IR 05000282/2020001
| ML20119A899 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 04/28/2020 |
| From: | Hironori Peterson Region 3 Branch 3 |
| To: | Sharp S Northern States Power Co |
| References | |
| IR 2020001 | |
| Download: ML20119A899 (13) | |
Text
April 28, 2020
SUBJECT:
PRAIRIE ISLAND NUCLEAR GENERATING PLANT - INTEGRATED INSPECTION REPORT 05000282/2020001 AND 05000306/2020001
Dear Mr. Sharp:
On March 31, 2020, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Prairie Island Nuclear Generating Plant. On April 9, 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 Nos. 05000282 and 05000306 License Nos. DPR-42 and DPR-60
Enclosure:
As stated
Inspection Report
Docket Numbers:
05000282 and 05000306
License Numbers:
Report Numbers:
05000282/2020001 and 05000306/2020001
Enterprise Identifier: I-2020-001-0052
Licensee:
Northern States Power Company, Minnesota
Facility:
Prairie Island Nuclear Generating Plant
Location:
Welch, Minnesota
Inspection Dates:
January 01, 2020 to March 31, 2020
Inspectors:
E. Fernandez, Reactor Inspector
L. Haeg, Senior Resident Inspector
I. Hafeez, Reactor Inspector
K. Pusateri, Resident Inspector
L. Rodriguez, Reactor Inspector
Approved By:
Hironori Peterson, Chief
Branch 3
Division of Reactor Projects
SUMMARY
The U.S. Nuclear Regulatory Commission (NRC) continued monitoring the licensees performance by conducting an integrated inspection at Prairie Island 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
Units 1 and 2 operated at or near full power for the entirety of the inspection period, with the exception of brief power reductions to perform surveillance testing or flexible power operations.
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.
REACTOR SAFETY
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 severe weather (heavy snow storm) on 01/15/2020
External Flooding Sample (IP Section 03.03) (1 Sample)
- (1) The inspectors evaluated flood protection barriers, mitigation plans, procedures, and equipment are consistent with the licensees design requirements and risk analysis assumptions for coping with external flooding on 03/09/2020
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)122 control room chiller on 01/15/2010
- (2) D5 and Bus 25 during D6 maintenance window on 01/23/2020 (3)11 containment spray pump with 12 containment spray out of service for surveillance test on 02/20/2020
Complete Walkdown Sample (IP Section 03.02) (1 Sample)
- (1) The inspectors evaluated system configurations during a complete walkdown of the D1 and D2 emergency diesel generators on 01/30/2020
71111.05 - Fire Protection
Fire Area Walkdown and Inspection Sample (IP Section 03.01) (4 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) Fire detection zone 89: guard house and emergency generator building on 01/10/2020
- (2) Fire detection zone 87: unit 1 rod drive room on 01/13/2010
- (3) Fire detection zone 75: Plant screenhouse safeguards traveling screens during hotwork on 02/05/2020
- (4) Fire detection zone 11: Unit 1 safeguards Bus 15 room on 01/25/2020
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) Auxiliary building and postulated internal flood analysis on 01/17/2020
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 during Unit 1 main feedwater leading-edge flowmeter troubleshooting on 03/02/2020
Licensed Operator Requalification Training/Examinations (IP Section 03.02) (1 Sample)
- (1) The inspectors observed and evaluated operator re-qualification training in the control room simulator on 03/13/2020
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) Motor-operated valve program deferrals on 01/27/2020
- (2) Maintenance effectiveness procedure use and adherence on 02/28/2020
71111.13 - Maintenance Risk Assessments and Emergent Work Control
Risk Assessment and Management Sample (IP Section 03.01) (3 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) Maintenance risk during D6 maintenance window on 01/21/2020
- (2) Bus 26 load sequencer unplanned LCO on 01/24/2020 (3)22 component cooling pump emergent outboard beaming maintenance on 02/24/2020
