ML19343A798

LER 80-040/03L-0:on 801017,during Normal Operation,Auxiliary Switch Failed to Return to Normal Position When 4160-volt Breaker Egi Tripped.Caused by Excessive Friction in Switch Operating Mechanism.Switch & Linkage Will Be Replaced

ML19343A798
Person / Time
Site:	Cooper
Issue date:	11/07/1980
From:	Lawrence L NEBRASKA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19343A796	List: ML19343A795 ML19343A798
References
LER-80-040-03L, LER-80-40-3L, NUDOCS 8011210491
Download: ML19343A798 (1)

Text

r NRC* FORM 366 U. S. NUCLE AR REZULATOf.Y COMMISSION (7 J7f '

LICENSEE EVENT REPORT CONTROL 8 LOCK: l l l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

, e l o I i l l N l E l C l P l Rl Igl 0l 0l- LICENSE l0 l0 NuM6EH l 0l 0l -l 0l 0l 0l g 4 LICENSE 25 26 l1 l1 TYPE l1l Jolj gj57 GAT l

bd lg 7 8 9 LICENSEE CODE 14 IS CON'T loI5l 7 6

[RC[ 60l L @l0 l5 l0OOCKET 63 l0 l012 NUM8ER l 9 l 86d @l69 11 EVENT Ol llD ATE 71 8l 0@l1 l 1REPORT 18 75 l 01718l DATE Ol@

80 EVENT DESCRIPTION AND PROSABLE CONSEQUENCES h Iol2l puring normal operation af ter completing diesel operability or ; .P. 6.3.12.1. the I l o t a l phite indicating light above control switch CS/1FS did not licht. The 4160V breaker l Io I4i EFS would not close automtically if breaker 1AF or IFA had trinppd. A CF eyna CRM l l o I s l hwitch located inside breaker FCI fnfled en return en cha n n emil nnaie4nn- Rraakar I l a 16 I h pq rn,,3 a wwg gon, nng,gggg ,,,,,11 7 _ pgannanne hna 1c ana fee neenrinena hrnnkove l l0(7l l remained operable. This occurrence presented no adverse effects upon public health I l o j a 1 pnd safety. Previous similar event reported on LER 76-60. RTS 3.9.A.1 1 80 7 4 3 SYSTEM CAUSE CAUSE COMP VALVE CODE CODE SUSCODE COVPONENT CODE SUSCODE SU8 CODE lo191 l El Blh [E_jh l A lh l C I K l T l B l R I K lh Wh (_) h 19 .'u I d 9 to it IJ 13 in

_ SE QU E N TI A L OCCUR R E NCE REPORT HEVISION LE R RO EVENTvEAR REPORT NO. CODE TYPE NO.

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.,,,. 2 1 22 23 24 26 27 28 29 30 31 J2 T KEN ACT ON ON PLANT VT HOURS SS ITT FOR UB. SUPPLIE MANUFACTURER lBj@ W@ W@ [Z_J@ l0 l0 l 0 ] Ol W@ l l@ l43A l@ lG l0 18 l047l@

33 J4 35 36 31 40 el 42 44 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l i l o l Irhe auxiliarv switch located inside 4160V breaker EG1 did not return to normal posi-l i , ,,j gtion when breaker EGl was tripped. The most probable cause was excessive friction ini

,,,,i gthe switch operating mechanism. Linkage was lubricated and operated several times. ]

i,i,l lThis switch and linkage on all 4160V breakers will be replaced with a new heavier j g iswitch at the first refueling outage af ter parts are available. I 7 3 9 80 STA ", POWER OTHER STATUS SCO RY DISCOVERY DESCR6PTION 1 s (_yj@ l 0 l 9 l 9l@l NA l W @l** Operator Observation l "d'T,vir, COLNT RELE ASE OP RELE ASE AMOUNT OF ACTIVITY LOCATION OF RELE ASE liIsl kJ @D hj@l n 44 l I 45 n

80 I

7 8 3 10 11 PE ASONNEL FxPOSURES NUYBE R TYPE D E SCRIP TION l' i l 7] 10 10 l 0 ' l@[z_J@l NA l

' ' PEsoNNEJ,N;UU,ES Now H oEscRirfiONh I' I i 1010 l 0 l@l N 4 11 11 NA 80 l

t :;w of JH nauAGE TO F ACILi rY .

WPE L E SC HsP TION l ' 191 [1J@l n l

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