ML19309C350

LER 80-013/03L-0:on 800303,channel Zf Pressure Input Signal for Steam Generator Isolation 22 Was Bypassed.Caused by Signal Isolater 2-E/E-1023C Being Out of Calibr Due to Nonlinear Response

ML19309C350
Person / Time
Site:	Calvert Cliffs
Issue date:	04/02/1980
From:	Heibel R, Rizzo P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19309C344	List: ML19309C343 ML19309C350
References
LER-80-013-03L-01, LER-80-13-3L-1, NUDOCS 8004080488
Download: ML19309C350 (2)

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LICENSEE EVENT REPORT

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EVENT oESCRIPTION AND PROB ABLE CONSEQUENCES Oio i o 12 l l The channel ZF pressure input signal for #22 Steam Generator Isolation was l i o I a i i bypassed at 1000 on March 3,1980. The sensor channel indicator had displayed l 7

Io i4 I l a voltaoe deviation from the other three sensor channels. The sensor channel i Io I s I I was reoaired and returned to service at 1350, March 3,1980. The remaining I I o le 1 I three channels remained ooerable throuahout this event as reauired by T.S. 3.3.2.1. I Io I 7 I I LER 78-16 (U-2) describes a similar event. I Io la f l 80 1

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i l1 I O I I Sional isolator 2-E/E-1023C (Transmation Isolatina Transmitter Model #230fT) I i1 Ii1 I was found to be out of calibration due to non-linear response. The instrument i li i 21 1 cnirld not he recalibrated and was returned tn the maninfacturer fnr renair- I 11 131 l l i mi8 9 7 80 I

ST S  % PCWER OTHER STATUS 15 RY DISCOVERY CESCRIPTION

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NAVE OF PREPARER R. P. Heibel/P. G. Rizzo peong (101 Wo a7alia7ps {

LER NO. 80-13/3L DOCKET NO. 50-318 EVENT DATE 03/03/80 REPORT DATE 04/02/80 ATTACHMENT CAUSE DESCRIPTION AND CORRECTIVE ACTIONS:

Based on recomendations by the manufacturer, Facility Change Request 80-25 has been originated to allow replacement of several industrial grade capacitors with MILSPEC devices _to improve the reliability of this instrument. Contingent on approvals, it is estimated that the Field Change will be completed by January 1,1981.

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