ML25118A320
| ML25118A320 | |
| Person / Time | |
|---|---|
| Site: | Robinson  |
| Issue date: | 04/29/2025 |
| From: | Matthew Fannon NRC/RGN-II/DORS |
| To: | Basta L Duke Energy Progress |
| References | |
| IR 2025001 | |
| Download: ML25118A320 (13) | |
Text
Laura Basta Site Vice President Duke Energy Progress, LLC 3581 West Entrance Road, RNPA01 Hartsville, SC 29550
SUBJECT:
H.B. ROBINSON STEAM ELECTRIC PLANT - INTEGRATED INSPECTION REPORT 05000261/2025001
Dear Laura Basta:
On March 31, 2025, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at H.B. Robinson Steam Electric Plant. On April 28, 2025, 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, Matthew S. Fannon, Chief Projects Branch 2 Division of Operating Reactor Safety Docket No. 05000261 License No. DPR-23
Enclosure:
As stated cc w/ encl: Distribution via LISTSERV April 29, 2025 Signed by Fannon, Matthew on 04/29/25
SUNSI Review X
Non-Sensitive
Sensitive X
Publicly Available
Non-Publicly Available OFFICE RII/DORS RII/DORS RII/DORS NAME A. Wilson J. Zeiler M. Fannon DATE 4/29/25 4/29/25 4/29/25
Enclosure U.S. NUCLEAR REGULATORY COMMISSION Inspection Report Docket Number:
05000261 License Number:
DPR-23 Report Number:
05000261/2025001 Enterprise Identifier:
I-2025-001-0029 Licensee:
Duke Energy Progress, LLC Facility:
H.B. Robinson Steam Electric Plant Location:
Hartsville, SC Inspection Dates:
January 01, 2025 to March 31, 2025 Inspectors:
C. Dorman, Resident Inspector K. Kirchbaum, Senior Operations Engineer M. Meeks, Senior Operations Engineer J. Zeiler, Senior Resident Inspector Approved By:
Matthew S. Fannon, Chief Projects Branch 2 Division of Operating Reactor Safety
2
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.
3 PLANT STATUS Unit 2 began the inspection period operating at rated thermal power (RTP). On February 13, 2025, the unit was down powered to 37 percent (%) to replace the 'C' reactor coolant system (RCS) loop flow transmitter, FT-434, that began experiencing erratic operation on February 10, 2025. Following the transmitter replacement, the unit returned to RTP later that same day. The unit remained 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 Impending Severe Weather Sample (IP Section 03.02) (2 Samples)
(1)
The inspectors evaluated the adequacy of the overall preparations to protect risk-significant systems from impending severe weather during multiple days of freezing weather conditions from January 20-22, 2025.
(2)
The inspectors evaluated the adequacy of the overall preparations to protect risk-significant systems from impending severe weather for a tornado watch on March 4, 2025.
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)
'A' and 'C' safety injection (SI) pumps while 'B' SI pump was out-of-service (OOS) for scheduled thrust bearing housing oil leak repairs on January 8, 2025 (2)
'B', 'C', and 'D' service water pumps while 'A' service water pump was OOS for scheduled pump and motor replacement activities on February 17-19, 2025 (3)
'A' and 'C' chemical and volume control system (CVCS) charging pumps while the 'B' CVCS charging pump was OOS for preventive maintenance on February 26, 2025
4 Complete Walkdown Sample (IP Section 03.02) (1 Sample)
(1)
The inspectors evaluated system configurations during a complete walkdown of the
'A' and 'B' emergency diesel generator (EDG) system on February 3, 2025.
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) rod control room (fire zone 21) on January 8, 2025 (2) main and startup transformers (fire zone 26) on February 3, 2025 (3) service water pump intake area (fire zone 29) on February 17, 2025 (4) auxiliary building second level hallway (fire zone 15) on February 20-21, 2025 (5) switchgear building 469 (fire zone 50) on March 13, 2025 Fire Brigade Drill Performance Sample (IP Section 03.02) (1 Sample)
(1)
The inspectors evaluated the onsite fire brigade training and performance during an unannounced fire drill on February 21, 2025.
