05000259/LER-1980-019-01, /01T-0:on 800301,during Winter Storm,Offsite 161 Kv Power Sources Were Lost for Six Minutes.Caused by High Winds & Ice Loading.Condition Compounded by Improper Lineup of Athens Line Protective Zone Relays

/01T-0:on 800301,during Winter Storm,Offsite 161 Kv Power Sources Were Lost for Six Minutes.Caused by High Winds & Ice Loading.Condition Compounded by Improper Lineup of Athens Line Protective Zone Relays

ML19305A962
Person / Time
Site:	Browns Ferry
Issue date:	03/14/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19305A955	List: 05000259/LER-1980-019, Forwards LER 80-019/01T-0 05000259/LER-1980-019-01, /01T-0:on 800301,during Winter Storm,Offsite 161 Kv Power Sources Were Lost for Six Minutes.Caused by High Winds & Ice Loading.Condition Compounded by Improper Lineup of Athens Line Protective Zone Relays
References
LER-80-019-01T, LER-80-19-1T, NUDOCS 8003180618
Download: ML19305A962 (2)

LER-1980-019, /01T-0:on 800301,during Winter Storm,Offsite 161 Kv Power Sources Were Lost for Six Minutes.Caused by High Winds & Ice Loading.Condition Compounded by Improper Lineup of Athens Line Protective Zone Relays

Event date:
Report date:
2591980019R01 - NRC Website

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EVENT OEScalPTION AND PROB AdLE CONSEOuENC5$ h lo12l l During normal operations (unit l' refueling outane, unit 2: cold shutdow3L.for i

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l o 1., ] I for six minutes (T.S. 3.9.B.1 uni t 3 and T.S. 3.9.C.2 units 1 & 2).

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,,,,,l protective zone relays. Shutdown loads were supplied from unit I until of fsite nownr i

g,was restored. System switching and clearance procedures will be revised to include thel lines.

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NAME 06 PREPAnEH 0 1 D *)

o Tennessee Valley Authority Form DF-17 Browns Ferry Nuchar Plant BF 15.2 1/10/79 LER SUPPLEMENTAL INFORMATION Units.1 & 2 Unit 3 i4 F RO /

fechnical Specification involved Reported Under Technical Specification 6.7.2.A.2 I) ate of Occurren"e 3/1/80 Time cf Occurrence 1036

, Unit 1 h!cntifiention..ml Description hf Occurrence:

1,oss of Athens and Trinity offstte 161-kV power sources from 1036 a.m. to 1042 a.m.

Ice loading and high winds resultad in a " galloping" phenomena whereby the phases were either touching or becoming close enough to flash over. This created a fault condition requiring operation of line protective relaying.

Cen31itions Prior to Occurrence:

Unit 1 @ 0, refueling outage Unit 2 @ 0, cold shutdown for maintenance Unit 3 @ 100%, normal operation Acthn specified in the Technical Specificition Surveillance Requirements met due to inoperableyfu_ipment. Describe.

None. Regulatory Guide 1.93 allows continued operation at full or reduced power for a limited time, if it is safer, than to effect an immediate shutdown on the loss

,of some of the required power sources.

Ann.irent Cause of Occurrence: The Athens 161-kV breaker opened and locked out from pedtective zone relays turvere permitted to operate on a fault condition on the Trinity line because pilot wire carrier blocking of the relay scheme was not in service for the Browns Ferry station. The Athens line remained de-energized until a substation operator arrived and reclosed the line breaker. Carrier blocking pilot signals were g g g i g gegu g og r y s g g g ion switching and clearance procedures did Amlysis of Occurrence:

There was no hazard to the public health or safety.

Corrective Acticn: sh'utdown loads were supplied from unit i until offaite power was restored. Contingency procedures were developed to supply station loads from the 500-kV system. System switching and clearanca procedures will be revised,at the dispatching of fice level to include the carrier pilot relaying signal switches in the return to service of Browns Ferry lines. Man will be stationed at Athens substation during adverse weather conditions.

Failure Data:

None

• Reten tion :

Period - Lifetime; Responsibility - Adniinistrative Supervisor

• R evision :

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