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) D1 air start issue Part 21 review on 01/21/2020
- (2) Bus 26 breaker 26-16 incorrect breaker sizing past operability on 01/27/2020
- (3) Steam generator vendor weld qualification issue (AR 501000036873) on 01/29/2020
- (4) Cooling water through-wall leak (AR 501000036454) on 02/05/2020 (5)122 fuel oil storage tank pump motor cable low insulation resistance issue (AR 501000038846) on 3/20/2020
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) D5/D6 fuel oil day tank volume change (EC 601000000142) on 01/09/2020
71111.19 - Post-Maintenance Testing
Post-Maintenance Test Sample (IP Section 03.01) (5 Samples)
The inspectors evaluated the following post maintenance test activities to verify system operability and functionality:
(1)22 turbine driven auxiliary feed water pump following maintenance on 01/17/2020
- (2) D6 following maintenance on 01/27/2020 (3)21 fan coil unit following breaker troubleshooting (WO 700070246) on 02/07/2020 (4)12 diesel driven cooling water pump following instrument calibrations on 03/04/2020 (5)22 diesel-driven cooling water pump following maintenance on 03/16/2020
71111.22 - Surveillance Testing
The inspectors evaluated the following surveillance tests:
Surveillance Tests (other) (IP Section 03.01)
- (1) SP 1093; D1 Diesel Generator Monthly Slow Start Test on 01/13/2020
- (2) SP 1106B; 22 Diesel Cooling Water Pump Monthly Test on 01/30/2020
- (3) SP 1295; D1 Diesel Generator 6-month Fast Start Test on 03/09/2020
Inservice Testing (IP Section 03.01) (1 Sample)
- (1) SP 2089B; 21 RHR Pump and Suction Valve from the Reactor Water Storage Tank Quarterly Test on 03/30/2020
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 1Q19 through 4Q19 on 01/08/2020
- (2) Unit 2 1Q19 through 4Q19 on 01/08/2020
IE03: Unplanned Power Changes per 7000 Critical Hours Sample (IP Section 02.02) (2 Samples)
- (1) Unit 1 1Q19 through 4Q19 on 01/10/2020
- (2) Unit 2 1Q19 through 4Q19 on 01/10/2020
IE04: Unplanned Scrams with Complications (USwC) Sample (IP Section 02.03) (2 Samples)
- (1) Unit 2 1Q19 through 4Q19 on 01/09/2020
- (2) Unit 1 1Q19 through 4Q19 on 01/09/2020
MS05: Safety System Functional Failures (SSFFs) Sample (IP Section 02.04) (2 Samples)
- (1) Unit 1 1Q19 through 4Q19 on 01/13/2020
- (2) Unit 2 1Q19 through 4Q19 on 01/13/2020
71152 - Problem Identification and Resolution
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) D5/D6 emergency diesel generator extreme cold performance reconstitution effort on 01/07/2020
INSPECTION RESULTS
Observation: D5/D6 emergency diesel generator extreme cold weather evaluation 71152 The inspectors reviewed the licensee's efforts to re-evaluate extreme cold weather performance and operability limits for the Unit 2 D5 and D6 emergency diesel generators.
This effort was in response to extreme cold weather that occurred in late-January of 2019; challenging operability of the D5 and D6 systems.
The inspector's review consisted of analyses and calculations performed by a vendor to demonstrate lower temperature limits from existing values. The inspectors also reviewed the method for incorporating information for plant operators if/when extreme cold weather was experienced in the future. Based on the inspector's review, no concerns were identified.
EXIT MEETINGS AND DEBRIEFS
The inspectors verified no proprietary information was retained or documented in this report.
- On April 9, 2020, the inspectors presented the integrated inspection results to Mr. S. Sharp, Site Vice President, and other members of the licensee staff.
DOCUMENTS REVIEWED
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
Procedures
AB-2
Severe Weather
AB-4
Flood
Calculations
NL-40960-2A
D1 and D2 Emergency Generator Governor Full Load
Position Indicator Microswitch Mounting
11/27/1972
Corrective Action
Documents
501000018362
D1 Governor Ready Lights Not Responding
10/12/2018
501000019870
D1 Governor Ready Lights Not Lit
11/14/2018
501000032206
21 CR Chiller Purge Unit Rusting
