IR 05000282/2020003
| ML20315A429 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 11/10/2020 |
| From: | Hironori Peterson Region 3 Branch 3 |
| To: | Domingos C Northern States Power Company, Minnesota |
| References | |
| IR 2020002, IR 2020003 | |
| Download: ML20315A429 (15) | |
Text
November 10, 2020
SUBJECT:
PRAIRIE ISLAND NUCLEAR GENERATING PLANT - INTEGRATED INSPECTION REPORT 05000282/2020003; 05000306/2020003; AND 07200010/2020002
Dear Mr. Domingos:
On September 30, 2020, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Prairie Island Nuclear Generating Plant. On October 8, 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; 05000306;
and 07200010 License Nos. DPR-42; DPR-60;
and SNM-2506
Enclosure:
As stated
Inspection Report
Docket Numbers:
05000282; 05000306; and 07200010
License Numbers:
Report Numbers:
05000282/2020003; 05000306/2020003; and 07200010/2020002
Enterprise Identifier: I-2020-003-0034 and I-2020-002-0101
Licensee:
Northern States Power Company
Facility:
Prairie Island Nuclear Generating Plant
Location:
Welch, MN
Inspection Dates:
July 01, 2020 to September 30, 2020
Inspectors:
S. Bell, Health Physicist
R. Edwards, Senior Health Physicist
L. Haeg, Senior Resident Inspector
K. Pusateri, Resident Inspector
D. Tesar, Resident 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
Unit 1 operated at or near 100 percent power, with the exception of brief power reductions to support flexible power operations until August 20, 2020, when cycle coastdown to the 1R32 refueling outage began. The Unit 1 reactor tripped from ~95 percent power on August 26, 2020, and was returned to ~95 percent power on September 2, 2020. On September 18, 2020, Unit 1 was shutdown for 1R32 and remained shutdown through the end of the inspection period.
Unit 2 operated at or near 100 percent power for the duration of the inspection period with the exception of brief power reductions to support 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/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.
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; observed risk significant activities, and completed on-site portions of IPs. In addition, resident and regional baseline inspections were evaluated to determine if all or a 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 some cases, portions of an IP were completed remotely and on-site. The inspections documented below met the objectives and requirements for completion of the IP.
REACTOR SAFETY
71111.01 - Adverse Weather Protection
Seasonal Extreme Weather Sample (IP Section 03.01) (1 Sample)
- (1) The inspectors evaluated readiness for seasonal extreme weather conditions prior to the onset of seasonal hot temperatures for the offsite and onsite AC power systems on 07/06/2020.
71111.04 - Equipment Alignment
Partial Walkdown Sample (IP Section 03.01) (4 Samples)
The inspectors evaluated system configurations during partial walkdowns of the following systems/trains:
- (1) A train cooling water strainers on 08/13/2020 (2)12 motor-driven auxiliary feedwater pump on 08/25/2020 (3)11 turbine-driven auxiliary feedwater pump on 08/09/2020
- (4) Unit 1 A train emergency core cooling systems with Unit 1 B train emergency core cooling systems out of service on 09/30/2020
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 area 41A, Diesel-driven cooling water pump rooms on 07/28/2020
- (2) Fire area 34, 12 battery room on 07/30/2020
- (3) Fire area 31, A train hot shutdown panel area on 08/07/2020
- (4) Fire area 58, Auxiliary building on 08/04/2020
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) Plant screenhouse on 08/19/2020
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) Operator performance during forced outage on 08/30/2020
Licensed Operator Requalification Training/Examinations (IP Section 03.02) (1 Sample)
- (1) Operator outage just-in-time training on 09/16/2020
