05000327/LER-1980-140-03, /03L-0:on 800809,during Preoperational Test,Diesel Generator 86LOR Relay Coils Burned Out Following Blackout Initiation.Caused by 86LOR Relay Being Reset Before Blackout Relays.Coils Replaced & Relays Reset

/03L-0:on 800809,during Preoperational Test,Diesel Generator 86LOR Relay Coils Burned Out Following Blackout Initiation.Caused by 86LOR Relay Being Reset Before Blackout Relays.Coils Replaced & Relays Reset

ML19338C923
Person / Time
Site:	Sequoyah
Issue date:	08/29/1980
From:	Romine D TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19338C921	List: 05000327/LER-1980-140, Forwards LER 80-140/03L-0 05000327/LER-1980-140-03, /03L-0:on 800809,during Preoperational Test,Diesel Generator 86LOR Relay Coils Burned Out Following Blackout Initiation.Caused by 86LOR Relay Being Reset Before Blackout Relays.Coils Replaced & Relays Reset
References
LER-80-140-03L, LER-80-140-3L, NUDOCS 8009080380
Download: ML19338C923 (2)

LER-1980-140, /03L-0:on 800809,during Preoperational Test,Diesel Generator 86LOR Relay Coils Burned Out Following Blackout Initiation.Caused by 86LOR Relay Being Reset Before Blackout Relays.Coils Replaced & Relays Reset

Event date:
Report date:
3271980140R03 - NRC Website

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< VENT oaf t 74 79 MtPORT DATE 80 EVENT DE'ORtPTION AND PROBABLE CONSEQUENCES h Lo_1.1J l During the performance of preoperational test TVA 13B, the diesel generator 86 LOR l

lo13l l relay coils burned out during a stop attempt, following blackout initiation. In l

[TT'71 l this condition the diesel generators would trip from all normal functions. This is l

l an unreliable situation and therefore the diesel generators were declared inoperable.

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, 2 l their quick response time. The coils we:e replaced and the 86 LOR relays were reset IiIil l in proper sequence and the system declared operable on 8/9/80.

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8 9 to 48 49 Name of Preparer Dean Romine Phone 8009080330

- TEW ESSEE VALLEY AUTHORITY

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Sequoyah Nuclear Plant LER SUPPLEMENTAL INFORMATION SQRO-50-327/80140 Technical Specification Involved 3.8.1.1 Reported Under Technical Specification 6.9.1.12.b Date of Occurrence 8/9/80 Time of Occurrence 1519 CDST U it 1 n

Identification and Description of Occurrence:

The diesel generator 86 LOR relay coils burned out during a stop attempt following blackout initiation during Pre-OP test TVA 13B. In this condition the diesel generators would trip from all normal functions.

This is an unreliable situation and therefore the diesel generators were declared inoperable.

Conditions Prior to Occurrence:

Unit 1 in Mode 2, approx. 3: RTP Apparent Cause of Occurrence:

The 86 LOR relays were reset before the black out relays were reset

Corrective Action

The relay coils were replaced. Future corrective action is being in-vestigated by ths Engineering Design Branch.

Failure Data:

N/A e

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O M

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