ML23089A070
| ML23089A070 | |
| Person / Time | |
|---|---|
| Site: | River Bend  |
| Issue date: | 03/29/2023 |
| From: | Bradley Jones NRC/NRR/DORL/LPL4 |
| To: | Samson Lee Entergy Operations |
| Drake, J | |
| References | |
| EPID L-2023-LLA-0037 | |
| Download: ML23089A070 (1) | |
Text
Some people who received this message don't often get email from samson.lee@nrc.gov. Learn why this is important From:
Jones, Brian A. (RBS)
To:
Samson Lee Cc:
Crawford, Randy; Jason Drake; Jennifer Dixon-Herrity
Subject:
[External_Sender] RE: Request from NRC POC for River Bend 3/27/23 - 3/31/23 Date:
Wednesday, March 29, 2023 4:11:11 PM
- Sam,
The River Bend plant level HCLPF value of 0.3g is established by the following calculation:
RBS-SA-11-00001 Revision 0, "Re-Assessment of River Bend Seismic Core Damage Frequency",
dated July 2011 and supplemented via Engineering Change 93084 Markup dated February 2023
If you need any more information please let me know.
- Thanks,
Brian Jones
From: Samson Lee <Samson.Lee@nrc.gov>
Sent: Wednesday, March 29, 2023 6:02 AM To: Jones, Brian A. (RBS) <bjone10@entergy.com>
Cc: Crawford, Randy <RCRAWFO@entergy.com>; Jason Drake <Jason.Drake@nrc.gov>; Jennifer Dixon-Herrity <Jennifer.Dixon-Herrity@nrc.gov>
Subject:
Request from NRC POC for River Bend 3/27/23 - 3/31/23
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- Brian,
Good morning. I am Jasons backup project manager while he is away.
The NRC staff is conducting an acceptance review for the River Bend TSTF-505 and 10 CFR 50.69 license amendment requests (LARs) and has identified a need for clarification before the staff can reach a conclusion on the acceptability of the LARs.
For the seismic risk estimate supporting both LARs, the licensee proposed to use a parameter, termed the plant-level HCLPF, value of 0.3g PGA for both the 505 and 50.69 LARs. This value represents a non-standard and substantially increased value from 0.1g as documented in the NRCs GI-199 report for River Bend.
The staff notes that the LARs did not provide any references that may contain documentation (e.g., key elements of a seismic margin assessment) and calculations (e.g.,
seismic fragilities of SSCs contributing to the seismic margin) to justify the proposed HCPLF value of 0.3g. Please identify such references. The staff plans to review them in a regulatory audit and expects to have some portion of the information docketed to make its regulatory finding. If the licensee does not have this information, the staff believes the LARs cannot be accepted for review until the licensee has developed such information because there will be no basis for a positive regulatory finding.
Please let me know if you have any questions.
- Thanks, Sam
From: Jason Drake <Jason.Drake@nrc.gov>
Sent: Friday, March 24, 2023 2:57 PM To: Jones, Brian A. (RBS) <bjone10@entergy.com>
Cc: Samson Lee <Samson.Lee@nrc.gov>; Jennifer Dixon-Herrity <Jennifer.Dixon-Herrity@nrc.gov>;
Crawford, Randy <RCRAWFO@entergy.com>
Subject:
NRC POC for River Bend 3/27/23 - 3/31/23
- Brian,
I will be out of the office from 3/27/23 to 3/31/23. During my time away your NRC POC will be Sam Lee. Please feel free to contact him with any questions and Cc me on emails.
Samson.Lee@nrc.gov 301-415-3168
Thank you,
Jason Drake Project Manager Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Phone: (301) 415-8378
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