Text

Integrated Inspection Report 05000261/2024002
	ML24207A090
Person / Time
Site:	Robinson
Issue date:	08/01/2024
From:	Renee Taylor; Division Reactor Projects II
To:	Basta L; Duke Energy Progress
References
	IR 2024002
	Download: ML24207A090 (1)
	v • d • e

SUBJECT:

H.B. ROBINSON STEAM ELECTRIC PLANT - INTEGRATED INSPECTION REPORT 05000261/2024002

Dear Laura Basta:

On June 30, 2024, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at H.B. Robinson Steam Electric Plant. On July 23, 2024, 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, Ryan C. Taylor, Chief Reactor Projects Branch 3 Division of Reactor Projects Docket No. 05000261 License No. DPR-23

Enclosure:

As stated

Inspection Report

Docket Number:

05000261

License Number:

DPR-23

Report Number:

05000261/2024002

Enterprise Identifier:

I-2024-002-0023

Licensee:

Duke Energy Progress, LLC

Facility:

H.B. Robinson Steam Electric Plant

Location:

Hartsville, SC

Inspection Dates:

April 1, 2024 to June 30, 2024

Inspectors:

V. Gaffney, Resident Inspector

B. Kellner, Senior Health Physicist

J. Walker, Senior Emergency Preparedness Inspector

J. Zeiler, Senior Resident Inspector

Approved By:

Ryan C. Taylor, Chief

Reactor Projects Branch 3

Division of Reactor Projects

SUMMARY

The U.S. Nuclear Regulatory Commission (NRC) continued monitoring the licensees performance by conducting an integrated inspection at H.B. Robinson Steam Electric 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 2 began the inspection period operating at rated thermal power (RTP). On June 5, 2024, the unit was down powered to 47.5 percent (%) as required by Technical Specification (TS)3.7.1, Condition A, after declaring the 'C' steam generator main steam safety valve (MSSV)

SV1-1C inoperable due to the identification of an unsecured valve nozzle ring set screw. The unit was returned to RTP that same day following replacement of the valve set screw and exiting the TS action statement for an inoperable MSSV. Unit 2 operated at or near 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.

REACTOR SAFETY

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 hot temperatures and hurricane season for the following systems:

Offsite power, emergency diesel generators (EDGs), and selected auxiliary and turbine building heating, ventilation, and air conditioning systems on May 6 through 10, 2024

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 for a severe thunderstorm watch on May 8, 2024.

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)instrument air compressors 'A', 'B', and 'D' while the primary air compressor was out of service for corrective maintenance to repair feedback isolation valve (IA-3991) on April 3, 2024 (2)

'A' and 'C' component cooling water (CCW) pumps while the 'B' CCW pump was out of service for planned cable re-route of the 'B' CCW pump low pressure isolation reset switch on May 29, 2024 (3)

'B' and 'C' chemical and volume control system (CVCS) charging pumps while the 'A' CVCS charging pump was out of service for emergent replacement of a faulted motor on June 14-15, 2024

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) Fukushima FLEX equipment storage area (Building 468) on April 15, 2024 (2)service water pump area (fire zone 29) on April 18, 2024 (3)main control room (fire zone 22) and associated hagan room (fire zone 23) on May 8, 2024

(4) CCW pump room (fire zone 5) on May 29, 2024 (5)

'A' and 'B' motor driven auxiliary feedwater pump (MDAFW) room (fire zone 6) on June 7, 2024

71111.07A - Heat Exchanger/Sink Performance

Annual Review (IP Section 03.01) (1 Sample)

The inspectors evaluated readiness and performance of:

(1)

'A' residual heat removal (RHR) pump room fan cooler heat exchanger during scheduled inspection and cooling coil tube eddy current testing on June 5, 2024

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:

planned reactor down power to 99% and restoration to full power to conduct

'B' MDAFW pump testing on April 9, 2024

unscheduled reactor down power to 47.5% in accordance with TS 3.7.1 action statement requirements for inoperable MSSV SV1-1C on June 5, 2024

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

(1) The inspectors observed and evaluated a licensed operator requalification simulator evaluation on April 24, 2024.

