ML12034A226

Lr - 9 16 2011 Teleconference Davis Besse

ML12034A226
Person / Time
Site:	Davis Besse
Issue date:	02/03/2012
From:	Office of Nuclear Reactor Regulation
To:	Division of License Renewal
References
Download: ML12034A226 (3)

Text

Davis-BesseNPEm Resource From: CuadradoDeJesus, Samuel Sent: Friday, February 03, 2012 3:58 PM To: Davis-BesseNPEm Resource

Subject:

9 16 2011 teleconference davis besse Attachments: 9 16 2011 teleconference DB.pdf 1

Hearing Identifier: Davis_BesseLicenseRenewal_Saf_NonPublic Email Number: 3220 Mail Envelope Properties (0046140293E11F408991442DB4FE25CA68D433E6F2)

Subject:

9 16 2011 teleconference davis besse Sent Date: 2/3/2012 3:58:23 PM Received Date: 2/3/2012 3:58:18 PM From: CuadradoDeJesus, Samuel Created By: Samuel.CuadradoDeJesus@nrc.gov Recipients:

"Davis-BesseNPEm Resource" <Davis-BesseNPEm.Resource@nrc.gov>

Tracking Status: None Post Office: HQCLSTR01.nrc.gov Files Size Date & Time MESSAGE 3 2/3/2012 3:58:18 PM 9 16 2011 teleconference DB.pdf 101870 Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:

Recipients Received:

Davis-BesseHearingFile Resource

Subject:

Davis Besse Teleconference on RAI 4.1-2 (8/17/2011 response)

Location: HQ-OWFN-11B06-12p Start: Fri 9/16/2011 11:00 AM End: Fri 9/16/2011 12:00 PM Show Time As: Tentative Recurrence: (none)

Meeting Status: Not yet responded Organizer: CuadradoDeJesus, Samuel Required Attendees: Hiser, Allen; Ng, Ching; dorts@firstenergycorp.com; Davis-BesseHearingFile Resource; Sheikh, Abdul; Lehman, Bryce Importance: High Phone: 888-843-9979 Passcode: 21445 Topics:

• RAI 4.1-2 regarding Code Case N-481 (8/17/2011 response letter)

In its response dated Aug 17, 2011, the applicant stated that the fracture toughness of the cast austenitic stainless steel is not time dependent as the analysis used a lower bound fracture toughness of 139 ksiin that bounds the saturated fracture toughness of the Davis-Besse material. The staff concern is that the applicants basis may be predicated on charpy or thermal aging data that are not up to date or conservative when compared to the most recent data for the state of the industry.

It is not clear to the staff whether the assumption that the lower bound fracture toughness of 139 and bounds the saturated fracture toughness of the applicants materials remains valid.

• RAI B.2.22-7 (8/17/2011 response) 1