum Breaker Check, WO 700067138, on January 8, 2019

71114.06 - Drill Evaluation

Drill/Training Evolution Observation (IP Section 03.02) (1 Sample)

The inspectors evaluated:

(1) RQ-SS-175 on March 9,

OTHER ACTIVITIES - BASELINE

===71151 - Performance Indicator Verification The inspectors verified licensee performance indicators submittals listed below:

IE01: Unplanned Scrams per 7000 Critical Hours Sample (IP Section 02.01) ===

(1) Unit 1 (January 2019 - December 2019)

IE03: Unplanned Power Changes per 7000 Critical Hours Sample (IP Section 02.02) (1 Sample)

(1) Unit 1 (January 2019 - December 2019)

IE04: Unplanned Scrams with Complications (USwC) Sample (IP Section 02.03) (1 Sample)

(1) Unit 1 (January 2019 - December 2019)

71152 - Problem Identification and Resolution

Semiannual Trend Review (IP Section 02.02) (1 Sample)

The inspectors reviewed the licensee's corrective action and adverse condition monitoring programs, from July 1 - December 31, 2019

(1) Potential adverse trends involving repetitive issues of the Control Room Ventilation 'B' train compressor

Annual Follow-up of Selected Issues (IP Section 02.03) (1 Sample)

The inspectors reviewed the licensees implementation of its corrective action program related to the following issues:

(1) Heating Boiler Trips and Maintenance Issues

71153 - Followup of Events and Notices of Enforcement Discretion Event Followup (IP Section 03.01)

The inspectors evaluated an off-site event for potential E-Plan Entry

(1) Becker Recycling Center Fire potentially involving hazardous materials and toxic gasses

INSPECTION RESULTS

Observation: Multiple heating boiler failures occurred during the 2019/20 winter 71152 season having the potential to impact reactor building differential pressure and steam chase temperatures.

During the past two winters (2019 and 2020), the licensee has had many issues with their heating boiler. Although the heating boiler is not safety-related, failures of this system negatively affect the safety-related reactor building ventilation system. Specifically, reactor building ventilation is required to ensure that reactor building differential pressure remains negative and that temperatures in the steam chase area remain below limits that can require the reactor be shutdown. The inspectors reviewed the previous boiler failures and determined that they were not reportable, as the licensee did not approach any Technical Specification limits. The licensee issued a trend Corrective Action QIM, 501000034054, to document and acknowledge challenges with heating boiler reliability.

The inspectors reviewed licensee corrective actions associated with Corrective Action QIM 501000034054; Abnormal trend in heating boiler trips, QIM 501000033437; P-76A unusually noisy & HTB trip, QIM 501000033517; Heating boiler lockouts, and others.

The inspectors assessed the following performance attributes in their review:

• Complete and accurate identification of the problem in a timely manner commensurate with its safety significance and ease of discovery;

• Consideration of the extent of condition, generic implications, common cause, and previous occurrences;

• Evaluation and disposition of operability/functionality/reportability issues;

• Classification and prioritization of the resolution of the problem commensurate with safety significance;

• Identification of corrective actions, which were appropriately focused to correct the problem; and

• Completion of corrective actions in a timely manner commensurate with the safety significance of the issue.

The inspectors selected this sample due to the operability impact on reactor building ventilation and steam chase temperature, both safety significant systems. Inspectors focused review of the above attributes on the licensees corrective actions associated with QIMs 501000034054, 501000033517 and 501000033437. Inspectors did not identify a performance deficiency with this issue.

Observation: Potential adverse trends involving repetitive issues associated with 71152 the Control Room Ventilation 'B' train compressor.

The inspectors performed a semi-annual review, of the licensee's corrective action and adverse condition monitoring programs, from July 1 - December 31, 2019, for potential adverse trends. The inspectors noted several failures of the Control Room Ventilation 'B' train compressor to start. Based on these events, the inspectors reviewed the licensees corrective action program (CAPs 501000029837, V-EAC-14B Compressor Trip on Startup and 501000032534, V-EAC-14B Compressor Tripped During Swap), trend reports, major equipment problem lists, system health reports, self-assessments, and additional documents, to identify trends that might indicate the existence of a more significant safety issue.

Programmatic requirements and processes were also reviewed to determine whether adverse conditions related to control room ventilation were being appropriately tracked, managed, and resolved. The inspectors also reviewed the licensees selection of criteria or set points for which further evaluation or action was designated to assess the health of the adverse condition monitoring program.

The inspectors did not identify any significant trends that might indicate the existence of a more significant safety concerns that had not been previously addressed by the licensee, nor did the inspectors identify any performance deficiency with this issue.

Observation: Becker Recycling Center Fire potentially involving hazardous 71153 materials and toxic gasses.

