IR 05000413/2025010

Comprehensive Engineering Team Inspection Report 05000413/2025010 and 05000414/2025010

ML25176A079
Person / Time
Site:	Catawba
Issue date:	06/27/2025
From:	Marcus Riley NRC/RGN-II/DORS/EB1
To:	Flippin N Duke Energy Carolinas
References
IR 2025010
Download: ML25176A079 (1)

Text

SUBJECT:

CATAWBA NUCLEAR STATION - COMPREHENSIVE ENGINEERING TEAM INSPECTION REPORT 05000413/2025010 AND 05000414/2025010

Dear Nicole Flippin:

On May 22, 2025, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Catawba Nuclear Station and 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, Marcus A. Riley, Chief Engineering Branch 1 Division of Operating Reactor Safety 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:

05000413/2025010 and 05000414/2025010

Enterprise Identifier:

I-2025-010-0030

Licensee:

Duke Energy Carolinas, LLC

Facility:

Catawba Nuclear Station

Location:

York, SC

Inspection Dates:

May 05, 2025 to May 22, 2025

Inspectors:

P. Braxton, Reactor Inspector

D. Burgess, Reactor Inspector

J. Copeland, Reactor Inspector

C. Franklin, Reactor Inspector

M. Hagen, Reactor Inspector

A. Ruh, Senior Reactor Inspector

D. Strickland, Senior Reactor Inspector

Approved By:

Marcus A. Riley, Chief

Engineering Branch 1

Division of Operating Reactor Safety

SUMMARY

The U.S. Nuclear Regulatory Commission (NRC) continued monitoring the licensees performance by conducting a Comprehensive Engineering Team 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

None.

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.

REACTOR SAFETY

===71111.21M - Comprehensive Engineering Team Inspection The inspectors evaluated the following components and listed applicable attributes, permanent modifications, and operating experience:

Structures, Systems, and Components (SSCs) (IP section 03.01)===

For each component sample, the inspectors reviewed the licensing and design bases including:

(1) the Updated Final Safety Analysis Report (UFSAR);

(2) the Technical Specifications (TS); and

(3) the Technical Requirements Manual (TRM). The inspectors reviewed a sample of operating procedures (including normal, abnormal, and emergency procedures) and overall system/component health (including condition reports and operability evaluations, if any). The inspectors performed visual inspections of the accessible components to identify potential hazards and/or signs of degradation. Additional component specific design attributes reviewed by the inspectors are listed below.

(1) Unit 1 Emergency Diesel Control (EQC)

3. Surveillances, acceptance criteria, and recent results:

a.

Control relays b.

DC voltage regulator c.

Timing relays

4. Electrical design calculations and considerations:

a.

DG protective relay b.

Loss of offsite power (LOOP) - Loss of coolant accident (LOCA)loading analysis c.

Agastat E7000 qualified life d.

Cutler-Hammer qualified life analysis

(2) Unit 1: Motor Operated Valve - RHR Supply to Safety Injection Pump 1B (1NI-136B)

2. Protection against external events:

a.

Flooding, including sump pump b.

Seismic c.

High energy line break

3. Mechanical design

a.

Weak link analysis b.

Required thrust (torque)c.

Closure/Opening time d.

Maximum differential pressure

4. Test/inspection procedures, acceptance criteria, and recent results:

a.

Inservice testing b.

Thermal overload testing c.

TS required surveillance

5. Motor power requirements:

a.

Voltage drop b.

Control logic c.

Control voltage drop d.

Load flow e.

Thermal overload f.

Required minimum voltage g.

Degraded voltage effects h.

Brake horsepower i.

Motor thermal overload protection j.

Cable ampacity k.

Protective devices

6. Emergency power (Emergency Diesel Generator and/or, battery)

(3) Unit 1: Emergency Diesel Generator Loop Sequencer (EQB)

1. Surveillances, and recent results

a.

Sequence load b.

Timer calibration c.

ESF actuation periodic d.

Diesel generator load sequencer test e.

