ML071640324

E-MAIL: (NPA-PD) Fw: Pilgrim Fluence RAIs

ML071640324
Person / Time
Site:	Pilgrim
Issue date:	05/07/2007
From:	Sanchez E Entergy Corp
To:	Perry Buckberg NRC/NRR/ADRO/DLR/RLRA
References
TAC MD3698
Download: ML071640324 (3)

Text

Per Bcbeg-RE_:FW_:Pilgrim FluenceRA Page-1 From:

"Sanchez, Edward" <esanchl@entergy.com>

To:

"Perry Buckberg" <phbl @nrc.gov>

Date:

5/7/2007 4:46:05 PM

Subject:

RE: FW: Pilgrim Fluence RAIs

Perry, Thanks. I've passed it on. We should be able to support a call tomorrow 5/8 anytime after 10 am.

Ed

---

Original Message -----

From: Perry Buckberg @nrc.gov

Sent: Monday, May 07, 2007 4:38 PM To: Sanchez, Edward

Subject:

Re: FW: Pilgrim Fluence RAIs Ed, I passed on you e-mail to the staff. Please pass on this preliminary response to Amendment 16 to your staff and we will talk.

Thanks, Perry For the TLAA on the axial weld failure probability. They came up with a limiting fluence of 8.48 eel8 for this TLAA, however it should be only 3.3 eel8. This was an error in the max fluence backcalculation report by Structural Integrity Associates, Inc. It resulted from them assuming an invalid limiting mean RTNDT value for the axial weld failure probability. They pulled this number (172.4 deg. F) from the original BWRVIP-05 analysis. They should've used the number for the Pilgrim axial weld from the 3/7/2000 BWRVIP-05 SER supplement (114 deg. F).

This is a simple error, however it invalidates their conclusions in all of their revised RV neutron embrittlement TLAAs because the use of correct mean RTNDT value of 114 deg. F would result in the axial weld failure probability TLAA being the limiting TLAA for the fluence, and this limiting fluence value is lower (3.3 eel 8)than what they used (4.12 eel8) from the SAI report. The limiting fluence value of 4.12 eel8 from the SAI report is for the P-T limits/ hydrotest TLAA. If they backcalculated the limitng fluence for the axial weld TLAA correctly, it would be 3.3 eel8, which would be the most limiting fluence for all TLAAs (as opposed to 4..12 eel8 from the P-T limits TLAA).

Thanks, Perry Buckberg Project Manager - Division of License Renewal phone: (301)415-1383 fax:

(301)415-3031 phbl @nrc.gov

>>> "Sanchez, Edward" <esanchl@entergy.com> 05/07/07 3:27 PM >>>

Perry, Does the response below adequately answer the question you asked this morning regarding reference temperature?

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Perry Buckbero - RE: FW: Pilarim Fluence ~Ai~

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Ed Sanchez Pilgrim Licensing

---

Original Message-----

From: Timothy J. Griesbach [1]

Sent: Monday, May 07, 2007 2:33 PM To: Sanchez, Edward

Subject:

RE: Pilgrim Fluence RAIs Ed, The reference temperatures for axial and circumferential welds came from the NRC SER for VIP-05. However, VIP-05 only applies for 32 EFPY.

Table 2.6-5 of the SER and VIP-74A apply for license renewal up to 64 EFPY. That's why the numbers are different.

I am available for a call anytime tomorrow after 10:00 a.m. EST.

Tim Tim Griesbach Associate.

Structural Integrity Associates, Inc.

Experts in the prevention and control of structural and mechanical failures 3315 Almaden Expwy, Suite 24 San Jose, CA 95118 Phone: (408) 833-7350 Cell: (510) 304-4397 Fax: (408) 978-8964 email: tgriesbach@structint.com

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RE: FW: Pilgrim Fluence RAIs 5/7/2007 4:45:22 PM "Sanchez, Edward" <esanchl (@entergy.com>

esanch I (@entergy.com Recipients nrc.gov OWGWPO01.HQGWDO01 PHB 1 (Perry Buckberg)

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