ML19291A868

LER 79-028/03L-0 on 790724:while Operating Diesel Generator 11 for Troubleshooting,Smoke Was Noted Coming from Exciter Control Cabinet 1C61C.Caused by Grounded Primary Winding in Exciter Potential Transformer T-54

ML19291A868
Person / Time
Site:	Calvert Cliffs
Issue date:	08/23/1979
From:	Lagiewski J, Rizzo P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19291A867	List: ML19291A866 ML19291A868
References
LER-79-028-03L, LER-79-28-3L, NUDOCS 7908280682
Download: ML19291A868 (1)

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68 69 EVENT DATE 74 'IS REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 i While operating #11 deisel generator for troubleshooting, smoke was noticed . I o 3 i coming from the exciter control cabinet 1C61C. At 1250, #11 deisel was removed i o ,  ; from service to detemine the cause of the problem. The remaining diesels and l o 3 , power sources were verified operable per Tech. Spec. 3.8.1.1. This is not a i o e  ; repetitive event. 1 oi7 l l o e i I 7 8 9 80 E CODE SL9C E COVPONENT CODE SLBCODE SU DE o 9 l ele l@ W @ A l@ l Gl El Ni El Rl Ai@ l Dl@ [_Z_j @

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,_ SEOUENTI AL OCCURRENCE REPORT REVISION LER RO EVENT YEAR R EPORT NO. COCf TYPE NO.

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l0 l010 l 3' 40 l gg 41 Jg 42 l Alg 43 A4 B 0l9l3l@ 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h iiic l Generator exciter potential trans former T-54 was found to have a arounded crimary I

, , lwindino. The transfomer, Baster part no.13T02747-001, was reolaced with a 1

, - l current, imorovec design transformer furnished by same manufacturer in accordance l

, ,, [ with FCR 79-1034. Additional transfomers are being procured to replace the same i

, , i transfomer in Emeroency Diesel Generators Nos.12 and 21. l 7 a 9 80

%P ER OTHER STATUS DISCO RV O!SCOVERY OESCRIPTION Operator Observation i e ST Y @S dl l0 [g l l NA l l Clgl l

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OF RELE ASE AMOUNT OF ACTIVITY LO2ATION OF RELE ASE i le l Zl RELEASE @D IZl@l NA l NA l 7 8 9 10 11 A4 45 80 PERSONNEL EXPOSURES NUYBER TYPE O ESC RIPT,0N i 7 10101 O l@l Z l@l NA l

' PE RSON~u'IN;UR,ES NUMBER DESCRIPTION Ol0101@l12 I x NA 7 8 9 11 80 LOSS OF OR D AMAGE TO F ACILITY

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Ie LZj@gl , NA I 7  ? 3 10 66 69 80 5 N AVE OF PAEPARER J. S. Laaiewski/P. G. Rizzo Ryoss. (301) 234-7942/7986 E