Loss of voltage 2/3 logic circuit test

2. Calibration procedure load sequencer timers

(4) Unit 2: Component Cooling Heat Exchangers

6. Interaction with interfacing systems

(5) Unit 2: Safety-Related Battery (EBA-A)

2. Conformance with manufacturer instructions for installation, maintenance and

operation

5. Adequacy of corrective action activities

(6) Unit 1: Emergency Diesel Generator Charger (DGCB)

5. Vendor recommendation

(7) Unit 1: Safety Injection Check Valve (1NI-181)

2. Surveillance test results

(8) Unit 2: Turbine Driven Auxiliary Feedwater Pump

6. Operator actions for fire events

(9) Unit 2: High Pressure Injection Sump Recirculation

Modifications (IP section 03.02) (3 Samples)

(1) EC 423281, Removal of Components from Environmental Qualification Program

(2) EC 418257, Install Auxiliary Lube Oil Pump on the 1A and 1B Emergency Diesel Generators

(3) EC 423143, Diesel Fuel Rack Lubrication Quality Level Evaluation 10 CFR 50.59 Evaluations/Screening (IP section 03.03) (8 Samples)

(1) Evaluation 02484183, Dose updates to CNS Table 15-14

(2) Screening 02430569, EPQ Diesel Battery Rooms Alternate Cooling Procedure Changes

(3) Screening 02453146, Revise Updated Final Safety Analysis Report Table 7-15, ESFAS Response Times for ND-26, 27, 60 and 61

(4) Evaluation 02398063, Extend Turbine Valve Test Intervals

(5) Screening 02509847, UFSAR Revision Section 9.4.4.2

(6) Screening 02364964, SLC 16.10-5, Revision 1, Turbine Driven Auxiliary Feedwater Pump Pit (WL)

(7) Evaluation 02427994, Revision 7 to SLC 16.7-5

(8) Screening 02487117, CNS Single Rod Withdrawal Dose Consequences Update

Operating Experience Samples (IP section 03.04) (3 Samples)

(1) IN-01-14, Problems with Incorrectly-Installed Swing-Check Valves

(2) IN 97-21, Availability of AC Power Source Designed for Station Blackout Event

(3) IN 2010-020, Turbine Driven Auxiliary Feedwater Pump Repetitive Failures

INSPECTION RESULTS

No findings were identified.

EXIT MEETINGS AND DEBRIEFS

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

• On May 22, 2025, the inspectors presented the Comprehensive Engineering Team Inspection results to Nicole Flippin and other members of the licensee staff.

DOCUMENTS REVIEWED

Inspection

Procedure

Type

Designation

Description or Title

Revision or

Date

AD-EG-ALL-1450

Preconditioning of Structures, Systems and Components

CNC -1200.00-00-

0001

UNIT 1 Main Turbine Missle Probability Calculation

2, 13

CNC -1200.00-00-

0002

UNIT 2 Main Turbine Missle Probability Calculation

10, 12

CNC -1200.00-00-

0006

Catawba Turbine Overspeed Protection System

Maintenance and Test Interval Extension Assessment

CNC -1381.05-00-

0050

U1/2, 125VDC Essential Diesel Auxiliary Power System

(EPQ) Battery and Charger Sizing

CNC -1381.05-00-

0147

U1/2 4.16KV Essential Auxiliary PowerSystem (EPC)

Diesel-Generator (D/G) LOCA/LOOP and LOOp (Blackout)

Loading Analysis

CNC -1381.05-00-

25

U1/2, 125VDC Vital I&C Power System(EPL) ETAP

Model Base File

CNC -1381.05-

265

Catawba Unit 1 AND 2 125VDC Vital I&C Power System

Battery & Charger Sizing, Voltage Drop and Short Circuit

Analysis

CNC-1205.19-00-

21

Generic Letter 89-10 MOV Calculations, NI System, NI 136

CNC-1210.04-00-

0031

Flow Element Calculations for KC Heat Exchanger A and B

Inlet Flow

CNC-1211.00-00-

0013

Diesel Generator Building HVAC Calculations

CNC-1223.11-00-

0055

Limiting Stroke Time for ND26, ND27, ND60 and ND61

CNC-1223.12-00-

0036

Operating Parameters for Valve 1(2) NI-136B

CNC-1223.23-00-

0033

Supporting Calc for Response to NRC IE Bulletin 88-04,

"Potential Safety Related Pump Loss" (Component Cooling

Pumps)

