ML20147B041

/03L-2 on 780822:on 6 Dates During Full Pwr Oper Supply Breaker to MCCL-62F Has Opened 8 Times.Spare Breaker Installed & Tripped 4 Times.Cause:Unidentified

ML20147B041
Person / Time
Site:	Kewaunee
Issue date:	09/21/1978
From:	WISCONSIN PUBLIC SERVICE CORP.
To:
Shared Package
ML20147B045	List: ML20147B041
References
LER-78-024-03L, LER-78-24-3L, NUDOCS 7810020220
Download: ML20147B041 (1)

Text

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'A 15'> LICENSEE EVENT REPORT U_PDATE REPORT-PREVIOUS REPORT DATE 08-11-78

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CNn a x block: [] l l l [_je @ (l'LF ASE l'RINT 08 TYPE AL L HEOUIREo INFORMAT6ON) i

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44 l 1 LICE l 1Nill 11Y PE.

l 1,J.1@[_LJ J $7 ( ,* f !, i @

L 9 t h'L NSE C cob [ 14 15 LICF NSL *J'.rVUi H

. QN 'I EE "50 LL J@l 013101010131013 l@LO_L8J212 M 0" l\ l NT DAIL I 718 j@LO I4 lb L91211 Hf Parti DATE I 7 L8j@ 80 E ti )_

El DOCAE1 NUVBEq EVENT DEdCHIFTION AND PROD ABLE CONSEQUENCES h g g [On six separate dates, all during full power operation, the supply breaker to j MCC1-62F has opened a total of 8 times. Each occurrence placed the facility under l g

LCO TS 3.7.b.6. In each case there was no apparent cause for the breaker trip and the ]

g ,j j A spare breaker was installed in MCC1-62F af ter a trip on_

9,g, breaker was reclosed.

l g g 3 97 78; this spare breaker has tripped on 7-17-78 and 8-22-78 a j

{gy l total of 4 times. Redundant safeguards trains were available. No ef fect on plant i operation or public safety. _jr,o

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CAUSE COMP. VALVE SYSTEM CAUSE SUP, CODE SUSCODE CODE CODE SUBCODE CoMPONLNT CODE

[ol9] l E lB lh [Xjh l Z lh l C lf3 K l T l B l R l K lh I D lh [Z_j h 1H 19 20 8 9 10 11 _ f2 HEVt5 TON SE QUEN U AL OCCURREN(J HEPORT HE PORT NO. CODE TYPE NO.

EVENT YE AH

@ g' HeS LE RO 17181 l-! 101214l l-l 10 l 31 l tj l_l [2j 32 28 29 Jo 31

_2 n 2J 23 24 26 21 HOUns 22 8 IT D F ort UB St Lit MA F CTI f EH AKI oN PL ANT T4 ACTO

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0;0l0l 40 l gg 41 l2N lg 4 l43Al@l44C l 0 l 8 l 0 l@ 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h I

[3 l o l l Troubleshooting has included visual inspection and performance testing of both ciretif t l

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i ;,, l breakers used in the MCC, megger checks of the MCC and its loads, and visual g ,,,g i nspection of the MCC enclosure. The cause for these breaker trips is still l

l l l i l 3 ) l unidentified. This report will ne updated when further information is available.

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W e 9 ST 5 ' POWER OTHE R ST ATUS bSoE Y D SCOVEllv' DESCRIPTION l A j@l Operator Observation l l

l1.{ kJ l E lQ l 1 l 0 l 0 l@l NA A TiVITY CC T E.NT LOS ATION oF RELE ASE ftELE ASED OF Rf LE ASF AMOUNT OF ACTivtTY NA l NA l lt Icl[4j@lZlgl l LJ 10 11 44 45

/ F 9 FT h5GNNE L E XPO5UHES F.UMB Eli TYPE Of SchlP TION '

l 11171 l 010 l 0 Jhl Zlhl NA PtHSONNE INJU lES NUMPfH DESCRIPTION l

12 1.I1010101@l i A 9 11 17 NA L o% Or on DAMAGE To F ACit iTV TYPE O( SCHIP TION l

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PUOL 6 CITY NRC UM ONLY

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