ML071580958

E-MAIL: (NPA-PD) Amendment 16 Reply

ML071580958
Person / Time
Site:	Pilgrim
Issue date:	05/08/2007
From:	Perry Buckberg NRC/NRR/ADRO/DLR
To:	Sanchez E Entergy Nuclear Operations
References
TAC MD3698
Download: ML071580958 (2)

Text

Page 1 of 1 Perry Buckberg - Amendment 16 reply From:

Perry Buckberg To:

Edward Sanchez Date:

5/8/2007 9:53:06 AM

Subject:

Amendment 16 reply Ed, Please review and pass on this preliminary response to Amendment 16.

It looks like we' need to speak with them about this. Our SE for BWR VIP-74 states that an accetable method for performing the ax/al weld failure probability TLAA for license renewal is to determine the mean RT-NDT for the limiting axial weld at the end of the extended operating period and to verify that it is less than the results specified in Table 3 of the 3/7/2000 BWR VIP-05 SER supplement. Therefore, even though the limiting mean RT-NDT values for the analyses in the 3/7/2000 BWRVIP-05 SER supplement are for a 40 year operating period, they were determined to generate an accurate and acceptable axial weld failure probability value. Therefore, if the spediic license renewal mean RT-NDT value (projected to 54 EFPY) remains bounded by the limiting mean RT-NDT value from the the BWRVIP-05 SER Supplement, it can be concluded that the axial weld failure probability will remain less than the maximum acceptable axial weld failure frequency of 5 E-6 per reactor-operating-year (from the BWR VIP-05 supplement) for the extended period of operation.

Thanks, Perry file://C:\\temp\\GW}00002.HTM 5/31/2007

c.\\tem p\\GW}00002.TMP Page II

_902.TMP Page 11 Mail Envelope Properties (464080C2.B71 : 9 : 8248)

Subject:

Creation Date From:

Created By:

Amendment 16 reply 5/8/2007 9:53:06 AM Perry Buckberg PHBI (1nrc.gov Recipients entergy.com esanchl (Edward Sanchez)

Action Transferred Delivered Date & Time 5/8/2007 9:53:36 AM Post Office Route entergy.com Files MESSAGE TEXT.htm Options Auto Delete:

Expiration Date:

Notify Recipients:

Priority:

ReplyRequested:

Return Notification:

Concealed

Subject:

Security:

To Be Delivered:

Status Tracking:

Size 1742 1518 Date & Time 5/8/2007 9:53:06 AM No None Yes Standard No None No Standard Immediate Delivered