ML070600230

Amergen Fax with Results of 1986 Core Bore Sample Analyses

ML070600230
Person / Time
Site:	Oyster Creek
Issue date:	08/21/2006
From:	Tamburro P AmerGen Energy Co
To:	O'Hara T NRC/RGN-I/DRS/PSB2
References
Download: ML070600230 (8)

Text

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corroslon rate was ements were taken i

surements revealed no Siml 1 ar measurements I

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I concrete shield.

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3 /a 1 42 p rn 08-21-2006 e of leakage was during t source of leakage that during the n t i ties of water leakage appears t o be ehlnd the drywell ductlon of water In 1980, 1983 and lum, and sulfate along h conflrms the t t l e s whlch would sand bed to f 1 ow out of alrly enclosed with x l s t i n the annular or i ndef 1 nl t e

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TDR 854 Rev. 1 Page 26 he fact that hlgh e torus room where the flberglass boards el? steel whl ch I I tact with I t.

In ental within the arly as i n the late ulfate from the f leaving m o i s t i

I hese steel surfaces as and with time all protective oxtde corrosion process.

m did not resutt chlorlde. The actual e frame from l n l t l a l

5 18 02 24 13 p rn 08-21 -2006 refuel 1 ng water and ce af the water was therefore be properly Ing quality water y of chlortdes s data presented I n but it Is consldered n i 1 !

gen embri ttlement on are generally mater la 1 as roc I ated welds and heat-affected would be expected onslstent with the I s assumed to have time water could enter

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s data Indlcates that c&osion was extiemeiy I

measurements, Flrst, the region above the 11'9" elevation shoHs little or no wall loss. Then the reglon from 10'3" to 11'9" shows the greatest wall loss followed by the reg less wall loss.

four bays show any slgnl

'0'3" which shows substantla'ly xpl anatton for wetted.

This disumptlbri 1s PO

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Also, the fntfmacy of the contact

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'away from the drywell In certd'n regions due priessure t e s t caus the b;.Sweii to' exdafid; I n the sand. The on of i t s integrity ound to be incorporated

7 18 24 57 p rn 08-21-2006 60997j14651 TDR 854 Rev. 1 believed to have conclusion i s based on the results presented In Section 3.5.

Also, there process'as dl scussed In Sectlon 3.6.

Therefore, the corrosion observed can be explained solely on the basis of chemlcal attack.

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'high pH aqueous env!ronments or Dr, Uhl{g i n hls I'cdrroston Ha, ambient temperature, seawater at approximately 1-7 mpy which at 140'F

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• 60997)14651 TDR 854 Rev. 1

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3 If we then take the 17 mpy corrosion rate and pr year l i f e of the plant it correlates closely with the average corrosion loss of 288 mils. However, tn order to Insure conservatlsm in the his over the 17 structural analysts a factor 07 safety should be applled to t h i s rate.

To arrlve at a defendable factor i t has been assumed that ail corroslon ter Intruston I n and give a factor I

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This would j

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tes we predicted d as Appendix C) resulted i n concl us ns that our sampling L appr concluslons were adequate.

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