ML19208D434

LER 79-103/03L-0:on 790907,drywell Average Air Temp Rose to 145.8 F While Maint Personnel Were Adjusting Flow to Lower Drywell Temp.Temp Increase Caused by Suspected Steam Leak. Flow Increased to Reduce Drywell Average Temp

ML19208D434
Person / Time
Site:	Hatch
Issue date:	09/19/1979
From:	Baxley S GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19208D433	List: ML19208D432 ML19208D434
References
LER-79-103-03L, LER-79-103-3L, NUDOCS 7909280419
Download: ML19208D434 (2)

Text

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_ pi 1 [During norr.al power operation drywell average air temperature was increasing because j 19h] Lof a suspected steam leaW Phile mainten1nce oersonnel were adjusting flow the averareJ .

_ pgTG [ dry.tell temperature reached 145.8 degrees F. Systc a flow uns readjusted and tcmpera-  ;

, , . , .ggture was returned to T. S. 3.6.1.7. limits. _

The same condition occurred on 9-8-79 j g g (when chiller units were being swapped. This is a repetitive occurrence es noted in __j 73 g) L_ ,LER 79-81.

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[gg pooler 'o achieve leu il'.u at a lwer trmperature to louer drywell tgera ture. This j g gaused dryvtall ter perature to increeso to 145.8 degree F. Flow was readjusted to in- J g ;cycase flcw end reduce dry,iell averar.e temperature. On 9-8-79 plant perscnnel '..ere J

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9 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS _:

Drywell temperature First unit was restarted and returned to service.

Within two hours of the deviation the dryviell recched 145.75 degrees'F.

temperature was returned to within Technical Specification limits. Drywell entry on 9-9-79 confirmed that a steam leak existed in drywell on flange at 2B21-00ll. Leak was repaired vhile unit was down.

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