ML20005A804

LER 81-003/03L-0:on 810125,dc Input Fuse in 1DID Vital Inverter Blew,Causing Inverter to Lose Power source.1DIB Inverter Tripped When Ac Output Breaker Apparently Opened. 1DID Trip Caused by Blown Fuse.Cause of 1DIB Trip Unknown

ML20005A804
Person / Time
Site:	Oconee
Issue date:	02/24/1981
From:	Jackie Jones DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20005A800	List: ML20005A799 ML20005A804
References
LER-81-003-03L, LER-81-3-3L, NUDOCS 8107010283
Download: ML20005A804 (1)

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io,2i I On January 25. 1981. D. C. inout ruse in 1DID vital inverter blew, causing the g fTTT1I inverter to lose its power source. The 1DIB inverter tripped when A. C. out- g ITf71I out breaicer was aooarentiv opened while personnel were working on 1DID inverter, fTTTI l A second trio of IDID inverter occurred when personnel mistakenly opened A. C. :

i o #, i f outout breaker while de-energizing 1DID. Although both 1KVI3 and '.'r3*.'.D vere ,

lotrlI de-enereiz'ed, they were not simultaneous. Thus the health and safety of the ,

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t i 6 o 1 I The ftrs- trio of 1DID was caused by blown fuses. The cause of the 1D13 trip ,

ii e i i l is not exactly known. 1DID tripped again as a resul,t of the A. C. output ,

m I breaker mistakenly being opened. Fuses were replaced, inverters were returned ,

j i,,sii to service. and channels were reset accordingly. Guards will be installed on ,

l ii,.II all D. C. input and A. C. output breakers. ,

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!I Ii i ti iI rii ao wews ca >=sman , J. L. Jones suc~ e: (7041 373-3197 8107010283 810224 PDR ADOCK 05000269 S PDR