ML19209A304

LER 79-038/03L-0:on 790829,115-volt Power Supply to Hydrogen Analyzer O-AE 6527 Was Inoperative.Caused by Shorted Winding in Power Transformer T-1

ML19209A304
Person / Time
Site:	Calvert Cliffs
Issue date:	09/28/1979
From:	Heibel R, Rizzo P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19209A299	List: ML19209A298 ML19209A304
References
LER-79-038-03L, LER-79-38-3L, NUDOCS 7910030494
Download: ML19209A304 (1)

Text

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7 8 9 LICENSEE COOE 14 15 LICENSE NUMBER CON'T i

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?S 912 REPORT DATE 80 EVENT DESCRIPTION AND PROSABLE CONSEQUENCES h O 2 lWhile performino a routine surveillance test. it was discovered that the 115 I O 3 Ivolt power supply to hydrogen analyzer 0-AE-6527 was inoperative (T.S.3.6.5.1).

1014 l l Hydrogen analyzer 0-AE-6527 was repaired and returned to service on 8/31/79. The i O s tredundant hydrogen analyzer remained in operation throuchout this event. This I i O 16 l lhas not been a repetitive event. I 10171 I O 8 l

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,,,,, 21 22 23 24 26 27 28 29 30 31 32 NT HOURS 22 58 i FOR S. SUPPLIE MANUFACTURER Wg K N A O gg lA lgl34((g hPg [6MEY [g l0l0l0l l lN [g l0 l0 [9 l6 [g 33 35 3 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i O ITroubleshooting disclosed the Delphi Model B1B oower transfomer T-1 had a I ii iii ishorted secondary winding. There was no other failed Comporient which rnav have i

, , ibeen a primary cause for transformer failure. The occurrence is wnsidered to 3 jbe an end-of-life failure; no preventive action is necessary. I i A I 7 8 9 80 STA  % POWER OTHER STATUS OISCO RY OISCOVERY DESCRsPTION l TTI IE lg l0 l 9 [ 9 [gl NA l lB l@l'8 Surveillance Test

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