ML19211A290

LER 79-097/03L-0:on 791128,after Recalibr of P33-P001A & B During Steady State Power Operation,Drywell Torus Dihydrogen & Dioxide Analyzers a & B Indicated More than 4% Oxygen Concentration.Caused by Leakage of Air Into Analyzer

ML19211A290
Person / Time
Site:	Hatch
Issue date:	12/11/1979
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19211A280	List: ML19211A278 ML19211A290
References
LER-79-097-03L-01, LER-79-97-3L-1, NUDOCS 7912170316
Download: ML19211A290 (2)

Text

NRC FORM 366 (7 77)

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DATE 7 8 60 6l NUMBER EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h lO l2l l Af ter re-calibration of P33-P001A and B during steady state power operation, it l IO lal l was observed that the Drywell-Torus H2 and 02 Analyzers "A zud B" were indicating l o 4 l greater than 4% oxygen concentration. The samples taken by lab instrumentation l o 5 l revealed that the oxygen concentration was 3%. There was no effect on the environs. l O c l This was a non-repetitive event. l O s l J i _

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44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i O l The cause of the occurrence has been attributed to air inlerkage to the annlyzers l i i j causing them to observe a higher than actual reading. The Eines were tested and l

, 7 l all identified leaks repaired. The analyzers were re-calitrated and returned l i 3 l to service. l 1 4 l 7 8 9 80 ST S  % POWER OTHER STATUS IS O RY DISQVERY DESCRIPTION NA Observation l1 l51lE @ 0l 9 l 8l@l l l B l@l l ACTIVITY CO TENT RELEASED OF RELE ASE AMOUNT OF ACTIVITY LOCA10N QF RELEASE 7

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1 NARRATIVE REPORT Georgia Power Company' Plant E. I. llatch Baxley, Georgia Reportable Occurrence Report No. 50-321/1979-097 Af ter re-calibration of P33-P001A and B during steady state power operation at 98% power, J t was observed that the drywell-torus H 022 analyzers "A and B" were indicating greater than 4% oxygen concentration. Actual drywell samples revealed the oxygen concentration was 3%. There was no affect on the environs. This was a non-repetitive event. The cause of the occurrence has been attributed to air inleakage to the analyzers causing them to observe a higher than actual reading. The lines were isolated and pressurized, several leaks in the panel were found and repaired. The analyzers were re-calibrated and returned to service. This problem is only applicable to Unit I because the Unit II drywell is. not inerted. The analyzers are not utilized on any other safety related system on either unit.

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