ML19260C908

LER 79-052/03L-0:on 791226 & 28,control Element Assembly Motion Inhibit Was Inoperable Due to Repairs to Metrascope. Caused by Worn Bands on Metrascope Master Alarm Card Resulting in Improper Connection W/Printed Circuit Board

ML19260C908
Person / Time
Site:	Calvert Cliffs
Issue date:	01/25/1980
From:	Heibel R, Rizzo P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19260C909	List: ML19260C908
References
LER-79-052-03L-01, LER-79-52-3L-1, NUDOCS 8002060484
Download: ML19260C908 (1)

Text

NRC P,3RNI 1 6 U.S. NUCLEAR REGULATORY COMMISSION mu LICENSEE EVENT REPORT CONTROL BLOCK:

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lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 7 O i 8 I M ILICENSEE 9 DIC CODEl C l N l 2 l@15l0lOl-l0l0101010l-l0l0l@l4l1l1l1l1l@l 14 LICENSE NUMBER 25 26 LICENSE TYPE 40 l

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O i o,"JlLl@l 015 l 010 l 0 l 311 l 8 l@l 112121617191@l 01112l SI 8l O80l@ 74 7 8 60 61 DOCK ET NUVSER 68 69 EVENT QATE 75 REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h O 2 i CEA motion inhibit was inoperable from 1045 to 1107 on Decenber 26, 1979, O 2 I and from 1030 to 1413 on December 28. 1979. These two out of service periods i ITiT1 I were made necessary by recairs made to the metrascore. The CEA drive systen 1 O s I was placed in manual and CEA's withdrawn as recuired by T.S. 3.1.3.1 action I FTIT1 I 3. The redundant CEA indication systen renained operable throuchout these i O 7 I events. This is not a repetitive occurrence. I o a l I 7 8 9 do CDE OE SU C E COMPONENT CODE SUBCOCE SU E O 9 l R l B l@ [E_j@ [._Xj @ l I l N I S l T l R l U l@ l I l@ [Z_J @

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,_ SEOUENTIAL OCCURRENCE REPORT REVISION LER!RO EVENTYEAR R EPORT NO. CODE TYPE NO.

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33 34 36 37 40 el 42 43 44 CAUSE OESCRIPTION AND CORRECTIVE ACTIONS h i o i l The cause of these events was found to be worn lands on the Metrascote i i  ! Vaster Alarm Card resultino in imnroter connection with the crinted circuit I i 2 lboard's Connector causino an out of secuence alarm to ha i nit ia ted . Tha I

3 I board was recairad and raniaced intn the vo trucnro un nrav an+4va ac tinn I ii4 1 is deemed necessarv. I 7 8 9 90 STA  % POWER OTHER STATUS 05 O RY DISCOVERY DESCRIPTION i 5 [,E.j @ l ll 01 0l@ l NA l [ Aj@l Ooeratnr Observation I ACTIVITY CO0 TENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE i e NA l l NA i Z l @ l Zl@l l -

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