05000325/LER-1981-041-03, /03L-0:on 810411,primary Containment Atmospheric Monitor Oxygen analyzer,1-CAC-ATH-1259-2,tripped.Caused by Indicated Low Sample Flow Due to Monitor Sample Line Moisture Buildup in Photohelic Unit.Lines Dried

/03L-0:on 810411,primary Containment Atmospheric Monitor Oxygen analyzer,1-CAC-ATH-1259-2,tripped.Caused by Indicated Low Sample Flow Due to Monitor Sample Line Moisture Buildup in Photohelic Unit.Lines Dried

ML19350D670
Person / Time
Site:	Brunswick
Issue date:	05/08/1981
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19350D615	List: 05000325/LER-1981-041, Forwards LER 81-041/03L-0 05000325/LER-1981-041-03, /03L-0:on 810411,primary Containment Atmospheric Monitor Oxygen analyzer,1-CAC-ATH-1259-2,tripped.Caused by Indicated Low Sample Flow Due to Monitor Sample Line Moisture Buildup in Photohelic Unit.Lines Dried
References
LER-81-041-03L, LER-81-41-3L, NUDOCS 8105180320
Download: ML19350D670 (2)

LER-1981-041, /03L-0:on 810411,primary Containment Atmospheric Monitor Oxygen analyzer,1-CAC-ATH-1259-2,tripped.Caused by Indicated Low Sample Flow Due to Monitor Sample Line Moisture Buildup in Photohelic Unit.Lines Dried

Event date:
Report date:
3251981041R03 - NRC Website

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LER ATTACHMENT - RO # 1-81-41 Facility: BSEP Unit No.1 Event Date: 4-11-81 Each of the events occurred as a result of moisture accumulation in the sample piping and/or photohelic unit of the 1259 monitor oxygen analyzer. On 4-11-81, the monitor tripped as a result of moisture accumulation in the monitor sample lines that caused the analyzer sample pump to lose suction and trip. To return the monitor to service the same lines were blown down and the analyzer was satisfactorily checked for calibration. On 4-12-81, the monitor tripped due to detected lou sample flow that resulted from moisture accumulation in the analyzer photohelic unit. The excess accumulated moisture was removed and the photoholic was then allowed to dry prior to recalibrating it and returning the monitor to normal service.

On 4-13-81, the monitor again tripped due to moisture accumulation in the analyzer photohelic unit. In this case, however, an inspection of the photchelic unit revealed a defective photomultiplier tube that resulted from a moisture buildup. The photchelic containing the photo-multiplier tube was replaced, the analyzer was recalibrated, and the monitor was returned to normal service.

As presently designed, these monitors encounter significant moisture in their sample flow due to the sample piping configuration to the monitor. Due to a history of similar events involving moisture problems, a plant modification has been developed to replace these monitors with others of a more reliable derign.

The sample piping to these monitors will also be modified in hopes that the changes made to the piping config.uration will help eliminate the source of the moisture problems encountered by the r onitors.