The inspectors evaluated Site impacts, and licensees response to the Becker Recycling Center Fire. This issue was selected due to the potential for meeting E-Plan entry conditions during an off-site event. i.e., a fire potentially involving hazardous materials and toxic gasses that might impede free moment of plant personnel on-site or responding to the protected area during the fire (February 18 - 21, 2020). No alarms occurred nor were any site action levels reached during the event. The fire was brought under control within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />, by off-site responders, prior to meeting criteria for event reporting. The licensee has documented lessons learned during this event in CAP 50100037884, Becker Recycling Facility Fire.

The inspectors did not identify any programmatic or process inadequacies, nor did the inspectors identify any performance deficiency with this issue.

EXIT MEETINGS AND DEBRIEFS

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

• On April 7, 2020, the inspectors presented the integrated inspection results to Mr. T. Conboy, Site Vice President, and other members of the licensee staff.

DOCUMENTS REVIEWED

Inspection Type Designation Description or Title Revision or

Procedure Date

71111.01 Corrective Action 501000036610 Bromide Vent Plugged with Ice 0

Documents

Procedures B.08.07-05 Operations Manual - Heating and Ventilating 64

1444 Pre and Post Severe Weather Inspection Checklist 17

C.4-B.08.03.A Operations Manual Abnormal Procedures Loss of Heating 21

Boiler

C.4-B.08.07.A Operations Manual Abnormal Procedures Ventilation 44

System Failure

71111.04 Corrective Action 501000037877 HPCI-90, Valve not Included in 2154-10 0

Documents

Procedures 2154-10 High Pressure Coolant Injection System Prestart Valve 39

Checklist

B.09.6-05 Ops Manual 4.16 kV Station Auxiliary System Operation 54

NF-36298-1 Electrical Load Flow One-Line Diagram 117

NH-36051 P&ID Diesel Oil System 87

NH-36051-1 P&ID Diesel Oil System 77

71111.05 Corrective Action 501000038446 Replaced CSR Thermal Detector Issue 0

Documents

Fire Plans 0328 Cable Spreading Room Halon System 28

Fire Zone - Recirc MG Set Room 9

Strategy A.3-03-A

Fire Zone - Division 1 125 VDC BAttery Room 8

Strategy A.3-07-A

Fire Zone - Cable Spreading Room 16

Strategy A.3-08

Fire Zone - Lube Oil Tank Room 5

Strategy A.3-13-A

Fire Zone- Reactor Building (West HCU Area) - Elevation 936' 14

Strategy A.3-02-C

Miscellaneous A.3-20 Fire Brigade Drill Guide, Heater Boiler Fuel Pump Fire, Drill 0

Guide "20.01"

71111.05 Miscellaneous STRATEGY Fire Zone 20 Auxiliary Boiler Room 15

A.3-20

71111.06 Miscellaneous DBD-T.08 Internal Flooding 5

Procedures 4 AWI-08.01.03 HELB Practices 28

C.4-1 Abnormal Plant Flooding 18

Procedures

Strategy A.3-31-B Fire Zone 31-B, EFT Building First Floor (Div II) 17

71111.11Q Corrective Action 501000038262 Backup Thermal Limit Monitoring 0

Documents 501000038280 Gardel not Updating 0

Miscellaneous Ops Man C.2-01 Power Operation - Function and General Description 31

RQ-SS-175 LOR/DEP Simulator Scenario 0

Procedures DP-NF-NAD-19 Monticello Gardel Backup Using SIMULATE-3 2

NUC-03.12 Periodic Core Follow Data For NAD 7

71111.12 Corrective Action 501000035940 15 Battery Cells 16 - 18 SG Found Low 12/19/2019

Documents 501000037160 Late Identification of Parts for K-1F 0

501000037180 16 Air Compressor Loading/Unloading Issues 0

Work Orders WO 700058662 4953-PM, Instrument and Service Air System - 01/30/2020

Air Compressors

WO 700058665 K-1F - Replace Drive Coupling Insert PM 01/27/2020

WO 700061191 FINE-D5, Replace Cells 16, 17, & 18 in 15 Battery 12/17/2019

WO 700063469 No. 15 24 VDC Battery Operability Check 12/19/2019

71111.13 Corrective Action 501000036631 V-AH-4A Isolation Damper Failed to Open 0

Documents 501000037180 16 Air Compressor Loading/Unloading Issues 0

501000037301 Leak/FME into T-201 SLC Test Tank 0

501000037384 Flakes of Material in SBLC Test Tank 0

501000037674 Substance Observed From DPIS-2-129C 0

501000037819 MO-2009 As Found Anomaly 0

501000037836 MO-2009 Disconnected Motor Lead 0

501000037854 Degraded Parts Found on MO-2009 0

Work Orders 7000070493 Recirc Loops DP-LPCI Select Interlock Replace Switch 02/13/2020

