ML20079F899

Response to 831223 Interrogatories Re Steam Generator Tube Repairs

ML20079F899
Person / Time
Site:	Three Mile Island
Issue date:	01/16/1984
From:	Aamodt N, Jun Lee AAMODTS
To:	NRC OFFICE OF THE EXECUTIVE LEGAL DIRECTOR (OELD)
Shared Package
ML20079F903	List: ML20079F899 ML20079F908 ML20079F911 ML20079F917
References
NUDOCS 8401190336
Download: ML20079F899 (2)

Text

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UNITED STATES OF AhERICA NUCLEAR REULMORY COPJ:ISSION BIFORE THE ATOMIC SAFETY AND LICESING B0iRD' 00CKETED USNRC In the Fatter of KETROPOLITAN EDISCN COMPANY 84 MN 18 Ai0S2' Docket 50-289 (THREE MILE ISLAND NUCLEAR Stean Generator-Tube- Ee rs GENERATING STATIN, UNIT 1) . . .

LEE DI AL.. RESPONSES TO STAFF IhTERROGATORIE (12/23/83)

1. ' IGA and IGSCC can be initiated.

2. We believe we can only know the answer to this after the results of the cleaning process are fully deterzined by measurements taken on the OTSG piping and throughout the RCS.

3. a. IGSCC was found in areas of most severe ICA. See SER Att. 3 Pg. 2,#2.,

" severe cracking is usually related to more severe IGA.'"

4 Yes, Possibly. Definition of inadequacies and their re-edies can only be defined on the basis of experimental work which clearly defines the

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' conditions which cause IGSCC initiation in IGA islands and demonstrates i

the effects of those parameters which influence the length of time required

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to initiate ICSCC and subsequent thru-wall cracks. .

5. a. - Low valence Carbon

- Heretofore unidentified or unevaluated agents

- Sulfur contaninants in the Inconel 600

- Heretofore unidentified synergists

b. IGSCC, thru-wall cracks e - Failure of licensee to conduct an in-depth search for agents .

other than low valence sulfur. ,

- SER, Tcird Party Review 2/18/83 Pg. 9, Reconnendation #1 "Carb'onates in the presence of exidants at high tenperature can produce IGA of IGSCC of Inconel 600." c.j

- Failure of Licensee to conduct any evaluatinn/ possible synergistic effects with contaminants present in the water,

d. - IGSCC and thru-wall cracks could occur and nobody knows how cr when.

e. - Kobody knows but should be experimentally determined. -

f. - We don't know, and apparently Licensee does not either.

g. - We don't know. Their presence rust be confirmed cr denied experimentally.

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h. - Possibly. Experimental verification is required.

6. Yes, possibly, in that the universe of potential cracking agents has not been defined. It must be defined. . .

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Jane e

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A 'dAMbv1 i_ btw?h Norman O. Aamodt .

January 16,19%

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