Text

AP1000 Structural Reconciliation - Westinghouse Electric Company & Southern Nuclear Company Technical Exchange Meeting: August 13, 2019
	ML19214A201
Person / Time
Site:	Vogtle
Issue date:	08/02/2019
From:	; Westinghouse
To:	; Office of New Reactors
Shared Package
ML19214A196	List: ML19214A197; ML19214A198; ND-19-0962, AP1000 Structural Reconciliation - Westinghouse Electric Company & Southern Nuclear Company Technical Exchange Meeting: August 13, 2019;
References
	ND-19-0962 APP-GW-GLY-177, Rev 0
	Download: ML19214A201 (36)
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1 Westinghouse Non-Proprietary Class 3

This is the non-proprietary version of these slides.

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Westinghouse Non-Proprietary Class 3 2

Westinghouse Electric Company & Southern Nuclear Company Technical Exchange Meeting: August 13, 2019 AP1000 Structural Reconciliation

- - This record was final approved on 7/26/2019 11:57:08 AM. (This statement was added by the PRIME system upon its validation)

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Agenda

Introductions

Background - Zach Harper

Process - Kevin Moore

Building Seismic Analysis - Tod Baker

Basemat Building Report Review - Jon Ambrose

Summary

Questions / Follow-up

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Zach Harper Manager - Structural and Mechanical Licensing

Background

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Background

A commitment was made in the UFSAR to update the building summary reports to reflect the final design. As an example, for the nuclear island basemat, this commitment is shown in UFSAR subsection 3.8.5.4.3 as follows:

- A design summary report is prepared for the basemat documenting that the structures meet the acceptance criteria specified in subsection 3.8.5.5.

- Deviations from the design due to as-procured or as-built conditions are acceptable based on an evaluation consistent with the methods and procedures of Sections 3.7 and 3.8 provided the following acceptance criteria are met.

The structural design meets the acceptance criteria specified in Section 3.8 The seismic floor response spectra meet the acceptance criteria specified in subsection 3.7.5.4

- The results of the evaluation will be documented in an as-built summary report.

- - This record was final approved on 7/26/2019 11:57:08 AM. (This statement was added by the PRIME system upon its validation)

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Background

The ITAAC requires that as-built summary reports be provided for each plant.

The information in the as-built summary report validates that as-built structures have been reviewed for conformance to the approved design of the subject structures and satisfy the ITAAC acceptance criteria.

The as-built summary report along with the as-designed summary report summarizes the design of the following nuclear island (NI) structures:

- Nuclear Island Basemat

- Other Containment Internal Structures

- CA20

- Shield Building

- Auxiliary Building (except CA20 module)

- Containment Structural Modules

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Background

ITAAC 3.3 00.02a.i.a 3.3 00.02a.i.b 3.3 00.02a.i.c 3.3 00.02ai.d a,c

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NI Structure ITAAC

Background

3.3 00.02a.i.a Other Containment Internal Structures Containment Structural Modules 3.3 00.02a.i.b Shield Building 3.3 00.02a.i.c 3.3 00.02a.i.d Nuclear Island Basemat*

(also part of ITAACs a.i.a and a.i.b)

CA20 Auxiliary Building (except CA20 and Basemat)

As-Designed Summary Report As-Built Summary Report Nuclear Island Seismic

& Structural Analyses 2.D.12(g)1 2.D.12(g)2 License Condition a,c a,c

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J. Kevin Moore Manager - Construction Support Civil/Structures Design - NI Vogtle Units 3 & 4 Process

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Process - Related Processes/Procedures/Guidelines

Design Change Process - APP-GW-GAP-341

E&DCR Process - APP-GW-GAP-420

Non-Conformance Process - APP-GW-GAP-428

Screening Guideline Document - APP-GW-S0Y-001

- - This record was final approved on 7/26/2019 11:57:08 AM. (This statement was added by the PRIME system upon its validation)

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Process - E&DCRs

Uses

- Design changes required to correct/clarify the design

- Design changes required to simplify construction

Examples: t-heads vs. hooked reinforcing bars, rebar splice locations, mechanical coupler locations

Procedures

- Various types of design changes are described in APP-GW-GAP-341

- E&DCR requirements are defined in APP-GW-GAP-420

- Licensing impact reviews per APP-GW-GAP-147

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Process - Non-Conformances

Uses

- N&D dispositions address non-conforming items in the field

- Typically dispositioned as use-as-is or repair Examples: missed additional reinforcement, form savers out of position, wall thickness, clear cover on vertical reinforcement

- Supporting calculations are reviewed for the area in question, if margin is impacted, the calc note is listed as impacted document

