05000317/LER-1980-043-03, Malfunction of Disconnect Device 89-22B Occurred During Maint.Caused by Failure of Horseshoe Clip Retaining Pin That Connects Sections of Linkage.Clip Replaced

Malfunction of Disconnect Device 89-22B Occurred During Maint.Caused by Failure of Horseshoe Clip Retaining Pin That Connects Sections of Linkage.Clip Replaced

ML19341C986
Person / Time
Site:	Calvert Cliffs
Issue date:	02/23/1981
From:	Wenderlich R BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19341C984	List: 05000317/LER-1980-043, Forwards Updated LER 80-043/03X-1 05000317/LER-1980-043-03, Malfunction of Disconnect Device 89-22B Occurred During Maint.Caused by Failure of Horseshoe Clip Retaining Pin That Connects Sections of Linkage.Clip Replaced
References
LER-80-043-03X, LER-80-43-3X, NUDOCS 8103040657
Download: ML19341C986 (2)

LER-1980-043, Malfunction of Disconnect Device 89-22B Occurred During Maint.Caused by Failure of Horseshoe Clip Retaining Pin That Connects Sections of Linkage.Clip Replaced

Event date:
Report date:
3171980043R03 - NRC Website

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60 61 COCK ET NUMB E R 68 63 EVENT D ATE 74 75 REPORT QATE So EVENT DESCRIPTION AND pro 8 ABLE CCNSEoVENCES h F5121 l Durino normal full cower coeration while conductino routine maintenance I

io i3i l on 500 KV BRKR No. 552-22, a malfunction of disconnect device No.89-22B l

i c i.i l I occurred.

Repair recuired that the 500 KV Black Bus be deenercized.

I to is t i This left only one of the two offsite cower sources ooerable cursuant to 1

10 is i l T.S. 3. 8.1.1.

The three emercency diesel cenerators and the redundant I

lo 6 7l 1 offsite cower source were coerable. The disconnect device was recaired I

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and the bus reenercized. This is not a recetitive occurrence.

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40 41 42 43 44 47 CAUSE DESCRIPTION AND CCRRECTIVE ACTIONS iitoil The malfunction of the disconnect device was due to failure of a horse-l i,iijl shoe clio retaining a ofn that connects sections of linkace used to I

i,,,,i operate the disconnects. The clip was rcolaced and the disconnect de-t i,,,il vice was checked satisfactorily. The clio failure is considered to be I

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LER NO.

80-43/3X DOCKET No.

50-317 LICENSE NO.

DPR-53 EVENT DATE 03-19-30 REPORT DATE 02-23-81 ATTACHMENT EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (CONT'D)

During normal full power operation of Units 1 and 2, while conducting routine maintenance on 500 KV BRKR No. 552-22, a malfunction of disconnect device No.39-22B occurred. Repair of this device required that the 500 KV Black Bus be deenergized. This left only one of the two offsite power sources operable pursuant to T.S. 3.3.1.1. The disconnect device was repaired and the Black Bus was reenergized at 1815 on 3-19-80. Since the other offsite power source as well as the three emergency diesel generators were operable, this event had no impact upon public health or safety. This is not a repetitive occurrence.

CAIISE DESCRIPTION AND CORRECTIVE ACTIONS (CONT'D)

The malfunction of the disconnect device was due to a failure of a horseshoe clip retaining a pin that connects sections of linkage used to operate the disconnects. The clip was replaced and the disconnect device was checked satisfactorily. The clip failure is considered to be an isolated occurrence. However, all similar clips have been inspected during a recent overhaul of each breaker.