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COL Docs - Vogtle COLs - Technical Meeting on Shake-Space LAR January 11, 2018
	ML18010A915
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Site:	Vogtle
Issue date:	01/10/2018
From:	; NRC
To:	; NRC/NRO/DNRL/LB4
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1 Vogtle PEmails From:

Habib, Donald Sent:

Wednesday, January 10, 2018 4:10 PM To:

Vogtle PEmails

Subject:

Vogtle COLs - Technical Meeting on Shake-Space LAR January 11, 2018 Attachments:

Slides to Support LAR 205 Discussion.pdf This presentation will be discussed at the NRC public meeting with Southern Nuclear Company at 9am on January 11, 2018.

From: Ridgway, Paige [1]

Sent: Thursday, January 04, 2018 4:28 PM To: Hoellman, Jordan <Jordan.Hoellman2@nrc.gov>

Cc: Patel, Chandu <Chandu.Patel@nrc.gov>; Haggerty, Neil <X2NHAGGE@SOUTHERNCO.COM>; Sparkman, Wesley A. <WASPARKM@southernco.com>; Dixon-Herrity, Jennifer <Jennifer.Dixon-Herrity@nrc.gov>

Subject:

[External_Sender] RE: Technical Meeting on Shake-Space LAR Hey Jordan!

See attached for the slides that will be used to support the discussion next Thursday on WEC LAR 205 Seismic Gap Changes. Please let me know if you have any questions! Thanks!

Paige Ridgway Licensing Engineer Nuclear Development Regulatory Affairs Work: (205)992-7516 I Cell: (205)542-9702 ptapscot@southernco.com From: Sparkman, Wesley A.

Sent: Thursday, January 4, 2018 8:48 AM To: Hoellman, Jordan <Jordan.Hoellman2@nrc.gov>; Dixon-Herrity, Jennifer <Jennifer.Dixon-Herrity@nrc.gov>

Cc: Patel, Chandu <Chandu.Patel@nrc.gov>; Ridgway, Paige <PTAPSCOT@SOUTHERNCO.COM>

Subject:

RE: Technical Meeting on Shake-Space LAR Should be today.

Thanks, Wes.

From: Hoellman, Jordan [2]

Sent: Thursday, January 4, 2018 8:28 AM To: Dixon-Herrity, Jennifer <Jennifer.Dixon-Herrity@nrc.gov>; Sparkman, Wesley A.

<WASPARKM@southernco.com>

Cc: Patel, Chandu <Chandu.Patel@nrc.gov>

Subject:

RE: Technical Meeting on Shake-Space LAR

2 Hi Wes -

I confirm that the staff we think will be involved in the review are available on 1/11.

When do you think youll be able to provide a pre-submittal document for our staff to review?

Thanks, Jordan From: Dixon-Herrity, Jennifer Sent: Wednesday, January 03, 2018 12:09 PM To: Sparkman, Wesley A. <WASPARKM@southernco.com>; Hoellman, Jordan <Jordan.Hoellman2@nrc.gov>

Cc: Patel, Chandu <Chandu.Patel@nrc.gov>

Subject:

RE: Technical Meeting on Shake-Space LAR Wes, that topic is the only listed topic on the meeting set up in our internal calendar for that day, so I think I can confirm it for you. Jordan will verify when he returns tomorrow. Thank you, Jen Jennifer L. Dixon-Herrity Chief, Licensing Branch 4 Division of New Reactor Licensing Office of New Reactors 301-415-2967 From: Sparkman, Wesley A. [3]

Sent: Wednesday, January 03, 2018 11:16 AM To: Dixon-Herrity, Jennifer <Jennifer.Dixon-Herrity@nrc.gov>; Patel, Chandu <Chandu.Patel@nrc.gov>

Subject:

[External_Sender] Technical Meeting on Shake-Space LAR

Jennifer, I understand that Chandu is our of the office. Today is my first day back and I dont recall if we settled on 1/11/17 as a good day for the Staff to have a technical discussion related to a proposed LAR on the 4 Shake Space. Has that been confirmed?

Thanks, Wes.

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Subject:

Vogtle COLs - Technical Meeting on Shake-Space LAR January 11, 2018 Sent Date:

1/10/2018 4:10:21 PM Received Date:

1/10/2018 4:10:37 PM From:

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Westinghouse Non-Proprietary Class 3 1

1 Jan 11, 2018 Westinghouse Electric Company LLC Seismic Gap Changes SNC LAR-18-002 (WEC LAR-205)

- - This record was final approved on 1/4/2018 3:17:15 PM. ( This statement was added by the PRIME system upon its validation)

2

Westinghouse Non-Proprietary Class 3 Meeting Purpose

Technical exchange meeting to discuss seismic gaps between nuclear island and adjacent buildings

Receive and Address Staff Feedback Agenda

Overview of Issue

Discussion of Seismic Gap Between the Nuclear Island and Seismic Category II Buildings

Discussion of Seismic Gap Between the Nuclear Island and Non-Seismic Buildings

Proposed Changes to the Licensing Basis

Schedule Meeting Purpose and Agenda

- - This record was final approved on 1/4/2018 3:17:15 PM. ( This statement was added by the PRIME system upon its validation)

3

Westinghouse Non-Proprietary Class 3

Background:

The design nominal above-grade spacing between the Nuclear Island (NI) and the Turbine Building (TB), Annex Building (AB) and Radwaste Building (RB) is 4 inches.

