ML083231016

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E-mail from J. Hufnagel, Exelon to D. Ashley, NRR Draft-Summary of Telecom
ML083231016
Person / Time
Site: Oyster Creek
Issue date: 04/11/2008
From: Hufnagel J
Exelon Corp
To: Ashley D
Office of Nuclear Reactor Regulation
References
FOIA/PA-2008-0306
Download: ML083231016 (2)


Text

Donnie Ashley From: <john.hufnagel@exeloncorp.com> Uohn.hufnagel@exeloncorp.com]

Sent: Friday, April 11, 2008 4:07 PM To: Donnie Ashley

Subject:

RE: draft - summary of telecon Follow Up Flag: Follow up Flag Status: Flagged

bonnie, First, you have Gary Stevens name spelled correctly, and he works for Structural Integrity Associates, Inc.

The words look pretty good, but I have asked a couple of the guys who were on the call to take a look also. Mike Guthrie indicated he has a comment or two, and I want to consolidate any comments and get them to you. I will plan to contact you Monday in the morning, before I head off to TMI. Thanks, bonnie.

- John,


Original Message -----

From: D. Ashley [1]

Sent: Thursday, April 10, 2008 12:48 PM To: Hufnagel Jr, John G

Subject:

draft - summary of telecon John-I have to go to a meeting in a few minutes and am off on Friday.

Here is the first cut at a summary of our telecon.

please review and comment.

also, I need the name of the company that Gary Stevens works for....

Is his name spelled correctly?

-Donnie DISCUSSION OF INDUSTRY EXPERIENCE OYSTER CREEK NUCLEAR GENERATING STATION LICENSE RENEWAL APPLICATION April 7, 2008 The U.S. Nuclear Regulatory Commission staff (NRC or the staff), and representatives of AmerGen Energy Company, LLC (AmerGen or the applicant), held a telephone conference call on April 7, 2008, to discuss the question of industry experience as it relates to metal fatigue and the use of simplified calculations in the "Fatigue Pro" software program. The conference call was useful in clarifying the applicant's use of the "Fatigue Pro" software.

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During the evaluation of the Vermont Yankee license renewal application and hearing process, the staff has become aware that the industry may be using a non-conservative calculation to evaluate metal fatigue in BWRs.

The calculation involves the use of "Green Functions" as a simplification to the analysis.

The applicant stated that the only component where Green Functions were used is the Reactor Recirculation outlet nozzle. None of the other calculations involved the use of Green Functions The applicant stated that they were aware of the issue. The applicant stated that they have plans to perform a confirmatory analysis of the outlet nozzle, using the more conservative calculations, to insure that the components cumulative usage factor (CUF) is within specifications.

The applicant will provide the results of the analysis to the staff. The applicant plans to complete the analysis within 30 days.

Donnie Ashley NRR/DLR/RPB1 License Renewal Project Manager for Oyster Creek 301-415-3191 dial (nrc.gov

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