IR 05000282/2020003

Integrated Inspection Report 05000282/2020003; 05000306/2020003; and 07200010/2020002

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: DPR-42; DPR-60; and SNM-2506 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 Enclosure

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.

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)

(1) SP 1083B; Integrated SI Test on 09/20/2020

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

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:

(1) AR 501000040752; 5 DPM Water Drip from 11 TDAFWP CV Stem on 07/25/2020

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 71152 Blockage 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 Type Designation Description or Title Revision or

Procedure Date

71111.04 Procedures C.1.1.18-1 SI, CS, CA, and HC System Checklist Unit 1 56

71111.06 Procedures 5AWI 8.9.0 Internal Flooding Drainage Control 22

MSIP 1089 Removal & Installation of Internal Flood Barriers 0

SP 1293 Inspection of Flood Control Measures 27

71111.11Q Procedures FP-OP-COO-21 Reactivity Control 9

71111.12 Procedures FP-WM-SCH-01 Online Scheduling Process 23

71111.15 Corrective Action AR Condition Evaluation: Visible Degradation to AFW Piping 08/10/2020

Documents 501000041444

AR 045-1302 FLEX DD Sub Pump Hydraulic Leak 08/10/2020

501000042137

AR MIC: Unacceptable Wall Thinning Detected 08/10/2020

501000043114

71111.19 Procedures SP 1088A Train A Safety Injection Quarterly Test 34

SP 1089A Train A RHR Pump and Suction Valve from RWST Quarterly 32

Test

71111.20 Drawings Fig C1-40 Refueling Water Levels 5

Miscellaneous 1R32 Unit 1 Refueling Outage (Trn B) Entire Schedule Critical 0

Path

1R32 1R32 Prairie Island Refueling Outage Sept 2020 Shutdown 08/14/2020

Safety Assessment

Procedures 1C15 Residual Heat Removal System Unit 1 53

1C4.2 RCS Inventory Control Post Refueling 43

C19.10 Containment Airlock Door at Shutdown 30

FP-OP-ROM-02 Shutdown Safety Management Program 13

FP-OP-RSK-01 Risk Monitoring and Risk Management 12

Work Orders 700003807-0050 RHR System Valve -Pressure Enclosure Test 10/05/2020

71111.22 Corrective Action AR Cylinder 4B Deviation Alarm for D6 07/20/2020

Documents 501000042479

AR Coolant Leak from D6 E2 LT Sample Point 07/20/2020

501000042485

Inspection Type Designation Description or Title Revision or

Procedure Date

AR Coolant Leak from D6 E2 HT Sample 07/20/2020

501000042486

AR ICCM Processor Not Operating Properly 08/06/2020

501000042976

AR 12 Battery During SP 1083B 09/90/2020

501000044347

AR SP 1083B - Table 21 D2 Results 09/21/2020

501000044382

AR Penetration 20 Air Leak on SA-31-133 09/24/2020

501000044574

AR Clearance Installed While LLRT in Progress 09/24/2020

501000044583

71124.03 Corrective Action AR Large SCBA Masks Staged vs. Medium 01/15/2018

Documents 501000007262

AR Leak on Fire Brigade SCBA 01/19/2018

501000007493

AR Filling New SCBA Bottles 05/05/2019

501000026889

Corrective Action AR Wrong Revision for Air Sampling 07/10/2020

Documents 501000042169

Resulting from

Inspection

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 5 AWI 10.1.2 Respirator Qualification Program 8

H26 Respiratory Protection Program 17

RPIP 1225 Respirator Fit Testing and Portacount Fit Testing Operation 23

RPIP1215 Respiratory Equipment and Control 13

Inspection Type Designation Description or Title Revision or

Procedure Date

71124.04 Calibration Whole Body Counter Calibration 08/12/2020

Records

Corrective Action AR Dose Discrepancies for Period 3 in 2018 03/04/2019

Documents 501000023766

Engineering Technical Basis Document,19-003, Units 1 and 2 0

Evaluations Containment Neutron Field Evaluation

Miscellaneous Prairie Island TLD Quality Assurance Irradiation Check 10/03/2019

Dosimetry Discrepancy Investigation for DLR Monitoring Undated

Period 09/01/2018 to 12/31/2018

Technical Basis Document,17-005, Passive Monitoring 11/05/2019

Capability Testing

Dosimetry Discrepancy Investigation for DLR Monitoring Undated

Period 01/01/2019 to 04/30/2019

Internal Exposure Investigation for Maintenance Worker 04/23/2020

Uptake on 04/23/20

71124.07 Calibration 2020 REMP Air Sampler Calibrations 04/29/2020

Records

Corrective Action AR Meteorological Tower Evaluation Results 09/13/2018

Documents 501000016625

AR Missed REMP Air Sample at P-4 10/10/2018

501000018346

AR Positive Shoreline Sediment REMP Sample 12/09/2019

501000035462

AR Offsite Laboratory Shutdown for Coronavirus 03/25/2020

501000039114

Corrective Action AR Onsite Groundwater Well Sampling 07/15/2020

Documents 501000042328

Resulting from

Inspection

Miscellaneous 2019 Annual Radiological Environmental Monitoring 5/13/2020

Program Report

2018 Annual Radiological Environmental Monitoring 05/14/2019

Program Report

2019 Land Use Census 09/13/2019

Inspection Type Designation Description or Title Revision or

Procedure 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 Various

October 1, 2019 through June 30, 2020

Units 1 & 2 Daily RCS Unidentified Leakage Logs from

July of 2019 through June of 2020

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