ML12108A066

NRR E-mail Capture - Quad Cities Unit 2 Relief Request I4R-19 - Additional Follow-up Question Regarding Reference 5

ML12108A066
Person / Time
Site:	Quad Cities
Issue date:	04/14/2012
From:	Joel Wiebe Division of Operating Reactor Licensing
To:	Gullott D, Bauer J, Mathews M Exelon Generation Co
References
TAC ME8347
Download: ML12108A066 (2)

Text

NRR-PMDAPEm Resource From: Wiebe, Joel Sent: Saturday, April 14, 2012 1:07 PM To: 'David Gullott'; 'Joseph Bauer'; 'Mitchel Mathews'

Subject:

Quad Cities Unit 2 Relief Request I4R Additional Follow-up Question Regarding Reference 5 REQUEST FOR ADDITIONAL INFORMATION REGARDING QUAD CITIES NUCLEAR POWER STATION, UNIT 2 VESSEL PENETRATION RELIEF REQUEST NO. I4R-19 DOCKET NO. 50-265 (TAC NO. ME8347)

Flaw Evaluation RAI-7 The operating stresses were developed using an axi-symmetrical finite element model (FEM) to simulate the RPV-nozzle assembly. Provide sufficient information to demonstrate that use of the 2.5 times the RPV radius for the axi-symmetrical model is adequate to account for difference in the membrane stresses between the sphere and cylinder of the same thickness and radius in this application. Stating that, This value is based on experience with modeling similar geometries, is not sufficient.

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Hearing Identifier: NRR_PMDA Email Number: 339 Mail Envelope Properties (F371D08C516DE74F81193E6D891DC4AF8FE8C07CD9)

Subject:

Quad Cities Unit 2 Relief Request I4R Additional Follow-up Question Regarding Reference 5 Sent Date: 4/14/2012 1:07:16 PM Received Date: 4/14/2012 1:07:00 PM From: Wiebe, Joel Created By: Joel.Wiebe@nrc.gov Recipients:

"'David Gullott'" <David.Gullott@ExelonCorp.com>

Tracking Status: None

"'Joseph Bauer'" <Joseph.Bauer@exeloncorp.com>

Tracking Status: None

"'Mitchel Mathews'" <Mitchel.Mathews@exeloncorp.com>

Tracking Status: None Post Office: HQCLSTR02.nrc.gov Files Size Date & Time MESSAGE 734 4/14/2012 1:07:00 PM Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:

Recipients Received: