IR 05000413/2022004

Integrated Inspection Report 05000413/2022004 and 05000414/2022004

ML23030B846
Person / Time
Site:	Catawba
Issue date:	01/31/2023
From:	Eric Stamm NRC/RGN-II/DRP/RPB1
To:	Flippin N Duke Energy Carolinas
References
IR 2022004
Download: ML23030B846 (11)

Text

January 31, 2023

SUBJECT:

CATAWBA NUCLEAR STATION - INTEGRATED INSPECTION REPORT 05000413/2022004 AND 05000414/2022004

Dear Nicole Flippin:

On December 31, 2022, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Catawba Nuclear Station. On January 18, 2023, 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, 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:

05000413/2022004 and 05000414/2022004

Enterprise Identifier:

I-2022-004-0015

Licensee:

Duke Energy Carolinas, LLC

Facility:

Catawba Nuclear Station

Location:

York, South Carolina

Inspection Dates:

October 1, 2022, to December 31, 2022

Inspectors:

C. Smith, Senior Resident Inspector (Acting)

D. Rivard, Resident Inspector

J. Austin, Senior Project Engineer

B. Bishop, Senior Project Engineer

S. Lichvar, Project Engineer

M. Riley, Senior Project Engineer

J. Viera, Senior Operations Engineer

Approved By:

Eric J. Stamm, Chief

Reactor Projects Branch 1

Division of Reactor Projects

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 05000413/2021-005-00 Catawba Nuclear Station,

Unit 1, Automatic Actuation of the 1B Emergency Diesel Generator Load Sequencer on Bus Under-voltage Condition 71153 Closed

PLANT STATUS

Unit 1 operated at or near 100 percent rated thermal power (RTP) for the entire inspection period.

Unit 2 began the inspection period shut down for a scheduled refueling outage. On October 24, 2022, the Unit 2 reactor was manually tripped due to a loss of main feedwater during the unit startup. The unit was placed online on October 26, 2022, and returned to near 100 percent RTP on October 28, 2022. The unit operated 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 performed activities described in IMC 2515, Appendix D, Plant Status, observed risk significant activities, and completed on-site portions of IPs. 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.

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 a prolonged period of temperature below freezing and the implementation of licensee procedure PT/0/B/4700/038, Cold Weather Protection, for the following systems:

Steam and feed water instrumentation in the dog houses on December 21 and 22, 2022

Refueling water storage tank instrumentation on December 22, 2022

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 using licensee procedure RP/0/B/5000/030, Severe Weather Preparations, for predicted icing conditions and heavy winds on December 21 and 22, 2022.

71111.04 - Equipment Alignment

Partial Walkdown Sample (IP Section 03.01) (1 Sample)

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

(1)1A emergency diesel generator on November 16, 2022

Complete Walkdown Sample (IP Section 03.02) (1 Sample)

(1) The inspectors evaluated system configurations during a complete walkdown of the nuclear service water system on November 15, 17, and 21, 2022, and December 1, 16, and 20, 2022.

71111.05 - Fire Protection

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

(1) The inspectors evaluated the onsite fire brigade training and performance during an announced fire drill on November 17, 2022.

71111.11A - Licensed Operator Requalification Program and Licensed Operator Performance

Requalification Examination Results (IP Section 03.03) (1 Sample)

(1) The licensee completed the annual requalification operating examinations required to be administered to all licensed operators in accordance with Title 10 of the Code of Federal Regulations 55.59(a)(2), "Requalification Requirements," of the NRC's "Operator's Licenses." During the week of November 28, 2022, the inspector performed an in-office review of the overall pass/fail results of the individual operating examinations and the crew simulator operating examinations in accordance with IP 71111.11, "Licensed Operator Requalification Program." These results were compared to the thresholds established in Section 3.03, "Requalification Examination Results," of IP 71111.11.

The inspectors reviewed and evaluated the licensed operator examination failure rates for the requalification annual operating exam completed on August 11, 2022.

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 PT/0/A/4150/030, [Rod Cluster Control Assembly] Bank Repositioning, on December 16, 2022.

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

(1) The inspectors observed and evaluated a simulator scenario for operator training involving small break loss of coolant accident on November 16, 2022.

