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
Preceding documents:	ML23352A234 (18 December 2023)
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

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

Enclosure

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 Type Designation Description or Title Revision or

Procedure Date

71111.21N.04 Corrective Action Notification 51149178, 51149641, 51072046, 51230817, 51230616,

Documents 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 Notification 51242628, 51242720, 51242726, 51242789, 51242838,

Documents 51242849, 51242861, 51242863, 51242864, 51242865,

Resulting from 51242866, 51242867, 51242868, 51242910, 51242911,

Inspection 51242912, 51242944, 51242945, 51242982, 51242986,

242987, 51242988, 51242989, 51243000, 51243001,

243002, 51243003, 51243780, 51244105, 51244107,

244158, 51244185, 51244255, 51244342, 51244471,

244474, 51244475, 51244515

Drawings 102017, Sheet Saltwater System 97

3B

2032, Sheet Flow Instrument Systems 142

2E

19407, Sheet 1 Electrical Logic Diagram Containment Fan Coolers 16

455125, Sheet 1 Electrical Schematic Diagram, Ventilation Fan Motors 8

501771, Sheet 1 Electrical Diagram of Connections Above Elevation 140' - 14

0" Area F

59346, Sheet 1 Mechanical Ventilation Plan, Area "H", Elevation 100' - 0 37

59641, Sheet 1 Architectural Miscellaneous Exterior Details 11

663336-20 Instructions for Type W Control Centers 6

Miscellaneous 6000367-23 Installation, Operation, and Maintenance Manual for 6

Backdraft Dampers and Motor Operated Shutoff Dampers

663022-27-1-5 Envirex Frame Service Manual 5

Inspection Type Designation Description or Title Revision or

Procedure Date

663022-95-1-5 Traveling Water Screen Operation and Maintenance 5

Manual

663050-32 Instructions for Installation and Maintenance of Steam 11

Lead Safety Valves, Type 3700 - Units 1 & 2

663071-335-1-2 PG&E Diablo Canyon Fiberglass Internal Floating Roof 2

Installation Procedure

663146-85-2 Magnetrol Displacer Type Switches Installation and 2

Operating Manual

663173, Sheet Bettis Service Instructions for Seismic Actuators 8

164

663278-701 Dwyer Series 1630 Differential Pressure Switches 5

DC 6000364, INSTALLATION AND MAINTENANCE MANUAL FOR 4

Sheet 26 FANS S-43, 44, 45, 46

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

DC 663079, WESTINGHOUSE ELEC. CORP. - REACTOR 34

Sheet 51 CONTAINMENT FAN COOLER

DC 663079, Instructions For Type CSP Horizontal Induction Motor For 01/06/1994

Sheet 91 TEWAC Enclosure

DC-663173, Fisher Controls Company Type 7600 Butterfly Control 12

Sheet 120 Valve Body

Procedures AWP E-016 Inspection Guide - Maintenance Rule Structural Monitoring 12

Programs - Civil

ER1.DC1 Component Classification 6

ER1.ID1 Equipment Reliability Process 16

MA1.ID27 Preventative Maintenance Program 12

MA1.NE1 Maintenance Rule Monitoring Program - Civil 7

Implementation

MP 10881 Traveling Screen Bi-Monthly Lube/Inspect 1

MP 10882 TS 1-7: (Diver) Screen Inspections 3

MP 10970 TS1 Thru TS7: Oil Samples (Unit-1) 2

MP 11679 Clean/Insp/Megger/Test Motor 2

MP 12652 Screen Drive Chain Lube 3

MP 31892 TS1-7: Perform Outage Inspect and Lubrication 3

MP 53206 Travel Screen Float Inspect/Adjust 3

Inspection Type Designation Description or Title Revision or

Procedure Date

MP 56397 Traveling Screen Proximity Switch 3

MP E-101A Infrared Thermography Inspections 9

MP E-23.1B Containment Fan Cooler Motor Shop Overhaul 7

MP E-23.1C Containment Fan Cooler Motor Preventive Maintenance 5

MP E-53.7 Maintenance of ITT, General Controls Hydramotor 14

Actuator

MP E-53.7S Model NH92 ITT Controls Hydramotor Valve Actuator 2

Swapout

MP E-57.10B Generic 115 VAC and 480 VAC Motor Preventive 25

Maintenance

MP E-57.10C Generic 4kV Motor Preventive Maintenance 9

MP E-57.14A PI and Hipot Testing 32

MP E-57.2B Equipment Wiring and Terminations 53

MP E-64.1B Molded Case Circuit Breaker Exercise and Maintenance 20A

MP E-67.6 Station Battery Preventive Maintenance 16

MP I-21-LCV88 D/G Fuel Oil Day Tanks Level Control Calibration 6

MP I-23-F5040 Aux Bldg Swgr Room Supply Fan S-44 Disch Flow Switch 1

FS-5040 Calibration

MP M-23-FAN.10 480V Switchgear Ventilation System Maintenance 0

MP M-4.10A Steam Generator Safety Valve Removal and Installation 10

PEP 23-05 480V AC Switchgear and 125V DC Inverter Rooms 4

Ventilation System Flow Balancing

PEP M-81J Test DFO Day Tank Level Instruments 3

STP M-11A Station Battery and Pilot Cell Condition Monitoring 30

STP M-11B Station Battery Condition Monitoring 38

STP M-11C Terminal Resistance Measurement and Inspection for Vital 19

Station Batteries Effective

STP M-77 Safety and Relief valve Testing 42

STP M-81G Diesel Engine Generator Inspection (Electrical Every 31

Refueling Cycle)

STP M-9A2 Diesel Generator 2-2 Routine Surveillance Test 16

Work Orders Work Order (WO) 68036389, 64277075, 64249099, 64274676, 64189346,

64129515, 64211185, 64048769, 64139157, 64206634,

Inspection Type Designation Description or Title Revision or

Procedure 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

7