ML19253B405

Update to LER 78-005/01x-1:on 780302,during Inservice Insp of Tubing,Five Tubes Exceeded Plugging Limit of 40% of Nominal Tube Wall Thickness.Caused by Oxiding Aqueous Corrosion Mechanism.Defective Tubes Plugged

ML19253B405
Person / Time
Site:	Arkansas Nuclear
Issue date:	10/09/1979
From:	Shively C ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19253B395	List: ML19253B394 ML19253B399 ML19253B405 ML19253B410
References
LER-78-005-01X, LER-78-5-1X, NUDOCS 7910150505
Download: ML19253B405 (1)

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UPDATE REPORT - Previous Report Date 3/24/78 N RC F O R M 366 C. S. NUCLE AR REGUL ATORY COMMISSION LICENSEE EVENT REPORT EXHIBIT A CONTROL BLOCK: l l l l l l6 }h i

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DOCar.ET Nu'J8 ER EVENT DESCRIPTION ANO PROBAOLE CONSEQUENCES h F67T1 i Durino inservice insoection of OTSG "A" tubino nor T.S _4_lR. five tubos I toi3i i had indications exceeding the pluggina limit of 40% of the nominal tube i lol41l wall thiclenoqq. Throp tuhpq are incatpd neyt tn t he "hl a nte lare" with  !

n s I the detect near the opper tube sheet. ine tube is located in the ceri- 1 o s 16herv. There was no RCS leakaae as none of the dpfnetivo tnhos worp I o i l 100% thru wall. There were no dpfective tuhp- identified in tF A 1977 I o e I inspectiorluand there have been no similar occur _rEnces. This occurrence I

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o 1Throo dpfpetivo tuhos . 75-I R . 78J7_ 77-17 (pnw e TubpM ; worn identified I tisijiin the required 3% inspection. An additional 6% were inspected oer '.S'. i

,, , i Table 18-2 & tubes 79-15 & 11-3 were identified as defective. An addi -

mI tional 12% were inspected. Tube 77-17 was removed. The defect was i Lu.J l analyzed as intercranular cracking, probably caused by an oxinizing or a i

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