05000324/LER-1981-026-03, /03L-0:on 810220,primary Containment Atmospheric Monitor Oxygen Analyzer 2-CAC-ATH-1259-2 Falsely Indicated Low Drywell Oxygen Concentration.Caused by Defective Photohelic Gauge.Gauge Replaced

/03L-0:on 810220,primary Containment Atmospheric Monitor Oxygen Analyzer 2-CAC-ATH-1259-2 Falsely Indicated Low Drywell Oxygen Concentration.Caused by Defective Photohelic Gauge.Gauge Replaced

ML20003D569
Person / Time
Site:	Brunswick
Issue date:	03/20/1981
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20003D565	List: 05000324/LER-1981-026, Forwards LER 81-026/03L-0 05000324/LER-1981-026-03, /03L-0:on 810220,primary Containment Atmospheric Monitor Oxygen Analyzer 2-CAC-ATH-1259-2 Falsely Indicated Low Drywell Oxygen Concentration.Caused by Defective Photohelic Gauge.Gauge Replaced
References
LER-81-026-03L, LER-81-26-3L, NUDOCS 8103270674
Download: ML20003D569 (2)

LER-1981-026, /03L-0:on 810220,primary Containment Atmospheric Monitor Oxygen Analyzer 2-CAC-ATH-1259-2 Falsely Indicated Low Drywell Oxygen Concentration.Caused by Defective Photohelic Gauge.Gauge Replaced

Event date:
Report date:
3241981026R03 - NRC Website

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EVENT DESCRIPTION AND PROSABLE CONSEQUENCES h i

l During a normal reactor startup with the drvwell do-inerted, the primarv containment

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g l analyzer, 2-CAC-ATH-1263-2 indicated the actual oxygen concentration of 19.5%.

l 1 event did not affect the health or safety of the public.

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LER ATTACHMENT - RO #2-81-26 Facility: BSEP Unit No. 2 Event Date: 2-20-81 This event occurred when the 1259-2 analyzer photohelic gauge failed causing the analyzer monitor to indicate a drywell oxygen concentration that was 3*. less than the actual concentration. During the investigation of this event plant Maintenance examined the failed gauge and determined it had failed as a result of excess moisture in the sample flow. As presently designed, these monitors encounter significant moisture in their sample flow due to the design of the piping configuration to the monitors.

Due to a history of sin ilar events involving moisture problems, a plant modification has been developed to replace-these monitors with others of a more reliable design. The sacple piping will also be modified to help remove the moisture problem of the monitored sample.

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