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) AR 501000042699; Potential Adverse Trend in Packing Replacements on 07/31/2020
- (2) Steam generator power operated relief valve controller issue on 08/10/2020
71111.13 - Maintenance Risk Assessments and Emergent Work Control
Risk Assessment and Management Sample (IP Section 03.01) (4 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 new fuel receipt (work week 2029) on 07/21/2020
- (2) AR 501000042623; Possible Pinhole Leak on CL-37-1 on 07/25/2020
- (3) Maintenance risk (work week 2032) on 08/07/2020
- (4) Maintenance risk during Bus 16 modifications and 12 battery charger work on 08/20/2020
71111.15 - Operability Determinations and Functionality Assessments
Operability Determination or Functionality Assessment (IP Section 03.01) (3 Samples)
The inspectors evaluated the licensee's justifications and actions associated with the following operability determinations and functionality assessments:
- (1) Steam generator power operated relief valves on 07/22/2020 (2)11 turbine-driven auxiliary feedwater pump on 07/13/2020
- (3) AR 501000043114; MIC: Unacceptable Wall Thinning Detected on 08/10/2020
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) Modification process for FLEX equipment on 07/01/2020
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) SP 2305; D6 Monthly Slow Start on 07/20/2020
- (2) Testing of 1A safety injection system following planned maintenance on 08/05/2020
- (3) Testing of 1A residual heat removal system following planned maintenance on 08/06/2020
- (4) Testing of 122 control room chiller following planned maintenance on 08/17/2020
- (5) Local leak rate testing following valve repairs on 09/29/2020
71111.20 - Refueling and Other Outage Activities
Refueling/Other Outage Sample (IP Section 03.01) (1 Sample)
- (1) Unit 1 refueling outage 32 beginning on 09/18/2020
71111.22 - Surveillance Testing
The inspectors evaluated the following surveillance tests:
Surveillance Tests (other) (IP Section 03.01)
- (1) SP 1213; Inadequate Core Cooling Monitor on 08/04/2020
- (2) SP 2305; D6 Monthly Slow Start on 07/20/2020
Inservice Testing (IP Section 03.01) (1 Sample)
Containment Isolation Valve Testing (IP Section 03.01) (1 Sample)
- (1) MV-32075 local leak rate test on 10/06/2020
FLEX Testing (IP Section 03.02) (1 Sample)
- (1) 122 FLEX submersible pump testing on 8/10/2020
RADIATION SAFETY
71124.03 - In-Plant Airborne Radioactivity Control and Mitigation
Use of Respiratory Protection Devices (IP Section 03.03) (1 Sample)
- (1) The inspectors evaluated the licensees use of respiratory protection devices.
Self-Contained Breathing Apparatus for Emergency Use (IP Section 03.04) (1 Sample)
- (1) The inspectors evaluated the licensees use and maintenance of self-contained breathing apparatuses.
71124.04 - Occupational Dose Assessment
Source Term Characterization (IP Section 03.01) (1 Sample)
- (1) The inspectors evaluated licensee performance as it pertains to radioactive source term characterization.
External Dosimetry (IP Section 03.02) (1 Sample)
- (1) The inspectors evaluated licensee performance as it pertains to external dosimetry that is used to assign occupational dose.
Internal Dosimetry (IP Section 03.03) (1 Sample)
The inspectors evaluated the following internal dose assessments for actual internal exposures:
- (1) Internal dose assessment for an individual who had performed maintenance activities in the chemistry laboratory (715' auxiliary building) on 4/23/2020
71124.07 - Radiological Environmental Monitoring Program
Radiological Environmental Monitoring Program (IP Section 03.02) (1 Sample)
- (1) The inspectors evaluated the implementation of the licensees radiological environmental monitoring program.
GPI Implementation (IP Section 03.03) (1 Sample)
- (1) The inspectors evaluated the licensees implementation of the Groundwater Protection Initiative program to identify incomplete or discontinued program elements.
