IR 05000261/2024003
| ML24303A343 | |
| Person / Time | |
|---|---|
| Site: | Robinson  |
| Issue date: | 10/30/2024 |
| From: | Matthew Fannon NRC/RGN-II/DORS/PB2 |
| To: | Basta L Duke Energy Progress |
| References | |
| IR 2024003 | |
| Download: ML24303A343 (1) | |
Text
SUBJECT:
H.B. ROBINSON STEAM ELECTRIC PLANT - INTEGRATED INSPECTION REPORT 05000261/2024003
Dear Laura Basta:
On September 30, 2024, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at H.B. Robinson Steam Electric Plant. On October 17, 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, 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-2024-003-0026
Licensee:
Duke Energy Progress, LLC
Facility:
H.B. Robinson Steam Electric Plant
Location:
Hartsville, SC
Inspection Dates:
July 01, 2024 to September 30, 2024
Inspectors:
V. Gaffney, Resident Inspector
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 operated at or near rated thermal power (RTP) for the entire duration of the 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) (3 Samples)
- (1) The inspectors evaluated the adequacy of the overall preparations to protect risk-significant systems from impending severe weather for Tropical Storm Debby on August 5-8, 2024.
- (2) The inspectors evaluated the adequacy of the overall preparations to protect risk-significant systems from impending severe weather for tropical cyclone #8 on September 16, 2024.
- (3) The inspectors evaluated the adequacy of the overall preparations to protect risk-significant systems from impending severe weather for Tropical Storm Helene on September 26-27, 2024.
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)
'B' motor driven auxiliary feedwater (MDAFW) pump and steam driven auxiliary feedwater (SDAFW) pump while 'A' MDAFW pump was out of service for preventive maintenance on July 30, 2024 (2)
'B' spent fuel pool cooling (SFPC) pump while 'A' SFPC pump was out of service due to emergent loss of oil from the pump drive on August 4, 2024 (3)
'A' and 'B' chemical and volume control system (CVCS) charging pumps while the 'C' CVCS charging pump was out of service for emergent failure to start on August 20, 2024 (4)
'A' MDAFW pump and 'C' diesel driven AFW pump while the SDAFW pump was out of service for preventive maintenance on September 3, 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)spent fuel pool storage area on fuel handling building elevation 275 (fire zone 28A) on July 21, 2024 (2)
'A' and 'B' vital battery room (fire zone 16) on July 25, 2024
- (3) SDAFW pump area on turbine building elevation 226 (fire zone 25B) on July 30, 2024 (4)
'A' emergency diesel generator (EDG) room (fire zone 2) on August 7, 2024 (5)control room heating, ventilation, and air conditioning equipment room (fire zone 17)on September 12, 2024
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 September 12, 2024.
71111.06 - Flood Protection Measures
Flooding Sample (IP Section 03.01) (2 Samples)
- (1) The inspectors evaluated external flooding mitigation protections in manhole cable vaults M-50A and M-50B for the service water pump motors on July 8, 2024.
- (2) The inspectors evaluated external flooding mitigation protections associated with the Lake Robinson Dam spillway (Tainter) gates and post-modification testing of the 'B' Tainter gate and hoist system following replacement on August 21, 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 a planned reactor down power to 98.5% RTP and restoration to full power to conduct 'A' MDAFW pump testing on July 30, 2024.