71111.12 - Maintenance Effectiveness

Quality Control (IP Section 03.02) (1 Sample)

The inspectors evaluated the effectiveness of maintenance and quality control activities to ensure the following structure, system, or component remains capable of performing its intended function:

(1)125V essential battery banks - NCR 02439553, Nuclear oversight audit - battery test currents do not meet calculation results

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) Elevated risk due to 1B nuclear service water (RN) pump - cross train work on a protected component on October 5, 2022 (work order (WO) 20546679)

(2) Elevated risk due to PCB-14 work on protected switchyard component, on October 18, 2022 (WO 20449722)

(3) Elevated risk due to scheduled maintenance on Unit 2 auxiliary feedwater (CA)pump A on November 10, 2022 (WO 20552862)

71111.15 - Operability Determinations and Functionality Assessments

Operability Determination or Functionality Assessment (IP Section 03.01) (4 Samples)

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

(1) NCR 02443375, failure of 2SV-1 (steam generator power-operated relief valve) to meet acceptance criteria of PT/2/A/4200/069 on October 19, 2022

(2) NCR 02442443, 2A decay heat removal (ND) pump missing anti-rotation pin on November 9, 2022

(3) NCR 02441135, boric acid leak on 2A ND Pump on November 11, 2022

(4) NCR 20568268, Unit 1 turbine building sump pump system health degraded and staging of alternate sump pump on December 5, 2022

71111.18 - Plant Modifications

Severe Accident Management Guidelines (SAMG) Update (IP Section 03.03) (1 Sample)

(1) The inspectors verified the site SAMG were updated in accordance with the pressurized-water reactor generic severe accident technical guidelines and validated in accordance with NEI 14-01, Emergency Response Procedures and Guidelines for Beyond Design Basis Events and Severe Accidents, Revision 1, on November 16, 2022.

71111.19 - Post-Maintenance Testing

Post-Maintenance Test Sample (IP Section 03.01) (8 Samples)

The inspectors evaluated the following post-maintenance testing activities to verify system operability and/or functionality:

(1) Partial performance of IP/2/A/3670/001 B, Calibration Procedure for D/G-2B Load Sequencer Timers (EQB), following replacement of sequencer timer AG (LT1BT) in 2DGSLB-2, WO 20531425

(2) PT/2/A/4250/003 A, Auxiliary Feedwater Motor Driven 2A Performance Test, following scheduled maintenance on November 10, 2022

(3) PT/2/A/4400/003 A, Component Cooling (KC) Train 2A Performance Test, following repair of inboard/outboard mechanical seal leak on November 17, 2022, WO 20561424

(4) IP/2/B/3225/015, Rev. 052, Calibration and Testing Procedure for Main Turbine Digital Control System Performance Test, following scheduled maintenance, completed December 12, 2022

(5) PT/0/A4200/020 B, Standby Shutdown Facility Diesel Generator Load Rejection Test, and PT/0/4200/017 A, Standby Shutdown Facility Diesel Test, completed December 14, 2022

(6) SM/0/A/8030/001, Rev. 27, Relief Valve Set Pressure Testing and Adjustment, WO 20426442, and MP/0/A/7650/148, Rev. 24, ASME Section XI Repair/Replace Activities, WO 20426445, review completed December 19, 2022

(7) IP/1/A/3030/011, Rev. 36, Calibration Procedure for Auxiliary Feedwater Pump Turbine (CA/SA) Speed Indications, WO 20507475, review completed December 20, 2022

(8) IP/0/B/3390/001, Rev. 13, EXA System - Major Component Replacement, WO 20325499, review completed December 22, 2022

71111.20 - Refueling and Other Outage Activities

Refueling/Other Outage Sample (IP Section 03.01) (1 Sample)

(1) The inspectors evaluated refueling outage C2R25 activities from October 1, 2022, to October 26, 2022.

