05000259/LER-1981-039-03, /03L-0:on 810703,inverter for Alarm Panel XA-55-8E Became Inoperable.Caused by Failure of Inverter Control Card.Card Replaced & Successfully Tested

/03L-0:on 810703,inverter for Alarm Panel XA-55-8E Became Inoperable.Caused by Failure of Inverter Control Card.Card Replaced & Successfully Tested

ML20009H529
Person / Time
Site:	Browns Ferry
Issue date:	07/30/1981
From:	Holder G TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009H526	List: 05000259/LER-1981-039, Forwards LER 81-039/03L-0 05000259/LER-1981-039-03, /03L-0:on 810703,inverter for Alarm Panel XA-55-8E Became Inoperable.Caused by Failure of Inverter Control Card.Card Replaced & Successfully Tested
References
LER-81-039-03L, LER-81-39-3L, NUDOCS 8108100213
Download: ML20009H529 (2)

LER-1981-039, /03L-0:on 810703,inverter for Alarm Panel XA-55-8E Became Inoperable.Caused by Failure of Inverter Control Card.Card Replaced & Successfully Tested

Event date:
Report date:
2591981039R03 - NRC Website

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n t,u GI DOCKET NUMBER 68 63 EVENT DATE 74 75 REPORT DATE 80 EVEN T OESCntrTION AND PROBABLE CONSEQUENCES h 101.'] l During refueling outage, while performing SI 4.11.C 3 & 4, the inverter for alarm l

ln ;3l l panel XA-55-8E became inoperable. The inverter control card was tightened in its l

l n [. l l slot arvi began to operate. The next day while perfonning SI 4.11.C 3 & 4, it I

o s l again became inoperable.

(See T.S. 3.ll.C.1).

There waE no danget to the health 1

l o l r, l l or safety of the public. There were no redundant systems. Previous similar event:

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31 40 41 42 43 44 47 CAUSE OESCRIPTION AND CORRECTIVE ACTIONS l i l o l l The inverter control card for alarm panel XA-55-8E failed. The Lundell inverter l

1 i I ij L control card model 1265A was replaced, successfully tested, the anruw.ciator returned I I to service, and S1 4.11.C 3 6 4 complete successi'ully. This is considered a l

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identification ant! Deneription of Occurrene" While performing SI 4.ll.C' 3 & 4, the inverter control card for alarm panel XA-55-8E failed. It was tightened in its slot and began to operate. The next day while again performing S14.ll.C 3 & 4, it became inoperabie and power could not be restored.

1 Conditions Prior to Occurrence' Unit 1 in refueling outage.

Un'it 2 at 99%.

Unit 3 at 99%.

Action spec ified in the Technical Specification Surveillance Requirements met l

d:se to inoperable espipment.

Desc ribe.

Met surveillance requirements of T.S. 3.11.C.2.

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i App.trellt QtuSe of ()"currence-Loss of power to panel XA-55-8E.

Cause is unknown.

4 Analy:.is, of, Ocep rrence i'-

There was no-danger to the health or safety of the public, no release of activity, no damage'to the plant or equipment, and no'resulting significant

. chain of events.

Corrective Action

When power to panel first failed, the inverter card for panel XA-55-8E was tighted in its slot and the annunciator operated. The next day while again performing SI 4.ll.C 3 & 4, the inverter'again failed and power could not be restored. The inverter control card was replaced, successfully.

tested, and returned to' service. This is considered a random failure and_no further recurrence control is required.

Failure Data:

BFRO-50-296/79015.

!!ctention.:

P (1 - I.ifetime; llesponsibility - Document Control Supervisor -

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