IR 05000346/2023002
| ML23208A100 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 07/27/2023 |
| From: | Karla Stoedter NRC/RGN-III/DORS/RPB2 |
| To: | Tony Brown Energy Harbor Nuclear Corp |
| References | |
| IR 2023002 | |
| Download: ML23208A100 (1) | |
Text
SUBJECT:
DAVIS-BESSE NUCLEAR POWER STATION-INTEGRATED INSPECTION REPORT 05000346/2023002
Dear Terry Brown:
On June 30, 2023, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Davis-Besse Nuclear Power Station. On July 25, 2023, 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, Karla K. Stoedter, Chief Reactor Projects Branch 2 Division of Operating Reactor Safety Docket No. 05000346 License No. NPF-3
Enclosure:
As stated
Inspection Report
Docket Number:
05000346
License Number:
Report Number:
Enterprise Identifier:
I2023002-0052
Licensee:
Energy Harbor Nuclear Corp.
Facility:
Davis-Besse Nuclear Power Station
Location:
Oak Harbor, OH
Inspection Dates:
April 01, 2023 to June 30, 2023
Inspectors:
K. Barclay, Senior Reactor Inspector
T. Briley, Senior Project Engineer
R. Cassara, Acting Senior Resident Inspector
R. Elliott, Senior Project Engineer
D. Mills, Technical Assistant
R. Ng, Senior Project Engineer
Approved By:
Karla K. Stoedter, Chief
Reactor 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 Davis-Besse Nuclear Power Station, 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
Type Issue Number Title Report Section Status URI 05000346/202105006 Potential Adverse Changes During 2006 Emergency Diesel Generator Modifications 71111.21M Discussed
PLANT STATUS
The unit began the inspection period at rated thermal power. On May 31, 2023, the unit was down powered to 95 percent to perform control rod drive and turbine valve testing. The unit was returned to rated thermal power on June 1, 2023, and remained at or near rated thermal power 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 onsite 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 mayfly seasonal preparations for the following systems:
service water system
emergency diesel generator (EDG)
control room emergency ventilation system
71111.04 - Equipment Alignment
Partial Walkdown Sample (IP Section 03.01) (2 Samples)
The inspectors evaluated system configurations during partial walkdowns of the following systems/trains:
- (1) Emergency ventilation system train 2 while train 1 was inoperable during the week ending May 27, 2023
- (2) Auxiliary feedwater train 2 during surveillance on train 1 during the week ending June 17, 2023
Complete Walkdown Sample (IP Section 03.02) (1 Sample)
- (1) The inspectors evaluated system configurations during a complete walkdown of the decay heat system during the week ending June 30, 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) Emergency core cooling system pump room 11, room 105, fire area AB01, during the week ending May 27, 2023
- (2) Station blackout diesel generator and associated electrical equipment and fuel oil storage tank rooms during the week ending May 27, 2023
- (3) Radwaste exhaust equipment and main station exhaust fan room, radwaste and fuel handling areas air supply equipment area, purge exhaust equipment room, rooms 501 and 501DC, 500, and 515, fire area EE, during the week ending May 27, 2023
- (4) Main feedwater pump room, room 252, fire area II, during maintenance on auxiliary feed train 1 with motor driven feed pump protected during the week ending June 17, 2023
- (5) Makeup pump room and vestibule, room 225 and 226A, fire area AB during the week ending June 30, 2023
Fire Brigade Drill Performance Sample (IP Section 03.02) (1 Sample)
- (1) The inspectors evaluated the onsite fire brigade training and performance during an announced fire drill on May 6, 2023
71111.06 - Flood Protection Measures
Flooding Sample (IP Section 03.01) (1 Sample)
- (1) The inspectors evaluated internal flooding mitigation protections in the: emergency feedwater facility and manhole 3005 inspection during the week ending May 27, 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) (2 Samples)
- (1) The inspectors observed and evaluated licensed operator performance in the control room during an observation during power reduction and feedwater loop demands in hand for delta cold leg temperature integrated controller system module replacement during the week ending April 29, 2023
