Text

Fire Protection Team Inspection Report 05000237/2025011 and 05000249/2025011
	ML25136A348
Person / Time
Site:	Dresden
Issue date:	05/19/2025
From:	Jasmine Gilliam; NRC/RGN-III/DORS/EB2
To:	Rhoades D; Constellation Energy Generation
References
	IR 2025011
	Download: ML25136A348 (1)
	v • d • e

SUBJECT:

DRESDEN NUCLEAR POWER STATION, UNITS 2 AND 3 - FIRE PROTECTION TEAM INSPECTION REPORT 05000237/2025011 AND 05000249/2025011

Dear David P. Rhoades:

On May 1, 2025, 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 Carolyne Joseph 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, Jasmine A. Gilliam, Chief Engineering Branch 2 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:

05000237/2025011 and 05000249/2025011

Enterprise Identifier:

I-2025-011-0030

Licensee:

Constellation Energy Generation, LLC

Facility:

Dresden Nuclear Power Station, Units 2 and 3

Location:

Morris, IL

Inspection Dates:

April 14, 2025 to May 01, 2025

Inspectors:

K. Fay, Senior Reactor Inspector

B. Jose, Senior Reactor Inspector

C. Padilla, Reactor Inspector

Approved By:

Jasmine A. Gilliam, Chief

Engineering Branch 2

Division of Operating Reactor Safety

SUMMARY

The U.S. Nuclear Regulatory Commission (NRC) continued monitoring the licensees performance by conducting a fire protection team 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.05 - Fire Protection Team Inspection (FPTI) Structures, Systems, and Components (SSCs) Credited for Fire Prevention, Detection, Suppression, or Post-Fire Safe Shutdown Review (IP Section 03.01)

Main article: IP 71111.21

The inspectors verified that components and/or systems will function as required to support the credited functions stated for each sample. Additional inspection considerations are located in the fire hazards analysis (FHA) or safe shutdown analysis (SSA).

(1) Fire Zone 1.1.2.4; Unit 2, Reactor Building General Area, Elevation 570'

(2) Unit 3, 125 Vdc Distribution System

(3) Unit 3, 4160 Vac Switch Gear Room

(4) Unit 1, Diesel Driven Fire Pump

(5) Unit 3, Low Pressure Coolant Injection System

Fire Protection Program Administrative Controls (IP Section 03.02) (2 Samples)

The inspectors verified that the selected control or process is implemented in accordance with the licensees current licensing basis. If applicable, ensure that the licensees FPP contains adequate procedures to implement the selected administrative control. Verify that the selected administrative control meets the requirements of all committed industry standards.

(1) Hot Work Permits

(2) Fire System Impairments

Fire Protection Program Changes/Modifications (IP Section 03.03) (2 Samples)

The inspectors verified the following:

a. Changes to the approved FPP do not constitute an adverse effect on the ability to safely shutdown.

b. The adequacy of the design modification, if applicable.

c.

Assumptions and performance capability stated in the SSA have not been degraded through changes or modifications.

d. The FPP documents, such as the Updated Final Safety Analysis Report, fire protection report, FHA, and SSA were updated consistent with the FPP or design change.

e. Post-fire SSD operating procedures, such as abnormal operating procedures, affected by the modification were updated.

(1) Engineering Change (EC) 637078; Technical Evaluation to Revise Specification K-4080 for Fire Protection Pipe Repair Method

(2) Engineering Change (EC) 631956; Technical Evaluation to Justify Adequate Fire Suppression Coverage with Failed Sprinkler Heads in the Unit 3 Hotwell and Low Pressure and High Pressure Heater Bay Areas

INSPECTION RESULTS

No findings were identified.

EXIT MEETINGS AND DEBRIEFS

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

On May 1, 2025, the inspectors presented the fire protection team inspection results to Carolyne Joseph and other members of the licensee staff.

DOCUMENTS REVIEWED

Inspection

Procedure

Type

Designation

Description or Title

Revision or

Date

DRE97-0256

Dresden Station Fire Protection System Design Basis

Hydraulic Calculations

Calculations

DRE98-0023

Diesel Fire Pump (DFP) Test Acceptance Criteria

0535326

Unexpected Station Black Out (SBO) Battery Room

Exhaust Fan Alarm

09/24/2006

3974158

2017 NRC Fire Protection Inspection, Inaccurate Pre-Fire

Plan, Unit 3 Hydrogen Storage Area

2/14/2017

4447383

Auto Start of Units 1 & 2/3 Diesel Fire Pumps (DFP)

