05000260/LER-1980-013-03, /03L-0:on 800301,during Preparations for Startup After Outage for Maint,Offsite 161-kV Power Source Intermittently Lost Power.Caused by Winter Storm.Icing & Wind Effects Under Investigation

/03L-0:on 800301,during Preparations for Startup After Outage for Maint,Offsite 161-kV Power Source Intermittently Lost Power.Caused by Winter Storm.Icing & Wind Effects Under Investigation

ML18024B445
Person / Time
Site:	Browns Ferry
Issue date:	03/28/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18024B444	List: 05000260/LER-1980-013, Forwards LER 80-013/03L-0 05000260/LER-1980-013-03, /03L-0:on 800301,during Preparations for Startup After Outage for Maint,Offsite 161-kV Power Source Intermittently Lost Power.Caused by Winter Storm.Icing & Wind Effects Under Investigation
References
LER-80-013-03L-01, LER-80-13-3L-1, NUDOCS 8004010466
Download: ML18024B445 (4)

LER-1980-013, /03L-0:on 800301,during Preparations for Startup After Outage for Maint,Offsite 161-kV Power Source Intermittently Lost Power.Caused by Winter Storm.Icing & Wind Effects Under Investigation

Event date:
Report date:
2601980013R03 - NRC Website

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69 EVENT DATE 14 75 AEPOAT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES OIO During normal preparations for startup after an outage for maintenance, a winter

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storm with high winds and freezing rain caused t'e Trinity offsite 161-kV power sou~rce to be intermittently lost (T.S. 3.9.A.3).

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.Redundant systems:

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Ice loading and high winds caused intermittent fault conditions requiring operation ~

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8 backfeed mode, Unit 3 station'service energized, Athens offsite 161-kV power source.

~DB of line protective relaying.

Shutdown loads were supplied from the Unit l 500-kV backfeed and the startup was delayed until a second offsite power source was restored.

An investigation of icing and wind effects on the Trinity line is being conducted

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LER SUPPLEMENTAL INFORMATION Form BF-17 BF 15. Z I/)0/79 BFRO 260 /

g01 Technical Specification Involved Reported Under Technical Specification Date of Occurrence

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Time of Occurrence Unit-Identification and Descri tion'of Occurrence A winter storm with high wind~ and freezing rain delayed the startup o

t a ter a s utdown for maintenance due to the intermittent loss of the Trinity offsite 161-kV power source..

Ice lo'ading and high winds resulted in a "galloping" phenomena whereby the phases were either touching or becoming close enough to flash over.

This caused a fault condition requiring operation of line protective relaying.

Conditions Prior to Occurrence:

Unit 1 8 0, re ural ng outage.

Unit 2 8 0, Cold shutdown for maintenance Unit 3 8 100%, normal operation.

Action specified in the Technical Specification Surveillance Requirements met due to ino erablc e ui ment.

Describe.

The un t s a not Ke s ar e up w ou h~h~1RI ?tl=kV M1 four diesels.

A arent Cause of Occurrence Ice loading and high winds caus'ed intermittent fault conditions requiring operation of line protective relaying.

Anal sis of Occurrence:

There was no hazard to the public health or safety, no damage to plant or equipment and no release of activity.

Corr ective Action:

fifieeatar up w~as elaped four hours untdl dependable odfsdte 161-kv power'was restored Shutdown loads were supplied from the unit one 500-kV backfeed.

An investigation of icing and wind effects on the Tdinity line is being conducted by TVA.

Failure Data:

NA

• Reten tion:

• I(evision:

eriod - Lifetime; Responsibility

- Administrative Supervisor