IR 05000237/2024001
| ML24121A249 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 05/01/2024 |
| From: | Robert Ruiz NRC/RGN-III/DORS/RPB1 |
| To: | Rhoades D Constellation Energy Generation |
| References | |
| IR 2024001 | |
| Download: ML24121A249 (1) | |
Text
SUBJECT:
DRESDEN NUCLEAR POWER STATION, UNITS 2 AND 3 - INTEGRATED INSPECTION REPORT 05000237/2024001 AND 05000249/2024001
Dear David Rhoades:
On March 31, 2024, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Dresden Nuclear Power station, Units 2 and 3. On April 16, 2024, the NRC inspectors discussed the results of this inspection with C. Joseph, Site Vice President, 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, Robert Ruiz, Chief Reactor Projects Branch 1 Division of Operating Reactor Safety Docket Nos. 05000237 and 05000249 License Nos. DPR-19 and DPR-25
Enclosure:
As stated
Inspection Report
Docket Numbers:
05000237 and 05000249 License Numbers:
DPR-19 and DPR-25 Report Numbers:
05000237/2024001 and 05000249/2024001 Enterprise Identifier:
I-2024-001-0072 Licensee:
Constellation Energy Generation, LLC Facility:
Dresden Nuclear Power station, Units 2 and 3 Location:
Morris, IL Inspection Dates:
January 01, 2024 to March 31, 2024 Inspectors:
A. Anderson, Physical Security Inspector J. Kutlesa, Sr. Emergency Preparedness Inspector K. Maloney, Sr. Physical Security Inspector J. Meszaros, Resident Inspector M. Porfirio, Illinois Emergency Management Agency C. St. Peters, Resident Inspector J. Steffes, Senior Resident Inspector Approved By:
Robert Ruiz, Chief Reactor Projects Branch 1 Division of Operating Reactor Safety
SUMMARY
The U.S. Nuclear Regulatory Commission (NRC) continued monitoring the licensees performance by conducting an integrated inspection at Dresden Nuclear Power station, Units 2 and 3, 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 at rated thermal power. On March 1, 2024, power was reduced to approximately 57 percent to perform rod sequence exchange and scram valve maintenance. The unit returned to rated thermal power the next day and remained at or near rated thermal power for the remainder of the inspection period.
Unit 3 began the inspection period at rated thermal power. On March 8, 2024, power was reduced to approximately 66 percent to perform rod sequence exchange and scram valve maintenance. The unit returned to rated thermal power the next day. On March 14, 2024, the licensee noted a rise in drywell pressure and dual indication of the 1A main steam isolation valve (MSIV). Unit power was reduced to approximately 25 percent to facilitate drywell entry for troubleshooting a repair. Following repairs to the 1A MSIV pneumatic line the unit was returned to rated thermal power on March 16, 2024. On March 17, 2024, unit power was reduced to approximately 81 percent for scram valve maintenance. The unit returned to rated thermal power the same day 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 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 seasonal cold temperatures for the following systems:
Emergency diesel generators (EDGs), ultimate heat sink and associated cooling water systems, station blackout (SBO) diesel generators from January 17 - 19, 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) Unit 3 EDG on January 17 - 18, 2024
- (2) Unit 3 isolation condenser during high pressure coolant injection work window on February 26 - 27, 2024
- (3) Unit 2 EDG while the 2/3 EDG was inoperable for maintenance on March 25 - 26, 2024
71111.05 - Fire Protection
Fire Area Walkdown and Inspection Sample (IP Section 03.01) (3 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) Fire Zone (FZ) 1.1.1.5A Unit 3 isolation condenser area elev. 589' and FZ 1.1.2.5A Unit 2 isolation condenser area elev. 589' on January 4, 2024
- (2) FZ 11.2.1 Unit 2 southwest corner room elev. 476' on January 5, 2024
- (3) FZ 6.2 Unit 2/3 comp room & auxiliary electrical room elev. 517' on January 11, 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 March 14, 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 planned down power for rod sequence exchange, rod recovery, and control rod drive testing on March 1 - 2, 2024.
Licensed Operator Requalification Training/Examinations (IP Section 03.02) (1 Sample)
- (1) The inspectors observed and evaluated an out of the box scenario, CPE OBE A, in the main control room simulator on March 19, 2024.
