IR 05000261/2025001
| ML25118A320 | |
| Person / Time | |
|---|---|
| Site: | Robinson  (DPR-023) |
| Issue date: | 04/29/2025 |
| From: | Matthew Fannon Division of Operating Reactors |
| To: | Basta L Duke Energy Progress |
| References | |
| IR 2025001 | |
| Download: ML25118A320 (13) | |
Text
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
Inspection Report
Docket Number:
05000261
License Number:
Report Number:
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
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 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
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.
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) 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
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:
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
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)
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,
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) 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)
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).
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,
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.
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-
20
Severe Weather Response
Rev. 0
Procedures
Cold Weather Operation
Rev. 89
Drawings
G-190204A
SH00001
Emergency Diesel Generator System Flow Diagram
Rev. 040
Safety Injection and Containment Vessel Spray System
Rev. 109
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
Procedures
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
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
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
Procedures
Maneuvering the Plant When Greater Than 25% Power
Rev. 75
Procedures
AD-EG-ALL-1210
Rev. 5
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
Procedures
CSD-WC-RNP-
240-00
Rev. 1
Procedures
AD-OP-ALL-0105
Rev. 8 and
Rev. 9
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
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
Procedures
AD-PI-ALL-0106
Cause Investigation Checklists
Rev. 10