ML11318A223

OL - Issues Identified During Review of 9/30/11 Fire Protection RAI Response

ML11318A223
Person / Time
Site:	Watts Bar
Issue date:	10/12/2011
From:	Office of Nuclear Reactor Regulation
To:	Division of Operating Reactor Licensing
References
Download: ML11318A223 (2)

Text

WBN2Public Resource From: Poole, Justin Sent: Wednesday, October 12, 2011 9:17 AM To: Arent, Gordon Cc: WBN2HearingFile Resource

Subject:

Issues identified during review of 9/30/11 Fire Protection RAI response

Gordon, During the staffs review of the 9/30/11 RAI response on fire protection, the staff identified the following issues.

Please review to ensure understanding of the staffs concerns.

Justin C. Poole Project Manager NRR/DORL/LPWB U.S. Nuclear Regulatory Commission (301)415-2048 email: Justin.Poole@nrc.gov The fire protection reviewers have identified the following issues with the content of TVAs 9/30 RAI response letter:

1) There appears to be a mistake in the Hazen-Williams equation on Page E1-15, where TVA subtracts twice the delta diameter (due to corrosion) from the nominal pipe diameter. TVA has described their assumption of pipe corrosion as a reduced pipe diameter of 0.8 inches. If they really meant a reduced radius, then the equation is correct.

A follow-up question would be: If they are using the equation incorrectly, how long have they been doing this for, and what is the impact?

2) The staff finds TVAs response to Item 30 to be confusing. The reviewers expected that the answer to what required for auxiliary control means would be that these cables support alternate shutdown from the Auxiliary Control Room (for a fire in an alternate shutdown area, that is, in the Control Building), and were not needed for safe shutdown for a fire in the Auxiliary Building. This is a different situation from being needed for a fire in the Auxiliary Control Room, as response states.

1

Hearing Identifier: Watts_Bar_2_Operating_LA_Public Email Number: 593 Mail Envelope Properties (19D990B45D535548840D1118C451C74DAB34A3294F)

Subject:

Issues identified during review of 9/30/11 Fire Protection RAI response Sent Date: 10/12/2011 9:16:45 AM Received Date: 10/12/2011 9:16:47 AM From: Poole, Justin Created By: Justin.Poole@nrc.gov Recipients:

"WBN2HearingFile Resource" <WBN2HearingFile.Resource@nrc.gov>

Tracking Status: None "Arent, Gordon" <garent@tva.gov>

Tracking Status: None Post Office: HQCLSTR02.nrc.gov Files Size Date & Time MESSAGE 1496 10/12/2011 9:16:47 AM Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:

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