71111.21M

Calculations

CNC-1223.24-00-

0018

Acceptable RN Flow and Fouling in the KC Heat

Exchangers

Inspection

Procedure

Type

Designation

Description or Title

Revision or

Date

CNC-1223.24-00-

0050

RN Cooled Heat Exchangers Tubeside Differential Pressure

Limitations

CNC-1223.42-00-

0043

Unit 2 CA System Response to Chapter 15 Accidents

CNC-1381.05-00-

0015

Battery Charger Relay Settings and Battery Ground and

Undervoltage Relay Settings for Systems EBH, EPJ, EPK,

EPL, and EPQ

CNC-1381.05-00-

0017

Class 1 E Diesel Protective Relaying and Sequencer

Undervoltage Relay Settings

CNC-1381.05-00-

0017_Rev19_(DG

Protective Relay &

UV Settings) - 4-

25

Cutler-Hammer QualifiedlService Life Analvsis

03/24/1997

CNC-1381.05-00-

0198

U1, 6.9KV, 4.16KV & 600V Auxiliary Power Systems Safety-

Related Voltage Analysis

CNC-1381.05-00-

243

Unit 1/2-Intercell Resistance Calculation for 125 VDC Vital

l&C Battery System (EPL) and 125 VDC

Essential Diesel Auxiliary Power Battery System (EPQ)

CNC-1381.17-00-

0063

Evaluation of KC Annubars for PIP 0-C92-0144 Loops

1KCFE5530/5540 & 2KCFE5530/5540

CNC-1552.08-00-

0390

Long Term Containment Response - Manual NS Initiation

CNM-1205.00-

2106.0

Motor Operator Sizing Information for Borg Warner Valves

CNS-1592.CA-00-

0001

Auxiliary Feedwater System (CA) Design Basis

Specification

DPC -1381.05-00-

0009

Qualified Life Of Agastat E7000 Series Timing Relays

DPC-1381.05-00-

0105

Evaluation of Radiation Thresholds in Radiation Only Harsh

Environment at MNS and CNS and a Justification for a

Graded Approach.

SDQA-00056-

CNS

KC Heat Capacity

Inspection

Procedure

Type

Designation

Description or Title

Revision or

Date

SDQA-00081-

CNS

Heat Exchanger Fouling Factor

SDQA-00109-

CNS

KC/ND Heat Exchanger Interaction.xls

Corrective Action

Documents

2485604,

2442442,

2442816,

2442864,

1460604,

2302424,

21799,

26296,

2030307,

2032271,

2032852,

2033189,

Corrective Action

Documents

Resulting from

Inspection

AR 02553399

AR 02553500

AR 02553831

AR 02554711

AR 02554995

AR 02555579

NCR 02553598

05/22/2025

CN-1562-01.02

P&ID: Safey Injection System (NI)

CN-1705-04.01

One Line Diagram, 125 VDC Diesel Essential Auxiliary

Power System (EPQ)

CN-1734-01.05

Connection Diagram, Safety Injection System (NI) B-Train

Motor Operated Valves: 1 IN150B, 1NI135B, 1NI136B,

1BOX0017

CN-1759-11.01

Connection Diagram Diesel Power Auxiliary Battery Charger

1DGCA & 1DGCB EPQ System

CN-2573-01.00

Flow Diagram of Component Cooling System (KC)