71111.12 - Maintenance Effectiveness
Maintenance Effectiveness (IP Section 03.01) (1 Sample)
The inspectors evaluated the effectiveness of maintenance to ensure the following structures, systems, and components (SSCs) remain capable of performing their intended function:
- (1) Unit 3 125 volts direct current (VDC) batteries following identification of lid cracking and bulging on the Unit 3 125 VDC batteries
71111.13 - Maintenance Risk Assessments and Emergent Work Control
Risk Assessment and Management Sample (IP Section 03.01) (2 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) Unit 3 plant risk action green and fire risk blue due to planned work window on high pressure coolant injection, on February 26-27, 2024
71111.15 - Operability Determinations and Functionality Assessments
Operability Determination or Functionality Assessment (IP Section 03.01) (6 Samples)
The inspectors evaluated the licensee's justifications and actions associated with the following operability determinations and functionality assessments:
- (1) Main control room heating, ventilation and air conditioning damper not positioning properly during DFPS 4183-14, as documented in CR 4723462
- (2) Unit 3 125 VDC battery cell 23 has crack on lid and lid is lightly bulging out near post, as documented in CR 4730791
- (3) Unit 2 SBO engine "B" oil cooler in low as documented in CR 4730965
- (4) Unit 3 "A" reactor building closed cooling water temperature control valve will not open past 65percent, as documented in CR 4749275
- (5) Unit 2 125 VDC battery charger 2A fluctuating direct current output, as documented in CR 4752128
- (6) Unit 3 SBO jacket water expansion tank level low, as documented in CRs 4741960 and 4741962
71111.18 - Plant Modifications
Temporary Modifications and/or Permanent Modifications (IP Section 03.01 and/or 03.02)
(1 Partial)
The inspectors evaluated the following temporary or permanent modifications:
(1)
(Partial)
The NRC staff completed a review of the licensee's hazard assessment associated with a hypothetical rupture and subsequent release of natural gas of the planned Three Rivers Lateral pipeline lateral to the Dresden Power Station Unit 2 and 3. The results of this review are documented in ADAMS under ML24071A123 and did not identify any safety or regulatory concerns. To complete the sample the inspectors will conduct onsite verification of installation and testing requirements once the pipeline construction is completed to ensure hazard analysis assumptions.
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) (3 Samples)
===5278040-02
- (2) Unit 2 control rod drives H-12, K-4, N-9, K-14, and H-9 testing following diaphragm replacement, per WO 5481697
- (3) Unit 3 drywell pneumatic air flow qualitative air leakage assessment following emergent work on the 1A MSIV air manifold, per WO 5518072 Surveillance Testing (IP Section 03.01)===
- (1) DOS 6600-01, 2/3 Emergency Diesel Generator monthly surveillance test, on March 27, 2024
Inservice Testing (IST) (IP Section 03.01) (1 Sample)
- (1) Unit 3 DOS 2300-03, High Pressure Coolant Injection System Operability and Quarterly IST Verification Test, per WO 5425673
71114.02 - Alert and Notification System Testing
Inspection Review (IP Section 02.01-02.04) (1 Sample)
- (1) The inspectors evaluated the following maintenance and testing of the alert and notification system:
- Annual siren inspection and maintenance records for the period of March 2022 to March 2024.
- Weekly alert notification system (siren) tests for the period of March 2022 to March 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.
71114.05 - 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.
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 (January 1, 2023 through December 31, 2023)
- (2) Unit 3 (January 1, 2023 through December 31, 2023)
IE03: Unplanned Power Changes per 7000 Critical Hours Sample (IP Section 02.02) (2 Samples)
- (1) Unit 2 (January 1, 2023 through December 31, 2023)
- (2) Unit 3 (January 1, 2023 through December 31, 2023)
IE04: Unplanned Scrams with Complications (USwC) Sample (IP Section 02.03) (2 Samples)
- (1) Unit 2 (January 1, 2023 through December 31, 2023)
- (2) Unit 3 (January 1, 2023 through December 31, 2023)
EP01: Drill/Exercise Performance (DEP) Sample (IP Section 02.12) (1 Sample)
- (1) January 01, 2022 through December 31, 2023.
EP02: Emergency Response Organization (ERO) Drill Participation (IP Section 02.13) (1 Sample)
- (1) January 01, 2022 through December 31, 2023.
EP03: Alert and Notification System (ANS) Reliability Sample (IP Section 02.14) (1 Sample)
- (1) January 01, 2022 through December 31,
INSPECTION RESULTS
No findings were identified.
EXIT MEETINGS AND DEBRIEFS
The inspectors verified no proprietary information was retained or documented in this report.
- On April 16, 2024, the inspectors presented the integrated inspection results to C. Joseph, Site Vice President, and other members of the licensee staff.
- On March 29, 2024, the inspectors presented the Emergency Preparedness inspection results to H. Patel and other members of the licensee staff.