10/19/2021

4459015

Unit1 (U1) Diesel Fire Pump Engine Oil Pressure High

11/06/2021

4474022

U1 DFP High Oil Pressure Troubleshooting Results

01/26/2022

4474035

U1 DFP Fuel Pump Leak

01/26/2022

4489534

Hotwork Fire Protection Non-Compliance

04/01/2022

4500854

U1 DFP Capacity Check Low Margin Results

05/19/2022

4507619

U1 Diesel Fire Pump Auto Start

06/26/2022

4509366

Diesel Fire Pump Low Pressure Switch Calibration Failed

07/05/2022

4519440

Work Request Needed for U1 DFP Electric Governor

Replacement

08/29/2022

21043

Fire Marshal (FM) Evaluate Transient Combustibles

Permit 1398

09/07/2022

27433

Procedure Revision(s) Needed to Manually Start a Fire

Pump

10/06/2022

4677733

U1 DFP Performance Follow-Up

05/12/2023

4699985

Potential Operator Work-Around

09/01/2023

4701206

Cribhouse XL3 51-22 Protection Wire

09/08/2023

4704642

U1 Diesel Fire Pump Low Level Switch Improperly Set

09/24/2023

4716701

Day Impairment Required per Technical Requirements

Manual (TRM) 3.7.j and 3.3.e for XL3 Zone 51 Inoperable

11/10/2023

4739790

U1 DFP Low Header Pressure Start Higher than Expected

01/31/2024

4742582

Fire Header Leak in U3 Reactor Building, Torus

Catwalk/Basement Bay 13

2/04/2024

71111.21N.05

Corrective Action

Documents

4760667

U1 Diesel Fire Pump High Oil Pressure

03/24/2024

Inspection

Procedure

Type

Designation

Description or Title

Revision or

Date

4772037

XL3 51-22, 2/3 Cribhouse Basement Cable Tray Heat

Detector in Alarm.

05/04/2024

4776375

Multiple 2/3 Cribhouse Cable Tray Sprinkler Heads

Clogged

06/23/2024

4778675

Trend Issue Report (IR): DFPS 4134-09 Clogged Nozzles

06/04/2024

4779097

IR 4688423 Work Request (WR) 1543805 Not Executed

06/06/2024

4779433

Unexpected Alarm: 901-2 F-8 U1 Fire Pump Day Tank

Level Low

06/07/2024

4779477

U1 DFP Day Tank Level Indicator Stuck

06/08/2024

4779528

U1 DFP Day Tank Local Indicator Does Not Work

06/08/2024

4784952

U1 Battery Terminal Lead Connection damaged

07/04/2024

4785126

U2/3 Cribhouse Cable Tray Deluge Sys. Extent of

Condition

07/05/2024

4787364

U1 DFP Wet Pipe Sprinkler Technical Requirements

Manual (TRM) Required Action 3.7.j.A.5.2

07/16/2024

4810266

Throughwall Leak on Fire Protection Pipe on Unit 2 Torus

Catwalk

10/18/2024

4816525

Day IR per TRM 3.7.j for U3 Bus Duct Deluge System

Isolated

11/10/2024

24753

NRC Identified Issue

2/18/2024

4857890

NRC Identified: Power Cable Routed Through Doorway

04/17/2025

4857948

NRC Identified: Blue Tape on Piping in U3 West Corner

Room

04/17/2025

4858029

NRC Identified: Degraded Insulation

04/17/2025

4858310

NRC Identified: Procedure Revision for DFPS 4123-07

04/18/2025

4858338

NRC ID-Cable Not Removed during D3R24 MR90

Removal

04/18/2025

Corrective Action

Documents

Resulting from

Inspection

4859059

NRC Identified: Typo on Fire System Impairment

04/21/2025

2E-6580B

Schematic Diagram Preaction System Deluge & Detectors

Control Panels 2202-56A, 2202-56B

F

F-18-3

Hot Shutdown HPCI/LPCI Method Cribhouse

A

F-18-5

Cold Shutdown Division II LPCI Cribhouse

A

Drawings

F-432

Fire Suppression System Cribhouse Basement Cable Tray

Area Isometric

A

Inspection

Procedure

Type

Designation

Description or Title

Revision or

Date

F-5-1

Detection and Suppression, Reactor Building Elevation

570'

Engineering

Changes

EC 406238

Automatic Sprinkler Deluge Valve Reliable Model DDX 6

Inch Valve

ATI 935492-02

U1 DFP Surveillance Clarifications

09/18/2009

EC 631956

Generic Letter 86-10 Evaluation to Justify Adequate Fire

Suppression Coverage with Failed Sprinkler Heads in the

U3 Hotwell and Low Pressure and High Pressure Heater

Bay Areas

Engineering

Evaluations

EC 637078

Generic Letter 86-10 Evaluation to Revise Specification

K-4080 for Fire Protection Pipe Repair Method

Fire Plans

2 U1CH

Fire Zone 11.3 - Unit 1 Cribhouse Pre-Fire Plan

1-4101-DFPLO

U1 Diesel Fire Pump Lube Oil Analysis Results (Feb

21-Feb 2022)

03/08/2022

1-4101-DFPLO

U1 Diesel Fire Pump Lube Oil Analysis Results (May

22-September 2022)

09/23/2022

1-4101-DFPLO

U1 Diesel Fire Pump Lube Oil Analysis Results

(November 2022-September 2023)

09/27/2023

1-4101-DFPLO

U1 Diesel Fire Pump Lube Oil Analysis Results (January

24-July 2024)

07/01/2024

1-4101-DFPLO

U1 Diesel Fire Pump Lube Oil Analysis Results (July

24-March 2025)

03/09/2025

24-098