The minimum above-grade ITAAC gap between these same buildings is also 4 inches.

Problem Statement:

Constructing adjacent walls under these conditions and meeting other ACI requirements for tolerances and concrete cover has proven to be extremely challenging.

Removal of surface material for localized ITAAC exceedances has proven to be time consuming.

Construction methods cannot assure that localized exceedances or construction conflicts will not occur in future placements.

Proposed Resolution:

Reduce the minimum ITAAC gap from 4" to 3" for the NI to TB and AB

Eliminate the ITAAC gap requirement for the NI to RB

The nominal design gap between buildings will be maintained at 4" above grade.

Overview

- - This record was final approved on 1/4/2018 3:17:15 PM. ( This statement was added by the PRIME system upon its validation)

4

Westinghouse Non-Proprietary Class 3

Background:

Current construction requirement: 4" minimum gap between the Nuclear Island (NI) and Turbine Building (TB)/Annex Building (AB) above grade. (Ref. Tier 1 Table 3.3-6, UFSAR Appendix 2.5E Section 5.2 and Subsections 3.7.2.8.1 and 3.8.5.1)

Current design acceptance criteria: 1" minimum gap during a seismic event.

(Ref. UFSAR Subsection 3.8.5.1)

Current calculations demonstrate margin is greater than the licensing basis design acceptance criteria.

Problem Statement:

Challenges with maintaining the minimum 4" gap during construction.

NI and TB gap constructed <4" at one localized area.

Additional localized exceedances may be identified in future concrete pours.

Proposed Resolution:

Reduce the minimum construction requirement from 4" to 3".

Update calculations to continue to demonstrate the design acceptance criteria (1" minimum gap during seismic event) is met.

Note: This LAR does not propose any change to the gap below grade.

Change 1: Seismic Gaps between Nuclear Island and Seismic Category II Buildings

- - This record was final approved on 1/4/2018 3:17:15 PM. ( This statement was added by the PRIME system upon its validation)

5

Westinghouse Non-Proprietary Class 3 Change 1: Seismic Gaps between Nuclear Island and Seismic Category II Buildings Licensing Basis Current LB Requirements Proposed LB Requirements Calculations Supporting Proposed LB Requirements T1 Table 3.3-6 TB&AB: 4" min gap TB&AB: 3" min gap N/A T2 3.7.2.8.1 AB: YAr

AB: YAr

Updated calculation will demonstrate YN1 + YAr = 0.951" T2 3.8.5.1 AB: YN1 + YAr

TB: XN2 + XTr

AB: YN1 + YAr

TB: XN2 + XTr

Updated calculation will demonstrate YN1 + YAr = 0.951" Updated calculation will demonstrate XN2 + XTr = 1.040" AB: 4" - (YN1 + YAr

TB: 4" - (XN2 + XTr

AB: 3" - (YN1 + YAr

TB: 3" - (XN2 + XTr

N/A Note:

1. A settlement evaluation will be performed and it is not expected to impact the 1" minimum acceptance criteria..

- - This record was final approved on 1/4/2018 3:17:15 PM. ( This statement was added by the PRIME system upon its validation)

6

Westinghouse Non-Proprietary Class 3

Background:

Current construction requirement: 4" minimum gap between the Nuclear Island (NI) and the Radwaste Building (RB). (Ref. Tier 1 Table 3.3-6 and UFSAR Subsection 3.7.2.8.2)

Current design acceptance criteria: The RB impact on the NI during a seismic event will not impair its structural integrity. (Ref. UFSAR Subsection 3.7.2.8.2)

Current calculations demonstrate the design meets licensing basis design acceptance criteria Problem Statement:

The gap between the NI and the RB is not an input to the impact evaluation of RB on NI, therefore it does not affect the acceptance criteria of RB.

It is not meaningful to perform the ITAAC inspection on the RB gap when it does not contribute to the design/analysis.

Proposed Resolution:

Delete the requirement of gap between the RB and NI in Tier 1 Table 3.3-6, item 13.

Modify UFSAR Subsection 3.7.2.8.2 from a minimum 4" clearance to a nominal 4" clearance.

Update calculations to continue to demonstrate the design acceptance criteria (no impairment on NI integrity) is met.

Change 2: Seismic Gaps between Nuclear Island and Non-Seismic Buildings

- - This record was final approved on 1/4/2018 3:17:15 PM. ( This statement was added by the PRIME system upon its validation)

7

Westinghouse Non-Proprietary Class 3 Change 2: Seismic Gaps between Nuclear Island and Non-Seismic Buildings Licensing Basis Current LB Requirements Proposed LB Requirements Calculations Supporting Proposed LB Requirements T1 Table 3.3-6 RB: 4" min gap RB: Delete gap requirement from T1 The evaluation of Radwaste Building (RB) was made to consider its impact on Nuclear Island (NI) or collapse in the safe shutdown earthquake. The gap between the NI and the RB is not an input to the impact evaluation of RB on NI, therefore it does not affect the acceptance criteria of RB (no impairment on NI integrity) in UFSAR Subsection 3.7.2.8.2.