- (2) The inspectors observed and evaluated licensed operator performance in the control room during power reduction, control rod drive testing, and turbine stop valve testing during the week ending June 3, 2023
71111.12 - Maintenance Effectiveness
Maintenance Effectiveness (IP Section 03.01) (3 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) Structural integrity of watertight door used to maintain operability of service water system during the week ending April 29, 2023
- (2) Station vent normal radiation monitor train 2 pump and pressure transmitter replacement during the week ending May 6, 2023
- (3) Diesel fire pump scheduled maintenance outage during the week ending June 24, 2023
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) Weekly elevated risk during multiple planned half trip conditions during the week ending April 15, 2023
- (2) Risk assessment for station air compressor 2 outage during the week ending May 13, 2023
- (3) Anticipatory reactor trip system channel 4 isolation card not locked in properly during the week ending May 20, 2023
- (4) Safety features actuation system (SFAS) channel 2 issue during the week ending May 27, 2023
71111.15 - Operability Determinations and Functionality Assessments
Operability Determination or Functionality Assessment (IP Section 03.01) (2 Samples)
The inspectors evaluated the licensee's justifications and actions associated with the following operability determinations and functionality assessments:
- (1) Radiation element RE 4596BA low flow sample test failure operability determination during the week ending May 6, 2023
- (2) SFAS channel 2 power supply failure, CR 202304281 during the week ending May 27, 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) (9 Samples)
- (1) Motor driven feed pump lube oil cooler during the week ending April 15, 2023
- (2) Station air compressor 2 after scheduled maintenance during the week ending May 13, 2023
- (3) Control room emergency ventilation system after scheduled maintenance during the week ending May 20, 2023
- (4) SFAS channel 2 after power supply replacement during the week ending May 27, 2023
- (5) Boric acid flow transmitter after replacement during the week ending May 27, 2023
- (6) Station blackout diesel generator after scheduled maintenance during the week ending June 17, 2023
- (7) Steam feed rupture control system channel 2 after replacing signal monitor during the week ending June 24, 2023
- (8) EDG 1 after scheduled maintenance during the week ending June 24, 2023
- (9) Diesel fire pump following scheduled maintenance during the week ending June 30, 2023
Surveillance Testing (IP Section 03.01) (4 Samples)
- (1) Steam and feedwater rupture control system steam generator level input channel functional test and device calibration, April 10, 2023
- (2) EDG 1 monthly test during the week ending April 29, 2023
- (3) Auxiliary feedwater train 2 quarterly test during the week ending May 6, 2023
- (4) Station blackout diesel generator monthly tests during the week ending June 17, 2023
Inservice Testing (IST) (IP Section 03.01) (2 Samples)
- (1) Motor driven feed pump quarterly test during the week ending April 15, 2023
- (2) Containment isolation valve 2001 clean and inspect and inservice testing during the week ending May 20, 2023
Diverse and Flexible Coping Strategies (FLEX) Testing (IP Section 03.02) (1 Sample)
- (1) Quarterly functional test of turbo-marine diesel FLEX generators during the week ending May 13,
INSPECTION RESULTS
URI (Discussed)
Potential Adverse Changes During 2006 Emergency Diesel Generator Modifications URI 05000346/202105006 71111.21M
Description:
The NRC continues to evaluate an unresolved item documented in inspection report 202105006 (ADAMS Accession Number ML21348A767). Generally, the staff is assessing the adequacy of the sites modification associated with the installation of the EDG field flash selector switches.
EXIT MEETINGS AND DEBRIEFS
The inspectors verified no proprietary information was retained or documented in this report.
On July 25, 2023, the inspectors presented the integrated inspection results to T. Brown, Site Vice President, and other members of the licensee staff.
