IR 05000275/2024014

Age-Related Degradation Inspection Report 05000275/2024014 and 05000323/2024014

ML24192A224
Person / Time
Site:	Diablo Canyon
Issue date:	07/11/2024
From:	Vincent Gaddy NRC/RGN-IV/DORS/EB1
To:	Gerfen P Pacific Gas & Electric Co
Reinert D
References
IR 2024014
Download: ML24192A224 (9)

Text

July 11, 2024

SUBJECT:

DIABLO CANYON NUCLEAR POWER PLANT - AGE-RELATED DEGRADATION INSPECTION REPORT 05000275/2024014 AND 05000323/2024014

Dear Paula A. Gerfen:

On June 27, 2024, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Diablo Canyon Nuclear Power Plant and 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, Vincent G. Gaddy, Chief Engineering Branch 1 Division of Operating Reactor Safety Docket Nos. 05000275, 05000323 License Nos. DPR-80, DPR-82

Enclosure:

As stated

Inspection Report

Docket Nos.

05000275, 05000323

License Nos.

DPR-80, DPR-82

Report Nos.

05000275/2024014 and 05000323/2024014

Enterprise Identifier:

I-2024-014-0000

Licensee:

Pacific Gas and Electric Company

Facility:

Diablo Canyon Nuclear Power Plant

Location:

Avila Beach, CA

Inspection Dates:

June 10, 2024 to June 27, 2024

Inspectors:

D. Bryen, Reactor Inspector

D. Reinert, Senior Reactor Inspector

F. Thomas, Reactor Inspector

Approved By:

Vincent G. Gaddy, Chief

Engineering Branch 1

Division of Operating Reactor Safety

SUMMARY

The U.S. Nuclear Regulatory Commission (NRC) continued monitoring the licensees performance by conducting an Age-Related Degradation Inspection at Diablo Canyon Nuclear Power 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.

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

(1) Unit 2 Diesel Generator 2-2 Day Tank Level Switches LS-202 and LS-203

(2) Unit 2 Diesel Generator 2-3 Lube Oil Heater Controller

(3) Unit 1 Auxiliary Saltwater Traveling Screen 1-7

(4) Unit 1 Auxiliary Saltwater System Pump 1-1 Motor

(5) Unit 1 Auxiliary Saltwater Pump 1-1 Room Exhaust Fan Motor

(6) Unit 1 Component Cooling Water Heat Exchanger Inlet Isolation Valve 1-FCV-602

(7) Unit 1 480V Switchgear Ventilation System Damper and Flow Switch FCV-5046 and FS-5040

(8) Unit 2 480V Switchgear Ventilation System Exhaust Fan 2-E-46

(9) Unit 2 Vital Battery 2-1

(10) Unit 1 Containment Fan Cooler 1-2 Motor

(11) Unit 2 Residual Heat Removal Pump 2-2 Motor

(12) Unit 1 Condensate Storage Tank Floating Roof

(13) Unit 1 480V Class 1E Control Room Ventilation System Molded Case Circuit Breakers

(14) Unit 1 Containment to Auxiliary Building Annular Weatherproof Boot Seal

(15) Unit 1 Steam Generator Main Steam Safety Valve 1-RV-224

INSPECTION RESULTS

No findings were identified.

EXIT MEETINGS AND DEBRIEFS

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

• On June 27, 2024, the inspectors presented the Age-Related Degradation Inspection results to Paula A. Gerfen and other members of the licensee staff.

