05000296/LER-1982-046-03, /03L-0:on 820928,while Performing SI 4.9.A.4.b on Diesel Generator 3D,mechanical Remote Speed Control Governor Failed to Function Properly.Caused by Governor Friction Drive Plates Slipping Excessively.New Governor Installed

/03L-0:on 820928,while Performing SI 4.9.A.4.b on Diesel Generator 3D,mechanical Remote Speed Control Governor Failed to Function Properly.Caused by Governor Friction Drive Plates Slipping Excessively.New Governor Installed

ML20027D398
Person / Time
Site:	Browns Ferry
Issue date:	10/27/1982
From:	Porter M TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20027D393	List: 05000296/LER-1982-046, Forwards LER 82-046/03L-0 05000296/LER-1982-046-03, /03L-0:on 820928,while Performing SI 4.9.A.4.b on Diesel Generator 3D,mechanical Remote Speed Control Governor Failed to Function Properly.Caused by Governor Friction Drive Plates Slipping Excessively.New Governor Installed
References
LER-82-046-03L-02, LER-82-46-3L-2, NUDOCS 8211040244
Download: ML20027D398 (2)

LER-1982-046, /03L-0:on 820928,while Performing SI 4.9.A.4.b on Diesel Generator 3D,mechanical Remote Speed Control Governor Failed to Function Properly.Caused by Governor Friction Drive Plates Slipping Excessively.New Governor Installed

Event date:
Report date:
2961982046R03 - NRC Website

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' EVENT DESCRIPTIOfJ AND PROD ADLE CONSCOUENCES

] l During normal operation, while performing SI 4.9. A.4.b on diesel Renerator 3D.

g] the mechanical remote speed control governor failed to function properiv.

Diesel B l generator 3D was shut down and declared inoperable in accordance with T.S. 3.9.B.2.

j j Redundant systems were available and. operable. There was no effect on public "g ] health and safety.

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Woodward, Type EGB-10C, Governor SN 1165312. A nr.w governor was t

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Tennessee Valley Authority:

Form BF 17 l

Browns Ferry Nuclear Plant BF 15.2 2/112/82 LER SUPPLEMENTAL INFORMATION i '

BFRO 296 /

82046 Technical Specification Involved 3.9.B.2 Reported Under Technical Specification 6.7.2.b.(2) Date Due NRC 10/28/82

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Event Narrative:

Unit 1 was operating at 89-percent power; unit 2 was shut down for refueling outage. Unit 3 was operating a.t 98-percent power and was the only unit affected by this event.

I DuringtheperformanceofSI4.9.I.4.b,theremotespeedcontrolofthe3Ddiesel generator governor failed to increase to the maximum setting, making it difficult to synchronize frequencies or to change load distributing after synchronizing.

Due to the inability of setting the speed control remotely, the diesel generator was shut down and was declared inoperable in which the surveillcnce requirements of T.S. 3.9.B.2 were initiated and successfully completed. The governor was replaced and the diesel generator was retested and performed satisfactorily. The L

cause of the governor failure was determined to be excessive slippage between the friction drive plate and the speed adjusting screw. This was either due to nonnal operation or to an intennittently operable limit switch which allowed the -

speed adjusting motior to run excessively. An attempt to solve the problem by tightening the Kaylock nut (ailed due to the speed se,tting limit switch r.ot shutting off the motor and causing the switch actuator ann assembly to break.

l The governor, manufactured by Woodward is a type EGB-10C, serial no. 1165312.

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'Ihe event was an isolated incident requiring no recurrrence control. There was no etfect on public health and safety. Redundant systems were available and operable.

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L BFRO-50-296/80036 L.

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