71111.11B - Licensed Operator Requalification Program and Licensed Operator Performance Licensed Operator Requalification Program (IP Section 03.04)
An inspection was performed to assess the effectiveness of the facility licensee in implementing requalification requirements identified in 10 CFR Part 55, Operators Licenses. Each of the following inspection activities was conducted in accordance with IP 71111.11, Licensed Operator Requalification Program and Licensed Operator Performance.
Biennial Requalification Written Examinations The inspectors evaluated the quality of the licensed operator biennial requalification written examination administered on February 28, 2025.
Annual Requalification Operating Tests The inspectors evaluated the adequacy of the facility licensees annual requalification operating test.
Administration of an Annual Requalification Operating Test The inspectors evaluated the effectiveness of the facility licensee in administering requalification operating tests required by 10 CFR 55.59(a)(2) and that the facility licensee is effectively evaluating their licensed operators for mastery of training objectives.
5 Requalification Examination Security The inspectors evaluated the ability of the facility licensee to safeguard examination material, such that the examination is not compromised.
Remedial Training and Re-examinations The inspectors evaluated the effectiveness of remedial training conducted by the licensee, and reviewed the adequacy of re-examinations for licensed operators who did not pass a required requalification examination.
Operator License Conditions The inspectors evaluated the licensees program for ensuring that licensed operators meet the conditions of their licenses.
Control Room Simulator The inspectors evaluated the adequacy of the facility licensees control room simulator in modeling the actual plant, and for meeting the requirements contained in 10 CFR 55.46.
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 a planned reactor down power to 37% RTP and restoration to full power to conduct replacement of the degrading 'C' RCS loop flow transmitter FT-434 on February 13, 2025.
Licensed Operator Requalification Training/Examinations (IP Section 03.02) (1 Sample)
(1)
The inspectors observed and evaluated an annual operator requalification exam simulator scenario on February 4, 2025.
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 (SSCs) remain capable of performing their intended function:
(1) breaker 52/BYC-B1 for 125-volt DC battery charger B-1 tripped open when attempting to place the charger in service [nuclear condition report (NCR) 2535314],
review completed on February 4, 2025 (2) containment purge exhaust valve V12-8 excessive seal leakage identified during testing (NCR 2536588), review completed on February 24, 2025
6 Quality Control (IP Section 03.02) (1 Sample)
The inspectors evaluated the effectiveness of maintenance and quality control activities to ensure the following SSC remains capable of performing its intended function:
(1)
'C' steam generator narrow range level indicator LI-494 failure to calibrate over required indicator range on January 15, 2025 (NCR 2540840) 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 grid risk (Orange) due to anticipated capacity shortage during extreme cold weather on January 23, 2025 (2) elevated risk (Green) during planned power maneuver to 37% RTP to replace degrading 'C' RCS loop flow transmitter FT-434 on February 13, 2025 (3) elevated risk (Green) during planned replacement of the 'A' service water pump/motor on February 17-19, 2025 (4) elevated risk (Green) during planned pump crankcase oil and suction stabilizer relief valve replacement on the 'B' CVCS charging pump on February 26, 2025 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 2533950, momentary isolation of seal water injection to all reactor coolant pumps during 'B' seal water injection filter replacement on January 6, 2025 (2)
NCR 2540120, 'A' service water booster pump oil leak and decreasing oil sight glass level while operating on January 9, 2025 (3)
NCR 2542751, 'C' RCS loop flow transmitter FT-434 degrading performance from gradual decreasing output identified on February 2, 2025 (4)
NCR 2545618, indication of leak by closed 'A' CVCS charging pump recirculation to volume control tank valve CVC-277C on February 27, 2025 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:
7 Post-Maintenance Testing (PMT) (IP Section 03.01) (6 Samples)
(1)
