ML20071A939

Corrected 830125 Testimony of Wh Spataro,Pp 6,551-53 & 6,559

ML20071A939
Person / Time
Site:	Indian Point
Issue date:	02/23/1983
From:	Spataro W POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:
Shared Package
ML20071A933	List: ML20071A931 ML20071A939
References
NUDOCS 8302250240
Download: ML20071A939 (4)

Text

K 1

melibdinua alloys, the description of.the alloys

. l 2 suggests that they are something pretty close to I i

3 stainles steel. Is that right?.

l 4 EITNESS SPATAR0s 'No, that is wrong. The  :

l 5 reason I changed it to a fami17. is that we used -a number 6 of. different alloys of the same family type in order to S 7 make our annufacturing. If.I can. elaborate on that just 8 a -little, the coolers themselves are made of an allor G called A16I. .It is A11eglieny Ludlum.'s allor. It has 6 molybdenum . .

10 percent 3MfSIMBElifdiF. It gives the.maziana resistance to

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11 pitting corrosion.. -

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- Novever,.that alloy cannotsbezaadenin large

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molybdenum

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13-;-sheet. or.: piping :formebecauseioff thelhigh0@-

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[ y The.: vater boxesuof"thejfinfcShikr;. sFand'  ; .a . the

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.14 content. ,

15: attendant piping are made of' ani allor calledialloy' 20

,. Cabot is aodified, manufactured by :Catimen:. Corporation ~. - Thi's -

. use

.'1Tg alloy is approved:.'.for-nuar by the:.'ASHE" Boiler. and Pressure 18'. -Yessel Code. ,

19 The rast of~the piping: system,'however, is 20 unde of an alloy called 904L. Both 904L and alloy 20

21. mod harre approximately 3 an'd: a half to 4 percent molybdenum 22 .emmersterm in them. Th,e reason for~904t, which is Uddeholm 23 manufactured by the 325t!Hmh Corporation in Sweden, and 24 by Inco here in the United States, was the relative 25 availability of the' material in large quantities, such [

ALDE4SoM REPoRTUNB COMPANY. INC.

400 VWIGINIA AVa. S.W WASHINeToN. D.C. 20024 GOD 584 2346 8302250240 830223 PDR ADOCK 05000247 C y pDR . _ . _ ._ _ ;

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1 as elbows, tees, straight runs, or piping.

cabot  !

2 He could not get the TEIRi5Bt alloy in large  !

3 quantities quickly enough to put our systems in, so we l

- 4 changed over to a very similar, alloy, and that is the 5 reason why I mentioned them as a fasily of alloys. -

6 Your basic question- was whether or not- ther -

7 were equivalent to stainless steel. As I understand you 8 toc mean stainless steel, this would: be the straight ~ 18 9 chrone,~8.. nickel alloys. The- a'nswer would be no,-

10 because 'these have an appreciably. large amount of-11 nickel, of the' range of at least 23- to 28 percent. The 12 ' chromium isecomparable, if slightly higher.

molybdentus A y 13 However., the N ..conten.t. coupled: with i

s b.

I 44' the-'nidkeljis' what giver usioub pitting. corros'idni

- '15 . resistNace.'.~ . .

16 JUDGE SHONa. I guess the way in which I 17 thought they might be'similar to stainless is,.are ther 18 or are ther not sub.iect to -intedgranular, stress 19 corrosion cracking when-exposed tio aqueous solutions of I

20 chloride ion? That is the reputation of stainless

21. steel.

22 WITNESS SPATAROs- No, they are not. If I may 23 elaborate, stainless steels-have that problee due to 24 something which we call sensitization. The carbon

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25 content in the stainless steel during velding and heat A

l ALDWe0N REPOlmMG COMPANY. INC, 400 VIRGINIA AVE., S.W. WASHINGTON. O.C. 20034 (203 854-2348 l

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6553 1 treating operations migrates to the grain boundaries,

..g 2 where it then ties up with chromium in the neighboring 3 grainc . ~

4 4 This leads to a depletion of the neighboring 5 grains from the chromium ' content. When that chromina 6 content drops below 11 and a' half percent, 7 approximately, the alloy becomes l'ess: than stainless, if~

8' I can use that ters, and is subject to the intergranular 9 attack', chloride-ions being the most prevalont. ions

. to which'can then break down th's chromium oxide-layers on 11 the surfaca of the stain 1'ss e steel', ani attack these, 12 depleted. areas. . ..

molybdenen 13 . The - user of -highC.nicke.'ic 'and high:3paamamiMsla 7,. ~

-' ~

-e

.J. . ., ~ 1 _ d 14- allars prevents this particulsr de' gradation >ofS.the-b ', -

occurring 15 materfil during fah.tication.from W Hence, we '

16, do not feel that ve. shouldc have 'any-: intergranular attack 17 during the .operatton or. lif,etime- of the.: allors.

18 JUDGE ~~SHOKi iThan ;yout Tnatevas. going to be~

( 19 af next question,whetner thir could have been 20 sensitized in any way during' the process. 1 21 WITNESS SPATAHOs' No.

22 JUDGE SHONa No. With resc::d to the portions 23 of the system 9hich originally were cement lined mild 24 steel, have these . portions been ~ inspected and 4

l 25 protected? Hr. Rothstein told 6s that in the other

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ALDWISoM REPORTING ColdPANY. INC, 400 VWie5NA AVE. S.W., WASHINGTON. D.C. 20024 (203 6844'146

. 6559

/ 1 JU ~)CE P ARIS : What causes the oxygen depletion 2 under the silt? Is the metal oxidizing, or what?

3 WITNESS SP ATARO: The anerobic bacteria , ai; I

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4 understand, are sulfate producing or sulfate reducing.

5 This sulfate combines with the copper oxide, which is 8 the na' i n passive protection for the copper alloys. It -

7 change's this to copper. sulfate.. The copper sulfate then cathodic ,

8 becomes artstrussau with respect to the remaining copper 9 oxide. -

10 This reaction reduces the amount of -- well, 11 actually, increases the amount of oxygen necessary to 12 keep the protection of the allor* consistent. Once I 13 have depleted the oxygen under the silt, because it.

1 14 cannot be replenished from the flowing water above the is silt level, I then do not have any more protection for 18 ar copper alloy, meaning I do not have any more copper 17 oxide, or in various patches I do not.

18 This small cell, if.we can call it that, 19 causes the pitting reaction "to proceed such that I 20 continue to break dov.n the copper oxide until I get to 21 the virgin material underneath. Once I do that, the 22 pitting proceeds at some corrosion rate..

23 JUDGE PARIS: Okar. I think that is the kind 24 of detail we need. Thank you. . .

25 JUDGE G1EASON4 All r'ight, gentlemen. The *

-s ALDER 8oN REPORTING COMPANY. INC.

M30 VIRGINIA AVE. S.W. WASHINGTON. D.C. 20034 (203 584-2348

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