- If analysis does not support use-as-is disposition, construction is instructed to correct the condition (repair)

- All debt associated with drawings and calculations is reviewed for each non-conformance disposition

Procedure

- APP-GW-GAP-428

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Process - Document Review/Screening

Screening Guideline Document - APP-GW-S0Y-001

Data dump is performed for documents contained in each Building Report document list (e.g. APP-1010-CRR-001 for the basemat)

Data is screened per criteria provided in Section 4.1 of APP-GW-S0Y-001 to determine where:

- Changes in demand may be caused by changes in the design documents (drawings, specifications, etc.) that affect structural mass, concrete strength, section properties or stiffness, which could affect the structural analyses (e.g. seismic or thermal response)

- Changes in allowable may be caused by changes in the design documents (drawings, specifications, etc.) or site deviations which affect the properties of the structural section

- Changes where the impact cannot be clearly identified by the screening engineer require review by the home office responsible engineer

- - This record was final approved on 7/26/2019 11:57:08 AM. (This statement was added by the PRIME system upon its validation)

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Process - Document Review/Screening (contd)

Changes that impact margin are captured in impacted structural analysis documents (calcs):

- Direct impacts to APP calcs

- Indirect impacts to APP calcs using a site specific placeholder (to be incorporated into the APP calcs)

As calculations are reviewed for impact to margin, all previous debt against them are reviewed so that a cumulative effect is considered.

- - This record was final approved on 7/26/2019 11:57:08 AM. (This statement was added by the PRIME system upon its validation)

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Process - Document Review/Screening (contd)

Screening results are provided to the home office responsible engineer for further review as needed

- Items that impact available margin by >50%

- Items where the screening engineer was uncertain about impact

Engineering reviews results against as-designed reports and either performs reconciliation if needed or authors the final as-built building summary report.

- - This record was final approved on 7/26/2019 11:57:08 AM. (This statement was added by the PRIME system upon its validation)

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Process - Summary

Design changes and non-conformances in the field are archived as construction is completed, per applicable procedures

A collection of debt against the design is screened and reviewed by engineering

Results that meet criteria in the screening document for further review are sent to headquarters engineering for further review

As-built building reports summarize this review and confirm that as-built condition meets the structural design as described in the current licensing basis.

- - This record was final approved on 7/26/2019 11:57:08 AM. (This statement was added by the PRIME system upon its validation)

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Tod Baker Consulting Engineer - Civil, Structural and Architectural Engineering Building Seismic Analysis

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Building Seismic Analyses and Building Reports a,c

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Building Seismic Analyses

As-designed seismic models capture changes

- Seismic models (NI20, NI10) and stress models (NI05) are reviewed to determine if changes to the design need to be incorporated

- Design changes come from several sources Design change proposals (DCPs)

License amendment requests (LARs)

Engineering & design coordination reports (E&DCRs)

Corrective action program (CAPs)

- The as-designed condition is reconciled to the generic design through comparison of updated model results to the model described in the license

- Most changes do not impact the seismic model More significant changes have been part of LARs and the changes have been incorporated into the seismic model

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Reconciliation of Building Seismic Analyses UFSAR 3.7.5.4 provides the criteria for reconciliation of seismic analyses of NI structures

- The Combined License holder will reconcile the seismic analyses described in subsection 3.7.2 for detail design changes, such as those due to as-procured or as-built changes in component mass, center of gravity, and support configuration based on as-procured equipment information.

Deviations are acceptable based on an evaluation consistent with the methods and procedure of Section 3.7 provided the amplitude of the seismic floor response spectra, including the effect due to these deviations, does not exceed the design basis floor response spectra by more than 10 percent. The Combined License holder will complete this reconciliation prior to fuel load.

- - This record was final approved on 7/26/2019 11:57:08 AM. (This statement was added by the PRIME system upon its validation)

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Reconciliation of Building Seismic Analyses

Seismic model reconciliation process

- Major changes are assessed for global impact

- If the design change is determined to have potential for significant effect on seismic analysis, it is included in the updated seismic model APP-1000-S3R-008 to evaluate the cumulative impact

- Floor response spectra are generated at the six key locations as defined in the licensing basis using an updated model that reflects the significant design changes

- Spectra at the six key locations are compared to UFSAR Figures 3G.4-5 through 3G.4-10 APP-1000-S3R-008 is updated as necessary to evaluate changes and contains the cumulative effect of changes

- - This record was final approved on 7/26/2019 11:57:08 AM. (This statement was added by the PRIME system upon its validation)