DOCUMENTS REVIEWED

Inspection

Procedure

Type

Designation

Description or Title

Revision or

Date

Corrective Action

Documents

Notification

51149178, 51149641, 51072046, 51230817, 51230616,

51146572, 51070582, 51038955, 51099790, 51140700,

51144252, 51154280, 51224176, 51220648, 51225733,

51176279, 51220557, 51221497, 51224029, 51225585,

227392, 51065420, 51141917, 51204021, 51205821,

206011, 51206345, 51212387, 51212414, 50680834,

51033218, 51131797, 51227975, 51229672, 51232621,

232627, 51235532, 51237278, 51232716, 50035683,

50573202, 51033218, 51232627, 51235532, 50980387,

51019290, 51019292, 51205592

Corrective Action

Documents

Resulting from

Inspection

Notification

242628, 51242720, 51242726, 51242789, 51242838,

242849, 51242861, 51242863, 51242864, 51242865,

242866, 51242867, 51242868, 51242910, 51242911,

242912, 51242944, 51242945, 51242982, 51242986,

242987, 51242988, 51242989, 51243000, 51243001,

243002, 51243003, 51243780, 51244105, 51244107,

244158, 51244185, 51244255, 51244342, 51244471,

244474, 51244475, 51244515

2017, Sheet

3B

Saltwater System

2032, Sheet

2E

Flow Instrument Systems

2

19407, Sheet 1

Electrical Logic Diagram Containment Fan Coolers

455125, Sheet 1

Electrical Schematic Diagram, Ventilation Fan Motors

501771, Sheet 1

Electrical Diagram of Connections Above Elevation 140' -

0" Area F

59346, Sheet 1

Mechanical Ventilation Plan, Area "H", Elevation 100' - 0

59641, Sheet 1

Architectural Miscellaneous Exterior Details

Drawings

663336-20

Instructions for Type W Control Centers

6000367-23

Installation, Operation, and Maintenance Manual for

Backdraft Dampers and Motor Operated Shutoff Dampers

71111.21N.04

Miscellaneous

663022-27-1-5

Envirex Frame Service Manual

Inspection

Procedure

Type

Designation

Description or Title

Revision or

Date

663022-95-1-5

Traveling Water Screen Operation and Maintenance

Manual

663050-32

Instructions for Installation and Maintenance of Steam

Lead Safety Valves, Type 3700 - Units 1 & 2

663071-335-1-2

PG&E Diablo Canyon Fiberglass Internal Floating Roof

Installation Procedure

663146-85-2

Magnetrol Displacer Type Switches Installation and

Operating Manual

663173, Sheet

164

Bettis Service Instructions for Seismic Actuators

663278-701

Dwyer Series 1630 Differential Pressure Switches

DC 6000364,

Sheet 26

INSTALLATION AND MAINTENANCE MANUAL FOR

FANS S-43, 44, 45, 46

AND E-43, 44, 45 & 46; UNITS 1 & 2

DC 663079,

Sheet 51

WESTINGHOUSE ELEC. CORP. - REACTOR

CONTAINMENT FAN COOLER

DC 663079,

Sheet 91

Instructions For Type CSP Horizontal Induction Motor For

TEWAC Enclosure

01/06/1994

DC-663173,

Sheet 120

Fisher Controls Company Type 7600 Butterfly Control

Valve Body

AWP E-016

Inspection Guide - Maintenance Rule Structural Monitoring

Programs - Civil

ER1.DC1

Component Classification

ER1.ID1

Equipment Reliability Process

MA1.ID27

Preventative Maintenance Program

MA1.NE1

Maintenance Rule Monitoring Program - Civil

Implementation

MP 10881

Traveling Screen Bi-Monthly Lube/Inspect

MP 10882

TS 1-7: (Diver) Screen Inspections

MP 10970

TS1 Thru TS7: Oil Samples (Unit-1)

MP 11679

Clean/Insp/Megger/Test Motor

MP 12652

Screen Drive Chain Lube

MP 31892

TS1-7: Perform Outage Inspect and Lubrication

Procedures

MP 53206

Travel Screen Float Inspect/Adjust

Inspection

Procedure

Type

Designation

Description or Title

Revision or

Date

MP 56397

Traveling Screen Proximity Switch

MP E-101A

Infrared Thermography Inspections

MP E-23.1B

Containment Fan Cooler Motor Shop Overhaul

MP E-23.1C

Containment Fan Cooler Motor Preventive Maintenance

MP E-53.7

Maintenance of ITT, General Controls Hydramotor

Actuator

MP E-53.7S

Model NH92 ITT Controls Hydramotor Valve Actuator

Swapout

MP E-57.10B

Generic 115 VAC and 480 VAC Motor Preventive

Maintenance

MP E-57.10C

Generic 4kV Motor Preventive Maintenance

MP E-57.14A

PI and Hipot Testing

MP E-57.2B

Equipment Wiring and Terminations

MP E-64.1B

Molded Case Circuit Breaker Exercise and Maintenance

20A

MP E-67.6

Station Battery Preventive Maintenance

MP I-21-LCV88

D/G Fuel Oil Day Tanks Level Control Calibration

MP I-23-F5040

Aux Bldg Swgr Room Supply Fan S-44 Disch Flow Switch

FS-5040 Calibration

MP M-23-FAN.10

480V Switchgear Ventilation System Maintenance

MP M-4.10A

Steam Generator Safety Valve Removal and Installation

PEP 23-05

480V AC Switchgear and 125V DC Inverter Rooms

Ventilation System Flow Balancing

PEP M-81J

Test DFO Day Tank Level Instruments

STP M-11A

Station Battery and Pilot Cell Condition Monitoring

STP M-11B

Station Battery Condition Monitoring

STP M-11C

Terminal Resistance Measurement and Inspection for Vital

Station Batteries Effective

STP M-77

Safety and Relief valve Testing

STP M-81G

Diesel Engine Generator Inspection (Electrical Every

Refueling Cycle)

STP M-9A2

Diesel Generator 2-2 Routine Surveillance Test

Work Orders

Work Order (WO)

68036389, 64277075, 64249099, 64274676, 64189346,

64129515, 64211185, 64048769, 64139157, 64206634,

Inspection

Procedure

Type

Designation

Description or Title

Revision or

Date

213685, 64255134, 60150786, 60150790, 60059552,

60076540, 64129689, 64147702, 64159916, 64132178,

64014715, 64135265, 64138128, 64196006, 64272308,

256011, 64280534, 64265947, 64268932, 64091367,

64124330, 64258747, 64273775, 64270713, 64255056,

64091381