Drawings

CN-2680-146

KC2B Component Cooling Heat Exchanger Tube Plugging

Map RN Inlet Side

Inspection

Procedure

Type

Designation

Description or Title

Revision or

Date

CNEE-0114-00.04

E/D DIESEL GENERATOR NO. 1A LOAD SEQ. PART 4

LOAD LOGIC, VOLTAGE SENSING, RESET & LOAD

SHED

CIRCUIT

CNEE-0141-01.07

Residual Heat Removal Sys ND NC Loop 3 Supply to ND

Train 1B Isolation Valve 1ND36B

CNEE-0151-01.07

Elementary Diagram: Residual Heat Removal (ND) Supply

to Safety Injection Sys (NI) Pump 1B Valve 1NI136B

CNM 1201.06-

0060.001

Component Cooling HX Data Sheet

CNM 1201.06-

0139.001

Tube Bundle Details of KC Component Cooling HX 1A/B

CNM-1205.00-

207.001

8IN. SS M/O GATE VLV ITEM 4G-203 4G-204

00Q

CNM-1205.00-

2195-001

Westinghouse Swing Check Valve

D2

CNS-1573.KC-00-

0001

Component Cooling System (KC) Design Basis

Specification

CNSF-1609-LD.01

Summary Flow Diagram Diesel Generator Engine Lube Oil

System (LC) Unit 1

21-CNS-027

UFSAR Change Package

03/31/2022

22-CNS-005

UFSAR Change Package

23143

Diesel Fuel Rack Lubrication Quality Level Evaluation

000

EC 0000419873

005

Replace EDG Non-Emergency Trip Panels 1A and 1B

05/02/2024

EC 0000423281

000

Removal of Components from EQ Program

EC 02509847

UFSAR Revision Section 9.4.4.2

04/09/2024

EC 416000

KC 2A Heat Exchanger Retubing: Admiralty Brass to

Stainless Steel

EC 418355

Allow Use of New Connecting Rod Bearings for 1A, 1B, 2A,

and 2B EDGS

Engineering

Changes

EC 418609

Compilation of Margins that Effect EDG Connecting Rod

Bearing Capacity to Rotate

Inspection

Procedure

Type

Designation

Description or Title

Revision or

Date

A/R 02427994

CFR 50.59 Evaluation, Revision 7 to SLC 16.7-5

05/26/2022

A/R 02427994

CFR 50.59 Evaluation: Revision 7 to SLC 16.7-5

A/R 02484183

Dose Updates to CNS UFSAR Table 15-14

09/14/2023

A/R 02487117

CFR 50.59 Screen: CNS Single Rod Withdrawal Dose

Consequences Update

CNC 1301.00-

0470.001

CNS EDG Connecting Rod Bearing AA852 T101 Design

Validation

CNC-1223.59-02-

0009

Impact of Air in CNS 1A EDG Lube Oil System on Rotation

of Connecting Rod Bearing Shell

Engineering

Evaluations

CNC-1223.59-02-

0009

Analysis of Rotated Connecting Rod Bearing in Catawba

Nuclear Station Emergency Diesel Generators

C-01-05747

IN 2001-14 Problem Identification

11/13/2001

CNLT-1780-03.03

Environmental Qualification Criteria Manual (EQCM)

CNM 1301.00-

237.002

DIESEL GENERATOR INSTRUCTION MANUAL VOL II

108

CNM 1356.08-

0003.001

75AMP EDG Battery Charger Instruction Manual

CNM 2356.01-

0002.001

INSTALL. & MAINT. MANUAL FOR VITAL BATTERY &

RACKS - UNIT 2

CNM-1201.05-

269.001

1B Auxiliary Feedwater Pump Turbine

CNM-1205.00-

1611.001

Acceptance Test Procedure 8" CRES 600 LB Gate Valve,

Motor Operated, Class 2

A

CNM-1205.19-

0083.001

Technical Repair Guide for Rotork Valve Actuators "NA"

Range Models

CNS 1301.00-00-

0002

Diesel Generator Specification Amendment

CNS-106.01-EPL-

0001

Design Basis Specification for the 125 VDC Vital I & C

Power System (EPL)

CNS-106.03-EPQ-

0001

Design Basis Specification For The EPQ System

CNS-120.01-

EQC-0001

DESIGN BASIS SPECIFICATION FOR THE EQC SYSTEM

09/21/1994

Miscellaneous

CNS-1561.ND-00-

Design Basis Specification for the Residual Heat Removal

Inspection

Procedure

Type

Designation

Description or Title

Revision or

Date

0001

(ND) System

CNS-1562.NI-00-

0001

Design Basis Specification for the Safety Injection (NI)

System

CNS-1562.NI-00-

0001

Design Basis Specification for the Safety Injection (NI)

System

CNS-

1579.VD.00.0001

Design Basis Specification for the Diesel Building

Ventilation System

EQC Health

Report (Q2-2024)

EDG System Health Report Q2 2024

04/08/2025

Metallurgy File

1. 3709

CNS 1A D/G Connecting Rod Bearing Failure

01/08/2007

OEDB Number:

