ML20073F882

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COL Docs - FW: Audit Discussion Topics for LAR 19-019 Follow Up
ML20073F882
Person / Time
Site: Vogtle  
Issue date: 03/13/2020
From:
NRC
To:
NRC/NRR/DNRL
References
Download: ML20073F882 (9)
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Text

From:

Habib, Donald Sent:

Friday, March 13, 2020 9:27 AM To:

Vogtle PEmails

Subject:

FW: Audit Discussion Topics for LAR 19-019 Follow Up Attachments:

Audit Closeout Q5.pdf; Audit Closeout Q3.pdf From: Arafeh, Yasmeen N. <YNARAFEH@southernco.com>

Sent: Thursday, March 12, 2020 4:05 PM To: Habib, Donald <Donald.Habib@nrc.gov>

Cc: Patel, Pravin <Pravin.Patel@nrc.gov>; Lehman, Bryce <Bryce.Lehman@nrc.gov>

Subject:

[External_Sender] Audit Discussion Topics for LAR 19-019 Follow Up Hi Don, To address the audit discussion question 3, we are proposing to modify Note 1 in UFSAR Table 3H.5-9 Sheets 1, 2a, and 2c, so that Note 1 becomes a clarification to the table instead of it being misinterpreted as an additional 2%. Please see attached for the markups from Q3 to Note 1. It was also noted during the discussion call that the footnote in the UFSAR should not be deleted, and I wanted to clarify that the markups in LAR-19-019 are an excerpt from the UFSAR, and that the footnote will remain during incorporation of the updated table values.

Additionally, after further consideration on audit discussion question 5, we believe that Change 3 in LAR-19-019 is not a change to the current methodology, and that updating the UFSAR to reflect the element size change would be an excessive detail. However, to address the Staffs concern, we are proposing to add the following statement to the technical justification for Change 3 (as shown in the attached PDF for Q5):

The seismic design of the AP1000 nuclear island relies on the analysis methods and FEA models described in DCD Chapter 3.7 and related appendixes. These ANSYS models (i.e., NI-05, NI-10, NI-20, etc.) are sufficiently detailed to capture global and in-structure response at key equipment and building locations. However, for detailed design, local FEA models with a refined mesh size different than the global seismic models are sometimes utilized to capture more detailed response needed to evaluate the effects of local demand and localized stresses to design reinforcement in localized areas. These subsystem models utilize the seismic inputs and boundary conditions consistent with the nuclear island model(s). The seismic analysis methods for local models are the same as those used for the Nuclear Island models and are described in DCD Section 3.7.2.

Please let me know if these follow up actions address the Staffs concerns from our audit discussion call held on 3/11.

Best, Yasmeen Arafeh Nuclear Development, Licensing Work: (205)992-7190

ynarafeh@southernco.com

Hearing Identifier:

Vogtle_COL_Docs_Public Email Number:

546 Mail Envelope Properties (BN8PR09MB35249CDCDD00E6C024CE413497FA0)

Subject:

FW: Audit Discussion Topics for LAR 19-019 Follow Up Sent Date:

3/13/2020 9:27:24 AM Received Date:

3/13/2020 9:27:27 AM From:

Habib, Donald Created By:

Donald.Habib@nrc.gov Recipients:

"Vogtle PEmails" <Vogtle.PEmails@nrc.gov>

Tracking Status: None Post Office:

BN8PR09MB3524.namprd09.prod.outlook.com Files Size Date & Time MESSAGE 2467 3/13/2020 9:27:27 AM image001.png 1703 Audit Closeout Q5.pdf 136782 Audit Closeout Q3.pdf 141275 Options Priority:

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Revise UFSAR Table 3H.5-9 (Sheet 1 of 3), Shield Building Roof Reinforcement Summary (Tension Ring) as shown below.

Tension Ring - Axial Force and Bending Verification Location Seismic Maximum Stresses Maximum Stresses ksi Fy ksi Maximum Steel Area Required(2)

(in2/ft)

[Steel Area Provided]*

[Design Limit(1) for Ratio Max Required/Provided]*

Section Angles Seismic L/C fa ksi

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[Liner 1 1/2" =

18 (in2/ft)

(Min)]*

[0.51 + 2%1.00]*









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Location Seismic Maximum Stresses Maximum Stresses ksi Fy ksi Maximum Steel Area Required(2)

(in2/ft)

[Steel Area Provided]*

[Design Limit(1) for Ratio Max Required/Provided]*

Section Angles Seismic L/C fa ksi

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[Liner 1 1/2" =

18 (in2/ft)

(Min)]*

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Notes:

1. [Two The two percent of the ratio value that may be added to the design limit as is an allowance for minor variances in analysis results.]*

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Revise UFSAR Table 3H.5-9 (Sheet 2a of 3), Shield Building Roof Reinforcement Summary (Air Inlet) as shown below.

AIS Reinforcement Summary - Horizontal Sections Location (Figure 3H.5-11)

Required - Seismic Load Combinations (in2/ft)

Maximum Required(2)

(in2/ft)

[Provided]*

[Design Limit(1) for Ratio Max Required/Provided]*

Section Angles Seismic L/C Values











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[0.20 0.42 + 2%]*













































[Liner 1" =

12 (in2/ft) (Min)]*

[0.15 0.30 + 2%]*







Notes:

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Revise UFSAR Table 3H.5-9 (Sheet 2c of 3), Shield Building Roof Reinforcement Summary (Air Inlet) as shown below.

Out of Plane Shear Reinforcement Summary -AIS Location (Figure 3H.5-11)

Required - Seismic Load Combinations (in2/ft)

Maximum Required(2)

(in2/ft)

[Steel Area Provided]*

[Design Limit(1) for Ratio Max Required/Provided]*

Angles Sections Seismic L/C Values Sum





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Out of Plane Shear Reinforcement Summary -AIS Location (Figure 3H.5-11)

Required - Seismic Load Combinations (in2/ft)

Maximum Required(2)

(in2/ft)

[Steel Area Provided]*

[Design Limit(1) for Ratio Max Required/Provided]*

Angles Sections Seismic L/C Values Sum





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Notes:

1. [Two The two percent of the ratio value that may be added to the design limit as is an allowance for minor variances in analysis results.]*
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