ML20077S335

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Discusses B&W Commenting on Use of Furmanite in body-to-bonnet Joint of DHV-1,per Request.Reported Levels of Chlorides,Fluorides & Sulfur in Furmanite Used on DHV-1 Not Cause for Concern.Furmanite Can Be Left in Place
ML20077S335
Person / Time
Site: 05000000, Crane
Issue date: 04/15/1977
From: Gorman J
MPR ASSOCIATES, INC.
To: Stewart Bailey
METROPOLITAN EDISON CO.
Shared Package
ML20077S281 List:
References
FOIA-83-349 NUDOCS 8309220024
Download: ML20077S335 (3)
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Subject:

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.Use of Furmanite in DH-V1

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Dear Mr. Bailey:

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J ' You asked that'MPit. review a B&W Ietter da,ted. March 2'9, 1977, which contains B&W's comments regarding the' use of Furmanite in the Isody-to-bonnet joint of DH-V1. Furmanite was injected',into the body-to-bonnet. :..

joint of DH-V1 in November 1976 to stop a small l' ak, and we understand e

IvretEd would like to leave it in place.for at least another year,*and possibly longer.

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The B&W 1etter reports the results of their chemi' cal'analydes of Furmanite 'as 'follows:

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2 Leachable Impurities:

3.8 # g C1 /in a

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- l 2.6 p g 7lin Total Impurities:

  • 34. 3 ppm C1
7.1 ppm F

.,,. l.. ; '.. )e 1,100 ppm S "In regard to chloride content,..the B&W 1etter states that'it i' '

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well within specified limits for materials in contact with reactor coolant, but'-

recommends that evaluation be made of the' environment in the local use area. I

  • As we discussed at the November 5,1976, meeting at Meted,' MPR considers that the use of Furmanite in the body-to-bonnet joint of DH-V1 is not a severe application since (i) temperatures are low,.about 250 F maximum, (ii) the du-plex austenitic-ferritic solution annealed cast stainless steel used for the valve i

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.. body and bonnet would be quite resistant to stress ^ corrosion cracking even if,-

chlorides and f1w. rides were present, and (iii) the reported chloride vaiues in'

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..j the Furmanite are well below those of elastomers whicli have had extensive "

successful use' in similar applications. Accordingly, we consider the chloride

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and fluoride levels indicated by the B&W analyses to be acceptable for extendeq

,.;c use of Furmanite in DH-V1.

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3 In regard to sulfur content, B&W states' that it is relatively high.1

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and recommends that the high sulfur content.be evaluated when considering the continued use of Furmanite. B &W indicates' that. sulfur c;ontamination' ca.n <

result in intergranular corrosion of high nickel alloys and au'stenitic s'tainless' l

steels, particularly in the sensitized condition,. and that this occurs with nen-tral or acidic pH and temperaturss,below 3000F (e_ g.,' due to.'polythionic acid)c B&W notes that the. potential for intergranular attack of ausi:e'nitic stainless,,.

7, steel is diminished if the material is in the solutioh annealed condition.

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MPR comments in regard to the sulfur content in F an' a:

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u The Furmanite in the; body 'to-bonnet. Joint of DE-V1 ~is essentially E gas l'.

ket of nitrile rubber,. based on information provided Meted by the Fur-1,. s similar. to many.othez i

l manite Company.

Thus, the Furmanite in DH-nitrile rubber gaskets widely and successfully used in similar applications in stainidss steel systems.

For example, WAPD-TM-432 dated July 1964

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" Thermal Stability Evaluation of Elastomeric Materials, " indicates that.

nitrile rubbers with sulfur contents,as high as 10,000 ppm (one percent).

l are acceptable for continuous use up to temperatures o,f 250 F. We con-. -

sider that the wide successful use of nitrile rubbers (vith as high or highei l

sulfur contents thEn in Furmanite provides good confidence that Furmanite will not cause a problem in DH-V1.

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l We understand that Meted has confirmed by discussions with the v'alve 2.

supplier (Walworth) that the cast stainless steel body and bonnet and the nickel gasket of DH-V1 were solution annealed,.and are not in the s' nsi 1

e tized condition. 'As reported in " Stress Corrosi,on Cracking Susceptibility of Stainless Steels and Nickel-Base Alloys in Polythionic Acids anti Acid 1 -

Copper Sulfate Solution," by C. H. Samans, Corrosion, Volume 20, Page 256t, tests. have,'shown that solution annealed material'is resistant to polythionic acid attack. Accordingly,'the possibility of any significs'nt!

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- intergranular attack of DH-V1 due to the reported sulfur content should, !

1 be minimal..

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l In summary, we consider that the. reported levels of chlorides,'

' fluorides and sulfur.in the Furmanite used on DH-VI are not cause for conce and that the Furmanite can be left in place in the valve for an;ex ended,perlok t

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April 15, 1977.;;.14 a

...c If you have any questions, please do not hes'itate to contact us.*

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