05000296/LER-1979-023-03, /03L-0:on 791202,diesel Generator 3C Tripped Following Start of RHR Pump 3B.Caused by Excessive Voltage Output of Frequency Generator Due to Component Drift.Voltage Output Corrected & Speed Sensing Panels Calibr

/03L-0:on 791202,diesel Generator 3C Tripped Following Start of RHR Pump 3B.Caused by Excessive Voltage Output of Frequency Generator Due to Component Drift.Voltage Output Corrected & Speed Sensing Panels Calibr

ML18024B200
Person / Time
Site:	Browns Ferry
Issue date:	12/31/1979
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18024B199	List: 05000296/LER-1979-023, Forwards LER 79-023/03L-0 05000296/LER-1979-023-03, /03L-0:on 791202,diesel Generator 3C Tripped Following Start of RHR Pump 3B.Caused by Excessive Voltage Output of Frequency Generator Due to Component Drift.Voltage Output Corrected & Speed Sensing Panels Calibr
References
LER-79-023-03L-02, LER-79-23-3L-2, NUDOCS 8001030709
Download: ML18024B200 (3)

LER-1979-023, /03L-0:on 791202,diesel Generator 3C Tripped Following Start of RHR Pump 3B.Caused by Excessive Voltage Output of Frequency Generator Due to Component Drift.Voltage Output Corrected & Speed Sensing Panels Calibr

Event date:
Report date:
2961979023R03 - NRC Website

text

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~OLJ JO I.ICENSE TYPE 30 57 CAT 58 LiCENSEE EVENT REPORT (PLEASE PRINT OR TYPE ALLREQUIRED INFORMATION) 3 Q20 0 -

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'/4 15 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES QIO During performance of the diesel enerator emer e

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9 Oo REPOIlT DATE 1

80 diesel gen-erator 3C tripped following the start of the RHR pump 3B contrary to T. S. 3.9.A.

There were no significant resulting events.

There was no danger to health or safety of the

~OS public.

No previous occurrences.

Diesel generators 3A, 3B, and 3D were available.

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speed sensing panels were calibrated.

The higher output was due to corn pnent dri,ft All U-3 D/G were checke and U-1 and 2 D/G wi,ll be checked during refueling outage.

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9 FACILITY STATUS

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11 12 13 PERSONNEL INJURIES NUtTIBEII DESCRIPTION 41 3 ~00 0

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11 12 LOSS OF OA DAMACETo FACILITY 43 TYPE DESCIIIPTION 7.

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Tennessee Valley Autlty

"'r'owns Ferry Nuclear Plant LHR SUPPLEPIPNTAL INFOHNATION Form BI'-17 F~F l~r

/10/79 BFRO-50-.

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7923 Technical Specification Involve~i ltcported Under Technical Speci('ication 6.7.2.6.2 Date of Occurrence 12/2/79 Time of Occurrence 11oo Unit Identification and Descr~ition of Occurrence:

Diesel generator 3C tripped following tEe start of RHR pump 3B.

This was during the performance of SI 4.9.A.l.b.

Conditions =Pr ior to Occurrence:

U-1 8 95%.

U-2 8 95%.

U-3 6 0% refueling outage.

Action specified in the Technical Specification Surveill-Ince Ilequirements met Apparent Cause of Occurrence:

The voltage output of frequency generator was too high resulting in the D/G tying in at a lower speed and voltage.

The D/G tried to compensate and tripped on overspeed.

I I

Analvafa of Occurrence:

There was no damage to plant equipment.

There was no activity release, no personnel exposure or injury, and no danger to health or safety of the public.

Corre'ive Action:

The frequency generator voltage output was corrected and the speed sensing panels were. calibrated on D/G 3C.

A1X U-3 D/G were checked, and the U-1 and 2 D/G's-will be checked prior to the performance of the emergency load acceptance test during U-1 refueling outage.

1"ailur Date NA

~lletention:

eriod - Lifetime Re >onsibility - Administrative Supervisor

~Revision:

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