OP-906, Heating, Ventilation, and Air Conditioning, Section 6.1.18, for operation of the safety injection pump area cooling unit HVH-6A, following inspection of fan and cooler on January 29, 2025 (2)
OST-352-2, Containment Spray Component Test - Train B, after Limitorque grease inspection of 'B' containment spray pump suction isolation valve SI-844B on February 4, 2025 (3)
OP-402, Auxiliary Feedwater System (AFW), Section 6.1.3, Testing C AFW Train, after replacement of diesel engine cooling hoses for the 'C' engine driven AFW pump on February 13, 2025 (4)
OP-301B, Chemical and Volume Control System Charging Pump B Operation, Section 6.3.2, Charging Pump B Break-In After Minor Maintenance, and OST-101-2, CVCS Component Test Charging Pump B, following scheduled preventive maintenance on February 26, 2025 (5)
OST-151-3, Safety Injection System Components Test Pump C, following scheduled preventive maintenance on March 19, 2025 (6)
Work Order 20717207 instructions to operate the 'B' turbine electro-hydraulic pump following emergent pump replacement to validate operational performance and satisfactory vibration and bearing temperatures on March 25, 2025 Surveillance Testing (IP Section 03.01) (2 Samples)
(1)
OST-409-1, EDG A Fast Speed Start, on January 29, 2025 (2)
EST-082, ISI Pressure Testing of AFW System, on March 4, 2025 Inservice Testing (IST) (IP Section 03.01) (1 Sample)
(1)
OST-202, SDAFW Component Test, on March 4, 2025 Diverse and Flexible Coping Strategies (FLEX) Testing (IP Section 03.02) (1 Sample)
(1)
OST-454, Fukushima FLEX AFW Pump Skid Testing, on March 17, 2025 71114.06 - Drill Evaluation Additional Drill and/or Training Evolution (1 Sample)
The inspectors evaluated a simulator-based licensed operator annual examination scenario on February 4, 2025.
8 OTHER ACTIVITIES - BASELINE 71151 - Performance Indicator Verification The inspectors verified licensee performance indicators submittals listed below:
MS09: Residual Heat Removal Systems (IP Section 02.08) (1 Sample)
(1)
Unit 2 (January 1, 2024, through December 31, 2024)
MS10: Cooling Water Support Systems (IP Section 02.09) (1 Sample)
(1)
Unit 2 (January 1, 2024, through December 31, 2024)
BI02: RCS Leak Rate Sample (IP Section 02.11) (1 Sample)
(1)
Unit 2 (January 1, 2024, through December 31, 2024) 71152A - Annual Follow-up Problem Identification and Resolution Annual Follow-up of Selected Issues (Section 03.03) (2 Samples)
The inspectors reviewed the licensees implementation of its corrective action program related to the following issues:
(1) excessive resistance experienced during attempts to hand rotate the 'A' and 'B' containment vessel spray pump shafts during system fill and venting following the refueling outage on November 20, 2024 (NCR 2536217).
(2) during unit power ascension from the previous refueling outage, the 2A moisture separator reheater reheat stop valve MS-2RL only opened to 57% versus full open due to failure to reinstall the hydraulic fluid lines correctly following outage-related maintenance (NCR 2537813).
9 INSPECTION RESULTS Minor Performance Deficiency 71152A Failure to Implement Correct Component Verification Minor Performance Deficiency: During the fall 2024 refueling outage, turbine maintenance personnel failed to follow licensee procedures and incorrectly reinstalled two hydraulic actuator connection hose lines on the 2A moisture separator reheater reheat stop valve, MS-2RL. Specifically, licensee procedure AD-HU-ALL-0005, "Human Performance Tools,"
Revision 7, Attachment 6, titled Correct Component Verification, required that if a hard match between the controlling document (in this case, the work order instructions) and equipment identification on the equipment label does not exist, then the performer is to stop and consult with their supervision for guidance. Contrary to this, the turbine maintenance personnel failed to stop and contact their supervisor when identifying temporary paper tags on the hydraulic actuator connection hose lines that were illegible due to water damage and permanent tag labels on the upstream hydraulic isolation valves that were damaged due to sunlight. As a result, maintenance personnel reinstalled the two hydraulic hoses backwards, which caused MS-2RL to open 57% instead of going fully open during the initial power ascension from the refueling outage. Subsequently, the unit was down powered from 96% to 70% to isolate MS-2RL and correct the hose configuration error prior to returning the unit to full power without incident. The inspectors did not identify any violations of regulatory requirements during the review.
