ML040770135

Draft Information Input Response to RAI Alloy 800 Attachment 3

ML040770135
Person / Time
Site:	Comanche Peak
Issue date:	02/05/2004
From:	Thadani M Office of Nuclear Regulatory Research
To:	Hicks J, Terrell J NRC/NRR/DE/EMCB, TXU Electric
Thadani M, NRR/DLPM, 415-1476
Shared Package
ML040830346	List: ML040770122 ML040770130 ML040770135 ML040770141 ML040770147 ML040770152 ML040770155 ML040770163 ML040770168 ML040770177 ML040770190 ML040770210 ML040830326
References
Download: ML040770135 (2)

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Mail Envelope Properties (40226234.549:15: 21310)

Subject:

YOUR RESPONSE TO RAI RE: ALLOY 800 Creation Date: 2/5/04 10:33AM From: Mohan Thadani Created By: MCT@nrc.gov Recipients Action Date & Time txu.com Transferred 02/05/04 10:33AM jhicksl (Internet:jhicksl@txu.com) nrc.gov owf2_po.OWFNDO Delivered 02/05/04 10:33AM JBT CC (Joseph Terrell)

Post Office Delivered Route txu.com Internet owf2_po.OWFNDO 02/05/04 10:33AM nrc.gov Files Size Date & Time MESSAGE 2770 02/05/04 10:33AM Options Auto Delete: No Expiration Date: None Notify Recipients: Yes Priority: High Reply Requested: No Return Notification: None Concealed

Subject:

No Security: Standard To Be Delivered: Immediate Status Tracking: Delivered & Opened

,'i I nayali - TUUM- MhrUI'JbNt: uJ MI-s ht-: ALLU Y UUU Page 1 From: Mohan Thadani To: Internet:jhicksl @txu.com Date: 215/04 10:33AM

Subject:

YOUR RESPONSE TO RAI RE: ALLOY 800 Jack:

Inyour response to NRC staff Question 9 in your letter dated January 8,2004, it was stated that the qualification program Included sixteen sleeve/tube assemblies with laboratory-grown stress corrosion cracks.

A. Discuss whether any of these laboratory-grown stress corrosion cracks were situated in the portion of the tube that is adjacent to (i.e., behind) the sleeve's nickel band.

B. If some of the cracks were situated behind the nickel band, (1)discuss the size and location of these cracks (i.e., were some of the cracks situated in a manner that would require the eddy current signal to pass through the nickel band in order for the cracks to be detected); (2) discuss the orientation of the cracks (e.g., axial, circumferential, etc.); (3)discuss the effectiveness of the eddy current inspection method in detecting these cracks, and (4)if the eddy current technique is not effective at detecting these cracks, discuss which method will be used for this inspection and the technical basis for this method.

C. If some of the cracks were situated behind the nickel band, provide a methodology (and technical basis) for addressing the structural and leakage integrity for the sleeve/tube assembly, assuming that degradation (e.g., a 3600, 100% through-wall circumferential flaw) could be occurring in the portion of the tube that is adjacent to (i.e., behind) the sleeve's nickel band.

If you have any questions, please contact me.

Mohan (301) 415-1476 MCT@ nrc.Qov CC: Joseph Terrell