ML070380088

E-mail: (PD) Drywall Air Gap Foam

ML070380088
Person / Time
Site:	Pilgrim
Issue date:	01/22/2007
From:	Ford B Entergy Corp
To:	Perry Buckberg NRC/NRR/ADRO/DLR
References
TAC 3698
Download: ML070380088 (3)

Text

Page 1 of I Perry Buckberg - Drywell Air gap Foam From: "Ford, Bryan" <BFord@entergy.com>

To: "Perry Buckberg" <PHB 1 @nrc .gov>

Date: 1/22/2007 5:11:47 PM

Subject:

Drywell Air gap Foam CC: "Mogolesko, Fred" <fmogole@entergy.com>, "Dyckman, John" <jdyckma@entergy.com>,

"Ellis, Douglas" <dellisl @entergy.com>

Perry, During one of our discussions Dan Hoang asked how the PNPS response to Generic Letter 87-05 which said that the construction Etha Foam in the air gap had been removed was consistent with the statement.in Amendment 2 that "The presence of ethafoam rings left in place at certain elevations of the drywell caused a concern that they could trap and hold leakage from the bellows or fuel pool and cause corrosion of the shell outer surface."

The answer is that the Etha Foam that was used in large quantities during the construction of the drywell was removed. Strips of foam (the installation specification calls them polyethylene foam strips) were then installed near the top of the air gap. It appears that these strips were installed to prevent foreign materials from failing into the air gap exclusion.

Therefore, both statements are technically correct. The Etha Foam used for construction was removed but there are foam strips in the air gap that were evaluated as part of the containment inspection program.

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Drywell Air gap Foam Creation Date 1/22/2007 5:11:09 PM From: "Ford, Bryan" <BFord@entergy.com>

Created By: BFord@entergy.com Recipients nrc.gov OWGWPO01 .HQGWDO0I PHB1 (Perry Buckberg) entergy.com dellisl CC (Douglas Ellis) jdyckma CC (John Dyckman) fmogole CC (Fred Mogolesko)

Post Office Route OWGWPO01 .HQGWDO01 nrc.gov entergy.com Files Size Date & Time MESSAGE 1039 1/22/2007 5:11:09 PM TEXT.htm 3091 Mime.822 6799' Options Expiration Date: None Priority: Standard ReplyRequested: No Return Notification: None Concealed

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