05000259/LER-1980-020-03, /03L-0:on 800301,during Normal Operation,W/High Winds & Freezing Rain,Trinity Offsite 161-kV Power Source Was Lost Intermittently.Caused by Ice Loading & High Winds Requiring Operation of Line Protective Relay

/03L-0:on 800301,during Normal Operation,W/High Winds & Freezing Rain,Trinity Offsite 161-kV Power Source Was Lost Intermittently.Caused by Ice Loading & High Winds Requiring Operation of Line Protective Relay

ML19309A881
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
ML19309A876	List: 05000259/LER-1980-020, Forwards LER 80-020/03L-0 05000259/LER-1980-020-03, /03L-0:on 800301,during Normal Operation,W/High Winds & Freezing Rain,Trinity Offsite 161-kV Power Source Was Lost Intermittently.Caused by Ice Loading & High Winds Requiring Operation of Line Protective Relay
References
LER-80-020-03L, LER-80-20-3L, NUDOCS 8004010458
Download: ML19309A881 (2)

LER-1980-020, /03L-0:on 800301,during Normal Operation,W/High Winds & Freezing Rain,Trinity Offsite 161-kV Power Source Was Lost Intermittently.Caused by Ice Loading & High Winds Requiring Operation of Line Protective Relay

Event date:
Report date:
2591980020R03 - NRC Website

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40 el OOCatTNuustM G4 69 (VINT DAf t to 74 HIPOHT DATE so EVENT DESCRIPTION AND PROsA8LE CONSEQUENCE = O'a o 2 lDuring normal operation (Unit 1: refueling outage, Unit 2: Cold shutdown for 1

I maintenance, Unit 3: normal power operation)during a winter storm with high winds l

o gl and freezing rain; the Trinity offsite 16 7 power source was lost intermittently l

I lfor 32 minutes (T.S. 3.9.B.1 Unit 3 and T.S. 3.9.C.2 Units 1 and 2).

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l o g l l no danger to the public health or safety. Redundant systems: Diesel generators, g

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l l Athens offsite 161-kV power source. No previous occurrences.

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IZ l9191916 33 34 3S 36 JP to 41 47 43 44 47 CAusE DESCRIPTION AND CORRECilvt ACTIONS l Ice loading and high winds caused intermittent fault conditions requiring operation l

i o gof line protective relaying. Shutdown loads were supplied from the Unit 1500-kV l

l backfeed until offsite 161-kV power was restored. An investigation of icing and l

l wind effects on the Trinity line is being conducted by TVA.

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Tennesses Valley Authority Form BF-17 Browns Ferry Nuclear Plant BF 15.2 1/10/79 LER SUPPLEMENTAL INFORMATION

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IJnits 1 & 2:3.9.C.2 BFRO 259 / 8020 Technical Specification Involved I! nit 3: 3.9.B.1 Reported Under Technical Specification 6.7.2.b(2)

Date of Occurrence 3/1/80 Time of Occurrence 1028 Unit 1

Identification and Descriptton of Occurrence: Intermittent loss of the Trinity off-site 161-kV power source from 1028 until 1100 hours0.0127 days <br />0.306 hours <br />0.00182 weeks <br />4.1855e-4 months <br />. Ice loading 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:

1} nit 1 @ 0, refueling outage.

11 nit 2 0 0, cold shutdown for maintenance.

I? nit 3 @ 100%, normal operation.

Action specified in the Technical Specification Surveillance Requirements met due to inoperable equipment. Describe.

None. Regulatory Guide 1.93 allows continued operation at rull or reaucea p'59er for a limited time, if it is safer, than to effect an immediate shutdown on loss of some of the required power sources.

Apparent Cause of Occurrence:

Ice loading and high winds caused internittent fault conditions requiring op'eration of line protective relaying.

Analysis of Occurrence:

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

Corrective Action

Shutdown loads were supplied from the Unit 1500-kV backfeed until offsite 161-kV i

power was restored. An investigstion of icing and wind effects on the Trinity-line is being conducted by TVA.

Failure Data:

NA

• Retention:

eriod - Lifetime; Responsibility - Administrative Supervisor

• Revision :

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