DOCUMENTS REVIEWED
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
DOS 0010-19
Preparation for Cold Weather Operations for Unit 1 and Out
Buildings
DOS 0010-22
Preparation for Cold Weather Operations for Unit 2
DOS 0010-25
Preparation for Cold Weather Operations for Unit 3
Procedures
OP-DR-108-111-
1004
Cold Weather Strategy
Corrective Action
Documents
Resulting from
Inspection
4760987
NRC Question: U2 EDG Room Walkdown
03/25/2024
M-173
Diagram of Corrosion Test and Diesel Start-up Air Piping
BJ
M-22
Diagram of Service Water Piping
M-41
Diagram of Turbine and Diesel Oil Piping
AI
M-478
Diagram of Diesel Generator Lube Oil Piping
J
M-517
Diesel Generator Engine Coolant Water System
J
M-517
Diesel Generator Engine Cooling Water System
I
M-518
Diesel Generator Fuel Oil System
F
Drawings
M-518
Diesel Generator Fuel Oil System
G
DOP 1300-M1/E1
Unit 3 Isolation Condenser System Checklist
DOP 6600-01
Diesel Generator 2(3) Preparation for Standby Operation
DOP 6600-M1
Unit 2 Standby Diesel Generator
Procedures
DOS 6600-M1
Unit 3 Standby Diesel Generator Checklist
100 Pre-fire Plan
Master Legend
Dresden Generating Station Pre-Fire Plan
2 U2RB-2
FZ 11.2.1 Unit 2 Southwest Corner Room Elev. 476'
115 U2RB-12
FZ 1.1.2.5A Unit 2 Isolation Condenser Area Elev. 589'
131 U3RB-31
FZ 1.1.1.5A Unit 3 Isolation Condenser Area Elev. 589'
143 U2TB-46
FZ 6.2 Unit 2/3 Comp Room & Auxiliary Electrical Room
Elev. 517'
Fire Plans
173 U3TB-84
FZ 8.2.8A Unit 3 Main Turbine Floor Eleve. 561'
Miscellaneous
DR-CM-35
Development of Risk Management Actions for the Inclusion
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
of Fire Insights into Dresden Nuclear Power Station
Configuration Risk Management Program
Fire Drill Scenario
24-02
Turbine Services Office Fire U3 TB 561'
03/14/2024
ER-DR-600-1069
Dresden Units 2 & 3 Site List of High Risk Fire Areas
Procedures
Fire Protection Impairment Control
Miscellaneous
Dresden Unit 2 - D2 1st Quarter 2024 Load Drop Profile
03/1/2024
NF-AB-720-F-5
Special Maneuver Rod Move Sheet
OP-AA-101-113-
1006
2, Operator Fundamentals Coding Matrix
Procedures
ReMA First Quarter 2024 Load Drop
4683379
U3 125VDC Alternate Battery Cell 12 Crack on Positive Post
06/08/2023
4692463
U3 125VDC Main Battery Cracks
07/25/2023
4692472
U3 125VDC Alternate Battery Cracks
07/25/2023
4696927
U3 125 VDC Alt Battery Cell #2 Detectable Leak
08/16/2023
4702635
Surface Crack on Battery Cell Lid
09/14/2023
Corrective Action
Documents
27513
Leak on U3 125VDC Alt Battery Cell Number 2
01/08/2024
Miscellaneous
System Health
Report
AC/DC Distribution System Health Report
01/12/2024
DOS 8300-01
Unit 2(3) Weekly Station Battery Inspection
Procedures
DOS 8300-17
Unit 2(3) Quarterly Station Battery Inspection
5412586
OP D3 Qtr TS Alt 125V DC Station Battery Surveillance
(In Lieu of wkly/mnt)
2/7/2023
Work Orders
5412598
OP D3 IM PM TSNC 125 VDC Station Battery Inspection
11/23/2023
4758041
Unit 3 DW Pressure Response
03/14/2024
Corrective Action
Documents
4759564
MSIV 3-0203-1A pneumatic leak (Failed Airline and O-Ring)
03/14/2024
OP-AA-101-113-
1004
Prompt Investigation
Protected Equipment List
2/26/2024
OP-DR-201-012-
1001
Dresden On-Line Fire Risk Management
Procedures
On-Line Risk Management and Assessment
Corrective Action
4395594
U2 125VDC Battery Charger 2A Fluctuating DC Output
01/13/2021
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
Current
4396948
U2 125VDC Battery Charger 2A Fluctuating DC Output
Current
01/20/2021
4533410
10/30/2022
4540705
3A RBCCW TCV will Not Open Past 65%
2/04/2022
23462
