05000296/LER-1981-033-03, /03L-0:on 810706,,diesel Generator Redundant Start Relay Time Delay SFD1 Exceeded 4.4-S Test Time.Caused by Pneumatic Time Delay Relay Drifting Out of Tolerance.Relay Timed,Tested & Returned to Svc

/03L-0:on 810706,,diesel Generator Redundant Start Relay Time Delay SFD1 Exceeded 4.4-S Test Time.Caused by Pneumatic Time Delay Relay Drifting Out of Tolerance.Relay Timed,Tested & Returned to Svc

ML20010A018
Person / Time
Site:	Browns Ferry
Issue date:	07/30/1981
From:	Holder G TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010A009	List: 05000296/LER-1981-033, Forwards LER 81-033/03L-0 05000296/LER-1981-033-03, /03L-0:on 810706,,diesel Generator Redundant Start Relay Time Delay SFD1 Exceeded 4.4-S Test Time.Caused by Pneumatic Time Delay Relay Drifting Out of Tolerance.Relay Timed,Tested & Returned to Svc
References
LER-81-033-03L-02, LER-81-33-3L-2, NUDOCS 8108100391
Download: ML20010A018 (2)

LER-1981-033, /03L-0:on 810706,,diesel Generator Redundant Start Relay Time Delay SFD1 Exceeded 4.4-S Test Time.Caused by Pneumatic Time Delay Relay Drifting Out of Tolerance.Relay Timed,Tested & Returned to Svc

Event date:
Report date:
2961981033R03 - NRC Website

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60 bl DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 tvlN r or.senlPilON AND PROBABLE CONSEQUENCES h [T,7fll During normal operation, while performing diesel generator redundant start test per EMI 3. diesel generator 3C redundant start relay SFD1 time delay exceeded 4.4 g

ggl gg l seconds and the 3C diesel generator was removed from service, however, the diesel l

generator was operable and would have started.

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1(eported (Inder Tc chnical Specification 6.7.2.b.2.

• llate dite N!:C: 8/5/81,

. liate of Occurrence.7/6/81 Time of occurrence 1312 Unit 3

liles.tificat, ion, _ and.lje,cript; ion of 0ccurrencer Wlille performing diesel generator redundant start test, 3C diesel generator redundant start relay SFDL time delay exceeded 4.4 seconds limit of EMI 3.

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tin it 1 in refueling outage.

I Unit 2 at 99%.

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linit 3 at 99%.

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1 Action specified in the Technical Specification Surveillance Requirements met due to inoin rable ettu.ipment. Describe.

Met requirements of T.S.- 4.9.B.2.

. App.irent Cause of Occurrence Setpoint drif ted on redundant start time delay relay SFDl.

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Analysis of Occui rence.

l There' was iio'dahger~to'the health or safety of the public, no releasa of activity, no damage to the plant or equipment, and no resulting si.nificant i

I chain of events.

('. ort ective Action :

The relay was 'tiimed, successfully tested per EMI 3, and the diesel generator l

(3C) returned ';o service. This is considered'a random failure and no further recurrence control is required.

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