05000260/LER-1981-043-01, /01T-0:on 810815,4,160-volt Shutdown Board U-2 Was Made Critical from Cold Condition W/Start Bus Undervoltage Relays Out of Svc for Start Bus 1A.Caused by Personnel Error.Relays Were Reconnected

/01T-0:on 810815,4,160-volt Shutdown Board U-2 Was Made Critical from Cold Condition W/Start Bus Undervoltage Relays Out of Svc for Start Bus 1A.Caused by Personnel Error.Relays Were Reconnected

ML20010F115
Person / Time
Site:	Browns Ferry
Issue date:	09/01/1981
From:	Holder G TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010F112	List: 05000260/LER-1981-043, Forwards LER 81-043/01T-0 05000260/LER-1981-043-01, /01T-0:on 810815,4,160-volt Shutdown Board U-2 Was Made Critical from Cold Condition W/Start Bus Undervoltage Relays Out of Svc for Start Bus 1A.Caused by Personnel Error.Relays Were Reconnected
References
LER-81-043-01T, LER-81-43-1T, NUDOCS 8109090384
Download: ML20010F115 (2)

LER-1981-043, /01T-0:on 810815,4,160-volt Shutdown Board U-2 Was Made Critical from Cold Condition W/Start Bus Undervoltage Relays Out of Svc for Start Bus 1A.Caused by Personnel Error.Relays Were Reconnected

Event date:
Report date:
2601981043R01 - NRC Website

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3 U. S. NUCLE A") CEGULATORY COMMISSION.

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LICENSEE EVENT REPORT

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C LVENT DESCRIPTION AND PRO /4dLE CONSEQUENCES h c

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8,1 On 8/15/81 at 2102, while_ performing modificating on U-1 and U-2 4160 volt boards, U-2 was made critical from a cold condition with start bus undervoltage relays l o

I l out of service for the 1A start bus. (T.S. 3.9.A.4.e).

This condition was not

,i o 4 determined until 8/19/81 at 1145. There was no danger to the health or safety of I

0 s,1 g I the public. Redundant systems were available and operable. There were no previous l

l o i i similar events.

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40 el 42 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h During preliminary review of modification workplan which contained l M l Personnel arror.

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i the removal from service of the 1A start bus undervoltage relays, i i The relays l

g i recognized that the Tech. Spec. 4.9.A.4.e did not permit this activity.

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@ l were reconnected immediately on discovery of error.

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'l@nness,cc Valley Authority DF 15.2 llrowns Ferry Nuclear Plant 6/04/81 1,Rit SUPPL.liMENTAl. INFORMATION DFitO-50.,26,0. /.81043 Technical Specification involved 3.9.A.4.e_, _ _,

Heported Under Technical Specification,6_.7.2.a(2)

• D.it e due NRC:_.9/3/81

1) ate of Occut rence _ 8/15/81 Time of Occurrence,2102 -

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Identificati0n and 1)escription of Occurrence While performing modification on U-1 aid'0-2' 4160 voit shutdown boards, U-2

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was made criticd1 from a cold condition with start bus undeivoltage relays out>

of service for the 1A start bus.

i-Conditions Prior to Occurrence:

Unit i refuel Fg outage.

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Unit-2 in routine startup.

Unit 3 at 95%.

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Action specified in the Technical Specification Surveillance Requirements met f

due to. inopepi e enipment. Des _cribe.

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Nona l

t Personnel error. During preliminary review of j

Apparent Cause of Occurrence:

l inodification wdrEpTali which c'5ntained the removal from service of the 1A start l

bus undervoltage relays, it was not recognized that the Tech. Spec. 3.9.A.4.e There was another separate modification and work-did not permit this activity.

to be done relating to degraded voltage which existing Tech. Spec did allow.

i plan It was recognized start bus initiated logic modification needed to be done at the l

However, it same time separate degraded voltage modification was being done.

was not recognized start bus modification required a Tech. Spec. change which had l

I been submitted to-NRC but not approved.

There was no danger to the health or safety of the public, Analysis of Occurrence:

no release of activity, no damage to the plant or equipment, and no resulting significant chain of events.

Corrective Action

Undervoltage start bus relays were reconnected immediately i

This is considered a random event and no further upon discovery of the error.

control is required.

I recurrenc.!

1 Ifailure Data:

None

.Itetention :

Per' d - 1.ifetime; Responsibility - Document Control Supervisor

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