OTHER ACTIVITIES - BASELINE
===71151 - Performance Indicator Verification
The inspectors verified licensee performance indicators submittals listed below:
BI02: RCS Leak Rate Sample (IP Section 02.11)===
- (1) Unit 1 RCS leakage July 1, 2019 through June 30, 2020 on 07/07/2020
- (2) Unit 2 RCS leakage July 1, 2019 through June 30, 2020 on 07/07/2020
PR01: Radiological Effluent Technical Specifications/Offsite Dose Calculation Manual Radiological Effluent Occurrences (RETS/ODCM) Radiological Effluent Occurrences Sample (IP Section 02.16) (1 Sample)
(1)10/01/2019 - 06/30/2020
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:
71153 - Followup of Events and Notices of Enforcement Discretion Event Followup (IP Section 03.01)
- (1) The inspectors evaluated a Unit 1 reactor trip and licensee response on 08/26/2020
OTHER ACTIVITIES
- TEMPORARY INSTRUCTIONS, INFREQUENT AND ABNORMAL
60855.1 - Operation of an Independent Spent Fuel Storage Installation at Operating Plants Operation of an Independent Spent Fuel Storage Installation at Operating Plants
- (1) The inspectors evaluated the licensees activities related to long-term operation and monitoring of their independent spent fuel storage installation. On September 15, 2020, the inspectors toured and evaluated the material and radiological condition of the Independent Spent Fuel Storage Installation (ISFSI). The walkdown of the ISFSI was a continuation of the inspections performed between May 26-29, 2020, which were previously documented in Inspection Report Nos. 05000282/2020002; 05000306/2020002; and 07200010/2020001 (ML20213A880). As documented in these reports, the inspectors were unable to tour the facility in May of 2020 due to the COVID-19 public health emergency.
INSPECTION RESULTS
Observation: Apparent Cause Evaluation for 11 TDAFW Steam Line Drain Blockage 71152 The inspectors reviewed the licensee's apparent cause evaluation associated with the licensee's May 16, 2020, discovery of steam line drain blockage for the 11 TDAFW pump turbine. The condition had the potential to impact the operability of the 11 TDAFW pump and was declared inoperable upon discovery. The inspectors focused on the identified cause, extent of condition/cause, and corrective actions to determine whether the issue was reasonable foreseeable. The inspectors also reviewed the licensee's past operability review that determined that the 11 TDAFW pump remained operable for the condition. Based on the documented historical review of internal and external operating experience, as well as a review of prior corrective action program items that could be associated with this issue, the inspectors assessed that the overall licensee response to the issue was acceptable and no concerns were identified. Additionally, the inspectors did not identify any concerns with the licensee's past operability review and completed and planned corrective actions.
Observation: Unit 1 Reactor Trip on August 26, 2020 71153 The inspectors assessed plant safety and operator performance for a Unit 1 reactor trip on August 26, 2020. During planned surveillance testing of the nuclear instrumentation system, a spurious trip on a power range channel occurred with a separate channel in trip as part of the testing. This resulted in a reactor trip from 100 percent power and subsequent non-emergency event reports to the NRC. The inspectors observed integrated plant response to the trip as well as operator performance to ensure that the reactor was safely shutdown. Further, the inspectors reviewed operator logs and plant computer information to verify that plant systems operated as expected. Overall, the inspectors concluded that the overall response to the trip was acceptable and no concerns with plant or operator performance were identified for this event.
EXIT MEETINGS AND DEBRIEFS
The inspectors verified no proprietary information was retained or documented in this report.
- On August 27, 2020, the inspectors presented the radiation protection baseline inspection results to Mr. S. Sharp, Site Vice President and other members of the licensee staff.
- On September 15, 2020, the inspectors presented the Independent Spent Fuel Storage Installation Inspection results to Ms. P. Johnson, Regulatory Analyst and other members of the licensee staff.
- On October 8, 2020, the inspectors presented the integrated inspection results to Mr. C. Domingos, Site Vice President and other members of the licensee staff.
