IR 05000390/2023001

Integrated Inspection Report 05000390/2023001 and 05000391/2023001

ML23123A054
Person / Time
Site:	Watts Bar
Issue date:	05/04/2023
From:	Louis Mckown Division Reactor Projects II
To:	Jim Barstow Tennessee Valley Authority
References
IR 2023001
Download: ML23123A054 (10)

Text

May 4, 2023

SUBJECT:

WATTS BAR NUCLEAR PLANT - INTEGRATED INSPECTION REPORT 05000390/2023001 AND 05000391/2023001

Dear Mr. Barstow:

On March 31, 2023, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Watts Bar Nuclear Plant. On April 19, 2023, the NRC inspectors discussed the results of this inspection with Mr. Anthony Williams 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, Signed by McKown, Louis on 05/04/23 Louis J. McKown, II, Chief Reactor Projects Branch 5 Division of Reactor Projects Docket Nos. 05000390 and 05000391 License Nos. NPF-90 and NPF-96

Enclosure:

As stated

Inspection Report

Docket Numbers: 05000390 and 05000391 License Numbers: NPF-90 and NPF-96 Report Numbers: 05000390/2023001 and 05000391/2023001 Enterprise Identifier: I-2023-001-0020 Licensee: Tennessee Valley Authority Facility: Watts Bar Nuclear Plant Location: Spring City, TN 37381 Inspection Dates: January 01, 2023 to March 31, 2023 Inspectors: W. Deschaine, Senior Resident Inspector D. Strickland, Senior Project Engineer R. Wehrmann, Resident Inspector Approved By: Lou J. McKown, II, Chief Reactor Projects Branch 5 Division of Reactor Projects Enclosure

SUMMARY

The U.S. Nuclear Regulatory Commission (NRC) continued monitoring the licensees performance by conducting an integrated inspection at Watts Bar Nuclear 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 rated thermal power (RTP) for the entire inspection period.

Unit 2 operated at or near RTP for the entire 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

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 and high winds on March 2, 2023.

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) Units 1 & 2 Essential Raw Cooling Water System (both trains) on January 27, 2023.

(2) Unit 1 Emergency Diesel Generator (EDG) system 1B on March 16, 2023.

(3) Unit 1 Safety Injection (SI) system B train on March 23, 2023.

(4) Unit 1 Motor Driven Auxiliary Feedwater (MDAFW) system both trains on March 31, 2023.

71111.05 - Fire Protection

Fire Area Walkdown and Inspection Sample (IP Section 03.01) (5 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) Auxiliary Building, elevation 757' - Auxiliary Control Room, Auxiliary Instrument Rooms, and 125V Vital Battery Board Rooms on February 21, 2023.

(2) Auxiliary Building, elevation 713' Penetration Rooms on March 7, 2023.

(3) Auxiliary Building, elevation 772' (480V Board Rooms) on March 14, 2023.

(4) Auxiliary Building, elevation 729' on March 15, 2023.

(5) Auxiliary Building, elevation 737' on March 15, 2023.

71111.07A - Heat Exchanger/Sink Performance

Annual Review (IP Section 03.01) (2 Samples)

The inspectors evaluated readiness and performance of:

(1) 1-HTX-82-720B1-B, EDG jacket water heat exchanger 1B1 on March 20, 2023.

(2) 2-HTX-82-720B2-B, EDG jacket water heat exchanger 2B2 on March 24, 2023.

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 the following activities:

EDG 1A monthly start and load test on January 6, 2023 (WO 122941705)

EDG 1A 24-hour load run on March 2, 2023 (WO 122942306)

Component cooling system pump test on March 15, 2023 (WO 123028665)

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

(1) The inspectors observed and evaluated the following licensed operator requalification simulator scenarios (LOR training cycle 2301), which included a pressurizer level transmitter failing low, a feed water pressure transmitter failing low, a main steam line break in containment, and an Anticipated Transient Without Scram (ATWS) with a diesel generator failing to start.

Crew 3 on January 19, 2023 Crew 2 on January 26, 2023

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) Risk assessment for week of February 6, 2023, with the A train main control room (MCR) chiller out of service (OOS) for emergent work and the vital inverter 0-II OOS for planned maintenance.

(2) Risk assessment for week of February 13, 2023, with the A train spent fuel pool heat exchanger OOS for planned maintenance.

(3) Risk assessment for week of February 20, 2023, with the B train MCR chiller OOS for planned maintenance.

(4) Risk assessment for week of March 6, 2023, with the 1B EDG OOS for planned maintenance.

(5) Risk assessment for week of March 20, 2023, with the 2B EDG OOS for planned maintenance.

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) CR 1833739, MCR Chiller A (0-CHR-031-0080A) will not maintain chill water temperature past operability evaluation (POE) on February 16, 2023.

(2) CR 1833741, MCR Chiller B (0-CHR-031-0096B) tripped on low oil pressure on February 16, 2023.

(3) CR 1843048, 1B battery charger #2 alarm defeat switch found in defeat with charger in service on March 31, 2023.

