05000327/LER-1980-129-03, /03L-0:on 800808,while Operating in Mode 2 at 3.5% Power,Diesel Generator 1A-A Failed to Start During Simulated Loss of Power to 2A-A 6.9-kV Shutdown Board.Caused by 43T (L) Switch Being Left in Test Position from Previous T

/03L-0:on 800808,while Operating in Mode 2 at 3.5% Power,Diesel Generator 1A-A Failed to Start During Simulated Loss of Power to 2A-A 6.9-kV Shutdown Board.Caused by 43T (L) Switch Being Left in Test Position from Previous Test

ML19338C929
Person / Time
Site:	Sequoyah
Issue date:	09/02/1980
From:	Record D TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19338C926	List: 05000327/LER-1980-129, Forwards LER 80-129/03L-0 05000327/LER-1980-129-03, /03L-0:on 800808,while Operating in Mode 2 at 3.5% Power,Diesel Generator 1A-A Failed to Start During Simulated Loss of Power to 2A-A 6.9-kV Shutdown Board.Caused by 43T (L) Switch Being Left in Test Position from Previous T
References
LER-80-129-03L, LER-80-129-3L, NUDOCS 8009080391
Download: ML19338C929 (2)

LER-1980-129, /03L-0:on 800808,while Operating in Mode 2 at 3.5% Power,Diesel Generator 1A-A Failed to Start During Simulated Loss of Power to 2A-A 6.9-kV Shutdown Board.Caused by 43T (L) Switch Being Left in Test Position from Previous Test

Event date:
Report date:
3271980129R03 - NRC Website

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6J 65 oOCK ET NUMOEH r,8 69 EVENT oATE 74 75 REPORT oATE 80 EVENT DESCRIPTION AND PRC8ABLE CONSEQUENCES h t o 121 l Unit 1 operating in node 2 at 3.5 percent power. Unit 2 preoperational test i

lo (3 ) l TVA-1331 in progress. At 1240 hours0.0144 days <br />0.344 hours <br />0.00205 weeks <br />4.7182e-4 months <br /> DG 1A-A failed to start from a simulated l

lo#4l l blackout signal on 2A-A shutdown board. This event resulted in unit ~1 entering Tech. l [oIsl l Spec. action 3.8.1.1.

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CAUSE DESCRIPTICN AND CORRECTIVE ACTIONS l ' 10 l l PG 1A-A failed to start due to 43T (L) test switch beint in the test pcsition.

1 I'Iii l The switch was niaced in the norcal position allowinn DC 1A-A to start. During l

[i l7i i nerforrvance of SI-7 on 8/6/80 at 0816 43T (L) was niaced in test and was not Iii3i i returned to nor=al at conclusion of surveillance. Instructions are being revised It,.Il to include nien off spaces for verification of DG standby readiness.

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LER SUPPLEMENTAL INFORMATION SQRO-50-327/80129 Technical Specification Involved 3.8.1.1 Reported Under Technical Specificaiton 6.9.1.13.c Date of Occurrence: 8/8/80 Identification and Description of Occurrence:

Diesel generator 1A-A failed to start during simulated loss of power to 2A-A 6.9-kV shutdown board. The 43T (L) switch for DG 1A-A was found in the test position which prevents the DG from starting on a loss of power, although the DG would still start automatically from a safety injection signal or manually.

Conditions Prior to Occurrence:

Unit 2 preoperational test TVA-13.B1 was in progress. The test called for a simulated loss of power to unit 2 "A" train equipment which would result in all 4 DG's starting and unit 2 "A" train equipment being sequenced in service.

Apparent Cause of Occurrence:

On 8/6/80, at 0816, the 1A-A DG 43T (L) switch was placed in test to perform SI-7 (DG Start from Simulated SIS). The 43T (L) switch was not placed back in the normal position according to the instruct-ions in SI-7.

Analysis of Occurrence:

A lack of communications between the RO and SRO caused each to think that the 43T (L) switch had been placed normal. SI-7 data sheet did not have a sign off to verify this action.

Corrective Action

SI-7 is being revised to include sign off spaces to place or verify DG's standby readiness upon completion of the surveillance. RO's and SRO's have been reminded to follow instructions as well as sign off's ou data sheets during performance of SI's.

SI-2 (Shift Log) has been revised to include a sign off verification of 43T (L) position.

Failure Data:

N/A