700058662 4953-PM, Instrument and Service Air Compressors 01/30/2020

700063062 MO-2009 RHR-Torus Cooling Injection/Test Inboard 02/19/2020

Isolation Valve Testing

700069350 Surveillance for Secondary Containment Isolation Damper 01/29/2020

V-D-61

71111.15 Corrective Action 501000035940 15 Battery Cells 16-18 SG Found Low, Drawing 76

Documents NE-36640-6, 24V DC Distribution - Panel D15, D25

501000036758, Received C03-B-10 Annunciator, 01/21/2020 and eSOMS 01/21/2020

Plant Narrative Log

501000037190 AOV-008 (30 Inch Stem Position Encoder) Failed Vendor 0

Calibration

501000037919 MOV Fatigue Life Cycling 0

501000038319 XP-1 has NSR Gasket 0

Drawings NE-36640-6 24V DC Distribution - Panel D15, D25 76

Engineering EC 0000026038 EQ MOV Cycling Limit Extension to 4000 Cycles for 0

Changes Limitorque and Rotork NA1 Actuators

Miscellaneous EQ 98-026 Limitorque Motor Operators (50.49) 3

71111.18 Corrective Action 501000038353 RHR Seal Cooler Issue 0

Documents

Miscellaneous ERC 11 RHR Seal Cooler Connection 0

601000002015

Work Orders 700062848 P-202A, Repair Seal Cooler Leak 0

71111.19 Corrective Action 501000036284 TCV-4030A Leaking 0

Documents 501000036298 V-EAC-14A Condenser Drain Plug Degraded 0

501000036758 Received C03-B-10 Annunciator 0

501000036831 B4333 PM did not Complete as Scheduled 0

700039522 MO-2373 Main Steam Line Drain Inboard Isolation Valve 01/22/2020

480V Breaker, B4333, Perform PMT

700040037 CRV-EFT V-EAC14A Condenser Inspection and Cleaning 01/08/2020

PMT

700040125 4058-02-OCD, 12 Core Spray Pump, P-208B Pressure Test 02/18/2020

PMT

700063062 MO-2009, RHR-Torus Cooling Injection/Test Inboard 02/19/2020

Isolation Valve PMT

700069545 HPCI Steam Drain Hi Level Bypass LS-23-90 PMT 01/29/2020

700070302, XP-17 Replace Bonnet Gasket 02/21/2020

71111.22 Corrective Action 501000037405 XP-16 Possible Leak By 0

Documents

Work Orders 700060427 0255-11-III-3, 13 ESW Pump Flow Test 01/08/2020

700060442 CRH 0255-01-IA - Control Rod Drive Hydraulic System 01/07/2020

Quarterly Valve Exercise Test

700060767 0187-02, 12 Emergency Diesel Generator Quarterly 0

Surveillance Test

700063330 OPS-SLC, 0255-02-III, SBLC Pump In Service 02/19/2020

700067138 0143, Drywell - Torus Quarterly Vacuum Breaker Check 01/08/2020

71114.06 Miscellaneous RQ-SS-175 LOR/DEP Simulator Scenario 0

71151 Miscellaneous Unplanned Scrams per 7000 Critical Hours, QF0445, 14

Monthly Submission Forms (January - December 2019)

Unplanned Power Changes per 7000 Critical Hours, 14

QF0445, Monthly Submission Forms (January - December

2019)

Unplanned Scrams/Complications, QF0445, Monthly 14

Submission Forms (January - December 2019)

71152 Corrective Action 501000029837 V-EAC-14B Compressor Trip on Startup 0

Documents 501000023730 Heating Boiler Lockout 0

501000030237 CRDs Refurbished Without AMSE XI RR Plan 0

501000031053 ESW-1-2 IST Test not Performed in 1R29 0

501000031071 Trend in Outage Activity Closure 0

501000032534 V-EAC-14B Compressor Tripped During Swap 0

501000033437 P-76A Unusually Noisy & HTB Trip 0

501000033517 Heating Boiler Lockouts 0

501000034054 Abnormal Trend In Heating Boiler Trips 0

501000036107 Heating Boiler Trip 0

501000036132 Loss of Heating Boiler Enhancements 0

Procedures B.08.07-05 Operations Manual System Operation, Heating and 65

Ventilating

C.B.08.03.A Operations Manual Abnormal Procedure, Loss of Heating 21

Boiler

71153 Corrective Action 501000037884 Becker Recycling Facility Fire 0

Documents

Procedures 5790-101-02 Emergency Action Level Matrix 13

13