ML20040C349

Updated LER 81-039/03X-1:on 810721,supply Breaker for Heat Trace Circuits Found Tripped.Caused by Overcurrent Conditions.Leads on Output Side of Breaker Were Loose Causing Arcing & Resulting Corrosion.Leads Remade

ML20040C349
Person / Time
Site:	Cook
Issue date:	01/19/1982
From:	Palmer R INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20040C338	List: ML20040C337 ML20040C341 ML20040C346 ML20040C349
References
LER-81-039-03X, LER-81-39-3X, NUDOCS 8201270557
Download: ML20040C349 (1)

Text

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UPDATE LER PREVIOUS REPORT 9-18-81 '

" LICENSEE EVENT REPORT a

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6 (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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l 8' DOCKET NUMBER EVENT DATE 74 25 OATE EVENT OESCRIPTION AND PROBABLE CONSEQUENCES h t o 121 l DURING ROUTINE TOUR, A SUPPLY BREAKER FOR HFAT TRACF CIRCUITS WAS FOUND TRIPPED. THIS!

"B" HEAT TRACE CIRCUITS FOR THE BORON INJECTION TANK. l iO i3 i l BREAKER SUPPLIES POWER TO TRAIN iO i4 i l ON TWO OTHER OCCASSIONS, THIS BREAKER HAS BEEN FOUND TRIPPED. THESE CONDITIONS ARE l 1

THE FIRST EVENT l ioisl l NON-CONSERVATIVE WITH REGARDS TO TECHNICAL SPECIFICATION 3.5.4.2.

l l o is 1 l ON 7-21-81 WAS NOT DETERMINED REPORTABLE UNTIL 9-17-81.

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[1_J 32 21 22 23 24 26 27 28 29 KErI Ah0N ON PL NT M T4 HOURS 22 5 a IT D FORib 8. SUPPLIE MAN FACTURER l33B l@l34Z l@ lZl@ lZl@ l01010l0l l41N l@ l42Y ]@ l43N l@ lW l1 l2 l0 l@;

35 36 31 40 44 47 CAUSE OESCRIPTION AND CORRE'. *1VE ACTIONS l

lilotIDURING INVESTIGATION OF SIMILAR EVENT (LER# 81-061/03L-0) IT WAS DISCOVERED THAT THE li li l l SUPPLY BREAKER FOR THE HEAT TRACING WAS TRIPPING DUE TO OVER-CURRENT CONDITIONS.

!i i,i I LEADS ON THE OUTPUT SIDE OF THE BREAKER WERE FOUND TO BE LOOSE CAUSING ARCING AND l l,l3l l RESULTING CORROSION. THE LEADS WERE REMADE AND NO ADDITIONAL BREAKER PROBLEMS HAVE l l

[ii4 1 BEEN ENC 0UNTERED SINCE. NO FURTHER ACTION IS PLANNED AT THIS TIME.

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