ML19209D131

LER 79-056/03L-0:on 791001,output Voltage of Diesel Generator 11 Reached 4,800 Volts.Diesel Trip Occurred During Attempt to Lower Voltage.Caused by Loss of Calibr in Voltmeter Resistor.Resistor Replaced & Meter Recalibr

ML19209D131
Person / Time
Site:	Calvert Cliffs
Issue date:	10/12/1979
From:	Bauer E, Heibel R BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19209D128	List: ML19209D127 ML19209D131
References
LER-79-056-03L, LER-79-56-3L, NUDOCS 7910190436
Download: ML19209D131 (1)

Text

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- EVENT DESCRIPTION AND PROBABLE CONSEOUENCES O'o o 2 lDurina a surveillance test of 11 deisel aeneratcr the indicated output voltage  ;

o 3 lwent to 4800 volts. While attempting to lower the voltage, the diesel tripped l Lo 4 lon undervoltage. #11 diesel generator was removed from service at 1335 10/1/79 and i o s Ireturncd to service at 1810 10/1/79. While'the diesel was inoperative, remaining l This is not a repetitive g o e [ A.C. sources were checked in accordance with T.S.3.8.1.1.

l 0 7 l occurrence.

l o 8 l 80 DE C SUB COMPONENT CODE SU8 Code SU E O 9 l E l E lg [Eg j E lE@ l Il Nl Sl Tl R' Ul@ l X l@ lX l@ 18 19 20 7 8 9 10 11 12 13 OCCURRENCE REPORT REVislON

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23 24 26 27 21s 29 30 31 32 22 M MOURS 22 58 i FOA S. SUP LI R MANUFACTURER T N A O ON PL NT lAlgl34Z jg {3bg jZ @ l 0] 0l 0l l lNg l2Nj g l3Alg lW l1 l2 l0 lg 36 37 40 41 4 4 44 47 33 CAUSE JESCRIPTION AND CORRECTIVE ACTIONS h i o linvestination of the faulty voltreter showed tha+ its A.C. calibratina series I 1

i i t resistor had come out of tolerance and was causina the neter to indicate 900

, 7 l volts higher. The faulty resistor was reolaced with a new 73.5 KIl resistor I i 3 land the meter was recalibrated. This is not a ceneric croblem, there is no I I

i 4 f orevious historv of these resistors failino or nalfunctioninn.

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