10/24/2019
501000032206
21 CR Chiller Purge Unit Rusting
09/22/2019
501000036567
21 Control Room Chiller Purge Unit
01/16/2020
501000036690
Surface Rust on the Base Plate-Excessive Leakage During
TP 1687
01/17/2020
501000037469
D1 Governor Ready Lights Not Lit
2/10/2020
Corrective Action
Documents
Resulting from
Inspection
500001011327
NRC Identified Concerns With D1/D2 Operability
03/29/2006
501000038509
Fuel Oil Leak on D2 FO Pump Discharge
03/09/2020
Drawings
NE-40006-1
4160V Switchgear Safeguard Unit 1 and 2 - Schematic
Diagram
08/18/1994
NF-39603-4
Flow Diagrams - Cooling and Chilled Water System and Fire
Protection for Vent Filters in Auxiliary and Containment
Buildings
NF-40325-1
Interlock Logic Diagram Diesel Generator System Units 1
and 2: D1 Diesel Generator Voltage Regulator Control Logic
Procedures
C1.1.20.7-6
D2 Diesel Generator Auxiliaries and Room Cooling Local
Panels
C1.1.20.7-8
D2 Diesel Generator Circuit Breakers and Panel Switches
IC20.7
D1/D2 Diesel Generators
SP 1295
D1 Diesel Generator 6-Month Fast Start Test
SP 1305
D2 Diesel Generator Monthly Slow Start Test
Fire Plans
Fire Detection
Zone 11-F5
Appendix A
Fire Detection Zone 11 - Fire Areas 20 and 81;
Cables/Miscellaneous
Fire Detection
Zone 75-F5
Appendix A
Fire Detection Zone 75 - Fire Areas 41 and 41A - Open
Areas From Elevation 670'
Fire Detection
Zone 87
Unit 1 Rod Drive Room
Fire Detection
Zone 89
Guard House and Emergency Generating Building
Calculations
ENG-ME-448
Auxiliary Building Flooding Analysis
71111.11Q Miscellaneous
Simulator
Exercise Guide
PI-LOR-20C-
2S
Cycle 20C Simulator Session #2
Procedures
501000038248
LEFM Behavior During Flex Ops
03/01/2020
Corrective Action
Documents
501000035269
Algae in Sightglass to 2CL-128-6
2/03/2019
501000036851
MOV Program Health Color Change
01/22/2020
501000037993
CC Pump Outboard Bearing Oil Leak
2/22/2020
501000038128
Corporate Elevation: VM WO Preps / Exec
2/27/2020
501000038128
Elevation / Escalation Letter Template
2/27/2020
501000038129
Potential Trend in Procedure Use and ADH
2/27/2020
Drawings
NF-39216-1
Flow Diagram Cooling Water Screenhouse Units 1 and 2
04/11/2007
XH-1048-5
- 10096 "CPK" Heat Exchanger 5-046-10-096-005
Miscellaneous
X-HIAW-48-34
Lubrication System and Piping Detail for 200L-26
D
Procedures
ICPM 2-063-22
DD Clg Water Pump Bearing Water Pressure Switch
Calibration
Work Orders
0010
Replace DDCLP Heat Exchanger O-Rings
11/08/2018
20
Olg Water Pump Diesel Jacket Heat Exchanger
11/17/2018
Corrective Action
Documents
501000036964
Unsatisfactory SP 2095, Bus 26 Sequencer, Error 11
01/24/2020
501000036976
Breaker 29-16 Charging Motor Wire Issue
01/26/2020
501000037073
D6 Lessons Learned-SP 2095 Schedule
01/27/2020
501000037074
D6 Lessons Learned-PMT Sequence
01/27/2020
501000037078
D6 Lessons Learned PMT & RTS Work Plans
01/28/2020
501000037079
D6 Lessons Learned-PMT Quality Issue
01/28/2020
501000037993
CC Pump Outboard Bearing Oil Leak
2/22/2020
501000038027
CC Pump Vibes Step Change
2/25/2020
Drawings
XH-105-1
Component Cooling Water Pump Section Drawing
Procedures
2C20.7 AOP3
Bus 26 Load Sequencer Out of Service
SP 2155B
CC System Quarterly Test Train B - 22 CC Pump and Motor
Vibration Data
Work Orders
0010
Replace 22 CC Pump Outboard Seal and Bearings
Corrective Action
Documents
501000036454
Clg Water Thru Well Drip 3-CL-88
01/10/2020
501000036873
Framatome Additional SG Welding Issues
01/23/2020
501000036932
Breaker 26-16 Found Wrong Frame Size
01/24/2020
501000038846
Low Megger: 122 FOST PMP MTR PE4826
03/17/2020
Drawings
NE-40006 Sheet
MDAFWP-Auxiliary Feedwater Pump Bus 16 Cub 3
Corrective Action
Documents
501000036878
D6 Cracked Flame Arrestor Relocation
01/23/2020
501000036884
D6 Day TK Flame Arrestor Flange Cracked
01/23/2020
Procedures
601000000142
D5/D6 Fuel Oil Day Tank Volume Change
Procedures
ICPM 1-012A
Diesel Cooling Water Pump Instrument Calibration - Part
A
SP 2307
D6 Diesel Generator 6-Month Fast Start Test
Work Orders
0010
Perform PE MCC-G7 on Breaker 212J-2
2/06/2020
Procedures
SP 1106B
Diesel Cooling Water Pump Monthly Test
98