Updated calculations will continue to demonstrate the design acceptance criteria is met.

T2 3.7.2.8.2 RB: 4" min gap RB: XN1

RB: 4" nominal gap RB: XN1

Updated calculation will demonstrate XN1

Proposed LB

- - This record was final approved on 1/4/2018 3:17:15 PM. ( This statement was added by the PRIME system upon its validation)

8

Westinghouse Non-Proprietary Class 3

Propose to change the minimum gap between the NI and the TB/AB above 100'-0" from 4" to 3" in ITAAC No.3.3.00.13.

Propose to delete the minimum gap requirement between the NI and the RB in ITAAC No.3.3.00.13.

Proposed Changes in Licensing Basis Justification: The proposed change does not affect the 1" margin between the NI and TB/AB in seismic event. The maximum relative displacement between Auxiliary roof and Annex/Turbine roof under safe shutdown earthquake is less than 2".

The RB impact on NI is evaluated and confirmed it will not impair the integrity of the NI. As the gap between the NI and the RB is not an input to the impact evaluation, it does not affect the evaluation results.

3 inches and

- - This record was final approved on 1/4/2018 3:17:15 PM. ( This statement was added by the PRIME system upon its validation)

9

Westinghouse Non-Proprietary Class 3

Propose to change the minimum seismic gap between NI and AB above 100'-0" from 4" to 3" in UFSAR Appendix 2.5E Section 5.2.

3 inch minimum Justification: The proposed change does not affect the 1" margin between the NI and the TB/AB in seismic event. The maximum relative displacement between auxiliary roof and annex roof under site specific earthquake is less than 2".

Proposed Changes in Licensing Basis

- - This record was final approved on 1/4/2018 3:17:15 PM. ( This statement was added by the PRIME system upon its validation)

10

Westinghouse Non-Proprietary Class 3

Propose to change the minimum seismic gap between NI and AB above 100'-0" from 4" to 3" in UFSAR Subsection 3.7.2.8.1.

3 inches Justification: The proposed change does not affect the 1" minimum acceptance criteria between the NI and the TB/AB in seismic event. The maximum relative displacement between Auxiliary roof and Annex roof under safe shutdown earthquake is 0.951".

Proposed Changes in Licensing Basis

- - This record was final approved on 1/4/2018 3:17:15 PM. ( This statement was added by the PRIME system upon its validation)

11

Westinghouse Non-Proprietary Class 3

Propose to change the minimum 4" gap between NI and RB above 100'-0" to a nominal 4" gap in UFSAR Subsection 3.7.2.8.2.

Justification: The evaluation of RB was made to consider its impact on NI or collapse in the safe shutdown earthquake. The gap between the NI and the RB is not an input to the impact evaluation of RB on NI, therefore the change does not affect the acceptance criteria of RB (no impairment on NI integrity) in UFSAR Subsection 3.7.2.8.2.

Proposed Changes in Licensing Basis

- - This record was final approved on 1/4/2018 3:17:15 PM. ( This statement was added by the PRIME system upon its validation)

12

Westinghouse Non-Proprietary Class 3

Propose to change the minimum seismic gap between the NI and the TB/AB above 100'-0" from 4" to 3" in UFSAR Subsection 3.8.5.1.

Propose to clarify/separate the seismic gap requirements for TB/AB and RB.

Justification: The proposed change does not affect the 1" margin between NI and TB/AB in seismic event.

The maximum relative displacement between auxiliary roof and annex/turbine roof under safe shutdown earthquake is less than 2".

As discussed in footnote 1 of UFSAR 3.8.5.1, the gap requirement of RB should be separated from the requirements of TB/AB in UFSAR 3.8.5.1 as it is under a different analysis assumption as discussed in UFSAR 3.7.2.8.2. UFSAR 3.8.5.1 is adjusted accordingly.

3-inch 2 inches The radwaste building(1) is separated from the nuclear island by a 2-inch gap at and below grade, and a 4-inch gap above grade.

the nuclear island and adjacent seismic Category II the turbine and annex The Proposed Changes in Licensing Basis

- - This record was final approved on 1/4/2018 3:17:15 PM. ( This statement was added by the PRIME system upon its validation)

13

Westinghouse Non-Proprietary Class 3

NRC Technical Exchange Meeting:

1/11/2018

Planned date of LAR submittal to NRC:

2/1/2018

Planned date of PAR submittal to NRC:

2/2/2018

Planned date of PAR approval by NRC: 2/16/2018 Schedule

- - This record was final approved on 1/4/2018 3:17:15 PM. ( This statement was added by the PRIME system upon its validation)

ML18010A915

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