ML19259B496

LER 79-002/03L-0 on 790208:plant Computer Failed,Causing Loss of Control Element Assembly Pulse Counting Circuit Indication;Failed Again on 790212.Caused by Problem W/Power Supply Connections

ML19259B496
Person / Time
Site:	Calvert Cliffs
Issue date:	02/22/1979
From:	Davis S, Romney K BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19259B495	List: ML19259B494 ML19259B496
References
LER-79-002-03L, LER-79-2-3L, NUDOCS 7902260422
Download: ML19259B496 (2)

Text

NH t 6 U. S. NUCLE AR REGUL ATORY COMMISSION 17-7 7) =

LICENSEE EVENT REPORT h CONTROL stoCx: l l l l l@ (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) lo lil 8IM 7 9 10 ILICENSEE C l CCODE IN 11 l@l 010 - 1010 14 15 l010 0 l- l010 25I@l411 l11111 l@l l Ig LICENSE NUVBER 26 LICENSE TYPE JO $7 CAT 58 CON'T o 1 5$RC, l L l@l 0 l 5 l 0 l 0 l0 l 3 1 l 768l@l690 12 EVENT0 8 719l@l01212121719l@

7 8 60 61 DOCKET NUMBER DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONJEOUENCES h O 2 l At 0800 the plant computer failed causina a loss of control element assembly I o 3 l(CEA) pulse counting circuit indication and incore detection system required l

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l o 14 j lby T.S. 3.1.3.3.d and T.S. 3.3.2, respectively. Reactor power was reduced to l O s 1 81% at 1705 to satisfy the requirement of T.S. 3.2.1. A procedure was initiated I o e lat 1900 to monitor CEA pulse cot-Linn indication in the cable spreadina room to 1 0 7 l satisfy T.S. 3.1.3.3.d. The computer was returned to service at 1340 on 2/9/79. I o g At 1300 on 2-12-79 the plant computer again failed causing a loss of control (CONT) I C DE CODE SUBCO E COMPONENT CODE St BCODE SU ODE lOl9l 7 8 l Il E10 l@ W@ l A l@ lI lN IS lT R lU18l@ [_X_j@

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L EVENT YE A R REPORT O C DE N

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_ 21 22 23 24 26 27 N W 30 31 32 KEN AC ON ON PLANT M T HOURS 22 S B IT D FOR b 8. SUPPLIE MANUFAC URER

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i o i In consultation with the ecuinment vendor the Read Amplifier Card was replaced. I li li l I Power was annlied and the system restarted with no apparent problems and no loss I i 2 lof stored data. At the second failure the vendor indicated a problem with the l 3 a l power supply connections. The connections were cleaned and tiahtened. The l ,

i 4 I oriainal Read Amplifier Card was reinstalled. The equipment was restarted (CONT) J 7 8 9 80 A S  % POWER OTHER STATUS dtSCO R DISCOVERY DESCRIPTION I. s LEJ@ 1019 I 5 l@l NA l lA[@l Operator Observation l ACTIVITY CO TENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE 6 NA 1

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PERSONNe t ExPOSOeS NUMBE R TYPE DE SCRIPTION li l 71 l 01010l@l Zl@l NA l 80 PE RSONN E L INJUHIES NUVBER DESCRIPTION 7

1 a 8 9 10101Ol@l12 li NA 80 l

LO*,5 OF OR DAMAGE TO F ACILITY TYPE DESCRIPTION i 9 NA 8 9 LZJ@l10 I 7 80 DESCRIPTION Qh h NRC USE ONLY ,

1:I I L_N_fhl10 ISSUE NA l lllllllllll j 7 8 9 68 69 80 NAME OF PREFARER S. M. Davis /K. M. Romney PHONE:

4 LER 79 02/3L DOCKET NUMBER 50-317 LICENSE NO. DPR-53 EVENT DATE 02/08/79 REPORT DATE 02/22/79 ATTACHMENT EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (CONT):

element assembly (CEA) pulse counting circuit indication and incore -

detection system required by T.S. 3.1.3.3.d and T.S. 3.3.3.2, respectively.

A procedure wa: initiated at 1430 to monitor CEA pulse counting indication in the cable spreading room to satisfy T.S. 3.1.3.3.d. The computer was returned to service at 1730. LER 78-39 (U-1) describes a similar event.

CAUSE & CORRECTIVE ACTIONS (CONTINUED):

with no problems and returned to service. No further corrective action is necessary.

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