ML20147B318

/03L-0 on 780905:failure of 1-2A Diesel Generator to Respond to Voltage/Speed Control in Auto Due to Failure of Motorized Potentiometer(Failed Diodes)Causing the 125V DC Supply Fuses to Blow

ML20147B318
Person / Time
Site:	Farley
Issue date:	10/02/1978
From:	Hairston W ALABAMA POWER CO.
To:
Shared Package
ML20147B297	List: ML20147B293 ML20147B318
References
LER-78-061-03L, LER-78-61-3L, NUDOCS 7810100072
Download: ML20147B318 (1)

Text

NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION (7-77 )

LICENSEE EVENT REPORT C, , . ,

CONTROL BLOCK: l 1

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lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) lo l 1B l9 l A lLICENSEE I

L l J CODE l M l F14l 1]@l tb 0 l 0 l- l LICENSE 0 l 0 NUMUEH l 0 l 0 l 0 l- l0 l2b 0 l@l4 26 11 l1 l1l1l@lb7 LAT LICENSE TYPE JO l

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? 8 s$"C l00L l@l61 0 l 5 l DOCK 0 l ET0NUMB l 0ElH 3 l 4 l688 l@l b9 0]EVENT 9l 0lDATE 5l 71 8l@l1 74 7b l 0REPORT l 0 DATE l 2 l 7 l8 80 lh EVENT DESCRIP110N AND PROBABLE CONSEQUENCES h 10121 l on 9/5/78 while being started for maintenance, the 1-2A diesel nenerator would not I

[ _o l 3 l l respond to voltage or speed (frequency) adjustments in auto. T/S 3.8.1.1 requires I lo14IIthat two separate independent diesel generator sets be operable. The 1-2A diesel l lo isl [ generator was declared inoperable at 0835 on 9/5/78, and was returned to an operable I l o lo i l status at 1300 on 9/5/78. T/S 3.8.1.1 action statement requirements were met. The I l o ] 7 l l health and safety of the general public _were not af fected. I 10181I I SYST E M CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE lo191 7 8 l E l E l@ lE l@ lG lh l Il Nl Sl Tl Rl Ul@ lC l@ W @

9 10 11 12 13 18 19 20 SE QUEN TI AL OCCURRfNCE REPORT REVISION

,. EVENT YE AR REPORT NO. CODE TYPE N O.

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_ 21 22 23 24 26 27 28 29 30 31 32 AKEN A Tl N ON PL NT T HOURS CB IT D FOR [UB. U PLI MANUF AC URER lBl@lZl@ lZ l@ l36 Zl@ l Ol 0l Ol Ol l Nl@ lYl@ lAl@ l44B l 0 l 9 l 347 l@

33 34 3b 3/ 40 41 42 43 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l1 l O l l The f ailure of the 1-2A diese1~ generator to respond to voltage / speed control in auto l

_.1iiil Iwas due to the failure of a motor-operated potentiometer (failed diodes) which caused I g , ij . ; l the 125V DC supply fuses to blow. The motor operated potentiometer was repaired and I j 3 [3; l reinstalled, and the fuses were replaced. The 1-2A diesel generator was satisf actorily!

[3 l4l l tested per FNP-1-STP-28.1. A similar occurrence was reported in LER 78-060/03L-0. I 7 8 g 80 ST A S  % POWER OTHER STATUS IS RY DISCOVERY DESCRIPTION NA li 15 l l E l@ l 1l 0l 0l@l l l A l@l NA l ACTIVITY CON TE NT RELE ASED OF RE LE ASE AMOUNT OF ACTIVITY LOCATION OF RELE ASE l lt l6l8 9W @ l Zl@ l 1 10 11 NA 44 l l 45 NA 80 l

PtHSONNEL EXPOSURES ,

NUMBE R TYPE DESCRIPTION ' i l 1 l 71 l 0 l 0 l 0 l@l Z l@l NA l

, l PERSONNE L INJU IES NUMBtR DESCRIPTION 11 l>IIOI0l0l@l 7 8 9 11 12 NA 80 l

LOSS OF OR DAMAGE TO F ACillTV -

TYPE DE SCRIP 7 TON NA l1 [ 98 l 9l Z l@l10 l 1 B0 l ISSUg NRC USE ONLY l 2101 > n l N f@l ESCRIPT10 NA 9 l llllllllll llli i 10 66 69 80 5 7 N k M h ,,,,,,, W. G. Hairston, III ,, ,,o (205) 899-5156 2