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 remain capable of performing their intended function:

(1)turbine overspeed trip protection electro-hydraulic control solenoid pilot valve EV-4459D failure to actuate during testing on January 30, 2024 and February 5, 2024

[nuclear condition reports (NCRs) 2502862 and 2503531]

(2)source range nuclear instrument (NI)-31 spiking caused computer high flux reactor trip alarm on April 8, 2024 (NCR 2511822)

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)elevated risk (Green) during planned lubrication preventive maintenance on the 'C' CCW pump on April 15, 2024 (2)elevated risk (Green) during emergent troubleshooting to repair turbine overspeed trip protection solenoid valve EV-4459D failure on May 20, 2024 (3)elevated risk (Green) during unscheduled downpower of the reactor to 47.5% power for inoperable MSSV SV1-1C on June 5, 2024 (4)elevated risk (Green) during emergent replacement of faulted motor on 'A' CVCS charging pump on June 14-15, 2024

71111.15 - Operability Determinations and Functionality Assessments

Operability Determination or Functionality Assessment (IP Section 03.01) (5 Samples)

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

(1) NCR 2508169, 'C' CVCS charging pump primary seal leakage, review completed April 5, 2024

(2) NCR 2511822, N-31 source range nuclear instrument channel spiking, review completed on April 10, 2024

(3) NCR 2514960, containment air lock testing not performed prior to entering Mode 4 in accordance with leakage testing procedures, review completed on May 7, 2024

(4) NCRs 2516534 and 2516573, engine driven fire pump failure to meet adequate flowrate and discharge pressures during OST-646 surveillance testing on May 16, 2024

(5) NCR 2520936, small fire in the insulation surrounding the 'A' EDG exhaust piping, review completed June 28, 2024

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) (6 Samples)

(1) OST-252-2, RHR System Valve Test - Train 'B', following motor operated limitorque valve CC-749B preventive maintenance on April 17, 2024

(2) OP-301, CVCS Operations and Alignments, Section 6.10 for manual reactor coolant system letdown diversion, after replacement of CVCS reactor makeup controller HFC-114 on May 8, 2024

(3) OP-915-10, Deepwell Pumps A/B/C Normal and Alternate Power Operation, following 1-year preventive maintenance on the 'C' deepwell pump on May 15, 2024

(4) OST-551-2, Turbine Trip Functional Test, following maintenance to repair emergent failure of turbine overspeed protection trip solenoid valves EV-4459B and EV-4459D on May 20, 2024

(5) OP-301A and OST-101-1, 'A' CVCS charging pump break-in operation and surveillance testing, following pump motor replacement maintenance due to emergent motor failure on June 13, 2024

(6) OP-604-1, Diesel Generator A Operations, and OST-401-1, EDG A Slow Speed Start, following 2-year frequency preventive maintenance on the 'A' EDG on June 27-28, 2024

Surveillance Testing (IP Section 03.01) (2 Samples)

(1) OST-201-2, MDAFW System Component Test - Train B, on April 9, 2024

(2) MST-015-4, Turbine First Stage Pressure 447 Channel Operational Test Protection Channel IV (Yellow), on April 25, 2024

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

(1) OST-302-4, Comprehensive Flow Test for Service Water Pumps C & D, on April 18, 2024

Reactor Coolant System Leakage Detection Testing (IP Section 03.01) (1 Sample)

(1) OST-051, Reactor Coolant System Leakage Evaluation, on June 3, 2024

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

(1) Fukushima FLEX AFW pump #1 and #2 quarterly testing per WO 20651135 on April 15, 2024

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 June 3, 2024.

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 Preparedness Organization.

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 June 3, 2024. 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 June 3,

OTHER ACTIVITIES - BASELINE

===71151 - Performance Indicator Verification The inspectors verified licensee performance indicators submittals listed below:

IE04: Unplanned Scrams with Complications (USwC) Sample (IP Section 02.03)===

Main article: IP 71151