ML19305D736

LER 80-008/03L-0:on 800308,after Performing Preventive maint,1/2 Diesel Generator Would Not Start from Control Room.Caused by Poor Electrical Contact Between Fuse & Clip. Fuse Clip Adjusted

ML19305D736
Person / Time
Site:	Quad Cities
Issue date:	03/27/1980
From:	Leech K COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19305D728	List: ML19305D727 ML19305D736
References
LER-80-008-03L-03, LER-80-8-3L-3, NUDOCS 8004150468
Download: ML19305D736 (2)

Text

/ NRC P RM 384 U.S. NUCLEAR RE2ULATCGY COMMISSION (7 77)

. . LICENSEE EVENT REPORT

]. CONTROL BLOCK: l l l l l l lh (PLEASE PRINT OR TYPE ALL REQUIRED INPORMATION) 6 Io TTl 7 8 9 l I I LLICENSEE l Q l CODE A lD l114l@[0 15 l 0 l 0l - l 0 l 0 l 0 l - l 0 l 0 l 0 25l@l 264 l 1LICENSE LICENSE NUMBER l 1 l 1TYPE l 1JOl@l57 CATl 58 l@

CON'T '

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REPORT D ATE 7 8 60 61 DOCKET NUM8ER 68 69 EVENT DATE l

EVENT DESCRIPTION AND PROBA8LE CONSEQUENCES h lOl2l l After having performed monthly preventive maintenance on the 1/2 diesel generator l

[ b"'TTl I it w uld not start from the control room. The 1/2 diesel generator was successfully I g g started locally and ran properly. Both the Unit One and Unit Two diesel generators I o 3 ; had been demonstrated operable in accordancae with Technical Specification 3.9.E.1. I O 6 l ln addition two offsite lines were available to provide power to the Station. I ITlTI l I 171T1 I I E CODE S SC E COMPONENT CODE SU8 COD'E SU E O 9 l E lE l@ W@ l A l@ lE lL lE lC l0 lN lh l Z l@ [Z_j 20 7 8 9 10 13 12 13 18 19 SEQUENTIAL OCCURRENCE REPORT REVISION LE R/RO EVENT YEAR REPORT NO. CODE TYPE NO.

@ ,Rg l218l01 22 l-l 23 l0 lo l8 l 24 26 l/l 1013 l 28 29 ltl 30

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[,0,,,,j 32 27 KN AC O O P NT ME HOURS 22 S8 I FOR b 8. SUPPL MANUF TURER l33El g ]34@ l35 Z lg l 0 l0 l0 l0 l [,YJ@ l42N l@ l43Nl@ l44E l 1 l 4 l 747l@

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h g l The 1/2 diesel generator control circuit would not function properly due to a coor I i i l electrical contact between fuse F24 and its fuse clio. The fuse clio was adiusted to I i 2 l provide proper electrical contact with the fuse, and the 1/2 diesel generator was I gl demonstrated to be fully operable. l i 4 l l 7 8 9 80 STA  % POWER OTHER STATUS I RY DISCOVERY DESCRIPTION g W@ l 0l 9 l 6 l@l NA l lBl@l Routine Test l ACTIVITY CO TENT RELEASED OF RELE ASE AMOUNT OF ACTIVITY LOCATION OF RELEASE 1 6 [Z_j @ l Zl @ l NA l l NA l

' eERSONNEt ExPOSUEES NUMBER TYPE DESCRIPTION W l *0* l 0 l o l@l Zl@l NA l PERSONNE L INJU' I ES NUV8ER DESCRIPTION i a NA l 7 8 9 l 0 l 0 l 0 l@l12 11 80 LOSS OF OR DAMAGE TO FACILITY TYPE DESCRIPTION Q [Z,,,j@l NA 80

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7 8 9 10

NRc uSE ONa 2 O ISSUE

[N @l0ESCRIPTION@ NA 8 00415 O { l llll;lllll lll I 7 8 3 to 68 69 80 5 NAME OF PREPARER -

PHONE: 309-654-2241 Ext. 177 E,

s

1. LER NUMB 2R: 80-08/03L-0

11. LICENSEE NAME: Commonwealth Edison Company Quad-Cities Nuclear Power Station lil. FACILITY NAME: Unit One IV. DOCKET NUMBER: 050-254 V. EVENT DESCRIPTION:

On March 8, 1980, at 2:30 P.M., it was discovered that the 1/2 diesel generator would not start from the control room.

Monthly preventive maintenance had Just been completed, and the discovery was made while attempting to perform the diesel generator load test, Procedure QOS 6600-1, as required by the diesel generator preventive maintenance outage report, QOS 6600-02. The diesel generator outage report 7 day limitation surveillance QOS 6600-01 was started innediately to meet the requirements of Technical Specification 4.9.E.1 for diesel generator operability. An attempt was made to start to 1/2 diesel generator locally from the diesel generator room. The diesel generator successfully started and ran properly. An investigation revealed a bent fuse clip for F2h in the diesel generator control circuit. After straightening the fuse clip, the 1/2 diesel generator was started successfully from the control room.

VI. PROBABLE CONSEQUENCES OF THE OCCURRENCE:

The safety implications of this occurrence wa.re minical, since each of the three diesel generators is capable of sustaining the necessary power for a safe shut-down of one unit for the cases of loss of offsite power with or without an accident occurring simultaneously. Both the Unit One and the Unit Two diesel generators had been demonstrated operable prior to taking the 1/2 diesel out of service for preventive maintenance.

In addition, there were at least two offsite lines available to provide power.

Vll. CAUSE:

The 1/2 diesel generator control circuit would not work properly due to poor electrical contact between the fuse and fuse clip.  ;

Vlli. CORRECTIVE ACTION: .

The fuse clip was adjusted to provide proper electrical contact with the fuse and the 1/2 diesel generator was demonstrated to be fully operable.

.