Licensed Operator Requalification Training/Examinations (IP Section 03.02) (1 Sample)
- (1) The inspectors observed and evaluated a licensed operator requalification simulator training scenario on July 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 (SSCs) remain capable of performing their intended function:
(1)
'A' CVCS charging pump failure due to faulted motor on June 13, 2024 [nuclear condition report (NCR) 2519275]
(2)
'A' SFPC pump motor breaker found tripped on electrical overload fault on July 18, 2024 (NCR 2522791)
Aging Management (IP Section 03.03) (1 Sample)
The inspectors evaluated the effectiveness of the aging management program for the following SSCs that did not meet their inspection or test acceptance criteria:
(1)degraded wall penetration insulation due to fire/heat in 'A' EDG exhaust piping (NCR
===2520936)
71111.13 - Maintenance Risk Assessments and Emergent Work Control
Risk Assessment and Management Sample (IP Section 03.01)===
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 corrective maintenance to replace suspected broken pump valve spring on the 'A' CVCS charging pump on July 9-10, 2024 (2)elevated risk (Green) during planned preventive maintenance on 'A' MDAFW pump and valves on July 30, 2024 (3)elevated risk (Green) during emergent troubleshooting to repair the 'C' CVCS charging pump due to failure to start on August 20, 2024 (4)elevated risk (Green) during planned pump and valve preventive maintenance on the SDAFW pump on September 3, 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 2518201, 'A' reactor coolant pump excessive #3 seal leak-by causing frequent standpipe low level alarms beginning mid-June, 2024
- (2) NCR 2522219, 'A' EDG electrical metal junction box containing governor control wiring contacting bare engine exhaust manifold, review completed July 22, 2024
- (3) NCR 2524500, 'A' SFPC pump significant decrease in oil level identified following pump rebuild maintenance on August 4, 2024
- (4) NCR 2527908, minor reactor coolant system pressure control perturbations exhibited on September 6, 2024
- (5) NCR 2529132, 'B' EDG governor speed setting found changed from 13.60 to 13.36 on September 21, 2024
71111.18 - Plant Modifications
Temporary Modifications and/or Permanent Modifications (IP Section 03.01 and/or 03.02) (2 Samples)
The inspectors evaluated the following temporary or permanent modifications:
(1)engineering change (EC) 420743, replace 'B' instrument air compressor dryer
- (2) EC 415523, Lake Robinson spillway Tainter gate and hoist replacement (specific to
'B' Tainter gate)
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) (7 Samples)
- (1) OST-201-1, MDAFW System Component Test - Train A, following preventive maintenance on 'A' MDAFW pump on July 30, 2024
- (2) Work Order (WO) 20651495 instructions for blowing down instrument sensing lines for 'A' train service water supply header pressure on July 31, 2024
- (3) OST-402, Auxiliary Feedwater System, Section 6.1.3, Testing C AFW Train, following preventive maintenance on the 'C' diesel driven AFW pump on August 20, 2024
- (4) OST-101.3, CVCS Component Test Charging Pump 'C', following corrective maintenance to restore oil prime in pump gyrol fluid drive unit on August 20, 2024
- (5) OST-551-2, Turbine Trip Functional Test, following corrective maintenance to disassemble and clean turbine trip Quadvoter solenoid operated valve EV-4459D on August 26, 2024
- (6) OP-306, Component Cooling Water System, Section 6.2.1, Operating CCW Pumps, following lubrication preventive maintenance on the 'A' CCW pump on September 16, 2024
- (7) OP-903, Service Water System, Section 6.2.1 for swapping operating service water booster pump (SWBP) from 'B' pump to 'A' pump following 'A' SWBP lubrication preventive maintenance on September 25, 2024
Surveillance Testing (IP Section 03.01) (2 Samples)
- (1) OST-409-1, EDG A Fast Speed Start, on August 1, 2024
- (2) OST-202, Steam Driven Auxiliary Feedwater System Component Test, on September 3, 2024
Inservice Testing (IST) (IP Section 03.01) (1 Sample)
- (1) OST-207, Comprehensive Flow Test for the MDAFW Pumps, on July 30, 2024
71114.06 - Drill Evaluation
Additional Drill and/or Training Evolution (1 Sample)
The inspectors evaluated:
- (1) A simulator-based licensed operator training scenario on July 24,
OTHER ACTIVITIES - BASELINE
===71151 - Performance Indicator Verification The inspectors verified licensee performance indicators submittals listed below:
IE01: Unplanned Scrams per 7000 Critical Hours Sample (IP Section 02.01)===
- (1) Unit 2 (July 1, 2023, through June 30, 2024)
IE03: Unplanned Power Changes per 7000 Critical Hours Sample (IP Section 02.02) (1 Sample)
- (1) Unit 2 (July 1, 2023, through June 30, 2024)
MS08: Heat Removal Systems (IP Section 02.07) (1 Sample)
- (1) Unit 2 (July 1, 2023, through June 30, 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)fire in the wall penetration insulation surrounding the 'A' EDG exhaust piping (NCR 2520936)
- (2) Robinson site clearance and tagging adverse trend identified (NCR 2522397)
INSPECTION RESULTS
No findings were identified.
