ML19323J043

LER 80-063/03L-0:on 800513,operator Mistakenly Tripped Normal Feeder from 6.9 Kv Unit Board 2B-B W/O Putting Synchroscope Switches to on Position.Loss of Power to 6.9 Kv Shutdown Board 2A-A Resulted.Caused by Operator Error

ML19323J043
Person / Time
Site:	Sequoyah
Issue date:	06/11/1980
From:	Record D TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19323J039	List: ML19323J038 ML19323J043
References
LER-80-063-03L, LER-80-63-3L, NUDOCS 8006170691
Download: ML19323J043 (2)

Text

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ITTTl I without putting the synchroscope switches to "ON" position. This caused I s loss o'f power to 6.9-kV shutdown board 2A-A. The blackout signal I o o l causes all D/G's to start. During the recovery, all D/G's were i io p ,l l made inoperable for sa 10 minutes. LCO 3.8.1.1 l FTm I l

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j LER SUPPLEMENTAL INFORMATION I

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l SQRO-50-327/ 8063- Technical Specification Involved 3.8.1.1 1 Reported Under Technical Specification 6.9.1.13.b i

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Date of Occurrence: 5/13/80 Time of Occurrence: 1320 Un it 1 Identification and Description of Occurrence:

During the performance of SMI-1-D/G on D/G 2A-A, the operator mistakenly tripped the normal feeder from 6.9-kV unit board 2B-B .without putting the synchroscope switches to "0N" position.

This caused loss of power to 6.9-kV shutdown board 2A-A. The blackout signal caused all 4 D/G's to start. During the recovery all D/G's were made inoperable for GE 10 minutes to reset relays.

Conditions Prior to Occurrence:

Unit 1 in Mode 3 RCS Tavg = 5450 F Pressurizer pressure = 2235 psig.

Apparent Cause of Occurrence:

An unclear specific main:enance instruction directed the operator to inadvertently de-energize the shutdown board. This caused all fcur D/G's to start for a blackout signal. The operator failed to

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recognize this as a station blackout condition and refer to E0I-5 and he subsequently emergency tripped all four D/G's. A ten minute period when all D/G's were inoperable occurred while all lockout relays were being reset.

Analysis of Occurrence:

There was no danger to the public health and safety because there is no radiated fuel onsite.

• Corrective Action:

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The SMI is being reviewed and revised to prevent a recurrence of inadvertent de-energizing of a shutdown board. Specific steps and signoff will be inserted to prevent this. A section is being added

• to shutdown board SOI's adapting the station blackout recovery from E01-5 to be used as'a recovery instruction on any emergency start of the D/G's. This instruction leaves the diesels running until all

' relays are reset.

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Failure Data:

N/A

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