71111.24 - Testing and Maintenance of Equipment Important to Risk

The inspectors evaluated the following testing and maintenance activities to verify system

operability and/or functionality: Post-Maintenance Testing (PMT) (IP Section 03.01)

(1) Unit 1 B train EDG drag start test and overspeed test follow the 2 year engine inspection, 0-MI-82.003 on March 9, 2023 (WO 122903442)

(2) Unit 2 B train EDG drag start test and overspeed test follow the 2 year engine inspection, 0-MI-82.003 on March 23, 2023 (WO 122903432)

Surveillance Testing (IP Section 03.01) (3 Samples)

(1) Unit 1 EDG 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> load run (1A-A), 0-SI-82-13 on March 2, 2023 (WO 122942306)

(2) Unit 2 SI pump 2B-B quarterly performance test, 2-SI-63-901-B on March 7, 2023 (123028155)

(3) MDAFW pump 2A-A quarterly performance test, 2-SI-3-901-A on March 14, 2023 (WO 23028193)

Inservice Testing (IST) (IP Section 03.01) (1 Sample)

(1) Unit 2 MDAFW pump 2B-B quarterly performance test, 2-SI-3-901-B on February 6, 2022 (WO 123028199)

Diverse and Flexible Coping Strategies (FLEX) Testing (IP Section 03.02) (1 Sample)

(1) FLEX Intermediate Pressure (IP) pump performance test for 0-PMP-360-511, 0-TI- 360.301 on March 15, 2023 (WO 123028369)

INSPECTION RESULTS

No findings were identified.

EXIT MEETINGS AND DEBRIEFS

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

On April 19, 2023, the inspectors presented the integrated inspection results to Mr.

Anthony Williams and other members of the licensee staff.

DOCUMENTS REVIEWED

Inspection Type Designation Description or Title Revision or

Procedure Date

71111.04 Drawings 0-47W803-2 Flow Diagram Auxiliary Feedwater Revision 11

0-47W840-1A Flow Diagram Fuel Oil Atomizing Air & Steam for Diesel Revision 0

Generator 1B-B

0-47W840-4 Flow Diagram Fuel Oil 225KVA Diesel for Diesel Generator 11/19/2014

1B-B

1-47W839-1A Flow Diagram Diesel Starting Air System for Diesel Revision 16

Generator 1B-B

1-47W839-1E Flow Diagram Diesel Starting Air System for Diesel Revision 4

Generator 1B-B

WBN-1-47W811- Flow Diagram for the Safety Injection System Revision 0

1-ISI

Miscellaneous SDD-N3-82-4002 System Description for Standby Diesel Generator (System Revision 29

2)

WBN-SDD-N3- System Description for the Safety Injection System (System Revision 38

63-4001 63)

Procedures 0-SOI-82.02 System Operating Instruction for the Diesel Generator (DG) Revision 20

1B-B

0-SOI-82.02 ATT Diesel Generator (DG) 1B-B Power Checklist Revision 0

1P

0-SOI-82.02 ATT Diesel Generator (DG) 1B-B Valve Checklist Revision 11

1V

1-SOI-3.02 Unit 1 Auxiliary Feedwater System 1/26/2023

1-SOI-3.02 ATT Auxiliary Feedwater System Handswitch Checklist Revision

1H 0019

1-SOI-3.02 ATT Auxiliary Feedwater System Power Checklist 1-3.02-1P Revision

1P 0026

1-SOI-3.02 ATT Auxiliary Feedwater System Valve Checklist Revision

1V 0028

1-SOI-63.01 System Operating Instruction for the Safety Injection System Revision 20

1-SOI-63.01 ATT Safety Injection System Handswitch Checklist Revision 0

1H

1-SOI-63.01 ATT Safety Injection System Power Checklist Revision 9

Inspection Type Designation Description or Title Revision or

Procedure Date

1P

1-SOI-63.01 ATT Safety Injection System Valve Checklist Revision 16

1V

71111.05 Drawings 45A883-3 Electrical Penetration Seal Details Unit 1 B2-2 Revision 0

45A883-9 Electrical Penetration Seal Details Unit 1 K1 Revision 4

47A472-5 Electrical Penetration Seal Details Unit 1 V Revision 4

Fire Plans WBN Prefire AUX-0-713-01 Rev. 2, AUX-0-713-02 Rev. 3, AUX-0-713-03

Plans Rev. 4, AUX-0-737-01 Rev. 3, AUX-0-737-02 Rev. 4, AUX-0-

737-03 Rev. 3, AUX-0-757-01 Rev. 6, AUX-0-757-02 Rev. 4,

AUX-0-757-03 Rev. 9, AUX-0-757-04 Rev. 6, AUX-0-772-01

Rev. 1, AUX-0-772-02 Rev. 5, AUX-0-772-03 Rev. 5,

71111.07A Procedures 0-TI-79.000 Program for Implementing NRC Generic Letter 89-13 Revision 9

NPG-SPP-03.3 NRC Commitment Management Revision 8

NPG-SPP-09.14 Generic Letter (GL) 89-13 Implementation Revision 5

NPG-SPP-09.7.3 Raw Water Corrosion Program Revision 5

Work Orders 121612788 Visual Inspection and Evaluation of 2-HTX-82-720B2-B, 03/20/2023

Emergency Diesel Generator Jacket Water Heat Exchanger

2B2

2903568 Visual Inspection and Evaluation of 1-HTX-82-720B1-B, 03/06/2023

Emergency Diesel Generator Jacket Water Heat Exchanger

1B1

71111.13 Engineering WBN-0-23-013 PRA Evaluation Response for Unexpected results in EOOS 2/21/2023

Evaluations Software (Phoenix Risk Monitor) (Yellow) for ERCW Pumps

71111.24 Procedures 0-SI-82-13 24 Hour Load Run - DG 1A-A Revision 27

0-TI-360.301 FLEX Intermediate Pressure (IP) Pump Performance Test for Revision 2

0-PMP-360-511

2-SI-3-901-A Motor Driven Auxiliary Feedwater Pump 2A-A quarterly Revision 21

performance test

8