ML103060473

Lr - Draft RAI Set 32

ML103060473
Person / Time
Site:	Diablo Canyon
Issue date:	11/02/2010
From:	Office of Nuclear Reactor Regulation
To:	Division of License Renewal
References
Download: ML103060473 (3)

Text

DiabloCanyonNPEm Resource From: Ferrer, Nathaniel Sent: Tuesday, November 02, 2010 3:50 PM To: Grebel, Terence Cc: DiabloCanyonNPEm Resource

Subject:

Draft RAI Set 32 Attachments: Draft RAI Set 32 AMP follow-ups.doc

Terry, Attached is Draft RAI Set 32 containing draft RAIs, specifically on portions of aging management programs.

Please review the attached draft RAIs and let me know if and when you would like to have a teleconference call. The purpose of the call will be to obtain clarification on the staff's request.

Please let me know if you have any questions.

Nathaniel Ferrer Project Manager Division of License Renewal Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission (301)4151045 1

Hearing Identifier: DiabloCanyon_LicenseRenewal_NonPublic Email Number: 2060 Mail Envelope Properties (26E42474DB238C408C94990815A02F091362C70260)

Subject:

Draft RAI Set 32 Sent Date: 11/2/2010 3:49:55 PM Received Date: 11/2/2010 3:49:56 PM From: Ferrer, Nathaniel Created By: Nathaniel.Ferrer@nrc.gov Recipients:

"DiabloCanyonNPEm Resource" <DiabloCanyonNPEm.Resource@nrc.gov>

Tracking Status: None "Grebel, Terence" <TLG1@pge.com>

Tracking Status: None Post Office: HQCLSTR01.nrc.gov Files Size Date & Time MESSAGE 549 11/2/2010 3:49:56 PM Draft RAI Set 32 AMP follow-ups.doc 59898 Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:

Recipients Received:

Diablo Canyon Nuclear Power Plant, Units 1 and 2 (DCPP)

License Renewal Application (LRA)

Draft Request for Additional Information Set 32 Aging Management Program RAI B2.1.9 (follow-up)

Background

By letter dated August 26, 2010, the staff issued RAI B2.1.9, requesting that the applicant provide additional information on how cracking in titanium components will be managed by the Open-Cycle Cooling Water System Program and if visual inspection will be used. The staff also requested details on how the visual inspection will be implemented to take into consideration the tightness of cracks that can form in titanium. In its response dated September 22, 2010, the applicant stated that it would revise the External Surface Monitoring Program to include visual inspections to detect cracking and leakage of titanium tubing. The applicants response did not provide details, as requested in the RAI, on what visual inspection techniques would be implemented to identify the tight cracks (e.g., VT-1, VT-2, VT-3).

Issue Given that the applicant did not provide the requested detail in its response to RAI B2.1.9, the staff does not know what visual examination method will be used and therefore cannot evaluate the effectiveness of this method in detecting tight cracks that may form in titanium.

Request State what type of visual inspection technique will be used in the External Surface Monitoring Program to detect cracks in titanium prior to failure (i.e., leakage).