05000325/LER-1979-050-03, /03L-0:on 790904,during Normal Operation,Drywell Oxygen/Hydrogen Monitor CAC-1263 Was Observed Making Step Increase.Cause Unknown.Instrument Recalibr & Returned to Svc Satisfactorily

/03L-0:on 790904,during Normal Operation,Drywell Oxygen/Hydrogen Monitor CAC-1263 Was Observed Making Step Increase.Cause Unknown.Instrument Recalibr & Returned to Svc Satisfactorily

ML19209B243
Person / Time
Site:	Brunswick
Issue date:	10/01/1979
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19209B237	List: 05000325/LER-1979-050, Forwards LER 79-050/03L-0 05000325/LER-1979-050-03, /03L-0:on 790904,during Normal Operation,Drywell Oxygen/Hydrogen Monitor CAC-1263 Was Observed Making Step Increase.Cause Unknown.Instrument Recalibr & Returned to Svc Satisfactorily
References
LER-79-050-03L-01, LER-79-50-3L-1, NUDOCS 7910090371
Download: ML19209B243 (1)

LER-1979-050, /03L-0:on 790904,during Normal Operation,Drywell Oxygen/Hydrogen Monitor CAC-1263 Was Observed Making Step Increase.Cause Unknown.Instrument Recalibr & Returned to Svc Satisfactorily

Event date:
Report date:
3251979050R03 - NRC Website

text

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LICENSEE EVENT REPORT

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0 5 uRCE 7

8 60 61 DOCKdT NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEC UENCES h lDuring normal plant operation, the operator noticed that the drywell oxygen / hydrogen o

2 f5T31 Imonitor, CAC-1263, made a step increase for -

apparent reason. Drywell oxygen con-l ITITl I centration did not exceed 47..

l [TTTl Technical Specifications 3.6.6.4, 6.9.1.9b l

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42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h Li o l A calibration check _ found that the instrument "zero" had shifted approximately 407.

m l for no apparent reason, giving about a 27. shift in the monitor. The instrument was rqT) l recalibrated and returned to service satisfactorily. As this is the first time that ;

g l the instrument has been out of calibration since going to a biweekly calibration, j

I this is considered an isolated event and no further action is required.

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PERSONNEL EXPOS ES NUMBER TYPE

DESCRIPTION

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A. C. Tollison, Jr.

NAME OF PREPARER PHONE: