Text

Integrated Inspection Report 05000413/2021003 and 05000414/2021003
	ML21301A063
Person / Time
Site:	Catawba
Issue date:	10/28/2021
From:	Eric Stamm; NRC/RGN-II/DRP/RPB1
To:	Simril T; Duke Energy Carolinas
References
	IR 2021003
	Download: ML21301A063 (12)
	v • d • e

October 28, 2021

SUBJECT:

CATAWBA NUCLEAR STATION - INTEGRATED INSPECTION REPORT 05000413/2021003 AND 05000414/2021003

Dear Mr. Simril:

On September 30, 2021, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Catawba Nuclear Station. On October 25, 2021, 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/

Eric J. Stamm, Chief Reactor Projects Branch 1 Division of Reactor Projects Docket Nos. 05000413 and 05000414 License Nos. NPF-35 and NPF-52

Enclosure:

As stated

Inspection Report

Docket Numbers: 05000413 and 05000414 License Numbers: NPF-35 and NPF-52 Report Numbers: 05000413/2021003 and 05000414/2021003 Enterprise Identifier: I-2021-003-0029 Licensee: Duke Energy Carolinas, LLC Facility: Catawba Nuclear Station Location: York, South Carolina Inspection Dates: July 01, 2021 to September 30, 2021 Inspectors: J. Austin, Senior Resident Inspector D. Rivard, Acting Resident Inspector C. Fontana, Emergency Preparedness Inspector S. Sanchez, Senior Emergency Preparedness Inspector J. Walker, Emergency Response Inspector Approved By: Eric J. Stamm, Chief Reactor Projects Branch 1 Division of Reactor Projects Enclosure

SUMMARY The U.S. Nuclear Regulatory Commission (NRC) continued monitoring the licensees performance by conducting an integrated inspection at Catawba Nuclear Station, 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 Type Issue Number Title Report Section Status LER 05000414/2021-002-00 Valid Actuation of the Unit 2 71153 Closed Reactor Protection System and Auxiliary Feedwater System

PLANT STATUS Unit 1 began the inspection period at or near 100 percent rated thermal power (RTP). It was reduced to 15 percent RTP on August 27, 2021, to replace the main generator links. On August 30, 2021, Unit 1 was returned to 100 percent RTP and remained at or near 100 percent RTP for the remainder of the inspection period.

Unit 2 began the inspection period at or near 100 percent RTP. It was reduced to 18 percent RTP on July 30, 2021, to stop a steam leak on steam generator shell side alternate sample valve 2BB-1. Unit 2 was returned to 100 percent RTP on July 31, 2021, and remained at or near 100 percent RTP for the remainder of the inspection period.

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 and regional 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, increasing the amount of time on site as local COVID-19 conditions permitted.

As part of their onsite activities, resident inspectors 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 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 conditions associated with Tropical Storm Elsa on July 8, 2021.

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) Unit 1 outside doghouse (main steam/feed penetration room) on July 19, 2021 (2) 1A and 2B emergency diesel generators on July 22, 2021 (3) Units 1 and 2 service water pump house on July 23, 2021 Complete Walkdown Sample (IP Section 03.02) (2 Samples)

(1) The inspectors evaluated system configuration during a complete walkdown of the Unit 1A emergency diesel generator system on July 23, 2021.

(2) The inspectors evaluated system configuration during a complete walkdown of the safe shutdown facility (SSF) diesel generator and support systems on September 21, 2021.

71111.05 - Fire Protection Fire Area Walkdown and Inspection Sample (IP Section 03.01) (7 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) Unit 1, Turbine Building, Elev. 568, Basement, SE Quadrant on September 21, 2021 (2) Unit 1, Turbine Building, Elev. 568, Basement, NE Quadrant on September 21, 2021 (3) Unit 1, Turbine Building, Elev. 568, Basement, NW Quadrant on September 21, 2021 (4) Unit 1, Turbine Building, Elev. 568, Basement, SW Quadrant on September 21, 2021 (5) Protected Area South, Standby Shutdown Facility, Elev. 594, Building 7748 on September 21, 2021 (6) Unit 2, Turbine Building, Elev. 568, Basement, NW Quadrant on September 23, 2021 (7) Unit 2, Turbine Building, Elev. 568, Basement, SW Quadrant on September 23, 2021 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) Work request (WR) 20209964, 2A emergency diesel generator (EDG) sequencer hallway water leak above 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 the Unit 1 power increase on August 30, 2021, following down power to repair main generator flexible links.

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

(1) The inspectors observed and evaluated simulator scenario recorded on July 28, 2021, which contained failure of pressurizer spray valve, seal injection flow control valve, control rod failure, reactor trip, loss of coolant accident (LOCA) from residual heat removal (RHR) and LOCA outside containment.

