05000324/LER-1983-038-03, /03L-0:on 830401,inoperative & Rod Block Signal Received from Rod Block Monitors a & B Upon Selecting Indicated Control Rods.Caused by Defective Multiplexer Cards in Monitors.Cards Replaced & Monitors Returned to Svc

/03L-0:on 830401,inoperative & Rod Block Signal Received from Rod Block Monitors a & B Upon Selecting Indicated Control Rods.Caused by Defective Multiplexer Cards in Monitors.Cards Replaced & Monitors Returned to Svc

ML20023B682
Person / Time
Site:	Brunswick
Issue date:	04/28/1983
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20023B679	List: 05000324/LER-1983-038, Forwards LER 83-038/03L-0 05000324/LER-1983-038-03, /03L-0:on 830401,inoperative & Rod Block Signal Received from Rod Block Monitors a & B Upon Selecting Indicated Control Rods.Caused by Defective Multiplexer Cards in Monitors.Cards Replaced & Monitors Returned to Svc
References
LER-83-038-03L, LER-83-38-3L, NUDOCS 8305050267
Download: ML20023B682 (1)

LER-1983-038, /03L-0:on 830401,inoperative & Rod Block Signal Received from Rod Block Monitors a & B Upon Selecting Indicated Control Rods.Caused by Defective Multiplexer Cards in Monitors.Cards Replaced & Monitors Returned to Svc

Event date:
Report date:
3241983038R03 - NRC Website

text

f, U.S. NUCLEAR REGULATORY COMMISSIO'N LICENSEE EVENT REPORT i

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LICENSE NUMBER 25 26 LICENSE TYPE Ju 57 CAT $8 CON'T IOI1l 3o,nes lb @l0 l5 l0 l-l 0 l 3 l 2 l 4 Ql 0 l 4 l 0 l1 l 8 l 3 @l 0 l 4 l 2 l 8 l 8 l 3 l@

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60 61 DOCK ET NUMBER 68 69 EVENT DATE 74 75 REPOR r DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h

o,3, g During unit power operation when control rods 06-19, 10-19, and 10-15 were selected,

, an " Inoperative and Rod Block" signal was received from RBM A, and when control l

, rods 34-47 and 30-47 were selected, an " Inoperative and Rod Block" signal was received l

,g,g, from RBM B.

This event did not affect the health ard safety of the public.

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10171 l I

Technical Specifications 3.1.4.3, 6.9.1.9b l

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33 34 35 36 31 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i 101 l A defective first level No. 1 multiplexer card in RBM A and a defective first level l

No. 5 multiplexer card in RBM B caused both monitors to initiate the inoperative and rod block signals. The defective cards, both No. 145C3105AAG001, were replaced l

y and both RBMs were returned to service. No further action regarding this event is l

y l P anned.

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% POWER OTHER STATUS DIS O RY DISCOVERY DESCRIPTION 11 15 l l E lg l0 l 6 l0 l@l NA l

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ACTIVITY CO TENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE NA l

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8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE

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8305050267 830428 TOSS Or OR DNAGE To FACILITY PDR ADOCK 05000324 S

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DESCRIPTION

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8 9 to 68 69 80 3 NAME OF PREPARER PHONE: