05000321/LER-1981-080-03, /03L-0:on 810724,both Primary Containment dihydrogen-dioxide Analyzers Found to Be Reading Lower than Actual Concentration of Dioxide.Caused by Component Drift. Hays Analyzers Recalibr

/03L-0:on 810724,both Primary Containment dihydrogen-dioxide Analyzers Found to Be Reading Lower than Actual Concentration of Dioxide.Caused by Component Drift. Hays Analyzers Recalibr

ML20010C740
Person / Time
Site:	Hatch
Issue date:	08/11/1981
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010C739	List: 05000321/LER-1981-080, Forwards LER 81-080/03L-0 05000321/LER-1981-080-03, /03L-0:on 810724,both Primary Containment dihydrogen-dioxide Analyzers Found to Be Reading Lower than Actual Concentration of Dioxide.Caused by Component Drift. Hays Analyzers Recalibr
References
LER-81-080-03L, LER-81-80-3L, NUDOCS 8108200369
Download: ML20010C740 (2)

LER-1981-080, /03L-0:on 810724,both Primary Containment dihydrogen-dioxide Analyzers Found to Be Reading Lower than Actual Concentration of Dioxide.Caused by Component Drift. Hays Analyzers Recalibr

Event date:
Report date:
3211981080R03 - NRC Website

text

NRC FORM 366 U. S. NUCLE AR REGULATORY COMM115 TON (rm a

LICENSEE EVENT REPORT CONTROL 8 LOCK: l l

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t;0 61 DOCKE T NUMBER 68 6'3 EVENT DATE 14 75 REPORT DAT E 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h L_

while the plant was in steady state operation at 7424 MWt, both primary l

o 2 l 013 l l containment H2 - 02 analyzers were found to be reading lower than actual I

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concentrations of 02 Tech Specs 3.7. A.5.b requirement of <4% 02 con-1 10 l $ 1 I centration was not met.

Plant operation was placed in a 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> LCO. The l

l o 161 l health and safety of the public was not affected.

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l O 171 I event as last reported on Reportable Occurrence Report No. 50-321/1981-075.

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Analyzers were recalibrated:and returned to service.

N2 was added to 1

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reduce 02 content below 4%. The surveillance interval will be reduced from I

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once per 6 months to once per week until the reliability of these instru-l i 4 l

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I LER No.:

50-321/1931-080 Licensee: Georgia Power Company facility: Edwin I. Hatch Docket No.:.50-321

Narrative

Report for LEP. 50-321/1981-080.

On July 24, 1961, while the plant was in steady state operation at 2424 MWt, ooth primary containment H2 - 02 analyzers were found to be reading lower than actual concentrations of 0.

Tech Specs 3.7.A.5.b requirement of <4%

2 02 concentration was not met.

Plant operatior, was placed in a 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> LCO.

The health and safety of the public was not affected. This is a repetitive event as 'last reported on Reportable Occurrence Report No. 50-321/1981-080.

The cause of this event has been attributed to component drift. The Hays Analyzers were recalibrated and returned to service.

N2 was added to reduce 02 content below 4%. The unit is in full compliance with the requirements and no further reporting is required.

The surveillance interval will be reduced from once per 6 months to once per week until the reliability of these instruments improves. This type of analyzer is not used on Hatch Unit II.

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