ML12200A244

Email from A. Sheikh, NRR to B. Lehman, NRR Et Al Davis-Besse Shield Building RAI

ML12200A244
Person / Time
Site:	Davis Besse
Issue date:	12/13/2011
From:	Sheikh A H Division of License Renewal
To:	Auluck R C, Lehman B C Division of License Renewal
References
FOIA/PA-2012-0121
Download: ML12200A244 (2)

Text

CuadradoDeJesus, Samuel From: Sheikh, Abdul Sent: Tuesday, December 13, 2011 5:09 PM To: Lehman, Bryce; Auluck, Rajender Cc: CuadradoDeJesus, Samuel

Subject:

RE: Davis Besse Shield Building RAI Attachments:

DB Containment Crack RAI-abdul.DOC I have added request for some specific information on the attached file. Some of the information I have requested is the gray area of part 50/54. However, I feel it is better to ask it since such information has not been formally requested previously by the NRC.From: Lehman, Bryce .~,.-. .....Sent: Tuesday, December 13, 2011 3:52 PM To: Sheikh, Abdul; Auluck, Rajender Cc: CuadradoDejesus, Samuel

Subject:

FW: Davis Besse Shield Building RAI Can you please review the attached RAI and forward it to Samuel once you have concurred?

Thanks, Bryce From: CuadradoDeJesus, Samuel Sent: Tuesday, December 13, 2011 1:31 PM -To: Lehman, Bryce Cc: Davis-BesseHearingFile Resource

Subject:

Davis Besse Shield Building RAI Bryce, With all the parties and frequent interruptions I almost forgot to get in touch with you on the issue with the shield building RAI. Can you let me know when I'll get your final draft?Thanks Samuel Cuadrado de Jesis Project Manager Projects Branch 1 Division of License Renewal U.S. Nuclear Regulatory Commission Phone: 301-415-2946 Samuel.CuadradoDeJesus@nrc.gov I

RAI B.2.39-X

Background:

In order to perform a scheduled reactor head replacement, a construction opening was made in the concrete shield building.

During hydro-demolition of the concrete shield building, cracks were identified in the 'architectural shoulders' of the shield building.

While investigating the extent of the cracking, additional cracks were identified around the shield building.

The additional cracks were identified using an Impulse Response (IR) technique and core bores were used to verify the IR results.Issue: Extensive cracking in the shield building could affect the st:uc:;rl integrity of the shield building and may impact its ability to perform its intended functir'iduning the period of extended operation.

Request: 1. Summarize the shield building degrad0abi'the root cause. and'.he expected corrective actions. 2. Explain Low the recent plant-specific

o. ng exper4 nce impactsethe Shield Building's ability to perform its intended functions doxti Include a list of any additional agin !§ffects that ma § anagement bas6dfon this operating experience.

' , ......3. Explain how the recent plant-specifiqb.0ratig e nce will be incorporated into the Structures Monitoring ProgramrAMP,':andthe currerbroaram will be adequate to.nmanage aging of.the shield builditddurinbih7eeriod dl,*tended operation, based on this operatina ori eide S ecif iI "ya-do thýfllowh!!

i. DetailA f te~tS Alned to the longtefm effect of the concrete cracks on the ability dfldbrebars toicarrv ii. -MPlans. if a`Nfto r ir`becrack 6r reinforce the shield building concrete"" laiis to dr-" ent4d thickness of cracks, and corrosion of the;rl; Plans, iffito Der.f'ri detailed'i uctural analysis, with explicit modeling of r6bars. cracks, anrd!concrete.4 demonstrate that the shield building will perform its intiihd design funcroh. over "thit.0nq term. This analysis should also consider the and' nvironm 6it on the concrete and rebar during the period of extended oeration.4. Identify and expliin p iy changes to the license renewal application based on the recent plant specific opleiratifng experience.

or not-Deleted: whether or not a plant-specific program is necessary to-[ Deleted.Formatted:

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