97-13666

OEDB Screening of NRC Information Notice 97-21

05/15/1997

WO 20551791

1EQC AN DECPAF04 INVESTIGATE BARRING DEVICE

ENGINE START LOCKOUT

PT-1-A-4350-002

- 11-5-24

Diesel Generator 1A Operability Test

11/05/2024

Operability

Evaluations

PT-1-A-4350-

015A - 8-10-22

Diesel Generator 1A Periodic Test

08/10/2022

AD-DC-ALL-0202

Writer's Manual for Procedures and Work Instructions

AD-EG-ALL-1612

Environmental Qualification (EQ) Program

AD-EG-DEC-1477

CLASS QA1 AND QA5 AC AND DC MOLDED CASE

CIRCUIT BREAKER COMPONENT PROGRAM

09/08/2016

AD-MN-ALL-0017

Housekeeping, Material Condition, and Seismic

Requirements for Equipment Storage

AD-OP-ALL-0204

Plant Status Control Measures

AD-OP-ALL-0204

Plant Status Control

Rev. 8

CNM 1314.01-

0316.001

Catawba Aging Management Program - Molded Case

Circuit Breakers

05/11/2003

EP/1/A/5000/ECA-

1.1

Loss of Emergency Coolant Recirculation

EP/1/A/5000/ES-

1.2

Post LOCA Cooldown and Depressurization

Procedures

EP/1/A/5000/ES-

Transfer to Cold Leg Recirculation

Inspection

Procedure

Type

Designation

Description or Title

Revision or

Date

1.3

EP/1/A/5000/ES-

1.4

Transfer to Hot Leg Recirculation

IP/0/A/3820/002 B

Rotork Actuator Preventive Maintenance

IP/0/A/3820/004 Q

MOV Diagnostic Testing

IP/1/A/3720/005

Calibration of Diesel Generator Battery Charger High/Low

Relay Alarms (EPQ)

MP/0/A/7200/005

Auxiliary Feedwater Pump Turbine Corrective Maintenance

Procedure and Overspeed Trip Test

MP/0/A/7600/010

Westinghouse Swing Check Valve Corrective Maintenance

PT/1/A/4200/001

N

Reactor Coolant System Pressure Boundary Valve Leak

Rate Test

05/24/23

PT/1/A/4200/001

N

Reactor Coolant System Pressure Boundary Valve Leak

Rate Test

10/27/24

PT/1/A/4350/002

E

CA, CF and Turbine Interlocks Periodic test

10/26/2024

PT/1/A/4550/004

D/G Fuel Oil Storage Tank Water Inspection

Rev. 025

PT/2/A/4200/061

RN to KC Piping Flush

PT/2/A/4400/003

A

Component Cooling (KC) Train 2A Performance Test

PT/2/A/4400/006

KC Heat Exchanger 2B Heat Capacity Test

PT/2/A/4400/009

Cooling Water Flow Monitoring for Asiatic Clams and

Mussels Test

PT/I/A/4200/009 L

ECCS Valve Interlock Test

PT/l/A/4200/013 G

NI Valve Inservice Test (UNK)

SI/0/A/5200/006

MOV Actuator Lubrication and Inspection

01414217

Anderson Greenwood Check Valve Review

07/09/2001

20553390 02

Sequencer 1A Timer Calibration

06/02/2023

20605384

2SA TR 0001 - Overspeed Trip Test

05/28/2023

20618572

CA System Flow Verification Test

09/11/2024

20649098 01

Sequencer 1A Timer Calibration

10/28/2024

Work Orders

20650177,

1702387,

Inspection

Procedure

Type

Designation

Description or Title

Revision or

Date

20458066,

2473949,

2353625-03,

2381134,

2420912,

2421629,

2426037,

2440767,

2468191,

20536413,

20685674,

20690068,

20695065,

20698907,

20704157,

20710807,

20637134,

20710807,

20637308.

20698904,

20684680,

20434259,

20558896,

20676230,

20458066,

20456696,

20179125,

20504960,

20605910,

20504658,

291151,

20690739,

20675312,

20027810,

Inspection

Procedure

Type

Designation

Description or Title

Revision or

Date

20504659

20671339

Turbine Driven Auxiliary Feedwater Pump #2 Performance

Test

08/23/2024

20696964

CA Valve Verification

2/21/2024

20706298

2CA: PM Aux Feedwater PMP (CAPT #2)

2/24/2025

WO 2056492201

Replace 1EMXF Breakers

10/20/2022

WR 1090948

Replace 1EMXF Bkrs

07/22/2013