IR 05000237/2024010

NRC Age-Related Degradation Inspection Report 05000237/2024010 and 05000249/2024010

ML24220A241
Person / Time
Site:
Issue date:	08/09/2024
From:	Karla Stoedter NRC/RGN-III/DORS/EB1
To:	Rhoades D Constellation Energy Generation, Constellation Nuclear
References
IR 2024010
Download: ML24220A241 (1)

Text

SUBJECT:

DRESDEN NUCLEAR POWER STATION - NRC AGE-RELATED DEGRADATION INSPECTION REPORT 05000237/2024010 AND 05000249/2024010

Dear David Rhoades:

On July 2, 2024, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Dresden Nuclear Power Station, Units 2 and 3 and 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, Karla K. Stoedter, Chief Engineering 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: 05000237/2024010 and 05000249/2024010

Licensee: Constellation Energy Generation, LLC

Facility: Dresden Nuclear Power Station, Units 2 and 3

Location: Morris, IL

Inspection Dates: June 10, 2024 to July 02, 2024

Inspectors: E. Fernandez, Senior Reactor Inspector I. Hafeez, Senior Reactor Inspector A. Shaikh, Senior Reactor Inspector

Approved By: Karla K. Stoedter, Chief Engineering Branch 1 Division of Operating Reactor Safety

Enclosure

SUMMARY

The U.S. Nuclear Regulatory Commission (NRC) continued monitoring the licensees performance by conducting a NRC 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.

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 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

71111.21N.04 - Age-Related Degradation Age-Related Degradation

The inspectors selected a sample of components and structures to verify that engineering performance and maintenance activities addressed age-related degradation and that problems were appropriately identified, addressed and corrected.

Samples were selected considering risk insights and the potential for degradation.

Specifically, the inspectors selected samples that were risk-significant and either had indications of age-related degradation or were exposed to environments that could cause age-related degradation. The inspectors considered site-specific and industry-wide operating experience to identify samples and included both active and passive sub-components within each component or structure.

For each selected sample below, the inspectors reviewed the licensee's engineering and maintenance activities credited to address age-related degradation to assess whether they were being performed using applicable standards and procedures, evaluated against appropriate acceptance criteria, and that maintenance and condition monitoring was completed at an appropriate interval. The inspectors also assessed whether issues identified during licensee activities were being entered into and addressed by the applicable station processes including the corrective action program, and whether periodic assessments of maintenance effectiveness and operating experience were being completed, including feedback and process adjustments.

(1) Primary Containment Isolation Valves 2-1301-20 and 3-1301-1

(2) Unit 2 and Unit 3 High Pressure Coolant Injection Room Coolers

(3) Unit 2 and Unit 3 Emergency Diesel Generator Air Accumulator Tanks

(4) Unit 2 and Unit 3 Reactor Building Closed Cooling Water Heat Exchangers

(5) Unit 2 and Unit 3 Condensate Storage Tanks

(6) Diesel Fire Pumps

(7) Unit 2 and Unit 3 Instrument Air Dryers

(8) Electromatic Relief Valves

(9) Reactor Manual Control System

(10) Safety Related 480 Vac Breakers

INSPECTION RESULTS

No findings were identified.

EXIT MEETINGS AND DEBRIEFS

The inspectors verified no proprietary information was retained or documented in this report.

• On July 2, 2024, the inspectors presented the NRC inspection results to C. Joseph, Site Vice President and other members of the licensee staff.

