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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2 18 corroslon rate was ements were taken i surements revealed no Siml 1ar measurements I

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concrete shield.

1 42 p rn 08-21-2006 3 /a e o f leakage was during t source of leakage that during the n t i t i e s of water leakage appears t o be ehlnd the drywell ductlon of water I n 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 indef 1nl t e

3 49 p rn 08-21-2006 4 /a 6099714651 TDR 854 Rev. 1 Page 26 he fact t h a t hlgh e torus room where the I flberglass boards e l ? steel whl ch I

I tact w i t h I t . In ental w i t h i n the arly as i n the late ulfate from the f leaving m o i s t i

hese steel surfaces as and with t i m e a l l protective oxtde corrosion process.

m d i d not resutt chlorlde. The actual I e frame from l n l t l a l

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

i1 gen embri ttlement on are generally mater la 1 as roc I ated welds and heat-affected would be expected onslstent with t h e I s assumed to have time water could enter

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s data Indlcates t h a t c&osion was extiemeiy measurements, Flrst, the region above the 11'9" elevation shoHs little or no wall loss. Then the reglon from 10'3" t o 11'9" shows the greatest wall loss followed by the reg '0'3" which shows substantla'ly less wall loss.

four bays show any slgnl xpl anatton for wetted. This disumptlbri 1s PO

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• s dry. Also, the fntfmacy of the contact

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Is a factor. d had been pushed

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'away from the drywell I n certd'n regions due 5 s ,, t i ' . , I .. * * ,. <

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priessure t e s t caus the b;.Sweii to' exdafid; I n the sand. The on of i t s integrity I ound to be incorporated

60997j14651 24 57 p rn 08-21-2006 7 18 TDR 854 Rev. 1 believed to have conclusion i s based on the results presented I n Section 3.5. Also, there 1s no d i r e c t ev process'as dl scussed In Sectlon 3.6. Therefore, the corrosion observed can be explained solely on the basis o f chemlcal attack.

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'high pH aqueous env!ronments or Dr, Uhl{g

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ambient temperature, seawater at approximately 1-7 mpy which a t 140'F I

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• 60997)14651 TDR 854 Rev. 1

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• If we then take the 17 mpy corrosion rate and pr his over t h e 17 year l i f e of the plant i t correlates closely with. the < . ,

average corrosion loss of 288 mils. However, tn order to Insure conservatlsm in the 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 a i l corroslon ter Intruston I n I

I 1980. T h i s would and give a factor j

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

concluslons were adequate.

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