ML17359A019

La - NextEra Meeting with NRC

ML17359A019
Person / Time
Site:	Seabrook
Issue date:	08/22/2017
From:	NRC
To:
References
17-953-02-LA-BD01
Download: ML17359A019 (11)

Text

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 1

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: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:

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