ML20081M753

Ler 83-064/99T-0:on 831024,Westinghouse Notified Util of Potentially Defective Relays SA1.Relay Used in Class IE Switchgear for Diesel Generator Protection & May Cause False Trip Output to Diesel Generator.Caused by Mfg Deficiency

ML20081M753
Person / Time
Site:	Mcguire, McGuire
Issue date:	11/07/1983
From:	Mcdowell W DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20081M713	List: ML20081M712 ML20081M753
References
LER-83-064-99T, LER-83-64-99T, NUDOCS 8311170360
Download: ML20081M753 (1)

Text

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES O'o l o l2 l l On 10/24/83 Westinghouse notified Duke Power of potentially defective sal relays.l

, This relay is used in Class lE switchgear for diesel gene mtor protection and may ;

cause a false trip output to the diesel generator. The occurrence of such an l g,y,g; event is considered extremely remote and power would be supplied by the unaffected; esel generaW und de aHeded Mesel generator cod be restad. Ms lol6ll l l, j 7 l l situation is reportable per Technical Specification 6.9.1.10(e) . l IoIe1l "

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• 4, 33 SS CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l110II The cause of this problem is a manufacturing deficiencv. Tantalum canacitors in l 1111ll SA1 relavs are subject to electrol ytn lonknen. RA1 relnym nre innnected/ tested l l t l 2 l l regularly. No false trips have ever occurred due to sal relays. New silicon con-l l l 3 l l trolled rectifiers and hermetically sealed capacitors will be installed by l l i l 4 l l August 1,1984. *

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NAME OF PREPARER W. H. McDowell PHONE: (704) 373-8878