05000324/LER-1981-050-03, /03L-0:on 810613,during Routine Surveillance, Primary Containment Atmosphere Monitor Oxygen Analyzer 2-CAC-ATH-1259-2 Was Showing Erratic Indications of Drywell & Suppression Pool Oxygen Concentrations.Caused by Bad Tube

/03L-0:on 810613,during Routine Surveillance, Primary Containment Atmosphere Monitor Oxygen Analyzer 2-CAC-ATH-1259-2 Was Showing Erratic Indications of Drywell & Suppression Pool Oxygen Concentrations.Caused by Bad Tube

ML20005A323
Person / Time
Site:	Brunswick
Issue date:	06/25/1981
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20005A318	List: 05000324/LER-1981-050, Forwards LER 81-050/03L-0 05000324/LER-1981-050-03, /03L-0:on 810613,during Routine Surveillance, Primary Containment Atmosphere Monitor Oxygen Analyzer 2-CAC-ATH-1259-2 Was Showing Erratic Indications of Drywell & Suppression Pool Oxygen Concentrations.Caused by Bad Tube
References
LER-81-050-03L, LER-81-50-3L, NUDOCS 8106300189
Download: ML20005A323 (1)

LER-1981-050, /03L-0:on 810613,during Routine Surveillance, Primary Containment Atmosphere Monitor Oxygen Analyzer 2-CAC-ATH-1259-2 Was Showing Erratic Indications of Drywell & Suppression Pool Oxygen Concentrations.Caused by Bad Tube

Event date:
Report date:
3241981050R03 - NRC Website

text

A LICENSEE EVENT REPORT CONTROL BLOCK:

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60 68 OOCKET NUMSER 64 63 EVENT DATE 14 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h ITITl l During routine surveillance, it was observed that primary containment atmosphere l

ITTTl I a nitor oxygen analyzer, 2-CAC-ATH-1259-2, Model No. F3, was showing erratic indica-1 ITI7l l tions of drywell and suppression pool oxygen concentrations. The actual concentra-l loIs] I tions were normal as indicated by the other primary containment atmospheric monitor l

171T1 l oxygen analyzer, 2-CAC-ATH-1263-2.

This event did not affect the health and safety lTITl I of the public.

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33 34 J5 36 31 40 el 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l i 101 l A had impedance matching tube in the monitor first stage amplifier circuit caused the l L' L'J l crratic indications. This tube, Model No. 6AK6, was replaced and the monitor was m i recalibrated and returned to service.

As no previot.a impedance matching tube failures l g i have occurred and there is no apparent reason for failure other than aging, this is l

l'iT41 I considered an isolated event.

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