ML20064E349

/03L-0 on 781105:Control Oper Received Control Rod Drift Alarm for Rod 10-31.When Rod Position Display Was Selected,A False 3 Was Superimposed on Actual Rod Position Due to Aground on the Rpls Probe

ML20064E349
Person / Time
Site:	Brunswick
Issue date:	11/06/1978
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:
Shared Package
ML20064E344	List: ML20064E340 ML20064E349
References
LER-78-078-03L, LER-78-78-3L, NUDOCS 7811160141
Download: ML20064E349 (2)

Text

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LICENSEE EVENT REPORT CQ'4 ? POL e LOCK: l l l l l l lh (PLE ASE PRINT CA TYPE ALL REQUIRED INFORMATioN) l lo lil [N ] C j B 1 E I p ] I j@l 0.10 l - LectNSE .

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le 7$ REPORT D AT E 7 8 E,3 61 DOCK ET NWYd E A EVENT DESCRIPTION ANo PROB ABLE CONSEQUENCES h g) A control operator received the control rod drif t alana for rod 10-31. tihen the I rod position display was selected, a false "3" position was superimposed on the f io i3l l actual rod position. I

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l i l o l I The position of control rod 10-31 tm 4 nd f only va,-f rf n A hy -fir,3 t he . ~s

,,,,,j to an operabic reed switch position. It was determined that the superimposed "3" l l

, , , position was caused by a ground on thcEPIS probe. The position indication will bc I shutdown. Due to the large number of reed l g g g restored to normal during the next Unit i 4 l switches in use on both Units (14. 248 reed switches), this is considered an f sn1*nda0I co 7 8 9 oTHER STATVS 15 RY DISCOVERY CE5CRIPTION 57  % POWER y [E j@ l 0 l 9 l 7 l@l NA l l B l@l Operator Observation l ACTIVITY CONTENT LOC ATICN OF RELEASE RELEa5ED C# RELE A5E AvouNT of ACTIVITY i c tz_J @ L.:ij@l n i I n 80 I

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IIR 1-78-78 Continued event and no further corrective action is required.

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