ML17359A019
| ML17359A019 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 08/22/2017 |
| From: | NRC |
| To: | |
| References | |
| 17-953-02-LA-BD01 | |
| Download: ML17359A019 (11) | |
Text
1 SeabrookLANPEm Resource From:
Poole, Justin Sent:
Tuesday, August 22, 2017 4:22 PM To:
'Deborah Grinnell'
Subject:
RE: Re: NextEra meeting with NRC Attachments:
2017-8-24 Seabrook LAR Stage 3 Public Meeting - FINAL.PDF
- Debbie, Here are the staff's slides that we'll present at the public meeting and below is the conference line information. The meeting focus is on their stage 3 building evaluations.
Participant passcode: 46681#
Toll Free Number: 1-888-790-7136 Justin C. Poole Project Manager NRR/DORL/LPL I U.S. Nuclear Regulatory Commission (301)415-2048
Original Message-----
From: Deborah Grinnell [1]
Sent: Tuesday, August 22, 2017 4:18 PM To: Poole, Justin <Justin.Poole@nrc.gov>
Subject:
[External_Sender] Re: NextEra meeting with NRC
- Justin, What is the content of your meetin with NextEra g..the outline of your questions.
Thank you, Debbie
> On Aug 22, 2017, at 4:12 PM, Deborah Grinnell <grinnelldebbie2@gmail.com> wrote:
> Hello Justin
> I will listen, follow, and may speak with C-10 on the Aug 24th 2017 meeting you will have with NextEra on August 24 at 1-3PM.
> Debbe Grinnell
Hearing Identifier:
Seabrook_LA_NonPublic Email Number:
1117 Mail Envelope Properties (31be334fd633433eb89aa50f9181c219)
Subject:
RE: Re: NextEra meeting with NRC Sent Date:
8/22/2017 4:21:48 PM Received Date:
8/22/2017 4:21:40 PM From:
Poole, Justin Created By:
Justin.Poole@nrc.gov Recipients:
"'Deborah Grinnell'" <grinnelldebbie2@gmail.com>
Tracking Status: None Post Office:
HQPWMSMRS01.nrc.gov Files Size Date & Time MESSAGE 973 8/22/2017 4:21:40 PM 2017-8-24 Seabrook LAR Stage 3 Public Meeting - FINAL.PDF 1591357 Options Priority:
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Recipients Received:
Seabrook Station License Amendment Request Stage 3 Methodology Justin Poole, Project Manager, DORL, NRR Bryce Lehman, Structural Engineer, DE, NRR George Thomas, Senior Structural Engineer, DE, NRR
Agenda Issues with Current Stage 3 Methodology Staff Expectations for Methodology Path Forward Schedule Discussion 2
Stage 3 as Described in LAR Description in LAR of advanced techniques proposed to be used is high-level with no implementation details provided for staff to evaluate as a generic method of evaluation Includes methods whose implementation appear open to interpretation, with no specific applicability limitations, justification or acceptance criteria, and may be outside the design code (ACI 318-71)
LAR notes that analysis will demonstrate compliance with ACI 318-71 3
Staff Concerns with Stage 3 It is unclear how the methodology as described in the LAR could be consistently applied and similar results obtained
- Significant decisions in the Containment Enclosure Building (CEB) calculation appear to be based on engineering judgement
- Stage 3 uses iterative processes with no clear limitations 4
Staff Concerns with Stage 3 Review of Containment Enclosure Building (CEB) calculation identified several general issues:
- ACI 318-71 requirements for moment redistribution do not appear to be met or justified; approach used does not appear to be supported by accepted concrete codes
- Acceptance criteria are not provided for the structural adequacy of sections to develop a plastic hinge
- A limit on moment redistribution iterations is not provided
- No guidance is provided on determining the threshold factor or under what circumstances it can be modified
- No evaluation of serviceability limit state included under normal service load conditions that include ASR 5
Staff Expectations for Methodology The LAR or UFSAR mark-up should include sufficient detail to allow qualified engineer to follow the process through any Stage 3 calc
- How ACI 318-71 requirements will be met and/or justification for alternatives and requirements that are not met
- Guidance/criteria on when proposed analysis techniques and methods can be used
- Limits on the use of iterative processes
- Identified rebar strain limits under normal service conditions including ASR load 6
Path Forward:
Potential LAR Supplement Potential LAR supplement options:
- Update LAR to include detailed, consistently applicable methodology; staff will review a sample of completed calculations
- Approval of partial methodology (Stage 1 & 2); all final Stage 3 evaluations for NRC review and approval
- Other options?
Approach is up to NextEra 7
Impacts on Schedule Staff intends to review a sampling of completed Stage 1, 2 and 3 analyses
- Sampling dependent on analysis complexity and issues identified Schedule dependent on analyses availability
- Analyses should be approved and incorporated by NextEra prior to NRC review 8
Questions?
9