ML19242A690

LER 79-054/03L on 790702:during Periodic Testing, B21-LIS-NO17 C Switch 1 Was Out of Tolerance Low.Caused by Instrument Drift.Instrument Recalibr & Returned to Svc

ML19242A690
Person / Time
Site:	Brunswick
Issue date:	07/31/1979
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19242A689	List: ML19242A688 ML19242A690
References
LER-79-054-03L, LER-79-54-3L, NUDOCS 7908030423
Download: ML19242A690 (1)

Text

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d e t, Er* ' H L T) 8 ci LVENT D ATE 14 Lb'hile performing PT 1,_1.4PCa_ Reactor low wat_tr_ lev _el n1 Channel Calibration. I j ,

LB21-LIS-N017 C, switch I was found to be out of tolerance low. The required value is l io .

[h12_. 5 inches of water and the as found value was 7.07 inches of water. I io s LTechnical Speci_fications 2.2.1, 6.9.1.9a l e s l l 317 l l o -

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>1 e l The only reason determined was instrument drift. The instrument was recalibrated and ii i returned to service A_p_lan_t_ modification has been written to replace the bi-stable 1 l switches with analog instrumentation during the 1980 refueling outage. This new j i > l instrumentation is much more stable and should greatly reduce the drif t problems now l la lbeing encountered. _

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