DOCUMENTS REVIEWED
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
Procedures
C.1.1.18-1
SI, CS, CA, and HC System Checklist Unit 1
Procedures
5AWI 8.9.0
Internal Flooding Drainage Control
MSIP 1089
Removal & Installation of Internal Flood Barriers
SP 1293
Inspection of Flood Control Measures
71111.11Q Procedures
FP-OP-COO-21
Reactivity Control
Procedures
FP-WM-SCH-01
Online Scheduling Process
Corrective Action
Documents
501000041444
Condition Evaluation: Visible Degradation to AFW Piping
08/10/2020
501000042137
045-1302 FLEX DD Sub Pump Hydraulic Leak
08/10/2020
501000043114
MIC: Unacceptable Wall Thinning Detected
08/10/2020
Procedures
SP 1088A
Train A Safety Injection Quarterly Test
SP 1089A
Train A RHR Pump and Suction Valve from RWST Quarterly
Test
Drawings
Fig C1-40
Refueling Water Levels
Miscellaneous
1R32
Unit 1 Refueling Outage (Trn B) Entire Schedule Critical
Path
1R32
1R32 Prairie Island Refueling Outage Sept 2020 Shutdown
Safety Assessment
08/14/2020
Procedures
1C15
Residual Heat Removal System Unit 1
1C4.2
RCS Inventory Control Post Refueling
C19.10
Containment Airlock Door at Shutdown
FP-OP-ROM-02
Shutdown Safety Management Program
FP-OP-RSK-01
Risk Monitoring and Risk Management
Work Orders
700003807-0050
RHR System Valve -Pressure Enclosure Test
10/05/2020
Corrective Action
Documents
501000042479
Cylinder 4B Deviation Alarm for D6
07/20/2020
501000042485
Coolant Leak from D6 E2 LT Sample Point
07/20/2020
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
501000042486
Coolant Leak from D6 E2 HT Sample
07/20/2020
501000042976
ICCM Processor Not Operating Properly
08/06/2020
501000044347
Battery During SP 1083B
09/90/2020
501000044382
SP 1083B - Table 21 D2 Results
09/21/2020
501000044574
Penetration 20 Air Leak on SA-31-133
09/24/2020
501000044583
Clearance Installed While LLRT in Progress
09/24/2020
Corrective Action
Documents
501000007262
Large SCBA Masks Staged vs. Medium
01/15/2018
501000007493
Leak on Fire Brigade SCBA
01/19/2018
501000026889
Filling New SCBA Bottles
05/05/2019
Corrective Action
Documents
Resulting from
Inspection
501000042169
Wrong Revision for Air Sampling
07/10/2020
Miscellaneous
2019 Prairie Island Isotopic Mix Evaluation
Undated
Grade D Air Analysis Tests 2018-2019
Various
CFR 61 Isotopic Analysis Dry Active Waste
09/25/2018
Procedures
AWI 10.1.2
Respirator Qualification Program
H26
Respiratory Protection Program
RPIP 1225
Respirator Fit Testing and Portacount Fit Testing Operation
RPIP1215
Respiratory Equipment and Control
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
Calibration
Records
Whole Body Counter Calibration
08/12/2020
Corrective Action
Documents
501000023766
Dose Discrepancies for Period 3 in 2018
03/04/2019
Engineering
Evaluations
Technical Basis Document,19-003, Units 1 and 2
Containment Neutron Field Evaluation
Miscellaneous
Prairie Island TLD Quality Assurance Irradiation Check
10/03/2019
Dosimetry Discrepancy Investigation for DLR Monitoring
Period 09/01/2018 to 12/31/2018
Undated
Technical Basis Document,17-005, Passive Monitoring
Capability Testing
11/05/2019
Dosimetry Discrepancy Investigation for DLR Monitoring
Period 01/01/2019 to 04/30/2019
Undated
Internal Exposure Investigation for Maintenance Worker
Uptake on 04/23/20
04/23/2020
Calibration
Records
20 REMP Air Sampler Calibrations
04/29/2020
Corrective Action
Documents
501000016625
Meteorological Tower Evaluation Results
09/13/2018
501000018346
Missed REMP Air Sample at P-4
10/10/2018
501000035462
Positive Shoreline Sediment REMP Sample
2/09/2019
501000039114
Offsite Laboratory Shutdown for Coronavirus
03/25/2020
Corrective Action
Documents
Resulting from
Inspection
501000042328
Onsite Groundwater Well Sampling
07/15/2020
Miscellaneous
2019 Annual Radiological Environmental Monitoring
Program Report
5/13/2020
2018 Annual Radiological Environmental Monitoring
Program Report
05/14/2019
2019 Land Use Census
09/13/2019
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
EPRI Groundwater Protection Program Report
08/2017
Work Orders
700051329
Meteorological Instrumentation Calibration
09/19/2019
700053982
Meteorological Tower Vegetation Evaluation
09/11/2019
71151
Miscellaneous
Radioactive Gaseous and Liquid Effluent Release Data from
October 1, 2019 through June 30, 2020
Various
Units 1 & 2 Daily RCS Unidentified Leakage Logs from
July of 2019 through June of 2020