ML071580958

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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. OurSE for BWR VIP-74 states thatan accetablemethod 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 operatingperiod and to verify that it is less than the resultsspecified 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 operatingperiod, they were determinedto generate an accurate andacceptableaxial weld failure probability value. Therefore, if the spediic license renewal mean RT-NDT value (projectedto 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 acceptableaxial 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

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

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Amendment 16 reply Creation Date 5/8/2007 9:53:06 AM From: Perry Buckberg Created By: PHBI (1nrc.gov Recipients Action Date & Time entergy.com Transferred 5/8/2007 9:53:36 AM esanchl (Edward Sanchez)

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