05000327/LER-1980-063-03, /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

/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: 05000327/LER-1980-063, Forwards LER 80-063/03L-0 05000327/LER-1980-063-03, /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
References
LER-80-063-03L, LER-80-63-3L, NUDOCS 8006170691
Download: ML19323J043 (2)

LER-1980-063, /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

Event date:
Report date:
3271980063R03 - NRC Website

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j LER SUPPLEMENTAL INFORMATION

- l SQRO-50-327/ 8063-Technical Specification Involved 3.8.1.1 1

Reported Under Technical Specification 6.9.1.13.b i

Date of Occurrence: 5/13/80 Time of Occurrence:

1320 U it 1 n

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:

0 Unit 1 in Mode 3 RCS Tavg = 545 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 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.

Failure Data:

N/A

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