05000324/LER-1981-036-03, /03L-0:on 810225 & 0303,during Normal Reactor Startup,Primary Containment Oxygen Analyzer Had Upscale & Downscale Indications of Drywell & Torus Oxygen Concentration.Caused by Moisture in Electromagnetic Unit

/03L-0:on 810225 & 0303,during Normal Reactor Startup,Primary Containment Oxygen Analyzer Had Upscale & Downscale Indications of Drywell & Torus Oxygen Concentration.Caused by Moisture in Electromagnetic Unit

ML19350C685
Person / Time
Site:	Brunswick
Issue date:	03/27/1981
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19350C684	List: 05000324/LER-1981-036, Forwards LER 81-036/03L-0 05000324/LER-1981-036-03, /03L-0:on 810225 & 0303,during Normal Reactor Startup,Primary Containment Oxygen Analyzer Had Upscale & Downscale Indications of Drywell & Torus Oxygen Concentration.Caused by Moisture in Electromagnetic Unit
References
LER-81-036-03L, LER-81-36-3L, NUDOCS 8104060598
Download: ML19350C685 (2)

LER-1981-036, /03L-0:on 810225 & 0303,during Normal Reactor Startup,Primary Containment Oxygen Analyzer Had Upscale & Downscale Indications of Drywell & Torus Oxygen Concentration.Caused by Moisture in Electromagnetic Unit

Event date:
Report date:
3241981036R03 - NRC Website

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CRC FW4966 U. S. NUCLEAR REGULATORY COMMISSloN a.m LICENSEE EVENT REPORT hTROLetOcicl l

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mEPCR T OLTE 80 EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h Io12l l During a normal reactor startup, prie:ary containment oxygen analyzer, 2-CAC-AQH-1263-2 4 was observed with an upscale indication of the drywell and torus oxygen concentration l

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,,,,, ;while the other oxygen analyzer, 2-CAC-AQH-1259-2 indicated an expected concentration l g ;of <4%.

On March 3, 1981, the 1263-2 analyzer was found with downscale indications

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g ;of the drywell and torus oxygen concentration. Neither of these events affect the 1

go,7g g ealth or safety of the public.

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- Facility: BSEP Unit No. 2 Event Date: 2-25-81 Moisture buildup in the analyzer sample lines caused both of these events. As presently installed, this type CAC monitor utilizes sample piping that tends to allow a moisture buildup in the monitor components and within the line itself.

In both events, the monitor oxygen analyzer electromagnetic unit experienced an instrument zero reference shif t due to a change in pressure resulting from a moisture buildup in the analyzer piping with the resultant upscale and downscale indications exhibited by the analyzers. The sample lines to these monitor analyzers are presently blown down on a weekly basis to remove any moisture accumulation that could lead to problems affecting the operation of these monitors.

. Due to a history of various events resulting from sample flow moisture problems, a plant. modification has been developed to replace these type monitors with others of a more reliable design that will utilize a different sa=ple piping design which will help eliminate any moisture buildup problems. The monitors presently in use will be replaced with the others specified in the modification, following their receipt, during the next unit outage of suf ficient length as to allow their. installation. They are currently scheduled to arrive on site in August 1981.

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