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COL Docs - (External_Sender) 4/11/19 Public Meeting Slides for Environmental Conditions for Inputs to Civil/Structural Design Topic
	ML19091A261
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Vogtle PEmails From: Arafeh, Yasmeen N. <YNARAFEH@southernco.com>

Sent: Monday, April 1, 2019 10:58 AM To: Patel, Chandu; Habib, Donald; Gleaves, Bill Cc: Agee, Stephanie Y.; Chamberlain, Amy Christine; Aughtman, Amy G.;

'harperzs@westinghouse.com'; Wu, Si

Subject:

[External_Sender] 4/11/19 Public Meeting Slides for Environmental Conditions for Inputs to Civil/Structural Design Topic Attachments: APP-GW-GLY-172.pdf Chandu, Don, and Billy:

The attached document is provided for the Public Meeting on Thursday, April 11, 2019.

Best, Yasmeen Arafeh Nuclear Development, Licensing Work: (205)992-7190 ynarafeh@southernco.com 1

Hearing Identifier: Vogtle_COL_Docs_Public Email Number: 438 Mail Envelope Properties (BN8PR04MB563593A0C3106112CD298574BB550)

Subject:

[External_Sender] 4/11/19 Public Meeting Slides for Environmental Conditions for Inputs to Civil/Structural Design Topic Sent Date: 4/1/2019 10:57:51 AM Received Date: 4/1/2019 11:01:05 AM From: Arafeh, Yasmeen N.

Created By: YNARAFEH@southernco.com Recipients:

"Agee, Stephanie Y." <SYAGEE@southernco.com>

Tracking Status: None "Chamberlain, Amy Christine" <ACCHAMBE@southernco.com>

Tracking Status: None "Aughtman, Amy G." <AGAUGHTM@SOUTHERNCO.COM>

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"'harperzs@westinghouse.com'" <HARPERZS@WESTINGHOUSE.COM>

Tracking Status: None "Wu, Si" <wu1s@westinghouse.com>

Tracking Status: None "Patel, Chandu" <Chandu.Patel@nrc.gov>

Tracking Status: None "Habib, Donald" <Donald.Habib@nrc.gov>

Tracking Status: None "Gleaves, Bill" <Bill.Gleaves@nrc.gov>

Tracking Status: None Post Office: BN8PR04MB5635.namprd04.prod.outlook.com Files Size Date & Time MESSAGE 229 4/1/2019 11:01:05 AM image001.png 1723 APP-GW-GLY-172.pdf 552526 Options Priority: Standard Return Notification: No Reply Requested: Yes Sensitivity: Normal Expiration Date:

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LAR-132: Environmental Conditions for Inputs to Civil/Structural Design -

NRC Technical Exchange Meeting April 11, 2019 Westinghouse Electric Company LLC 1

Meeting Purpose and Agenda Meeting Purpose

Technical exchange meeting to discuss the proposed changes in LAR-132

Receive and address Staff feedback Agenda

Background Information

Approach to the licensing basis markups

Proposed Changes

Applicable Regulatory Requirements The information in this presentation is preliminary and will be finalized prior to LAR submittal.

2

Background Information

The thermal loads are design basis loads in AP1000 licensing basis for seismic category I structures.

UFSAR Table 3H.5-1 specifies the design temperatures for thermal gradient in Nuclear Island.

Thermal load inconsistencies exist between licensing basis and design documents. A design change package proposed to modify Table 3H.5-1 to align the inconsistencies.

3

Approach to the licensing basis markups

UFSAR tables in Sections 3.8 and 3H show demands of critical sections.

During design certification, each table is determined what was included. Some of the tables include thermal loads in the demands, some of the tables exclude thermal loads from the demands through a thermal note.

The following tables include the thermal loads in the demands: 3.8.3-3, 3.8.3-4, 3.8.3-5, 3.8.3-6, 3.8.3-7, 3H.5-2, 3H.5-4, 3H.5-6 , 3H.5-8, 3H.5-9 Sheet 3, 3H.5-10, 3H.5-14, and 3H.5-15.

The following tables do not include the thermal loads as result of the thermal note: 3.8.5-3, 3H.5-3, 3H.5-5, 3H.5-7, 3H.5-9 Sheets 1-2c, 3H.5-11, 3H.5-12, and 3H.5-13.

Approach in the current licensing basis is maintained in LAR-132 markups.

Thermal note in the licensing basis tables 4

Change No.1: Shield Building PCS Tank Normal Thermal Change Reason for the Change

There is an inconsistency of the normal thermal load for the PCS tank between UFSAR Subsection 3H.3.3 & Table 3H.5-1 and UFSAR Table 6.2.2-1 & Technical Specification.

- UFSAR Table 6.2.2-1 and COL Appendix A SR 3.6.6.1 define the minimum temperature in PCS tank is 40 °F.

- PCS recirculation heater keeps water in the PCS tank at minimum of 40 °F.

