05000346/LER-1979-046-03, During Surveillance Testing,Diesel Generator 1-1 Began Making Loud Noises & Was Declared Inoperable.Caused by Bearing Failure in Turbocharger.Turbocharger Replaced

During Surveillance Testing,Diesel Generator 1-1 Began Making Loud Noises & Was Declared Inoperable.Caused by Bearing Failure in Turbocharger.Turbocharger Replaced

ML19344D289
Person / Time
Site:	Davis Besse
Issue date:	04/25/1979
From:	Hartigan J TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19344D287	List: 05000346/LER-1979-046, Forwards Revised LER 79-046/03L-1 05000346/LER-1979-046-03, During Surveillance Testing,Diesel Generator 1-1 Began Making Loud Noises & Was Declared Inoperable.Caused by Bearing Failure in Turbocharger.Turbocharger Replaced
References
LER-79-046-03L, LER-79-46-3L, NUDOCS 8003110637
Download: ML19344D289 (3)

LER-1979-046, During Surveillance Testing,Diesel Generator 1-1 Began Making Loud Noises & Was Declared Inoperable.Caused by Bearing Failure in Turbocharger.Turbocharger Replaced

Event date:
Report date:
3461979046R03 - NRC Website

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14. S. NUCLE AR REGULATORY COMMISSION NRC FORM 3C6 [7 77)

LICENSEE EVENT REPORT CONTROL BLOCK: l l

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8 60 61 DOCK ET NUMBER 6d 69 EVENT DATE 74 75 REPORT DATE 80 EVENT OESCRIPTION AND PROBABLE CONSEQUENCES h O 12 I l At 1030 hours0.0119 days <br />0.286 hours <br />0.0017 weeks <br />3.91915e-4 months <br /> on March 30, 1979 during surveillance testing, Diesel Generator 1-1 be-J gan making loud unusual noises and was thereby decla ed inoperable. This placed the l O la1 l

, o ;4 l l unit in the Action Statement of Technical Specification 3.8.1.1.

Surveillance requir4-ments were fulfilled by proving the operability of the independent of fsite AC l

o Isl l t o l6 ] l electrical power Sources and by demonstrating the operability of the remaining l

ol7ll Diesel Generator 1-2.

There was no danger to the health and safety of the public or l 3 ois ; ; unit personnel. The above surveillance requirements were performed successfully.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS gigoll Diesel Generator 1-1 was declared inoperabl.e due to a bearing failure in the turbo-l g,g,l l charger. The entire turbocharger was replaced, and Diesel Generator 1-1 was declared l g,,,,l operable at 1315 hours0.0152 days <br />0.365 hours <br />0.00217 weeks <br />5.003575e-4 months <br /> on April 1. 1979. Power Encineerina is to evaluate Pouer 1

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,,l3; l Systems' recommendations on improving turbocharger reliability.

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John P. Hartinan PHONE:

~DVR 79-059 NAVE OF PREPARER

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TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-79-49 DATE OF EVENT: March 30, 1979 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Emergency Diesel Generator 1-1 declared inoperable due to turbocharger failure The unit was in Mode 1, with Power (MWT) = 2023, Conditions Prior to Occurrence:

and Load (Gross MWE) = 665.

Description of Occurrence: At 1030 hours0.0119 days <br />0.286 hours <br />0.0017 weeks <br />3.91915e-4 months <br /> on March 30, 1979 during the conduct of ST 5081.01, " Diesel Generator Monthly Surveillance Test", Diesel Geaerator 1-1 started making loud unusual noises. Diesel Generator 1-1 was declared inoperable, Tech-

. placing the unit in the Action Statement of Technical Specificatica 3.8.1.1.

nical Specification 3.8.1.1 requires both independent diesel generators be opera-ble while the unit is in Modes 1, 2, 3, and 4.

The Action Statement requires veri-fication of the remaining AC sources by performance of Surveillance Requirements 4.8.1.1.la and 4.8.1.1.2.a.4.

Surveillance Requirement 4.8.1.1.1.a, which deter-mines the operability of the independent circuits between the offsite transmission network and the onsite Class.lE distribution system at least once in seven days, was fulfilled by ST 5080.01, " Independent Of f-Site AC Sources Lined Up and Availa-ble".

Surveillance Requirement 4.8.1.1.2.a.4, which demonstrates the operability of the remaining Diesel Generator 1-2 with a start from ambient condition and

. acceleration to at least 900 RPM in fE10 seconds, was fulfilled by ST 5081.01,

" Diesel Generator Monthly Test".

Both requirements were successfully completed within one hour of the failure.

Designation of Apparent Cause of Occurrence: The turbocharger malfunction resulted from a turbocharger thrust bearing failure as reported by the vendor, Power Systems.

Analysis of Occurrence: There was no danger to the health and safety of the public or to unit personnel. Diesel Generator 1-2 proved operable and station personnel performed the necessary surveillance requirements as detailed by the Action State-ment of Technical Specification 3.8.1.1.

' Corrective Action: Under Maintenance Work Order 79-1788, the turbocharger unit was

. removed and replaced with a spare. Diesel Generator 1-1 was verified operable by the successful performance of ST 5081.01, " Diesel Generator Monthly Test", at

.1315 hours0.0152 days <br />0.365 hours <br />0.00217 weeks <br />5.003575e-4 months <br /> on April 1, 1979. Power Engineering is to evaluate Power Systens' J

1 recommendations on improving turbocharger reliability.

LER #79-046 u_

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e f TOEDO EDISON : COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL'INFORMATION FOR LER NP-33-79-49 PAGE 2 Failure Data: One previous turbocharger failure -occurred on February 8,1978_ -

see Licensee Event Report NP-33-78-21.

LER #79-046 1

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