71111.12 - Maintenance Effectiveness Maintenance Effectiveness (IP Section 03.01) (4 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) WR 20204373, water dripping from overhead in 2A EDG sequencer hallway, on June 29, 2021 (2) WR 20204789, seismic alarm will not clear for control room indications, on July 4, 2021 (3) Nuclear condition report (NCR) 2392855, sump pump conditions, on August 9, 2021 (4) NCR 2393943, longstanding equipment issue for Unit 1 steam dumps, on August 16, 2021 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) 2A service water pump out of service (OOS) for maintenance, on July 6, 2021 (2) 2A service water pump OOS for maintenance, on July 7, 2021 (3) 2A EDG OOS for scheduled maintenance, on August 5, 2021 (4) Unit 1 power reduction to repair main generator flexible links, on August 26, 2021 (5) SSF diesel generator OOS for unscheduled maintenance, on September 13, 2021 71111.15 - Operability Determinations and Functionality Assessments Operability Determination or Functionality Assessment (IP Section 03.01) (6 Samples)

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

(1) NCR 2384415, B train component cooling miniflow valve failed low, on June 1, 2021 (2) NCR 2388448, 2B EDG lube oil inlet/outlet low temperature alarm, on July 5, 2021 (3) NCR 2388798, 2A service water motor offline electrical test incomplete, on July 7, 2021

(4) NCR 2390752, repair pinhole leaks on downstream weld of 2RN-190B, on July 22, 2021 (5) NCR 2393733, 1A EDG sensor fault, on August 14, 2021 (6) NCR 2393733, 1A EDG sensor fault indication for engine lube oil channel on, August 16, 2021 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) Engineering change (EC) 419999, single piece flat washer for main generator flexible link connection, on August 27, 2021 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) WR 20205613, flushed sample line following EMF52 loss of flow alarms, on July 16, 2021 (2) Work Order (WO) 20402161, electronic software reset to reset/resolve 1A reactor vessel level instrument inoperability, on July 29, 2021 (3) WO 20484700, repaired leak on 2A EDG cylinder head jumper pipe and verified the leak was repaired, on August 7, 2021 (4) WR 20208313, replaced relay following the 2YV containment chilled water chiller to start, on August 28, 2021 (5) WO 20487506, performed thermography following repair/replacement of U1 main generator flex links and load placed on main generator, on August 30, 2021 (6) WO 20491701, retest SSF frequency control following troubleshooting of non-responsiveness, on September 13, 2021 71111.22 - Surveillance Testing The inspectors evaluated the following surveillance tests:

Surveillance Tests (other) (IP Section 03.01) (2 Samples)

(1) PT/2/A/4350/002B, 2B EDG operability test, on July 24, 2021 (2) PT/1A/4600/002A, Mode 1 periodic surveillance items performed, on August 17, 2021 Inservice Testing (IP Section 03.01) (1 Sample)

(1) PT/1/A/4250/003C, turbine driven auxiliary feedwater pump #1 performance test, on September 10, 2021

RCS Leakage Detection Testing (IP Section 03.01) (1 Sample)

(1) PT/1/A/4150/001D, reactor coolant system leakage calculation performed, on August 9, 2021 FLEX Testing (IP Section 03.02) (1 Sample)

(1) WO 20470816, reviewed results of Catawba Nuclear Station quarterly FLEX equipment inspection conducted, on August 9, 2021 71114.02 - Alert and Notification System Testing Inspection Review (IP Section 02.01-02.04) (1 Sample)

(1) The inspectors evaluated the maintenance and testing of the alert and notification system during the week of August 23, 2021.

71114.03 - Emergency Response Organization Staffing and Augmentation System Inspection Review (IP Section 02.01-02.02) (1 Sample)

(1) The inspectors evaluated the readiness of the Emergency Response Organization during the week of August 23, 2021.

71114.04 - Emergency Action Level and Emergency Plan Changes Inspection Review (IP Section 02.01-02.03) (1 Sample)

(1) The inspectors evaluated submitted Emergency Action Level, Emergency Plan, and Emergency Plan Implementing Procedure changes during the week of August 23, 2021. This evaluation does not constitute NRC approval.

71114.05 - Maintenance of Emergency Preparedness Inspection Review (IP Section 02.01 - 02.11) (1 Sample)

(1) The inspectors evaluated the maintenance of the emergency preparedness program during the week of August 23, 2021.

71114.06 - Drill Evaluation Select Emergency Preparedness Drills and/or Training for Observation (IP Section 03.01) (1 Sample)

(1) The inspectors evaluated a drill scenario which simulated loss of component cooling, loss of charging, turbine load rejection, tornado on site, safety injection actuation, and reactor trip, on September 27, 2021.

OTHER ACTIVITIES - BASELINE 71151 - Performance Indicator Verification The inspectors verified licensee performance indicators submittals listed below:

IE03: Unplanned Power Changes per 7000 Critical Hours Sample (IP Section 02.02) (2 Samples)