05000327/LER-1980-195-01, /01T-0:on 801212,util Notified That Interlocks on Emergency Feeder Breakers to 6.9-kV Shutdown Boards Could Allow Diesel Generators to Connect to Shutdown Boards W/O Operating Load Stripping Relays & Cause Generator Overload

/01T-0:on 801212,util Notified That Interlocks on Emergency Feeder Breakers to 6.9-kV Shutdown Boards Could Allow Diesel Generators to Connect to Shutdown Boards W/O Operating Load Stripping Relays & Cause Generator Overload

ML19340D404
Person / Time
Site:	Sequoyah
Issue date:	12/24/1980
From:	Cottle W, Gelston A TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19340D394	List: 05000327/LER-1980-195, Forwards LER 80-195/01T-0 05000327/LER-1980-195-01, /01T-0:on 801212,util Notified That Interlocks on Emergency Feeder Breakers to 6.9-kV Shutdown Boards Could Allow Diesel Generators to Connect to Shutdown Boards W/O Operating Load Stripping Relays & Cause Generator Overload
References
LER-80-195-01T, LER-80-195-1T, NUDOCS 8012300535
Download: ML19340D404 (1)

LER-1980-195, /01T-0:on 801212,util Notified That Interlocks on Emergency Feeder Breakers to 6.9-kV Shutdown Boards Could Allow Diesel Generators to Connect to Shutdown Boards W/O Operating Load Stripping Relays & Cause Generator Overload

Event date:
Report date:
3271980195R01 - NRC Website

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60 64 00CaLET NUWOEM 65 69 EVENT oATL 34 in REPORT o AT E so EVENT DESCalPTION AND PROSA8LE CONSEQUENCES h l o 12 J l At 1000 (c) on 12/12/80 raode 5. notificition was received that interlocks on the i

m l emergency feede.r breakers to the 6.9-kV shutdown boards could allow the diesel l

Io1.I l gent.rators to connect to the shutdown boards without operating the lo'ad serieeino l

[ o t s j l relays and result in diesel generator overloading. This condition could occur if a i

I o !6 I I blackout signal was initiated with the diesel Renerators already running at rated l

l a l r l I voltage and frequency but not tied to the shutdown boards. Entered action statement l

10181 l 3.8.1.2.

There was no effect on public health or safety. Previous occurrences - none.I STSTEM

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lilil l diesel generators already operating at rated voltage. Interlocks were added to the

,,,,i l emerEency feeder breaker automatic closure circuits to ensure that load shedding has a permissive allows the emergency feeder breakers to close'.

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lll1!Ii!II l!l 3 e io ss as Name of Preparer W. T. Cottle/A. H. Gelston Phone 615-842-8261 R O '! 9 0 0 OM h