05000259/LER-1980-088-03, /03L-0:on 801202,diesel Generator 1c Tie Breaker 1812 on 4-kV Shutdown Board C Tripped.Caused by Faulty Diode in Overspeed Trip Annunciator Relay Circuit Permitting Spurious Signal to Operate Overspeed Trip Relay

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/03L-0:on 801202,diesel Generator 1c Tie Breaker 1812 on 4-kV Shutdown Board C Tripped.Caused by Faulty Diode in Overspeed Trip Annunciator Relay Circuit Permitting Spurious Signal to Operate Overspeed Trip Relay
ML20002C223
Person / Time
Site: Browns Ferry Tennessee Valley Authority icon.png
Issue date: 12/31/1980
From:
TENNESSEE VALLEY AUTHORITY
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20002C224 List:
References
LER-80-088-03L-01, LER-80-88-3L-1, NUDOCS 8101090681
Download: ML20002C223 (2)


LER-1980-088, /03L-0:on 801202,diesel Generator 1c Tie Breaker 1812 on 4-kV Shutdown Board C Tripped.Caused by Faulty Diode in Overspeed Trip Annunciator Relay Circuit Permitting Spurious Signal to Operate Overspeed Trip Relay
Event date:
Report date:
2591980088R03 - NRC Website

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8 60 61 DOCKET NUMSER 64 69 EVENT 04TE 74 75 REPORT OATE PC EVENT DESCRIPTION ANO PROBA8LE CONSEQUENCES h t o 12 l lDuring normal operation while performing SI 4.9.A.1.a. diesel generator 1C tie t o 13 ; l breaker 1812 on 4KV shutdown board C tripped. Reference T.S. 3.9.B.2.

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l targets were found on the protective relays the creaker was reclosed and SI i o 14 l

' ITTT1 I completed. There were no significant resulting events. There wss no danger to l o is I t health or safety of public. No preJicus events.

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JJ 34 3b 38 37 40 el 42 43 44 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i j o l l A faulty diede in rverspeed trip annunciator relay circuit permitted spurious signal g lto operate overspeed trip relay. Diode was replaced and S.I. 4.9.A.la was successftlly, 1

m l performed. International rectifier, diode, Model 10D10. No recurrence control g l required.

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T4nntssee Vall:y Authority Fana BF-17 Browns. Ferry Nuclear Plant BF 15.2 1/10/79 LER SUPPLDENTAL INFORMATION BFFO 259 /

80088 Technical Specification Involved 3.9.B.2 Reported Under Technical Specification 6.7.2.b(2)

Date of Occurrence 12/2/80 Time of Occurrence 2059 Unit 1&2 Identification and Description of Occurrence:

While performing S.I. 4.9.A.l.a diesel generator tie breaker 1812 on 4KV shutdown board C tripped. After no targets were found on the protective relays the breaker was reclosed and SI completed,.

Conditions' Prior to Occurrence:

Unit 1 @ 95%

Unit 2 @ 97%

.pnit 3@ 0% refueling outage Action specified in the Technical Specification Surveillance !1equirements met due to inoperable equipment. Describe.

System returned to service before action to verify operability could E initiated.

Apparent Cause of Occurrence:

The breaker tripped due to a faulty diode in the overspeed trip annunciator relay circuit permitted a spurious ' signal to operate the overspeed trip relay.

l Analysis of Occurrence:

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

l

Corrective Action

The diode was eplaced.

i Failure Data:

NA i

  • Retention :

eriod - Lifetime; Responsibility - Administrative Supervisor

  • Revision: p