71111.22 - Surveillance Testing

The inspectors evaluated the following surveillance testing activities to verify system operability and/or functionality:

Inservice Testing (IP Section 03.01) (2 Samples)

(1) PT/2/A/4200/010 B, Residual Heat Removal Pump 2B Performance Test, on November 16, 2022

(2) PT/1/A/4200/04C, Containment Spray Pump 1B Performance Test, WO 20558138

Ice Condenser Testing (IP Section 03.01) (1 Sample)

(1) PT/0/A/4200/086, Rev. 6, Ice Bed Analysis Periodic Test, WO 20506615

71114.06 - Drill Evaluation

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

The inspectors evaluated:

(1)a drill involving a fire within the protected area and an anticipated transient without scram on November 2,

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 (October 1, 2021 - September 30, 2022)

(2) Unit 2 (October 1, 2021 - September 30, 2022)

MS05: Safety System Functional Failures (SSFFs) Sample (IP Section 02.04) (2 Samples)

(1) Unit 1 (October 1, 2021 - September 30, 2022)

(2) Unit 2 (October 1, 2021 - September 30, 2022)

BI02: RCS Leak Rate Sample (IP Section 02.11) (2 Samples)

(1) Unit 1 (October 1, 2021 - September 30, 2022)

(2) Unit 2 (October 1, 2021 - September 30, 2022)

71152A - Annual Follow-up Problem Identification and Resolution Annual Follow-up of Selected Issues (Section 03.03)

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

(1) Loss of all power to the 4160V essential bus 1ETB on October 27, 2021 (action request 02403367)

(2)1A diesel generator "Slow Start enabled" switch found on December 1, 2022 (NCR 02420721)

71152S - Semiannual Trend Problem Identification and Resolution Semiannual Trend Review (Section 03.02)

(1) The inspectors reviewed the licensees corrective action program for potential adverse trends in procedure use and adherence that might be indicative of a more significant safety issue.

71153 - Follow Up of Events and Notices of Enforcement Discretion Event Report (IP Section 03.02)

The inspectors evaluated the following licensee event report (LER):

(1) LER 05000413/2021-005-00, Automatic Actuation of the 1B Emergency Diesel Generator Load Sequencer on Bus Under-voltage Condition (ADAMS Accession No. ML21355A165). The inspectors determined that it was not reasonable to foresee or correct the cause discussed in the LER therefore no performance deficiency was identified. The inspectors did not identify a violation of NRC requirements.

INSPECTION RESULTS

Observation: Procedure Use and Adherence Implementation 71152S The inspectors reviewed the licensees corrective action program for potential adverse trends in procedure use and adherence that might be indicative of a more significant safety issue. Of concern is the longstanding site-identified performance trend in procedure use and adherence standards implementation. Instances of loss of situational awareness associated with procedure integration or process implementation indicate that corrective actions for procedural use and adherence standards implementation may not be effective. Recent examples of loss of situational awareness for procedure integration and process implementation include loss of vacuum due to the procedure sequence integration between the two units (NCR 02447130), missed inservice inspection/authorized nuclear inservice inspector reviews of repairs (NCR 02452989), and a missed receipt survey required for specific package classification (NCR 02451328).

EXIT MEETINGS AND DEBRIEFS

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

On January 18, 2023, the inspectors presented the integrated inspection results to Nicole Flippin and other members of the licensee staff.

DOCUMENTS REVIEWED

Inspection

Procedure

Type

Designation

Description or Title

Revision or

Date

71111.05

Procedures

AD-OP-ALL-0207

Fire Brigade Administrative Controls

Miscellaneous

Licensed Operator Requalification Scenario

11/16/2022

71111.11Q

Procedures

AD-OP-ALL-1000

Conduct of Operations

71111.12

Corrective Action

Documents

NCR 02434553

NOS Audit Battery test currents do not meet calculation results

71111.15

Corrective Action

Documents

NCR 02441135

2ND-PU-A has an active and excessive boric acid leak from

the pump seal

71111.20

Procedures

AD-SY-ALL-0460

Managing Fatigue and Work Hour Limits

Corrective Action

Documents

NCR 02420721

1A DG "Slow start enabled" switch found on

AD-PI-ALL-0100

Corrective Action Program

IP/1/1/3670/001B

Calibration Procedure for DG-1B Load Sequencer Timers

(EQB)

IP/1/A/3670/001A

Calibration Procedure for DG-1A Load Sequencer Timers

(EQB)

71152A

Procedures

PT/1/A/4200/009A

Auxiliary Safeguards Test Cabinet Periodic Test

269

71153

Miscellaneous

AD-EG-ALL-1311,

Att. 2

1ETB Loss of Power During Sequencer Calibration Fault

Table

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