DOCUMENTS REVIEWED
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
Procedures
DBOP06913
Seasonal Plant Preparation Checklist
Drawings
OS0004
Decay Heat Removal/ Low-Pressure Injection System
DBOP06012
Decay Heat and Low-Pressure Injection System Operating
Procedure
DBOP06233
Auxiliary Feedwater System
DBOP06504
Emergency Ventilation System
Procedures
DBSP03162
Auxiliary Feedwater Train 2 Monthly Valve Verification
ECCS Pump Room 101, Rooms 105, Fire Area AB01
Makeup Pump Room and Vestibule Room 225 and 226A Fire
Area AB
Radwaste and Fuel Handling Areas Air Supply Equipment
Area - Room 500, Fire Area EE
Radwaste Exhaust Equipment and Main Station Exhaust Fan
Room - Room 501 and 501DC, Fire Area EE
Purge Exhaust Equipment Room - Room 515, Fire Area EE
PFP-S60000
Service Building 6, Laydown Area, Station Blackout Diesel
Fire Plans
Main Feedwater Pump Room (West Condenser Pit) Room 252
Fire Area II
Procedures
NGDB00302
201810082
Emergency Feedwater Building Leak
11/12/2018
Corrective Action
Documents
2200870
Water Leak from Emergency Feedwater Ductwork
2/05/2022
Corrective Action
Documents
2303533
Course RCS Tave Control with FW Demand in Manual
Miscellaneous
System Status
DBOP6902 - Small Power Reduction to Support Controller
Work
04/25/2023
200856520
Main Turbine Stop Valves Periodic Test
05/31/2023
200856520
Main Turbine Stop Valves Periodic Test
05/31/2023
200856521
05/31/2023
200856522
Main Turbine CIV Test
05/31/2023
Work Orders
200901017
CRD Exercise Test
05/31/2023
Procedures
DBMI03417
Channel Calibration of RE4598BA Station Vent Normal Range
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
Radiation Monitor Channel 2
200730894
Doors and Hatches, Top and Bottom Latches are Worn
04/22/2023
200848410
PM 1378 1 Year Inspection Diesel Fire Pump 11
04/27/2023
Work Orders
200913869
Station Vent Radiation Monitoring
05/04/2023
Miscellaneous
String Work Package Cover Sheet
2, 23, 24
Procedures
DBMI03246
Channel Functional Test and Device Calibration of SFRCS
Steam Generator Level Inputs 83C-ISLSP9A8, A9, B6 and B7
to Actuation Channel 2
200848840
SFRCS ACH 2 SG Level Functional Test
04/10/2023
200914582
ARTS Channel 4 Isolation Card in C5784D
05/12/2023
Work Orders
200915830
Unexpected Computer Alarms for SFAS Chanel 2 Q932,
Q852, Q952, Q916, Q904, Q912, Q908, Q956, Q936, Q924
05/23/2023
2303683
RIC4598BAC Operate LED Failed to Extinguish During Low
Flow Test
Corrective Action
Documents
2304281
SFAS Channel 2 Output Modules Tripped
05/22/2023
E16 SH. 2
SFAS Signal Diagram
Drawings
E6 SH. 1
SFAS Logic Diagram
Miscellaneous
NOP-ER3001
Simple Troubleshooting Plan
Procedures
DBOP06405
SFAS Procedure
Engineering
Changes
ECR 050095-00
EDG Loading Improvements
Drawings
M0060
Auxiliary Feedwater System
String Work Package
2/22/2021
String Work Package
2/22/2021
String Work Package
2/22/2021
String Work Package
2/22/2021
Miscellaneous
LYSP9A7
Steam Generator 2 Startup Level Signal Monitor
DBMI03245
Channel Functional Test and Device Calibration of SFRCS
Steam Generator Level Inputs 83C-ISLSP9A6, A7, B8 and B9
to Actuation Channel 1
Procedures
DBSS03091
Motor Driven Feed Pump Quarterly Test
200669088
Replace SAIC Signal Monitors
05/22/2023
Work Orders
200713508
PM 0747 MV2001 RPS/SFAS Channel 2
05/15/2023
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
200731257
PM 11824 SAC2 8000 Hour Maintenance
05/26/2023
200757790
PM 11743 SAC2 4000 Hour Maintenance
05/26/2023
200844093
MDFP Lube Oil Cooler Lean and Inspect MDFP Coolers
04/11/2023
200844588
FLEX Diesel Run
05/12/2023
200845278
Motor Driven Feed Pump Motor Testing
04/11/2023
200847222
Lube Oil Sample, Diesel Fire Pump Test
04/12/2023
200848410
Diesel Fire Pump
04/27/2023
200848816
SBODG Monthly Test
04/15/2023
200848870
Motor Driven Feed Pump Quarterly Test
04/11/2023
200850881
HVAC Control Room
05/15/2023
200851366
EDG Monthly Test
04/27/2023
200851371
RE4598BA Functional Test
05/04/2023
200851426
AFP 2 Quarterly Test
05/02/2023
200852327
CTRM EVS Train 1
05/15/2023
200856879
SBODG Monthly Test
06/05/2023
200857600
SFRCS ACH 1 SG level Functional Test
06/20/2023
200900547
Makeup and Letdown System
05/24/2023
200915631
Remove Insulation and Heat Trace from FTMU39A
05/23/2023
200915830
SFAS Channel 2
05/23/2023
200918226
EDG 1 184 Day Test
06/21/2023