DOCUMENTS REVIEWED

Inspection Type Designation Description or Title Revision or

Procedure Date

71111.21N.04 Calculations DRE98-0077 Dresden HPCI Room Thermal Response with Reduced 001

Room Cooler

Corrective Action AR 02645074 U2 HPCI Room Cooler Outboard Fan Vibe Reading in 10/14/2016

Documents Alert Range

AR 02738296 Discolored Cables in Riser 325 11/07/2016

AR 04173707 U2 HPCI Room Cooler Abnormal Noise 10/16/2018

AR 04206210 U2 HPCI Room Cooler Leak Identified 04/08/2019

AR 04213082 U2 HPCI Room Cooler Noise Change 02/22/2019

AR 04356737 Packing Leak on AO 3-1301-17 Main Steam Line Inbd Iso 07/14/2020

Vlv

AR 04474980 3-1301-17 Iso Cond Vent Valve Solenoid Buzzing 01/31/2022

AR 04480839 Packing Leak on 3-1301-17

AR 04559790 Vibration Data Anomaly on the U2HPCI Room Cooler 04/05/2023

AR 04780485 Light Corrosion on 2-1301-20 Valve Bolting 06/13/2024

Corrective Action AR 04780263 NRC ID: Identified Loose Fasteners Behind Bus 2B 06/12/2024

Documents AR 04780269 NRC ID: Identified Loose Fasteners Behind Bus 3B

Resulting from AR 04780581 Perform NDE Inspection of Piping for U3 HPCI Room 06/13/2024

Inspection Cooler

AR 04780780 NRC ID: Identified BCD Device Near Bus 39 06/14/2024

AR 04783603 NRC ID: NRC CONCERN CALC CHANGES/BASIS 06/27/2024

AR 0484352 ARDI NRC ID: NRC Question ERV Solenoid Conductor 07/01/2024

Temperature

Drawings 12E-2410 Schematic Diagram Reactor Manual Control Sheet 2 Rev. L

Miscellaneous CDBI-DRE02- Emergency Diesel Generator & Auxiliaries License 0

066A Renewal

CDBI-DRE02- Emergency Diesel Generators & Auxiliaries License 0

66A Renewal

ER-DR-330-1001 ISI Program Plan Sixth Inspection Interval 3

LRTI-15 AMR Gas and Ventilation Air (M01) 1

MA-AB-725-110 Preventative Maintenance Inspection of GE Types AK-25 Rev. 11

Circuit Breakers

Inspection Type Designation Description or Title Revision or

Procedure Date

MA-AB-725-112 Preventative Maintenance Inspection of GE 480V Types Rev. 13

AK-50/75, AKS-50, & AKR-75/100 Circuit Breakers and

Cubicles

PO# 12382 Certificate of Conformance HPCI Cooling Coil Material 10/18/2018

NDE Reports 05142242 U3 Eddy Current Test HPCI CLR Coil 05/05/2023

05145356 U2 Eddy Current Test HPCI RM CLR Coil 05/08/2023

ER-AA-335-004 UT Thickness U2 Air Dryers 10

ER-AA-336-004 UT Thickness Sheet U3 Air Dryers 9

Procedures 04949809 Pressure Gauge Out of Tolerance During Power Labs Rev. 1

Calibration

MA-DR-EM-4- Dresser Electromatic Solenoid Actuator Rebuild Rev. 13

200 Instructions

Work Orders 00986900-01 Inspect/Replace HPCI Room Cooler Fan Bearings 03/18/2013

01490829 Replace HPCI Room Cooler Coiling Coil U2 01/09/2019

01804350 Unit 2/3 Internal UT Inspection of CST-B Tank Bottom 10/23/2023

01805284 Unit 2/3 Internal UT Inspection of CST-A Tank Bottom 09/24/2023

04589133 2A RBCCW HX Inspection and Eddy Current Testing 01/03/2022

04599405 3A RBCCW HX Inspection and Eddy Current Testing 02/05/2019

04601529 3B RBCCW HX Inspection and Eddy Current Testing 01/27/2020

04749723 2B RBCCW HX Inspection and Eddy Current Testing 01/02/2023

04949809 PRESSURE GAUGE OUT OF TOLERANCE DURING 10/31/2020

POWER LABS CALBRATION

05145356-01 Eddy Current HPCI Room Cooler 03/09/2023

05194571 Unit 2/3 Diesel Fire Pump Flow Capacity Test 03/23/2023

275017 Unit 1 Diesel Fire Pump Flow Capacity Test 01/31/2024

05397632-01 Eddy Current HPCI Room Cooler Coils 03/03/2023

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