- UFSAR Subsection 3H.3.3 and Table 3H.5-1 show the water in PCS tank is 70 °F.

Proposed Changes:

Revise the normal thermal load for the PCS Tank in UFSAR Subsection 3H.3.3 and Table 3H.5-1 to be consistent with other sections in UFSAR and design documents. (+70 °)°F)

No involved changes to critical sections.

No impact on the PCS system.

5

Change No.1: Shield Building PCS Tank Normal Thermal Change

Revise the normal thermal inside PCS tank from +70°F to +40°F in UFSAR Subsection 3H.3.3 and Table 3H.5-1.

Tier 2* text in Subsection 3H.3.3 Table 3H.5-1 6

Change No.1: Shield Building PCS Tank Normal Thermal Change - Involved Sections

PCS Tank Exterior Wall: No impact on Table 3H.5-9 Sheet 3 Table shows combined SSE + Normal Thermal; No thermal note; No impact on the table.

7

Change No.1: Shield Building PCS Tank Normal Thermal Change - Involved Sections

SB Roof: No impact on Table 3H.5-15 Table shows combined SSE + Normal Thermal; No thermal note; No impact on the table.

8

Change No.2: MSIV Room Accident Thermal Change Reason for the Change

There is an inconsistency of accident air temperature for the MSIV (Main Steam Isolation Valve) compartment between UFSAR Table 3H.5-1 and UFSAR Figure 3D.5-9 MSIV Compartment Response to Main Steam Line Break & plant analyses.

There is an inconsistency of accident surface temperature for the MSIV compartment between UFSAR Table 3H.5-1 and updated calculations.

Proposed Changes:

Revise the accident air temperature for the MSIV compartment in UFSAR Table 3H.5-1 to be consistent with UFSAR Figure 3D.5-9. (+132 °)°F)

Revise the accident surface temperature for the MSIV compartment in UFSAR Table 3H.5-1 to reflect the updated calculations. (+132 °)°F)

No involved changes to critical sections.

No impact on Equipment Qualification because no change to Figure 3D.5-9.

No impact on MSIV compartment pressurization.

No impact on structural design because existing structures have sufficient margin to accommodate this thermal loading.

9

Change No.2: MSIV Room Accident Thermal Change

Revise the accident air temperature of MSIV room from +132°F to

+485°F and accident surface temperature from +132°F to +222°F in UFSAR Table 3H.5-1.

10

Change No.2: MSIV Room Accident Thermal Change

- Involved Sections

No impact on critical section Wall 11 (North wall of aux)

No impact on critical section Wall L (East wall of east MSIV compartment) 11

Change No.3: Auxiliary Building Exterior Walls below Grade and Basemat Accident Thermal Change Reason for the Change

Table 3D.5-4 defines the abnormal environments as a function of equipment location outside containment.

There is an inconsistency of accident thermal loads for the exterior walls below grade and basemat in auxiliary building between UFSAR Table 3H.5-1 and UFSAR Table 3D.5-4.

Proposed Changes:

Revise the accident thermal loads for the exterior walls below grade and basemat in auxiliary building in UFSAR Table 3H.5-1 to be consistent with UFSAR Table 3D.5- 15°F Outside/ +140 °F Inside)

Involved changes in Wall 1 Table 3H.5-2 (updating the governing load combination)

No impact on Equipment Qualification because no change to Table 3D.5-4.

No impact on structural design because existing structures have sufficient margin to accommodate the thermal loading.

12

Change No.3: Auxiliary Building Exterior Walls below Grade and Basemat Accident Thermal Change

Revise the accident thermal for the exterior walls below grade and basemat in the auxiliary building from N/R to +50 °F Outside/ +140 °F Inside in UFSAR Table 3H.5-1.

13

Change No.3: Auxiliary Building Exterior Walls below Grade and Basemat Accident Thermal Change - Involved Sections

Wall 1: Impact Table 3H.5-2.

Table shows governing load combinations at specific elevations.

No thermal note; Impact on the load combinations.

14

Change No.3: Auxiliary Building Exterior Walls below Grade and Basemat Accident Thermal Change - Involved Sections

Wall 1: No Impact on Table 3H.5-3.

Table shows demands under mechanical loads with thermal note; No impact on the table.

15

Change No.3: Auxiliary Building Exterior Walls below Grade and Basemat Accident Thermal Change - Involved Sections

Basemat: No impact on Table 3.8.5-3.

Table shows demands under mechanical loads with thermal note; No impact on the table.

16

Applicable Regulatory Requirements

GDC 1 - Quality Standards and Records

GDC 2 - Design bases for protection against natural phenomena

GDC 4 - Environmental and dynamic effects design bases

10 CFR Part 50, Appendix S - Earthquake Engineering Criteria for Nuclear Power Plants

10 CFR 50.150 - Aircraft Impact Assessment 17

Discussion Questions/Discussion 18

ML19091A261

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