ML20206G435

SER Supporting Employee Concern Element Rept Co 11101-SQN, Contact Between Dissimilar Metals

ML20206G435
Person / Time
Site:	Sequoyah
Issue date:	11/04/1988
From:	NRC OFFICE OF SPECIAL PROJECTS
To:
Shared Package
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References
NUDOCS 8811220278
Download: ML20206G435 (2)

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UNITED STATES

'i NUCLE AR REGULATORY COMMISSION j k /l i

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1 i-i SAFET) EtALUATION REFORT BY THE OFFICE OF SPECIAL PROJECTS l

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EMPLOYEE CONCERN ELEMENT REPORT CO 11101-50N.

l "COMTACT BETWEEto 0155tH1'.AR f4ETALS",

TEt.f ESSEE VALLEY AUTH0F:!TY f

SEQUOYAH h0 CLEAR POLCR PLANT UNITS 1 A 2 l

DOCKET N05. 50-327 AND 50-328 l

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l Categcry: Construction (1C000)

Sutcatescry:

Hangers /Suptcrts (11100) 4 F.lerent: Coritect Between bissimilar Paterials (11101) j TMs basis fer Elerent Peport C011101-50N, Rev. 3, dated October 31,195E is Setuojah-s cific te;1oyee Concern XX-85-038-001 which states:

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'Sequoya h:

1976 Stainless steel pipe permitted to contact carbon steel i

structural steel with no stainless steel innert ("shim"); if the j

structural steel is ;eirted with a particular p int that prevents

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detical reaction. This paint can te ruebed off your hand and is f

thrcu;hout the plant."

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This corcern was evaluated by TVA as potentially nuclear safety-related.

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j II. Surrarv of Issue l

Tre paict usec to separate carbon steel supports fro:n stainless steel pipe

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will wetr through and allow the carbon steel to come into direct contact with t

the stainless steel. The NRC staff concluded that the reed and requireinents for shirs cr paint should be part c' the issue.

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!!I Evaluation The TiA esalvators reviewed decurentation, including the Quality Technology I

d (crpany Iraesticatter Report for ir.ployee Concern XX-65 038 001. They l

J performed a walkdown of various areas in the Sequoyah Auxiliary Building to j

i observe examples of the use of paint between stainless steel pipe and carbon f

steel pipe supports, i

Th Ele ert Re;crt noted discrepancies in the Secueyah procedures relatirs to r *cci au tity teing currected. Tre re; ort

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t??t tre.h u snira or port to separate statnitf 5 steel frcn, caroon s t e t t;.

l fitti at te ;t;ratures less tr.an 5W T esteeds current incustry standarcs.

f Trere#cre, no technical probler;i;aists anc ne corrective action is recuired.

I 8811220270 891184 7

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Ccrclusions it.t fJC staf f fo',r.c that the TVA investigation and resolution of the concern as cescribed in Eler.ent Report C011101-SQtt, Rev. 3, is adequate.

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