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

mm* - LICENSEE EVENT REPORT CCNTROL BLOCK: l l l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6 FITliMI01ClCINl1l@l010l-l010l01010l 14 LICENSE NUMBER 1010l@l4Il111111l@l57 CAT 25 26 LICENSE TYPE JO I

58 l@

7 8 9. LICENSEE CODE 15 CON'T o 1 S7,5 L j@l 0 l 5 l 010 l 0 l 31117 68 l@l11010111719 69 EVENT DATE 74 l@l110111217 75 REPORT DATE lo80l@

7 8 60 61 DOCKET NUM8 ER

- 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 SEQUENTIAL EVEN' YE AR REPORT NO. CODE TYPE N O.

LE R/RO

@ 4eg l217 l9 l_l l 01516l l/l LO I 3 l L l-l l0]

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.

% POWER OTHER STATUS DISCO RY DISCUS ELY DESCRIPTION ST S Operator Observation i s lEl@ lll0l0l@l NA l Bl@l l ACTIVITY CONTENT AMOUNT OF ACTIVITY LC JATION OF RELE/SE ret 6 l ASE@oOFRELEASEl NA Zlg l l NA l 1 l PERSONNEt ExPOSOES NUMBER TYPE DESCRl* TION t 7 l0l0l0l@lZl@l NA l iES Nuv8Ea 1 a PERSONNEL - uESCRiPriON@ NA l0l0l0l@l 80 l

7 8 9 11 12 w.' ' "fa^PWr**" @ l174 016 i 9 [Zj@l NA l

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S l NA l 68 69 llllllll1111l; 80 5 7 8 9 10 PHONE: (301) 234-7943/7917 2, NAME OF PREPARER