MCR HVAC Not Positioning Properly during DFPS 4183-14
2/14/2023
4730791
Unit 3 125 VDC Battery Cell 23 Has Crack on Lid and Lid is
Lightly Bulging out Near +Post
01/4/2024
4749275
3A RBCCW TCV will Not Open Past 65%
2/11/2024
Documents
4752128
U2 125VDC Battery Charger 2A Fluctuating DC Output
Current
2/21/2024
Miscellaneous
DAN 223-89 B-3
Cont Rm/East Turb Bldg Ductwork Smoke Detected
DFPS 4183-14
Unit 2/3 Control Room HVAC Smoke Detector Annual
Surveillance Procedure
Procedures
DOP 3700-02
Reactor Building Closed Cooling Water System Operation
5105466
25VDC Station Battery Inspection
01/13/2021
Work Orders
5115597
U2 125VDC Battery Charger 2A Fluctuating DC Output
Current
01/14/2021
Corrective Action
Documents
4493791
U3 SBO Engine A Lube Oil Sump Level Lo Alarm
04/18/2022
DMP 0200-05
Main Steam Isolation Valve Operator Air Manifold
Replacement and Air Operator Testing
DOS 0300-14
Control Rod Drive Scram Testing At Power
DOS 4700-02
Drywell Pneumatic Air Flow Qualitative Air Leakage
Assessment
DOS 6600-01
Diesel Generator Surveillance Tests
148
Procedures
Post Maintenance Testing
1901879
Op Open/Close Breakers 3-6771-4, Bus 34 Feed ESS Div II
+ PMT
01/10/2024
1905271
EM Swap SBO Diesel Generator 3 Feed 3-6771-1
01/8/2024
5052618
Op PMT 3B SBO Start Air Part Filter 3-4680-7B for Leaks
01/12/2024
269522
OP D3 2Y PM HPCI Fast Initiation Test
2/29/2024
Work Orders
278040
D3 2Y PM SBO Mechanical Maintenance Inspection
2/03/2024
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
29595
Diesel Fuel Oil Leak on Fitting Return Line for U3 SBO
2/03/2024
5385644
U3 SBO Engine A Lube Oil Sump Level Lo Alarm
2/03/2024
5407889
D3 Qtr Com SBO Diesel Generator Surveillance
2/03/2024
25673
OP D3 Quarterly TS HPCI Pump Operability Test and IST
Surveillance
2/29/2024
5481697
Need a WO to replace U2 SSPV Diaphragms
03/01/2024
5518072-5
MM Install New O-Rings AVCO Mnfld ASM (OPCC)
03/15/2024
5518072-7
Ops PMT 1A MSIV After O-Ring Replacement
3/16/2024
N/A
Dresden Monthly Siren Availability Report (Telemetry)
January
22 through
December
23
Miscellaneous
N/A
Exelon Mid-West Siren Status Report
January
22 through
December
23
Calculations
Addendum 1
Dresden Station On-Shift Staffing Technical Basis
Rev 02
Miscellaneous
N/A
Quarterly Call-In Augmentation Drill Results
1st Qtr 2022
- 4th Qtr
23
Exelon Nuclear Radiological Emergency Plan Annex for
Dresden Station
Rev 39
Procedures
Dresden Station Radiological Emergency Plan
Rev 0
Calculations
KLD TR - 1252
DRESDEN GENERATING STATION Development of
Evacuation Time Estimates
07/25/2022
Miscellaneous
Letters of
Agreement
Coal City Fire Protection District; GE Morris Facility; Grundy
County Sherriff; Morris Hospital; Presence St. Joseph
Medical Center; US Army Corp of Engineers
Various
Procedures
EP-DR-124-F-
01/02/03
Inventories: TSC, OSC, Control Room
January
22 through
December
23
Self-Assessments NOSA-DRE-22-
Emergency Preparedness Audit
04/25/2022
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
NRC Performance Indicator Data: Initiating Events -
Unplanned Power Changes per 7000 Critical Hours
01/01/2023-
2/31/2023
NRC Performance Indicator Data: Initiating Events -
Unit/Reactor Shutdown Occurrences
01/01/2023-
2/31/2023
Monthly Data Elements for NRC ROP Indicator - Emergency
Response Organization (ERO) Drill Participation
1st Qtr 2022
- 4th Qtr
23
Monthly Data Elements for NRC ROP Indicator -
Drill/Exercise Performance
1st Qtr 2022
- 4th Qtr
23
71151
Miscellaneous
Monthly Data Elements for NRC ROP Indicator - Alert and
Notification System Reliability
1st Qtr 2022
- 4th Qtr
23