Screening: The inspectors determined the performance deficiency was minor. Based on a subsequent licensee evaluation, the misconfiguration would not have prevented MS-2RL from closing as normal during a turbine trip initiation. Therefore, the misconfiguration would not be a precursor to a significant event, would not have the potential to lead to a more significant safety concern, and did not affect the cornerstone objectives documented in Inspector Manual Chapter 0612, Appendix B, dated August 9, 2023.
EXIT MEETINGS AND DEBRIEFS The inspectors verified that no proprietary information was retained or documented in this report.
On February 10, 2025, the inspectors presented the licensed operator requalification inspection results to Laura Basta and other members of the licensee staff.
On April 28, 2025, the inspectors presented the integrated inspection results to Laura Basta and other members of the licensee staff.
10 DOCUMENTS REVIEWED Inspection Procedure Type Designation Description or Title Revision or Date AD-OP-ALL-0120 Severe Weather Preparations and Considerations Rev. 1 AD-OP-RNP-0120 Severe Weather Response Rev. 0 71111.01 Procedures OP-925 Cold Weather Operation Rev. 89 Drawings G-190204A SH00001 Emergency Diesel Generator System Flow Diagram Rev. 040 OP-202 Safety Injection and Containment Vessel Spray System Rev. 109 OP-301 Chemical and Volume Control System Operations and Alignments Rev. 129 OP-604-1 Diesel Generator 'A' Operations Rev. 15 OP-604-2 Diesel Generator 'B' Operations Rev. 13 71111.04 Procedures OP-903 Service Water System Rev. 161 AD-FP-ALL-1520 Transient Combustible Control Rev. 2 CSD-RNP-PFP-AB2-0246-001 Auxiliary Building Elevation 246 Pre-Fire Plan Rev. 1 CSD-RNP-PFP-PA-003 Protected Area Southeast Pre-Fire Plan Rev. 2 CSD-RNP-PFP-PA-006 Protected Area Switchyard and Intake Pre-Fire Plan Rev. 1 Fire Plans FP-012 Fire Protection Systems Minimum Equipment and Compensatory Actions Rev. 40 AD-OP-ALL-0207 Fire Brigade Administrative Controls Rev. 6 AD-TQ-ALL-0086 Fire Brigade and Hazmat Training Rev. 6 CSD-RNP-PFP-SOGS-001 Fire Brigade Standard Operating Guidance Rev. 1 71111.05 Procedures OMM-002 Fire Protection Manual Rev. 59 Engineering Evaluations Reactivity Manipulation Plan RNP Unit 2 Cycle 35 February 2025 FT-434 Failure Rev. 1 AD-OP-ALL-1000 Conduct of Operations Rev. 25 AD-TQ-ALL-0420 Conduct of Simulator Training and Evaluation Rev. 20 71111.11Q Procedures OP-105 Maneuvering the Plant When Greater Than 25% Power Rev. 75 71111.12 Procedures AD-EG-ALL-1210 Maintenance Rule Program Rev. 5
11 Inspection Procedure Type Designation Description or Title Revision or Date AD-OP-ALL-0210 Operational Risk Management Rev. 4 AD-WC-ALL-0200 On-Line Work Management Rev. 22 AD-WC-ALL-0240 On-Line Risk Management Process Rev. 6 71111.13 Procedures CSD-WC-RNP-0240-00 RNP ERAT Guidance Rev. 1 71111.15 Procedures AD-OP-ALL-0105 Operability Determinations Rev. 8 and Rev. 9 71111.24 Procedures PLP-033 Post-Maintenance Testing (PMT) Program Rev. 70 AD-EP-ALL-0111 Control Room Activation of the ERO Rev. 8 AD-EP-ALL-0304 State and County Notifications Rev. 7 71114.06 Procedures CSD-EP-RNP-0101-02 EAL Wallchart (Both Hot and Cold)
Rev. 3 AD-EG-ALL-1217 Mitigating System Performance Index (MSPI)
Rev. 3 71151 Procedures AD-PI-ALL-0700 Performance Indicators Rev. 6 AD-PI-ALL-0100 Corrective Action Program Rev. 30 71152A Procedures AD-PI-ALL-0106 Cause Investigation Checklists Rev. 10