05000325/LER-1982-126-03, /03L-0:on 821201,primary Containment Atmosphere Oxygen Analyzer 1-CAC-AT-1259-2 Indicated Unexpected Downward Trend in Drywell Oxygen Concentration.Caused by Instrument Zero Shift.Analyzer Recalibr & Returned to Svc

/03L-0:on 821201,primary Containment Atmosphere Oxygen Analyzer 1-CAC-AT-1259-2 Indicated Unexpected Downward Trend in Drywell Oxygen Concentration.Caused by Instrument Zero Shift.Analyzer Recalibr & Returned to Svc

ML20028C261
Person / Time
Site:	Brunswick
Issue date:	12/30/1982
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20028C256	List: 05000325/LER-1982-126, Forwards LER 82-126/03L-0 05000325/LER-1982-126-03, /03L-0:on 821201,primary Containment Atmosphere Oxygen Analyzer 1-CAC-AT-1259-2 Indicated Unexpected Downward Trend in Drywell Oxygen Concentration.Caused by Instrument Zero Shift.Analyzer Recalibr & Returned to Svc
References
LER-82-126-03L-01, NUDOCS 8301070273
Download: ML20028C261 (1)

LER-1982-126, /03L-0:on 821201,primary Containment Atmosphere Oxygen Analyzer 1-CAC-AT-1259-2 Indicated Unexpected Downward Trend in Drywell Oxygen Concentration.Caused by Instrument Zero Shift.Analyzer Recalibr & Returned to Svc

Event date:
Report date:
3251982126R03 - NRC Website

text

NRC FOf}M 366 U.S. NUCLEAR REGULATORY COMMISSION g.721 LICENSEE EVENT REPORT CONTROL BLOCK: l l

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l (PLEASE PRINT CR TYPE ALL REQUIRED INFORMATION) 1 6

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60 61 DOCKET NUM8ER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 10l2l l Routine surveillance during plant operation revealed that primary containment atmo-l l O l a i Pphere oxygen analyzer, 1-CAC-AT-1259-2, was indicating an unexpected downward trend in l [o l4 l [drywell oxygen concentration. At the time, redundant instrument, 1-CAC-AT-1263-2 was I goisi l showing an expected indication of drywell oxygen concen'tration. This event did not l

lOl6l l affect the health and safety of the public.

l 10 l 7 l l Technical Specificctions 3.3.5.3, 3.6.6.4, 6.9.1.9b l

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40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i l 0 l l The 1259-2 analyzer had experienced an instrument zero shift resulting in the erroneoud l downward indication. The analyzer was recalibrated and returned to service.

Due to aI i i l history of similar events, these type CAC analyzers, Model No. F3M3 are being replacedI l as per an approved plant modification.

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