ML20005A424

LER 80-040/01T-0:on 801226,removable Instrument Assembly 40 Count Rate Increased,Apparently Due to Leak in once-through Steam Generator Tube.Caused by High Cycle Fatigue.Tube Replaced.Leak Procedure Implemented

ML20005A424
Person / Time
Site:	Oconee
Issue date:	03/10/1981
From:	Jackie Jones DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20005A421	List: ML20005A420 ML20005A424
References
LER-80-040-01T, LER-80-40-1T, NUDOCS 8106300311
Download: ML20005A424 (1)

Text

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M i on December 26, 1980, the RIA-40 count rata increased apparently because of g ITiT1 l an OTSG tube leak. The unit was operated with the leak until February 8, 1981.,

io 1 1 I i $-@b l a rov ennducted on Februarv 11. 1981, found tube 78-2 to have a throuch E I v,11 teidication. Nocontaminatedliquidsbeyond10CFR20jimitswerere-  ;

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lo irl 1 timits. Fience, the health and safety of the public were not affected. ,

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CAuss t(SC.9 PTICN AMC CoMM(c"nVE AC"1Cr43 rf g i Tha robe leak was nossibly caused by high cycle fatigue. Upon discovering ,

WI the leak a procedure, " Control of Secondary Side Contamination" was implementeq d i Unit reactor power was reduced to keep leakaze rate below 0.20 gpm. The lane  ;

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