EXIT MEETINGS AND DEBRIEFS
The inspectors verified no proprietary information was retained or documented in this report.
- On October 17, 2024, 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. 0
AD-OP-RNP-
20
Severe Weather Response
Rev. 0
Procedures
Lake Robinson Spillway Equipment
Rev. 23
Chemical and Volume Control Systems Operation and
Alignments
Rev. 128
Auxiliary Feedwater System
Rev. 17
Procedures
Spent Fuel Pit Cooling and Purification System
Rev. 52
CSD-RNP-PFP-
AB2-0226-01
Auxiliary Building Elevation 226 Pre-Fire Plan
Rev. 3
CSD-RNP-PFP-
AB2-0246-001
Auxiliary Building Elevation 246 Pre-Fire Plan
Rev. 1
CSD-RNP-PFP-
FB2-0226-001
Fuel Handling Building Elevation 226 Pre-Fire Plan
Rev. 0
Fire Plans
CSD-RNP-PFP-
TB2-0226-001
Turbine Building Elevation 226 Pre-Fire Plan
Rev. 2
AD-FP-ALL-1520
Transient Combustible Control
Rev. 2
AD-FP-ALL-1551
Fire Protection Impairments
Rev. 2
AD-OP-ALL-0207
Fire Brigade Administrative Controls
Rev. 6
AD-TQ-ALL-0086
Fire Brigade and Hazmat Training
Rev. 6
Response to Fire Event
Rev. 17
CSD-RNP-PFP-
SOGS-001
Fire Brigade Standard Operating Guidance
Rev. 1
Fire Protection Systems Minimum Equipment and
Compensatory Actions
Rev. 39
OMM-002
Fire Protection Manual
Rev. 58
Procedures
Heating, Ventilation, and Air Conditioning
Rev. 100
Engineering
Changes
'B' Tainter Gate Replacement Modification Test Plan
8/21/2024
Work Orders
Inspect M50A and M50B buried cables
7/8/2024
AD-OP-ALL-1000
Conduct of Operations
Rev. 23
Procedures
AD-TQ-ALL-0420
Conduct of Simulator Training and Evaluation
Rev. 20
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
Maneuvering the Plant When Greater than 25% Power
Rev. 74
Procedures
AD-EG-ALL-1210
Rev. 5
AD-WC-ALL-
200
On-Line Work Management
Rev. 22
AD-WC-ALL-
240
On-Line Risk Management Process
Rev. 6
CSD-WC-RNP-
240-00
Rev. 1
Procedures
OMM-048
Work Coordination and Risk Assessment
Rev. 71
Procedures
AD-OP-ALL-0105
Rev. 7
AD-EG-ALL-1110
Design Review Requirements
Rev. 11
AD-EG-ALL-1122
Failure Modes and Effects Analysis and Single Failure
Analysis
Rev. 2
AD-EG-ALL-1132
Preparation and Control of Engineering Changes
Rev. 27
Procedures
AD-EG-ALL-1137
Engineering Change Product Selection
Rev. 12
Procedures
PLP-033
Post-Maintenance Testing (PMT) Program
Rev. 70
AD-EP-ALL-0101
Emergency Classification
Rev. 5
AD-EP-ALL-0105
Activation and Operation of the Technical Support Center
Rev. 13
AD-EP-ALL-0111
Control Room Activation of the ERO
Rev. 8
AD-EP-ALL-0304
State and County Notifications
Rev. 7
AD-EP-RNP-
0105
Rev. 4
Procedures
CSD-EP-RNP-
0101-02
EAL Wallchart
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
AD-PI-ALL-0106
Cause Investigation Checklists
Rev. 10
Procedures
AD-PI-ALL-0200
Performance Trending
Rev. 14