05000325/LER-1981-035-03, /03L-0:on 810315,core Auxiliary Monitor Oxygen analyzer,1-CAC-ATH-1259-2,indicated Upscale Concentration While Sampling Torus Atmosphere.Caused by Calibr Shift of Monitor Analyzer 1259 Due to Excessive Moisture

/03L-0:on 810315,core Auxiliary Monitor Oxygen analyzer,1-CAC-ATH-1259-2,indicated Upscale Concentration While Sampling Torus Atmosphere.Caused by Calibr Shift of Monitor Analyzer 1259 Due to Excessive Moisture

ML20003F193
Person / Time
Site:	Brunswick
Issue date:	04/13/1981
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20003F189	List: 05000325/LER-1981-035, Forwards LER 81-035/03L-0 05000325/LER-1981-035-03, /03L-0:on 810315,core Auxiliary Monitor Oxygen analyzer,1-CAC-ATH-1259-2,indicated Upscale Concentration While Sampling Torus Atmosphere.Caused by Calibr Shift of Monitor Analyzer 1259 Due to Excessive Moisture
References
LER-81-035-03L-01, LER-81-35-3L-1, NUDOCS 8104200377
Download: ML20003F193 (2)

LER-1981-035, /03L-0:on 810315,core Auxiliary Monitor Oxygen analyzer,1-CAC-ATH-1259-2,indicated Upscale Concentration While Sampling Torus Atmosphere.Caused by Calibr Shift of Monitor Analyzer 1259 Due to Excessive Moisture

Event date:
Report date:
3251981035R03 - NRC Website

text

U.S. NUCLEAR REGULATORY COMMISSION NRC FORM 366 8774 LICENSEE EVENT REPORT

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8 60 64 OOCKET Nuv8ER 68 69 EVENT DATE 74 75 AEPORT OATE 83 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h Iol2l lWhile venting the drywell to control pressure while inerting, CAC monitor orvcen analvder,

o y3i g -CAC-ATH-1259-2, indicated an upscale concentration while sampling the torus atmos-l l

lo,,,lphere.

The other CAC monitor oxygen analyzer. 1-CAC-ATH-1263-2, showed a normal torus I g l oxygen concentration following a momentarily upscale spike when the analyzer was selee-l l 0 I6 ] jted to monitor the torus. This event did not affect the health or safety of the l

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excessive moisture in the monitor torus sample lines. The moisture was removed from I

the sample lines, the analyzer was recalibrated, satisfactorily tested and returned to l y

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1.ER ATTACHMENT - RO #1-81-35 Facility: BSEP Unit No. 1 Event Date:

3-15-81 From the investigation of this event it was concluded that moisture buildup in the torus sample line to the CAC 1259 monitor occurred as a result of the present sample line. 'The sample line to the torus contains a " low point" in the line just as it exits the drywell. High moisture sample flow condenses in the line once it leaves the drywell and collects in this low point thus creating a low flow to the monitor. A partion of this condensate also enters the monitor which causes additional problems. The spike noted on the 1263 monitor when it was positioned to sample the torus was also caused by the moisture problem.

Due to a history of problems resulting from the CAC 02 and H2 monitors, a plant modification has been written to replace these monitors with others of a better design, and to correct the problem of low points in the sample lines.

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