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As-Built Seismic Report The as-built seismic reports will be completed once the as-built building reports are finalized Deviations are reviewed to confirm that the existing seismic analysis is adequate to capture the deviations This is based on knowledge of the model and the effect of specific changes on the model If the deviation is determined to have potential for significant effect on seismic analysis, it is included in the updated seismic model APP-1000-S3R-008 to evaluate the cumulative impact Most site-specific changes/deviations are not significant enough to affect the detail of the seismic model Deviations are evaluated for the potential to affect the global seismic model However, minor wall thickness deviations, minor reinforcement changes, etc. are not significant enough to affect mass or stiffness and do not have a significant effect on the global seismic analysis

- - This record was final approved on 7/26/2019 11:57:08 AM. (This statement was added by the PRIME system upon its validation)

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Example of Change Process in Seismic Analyses

Incorporation of permanent formwork plates (PFPs)

- Evaluation of the effect of PFPs on the seismic model is performed in E&DCR APP-1242-GEF-182 The E&DCR impacts APP-1000-S2R-008

- The PFPs combine several smaller embedded plates into a larger embedment to facilitate installation and simplify construction

- The PFPs potentially add mass and stiffness due to their size

- The change in stiffness and mass in the seismic model is evaluated in detail using equivalent modular properties consistent with current AP1000 seismic methodology

- Each effect of the change was evaluated and found to have an insignificant effect on the design

- The change is incorporated into the seismic model so that if future changes in the same region are made, the cumulative effect on the seismic model is addressed

- - This record was final approved on 7/26/2019 11:57:08 AM. (This statement was added by the PRIME system upon its validation)

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Example of Change Process in Seismic Analyses

Incorporation of CAPAL 100314180

- CAPAL 100314180 identified that several SPL18 beams are missing grating masses and CA01_38 floor are missing live load

- The change was evaluated for impact to the seismic model and to the associated design elements The seismic model was updated in APP-1000-S3R-008 The module wall design was evaluated and it was found that there was no significant impact to the design Interaction Ratio (IR)

Floor module CA01_38 was re-evaluated and it was found that there was no significant impact to the design IR There was no impact to the SPL18 beam design because the beams are evaluated in a separate GTSTRUDL model that used the appropriate dead load

- Each effect of the change was evaluated and found to have an insignificant effect on the design

- The change is incorporated into the seismic model so that if future changes in the same region are made, the cumulative effect on the seismic model is addressed Documentation of the effect on structural elements (i.e. walls, floors) is also performed and demonstrated to be insignificant (E&DCRs are in process)

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Jonathan Ambrose - Manager AP1000 Concrete and Rebar Building Report Review - NI Basemat

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NUREG 0800 Requirements

The final design of the standard plant seismic Category I building structures is documented in a series of as-designed summary reports.

Each as-designed summary report is developed to address the information outlined in Appendix C of Section 3.8.4 NUREG 0800.

The as-designed summary report describes the standard design documented by the design calculations. The design calculations for the given part of the structure are referenced and key calculations are summarized.

- - This record was final approved on 7/26/2019 11:57:08 AM. (This statement was added by the PRIME system upon its validation)

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As-Designed Report NUREG 0800 Table Outline The table below is taken from the Basemat As-Designed Summary Report APP-1010-S3R-007. It shows which section of the As-Designed Summary Report addresses Appendix C of Section 3.8.4 NUREG 0800.

NUREG 0800 APP-1010-S3R-007 STRUCTURAL DESCRIPTION AND GEOMETRY Structural Geometry and Dimensions Section 3.1 Key Structural Elements and Description Section 3.1 Floor Layout and Elevations Section 3.1 Conditions of Vicinity and Supports Sections 3.1, 3.5, 3.6 Special Structural Features Section 3.1 STRUCTURAL MATERIAL REQUIREMENTS Concrete Section 3.3 A. Compressive Strength B. Modulus of Elasticity C. Shear Modulus D. Poissons Ratio Reinforcement Section 3.3 A. Yield Stress B. Tensile Strength C. Elongation

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As-Designed Report NUREG 0800 Table Outline NUREG 0800 APP-1010-S3R-007 Structural Steel N/A A. Grade B. Ultimate Tensile Strength C. Yield Stress Prestressing Stage (if applicable)

N/A A. Type of System (manufacturer)

B. Description of Tendons C. Description of Surcharge D. Tendons and Sheeting Layout E. Dome Prestressing Foundation Media Sections 3.5, 4.1.1, 4.2.1, 4.3.1, Table 3.6-2 [

]a,c A. General Description B. Unit Weight C. Shear Modulus D. Angle of Internal Friction E. Cohesion F. Bearing Capacity Special Considerations N/A STRUCTURAL LOADS Live and Dead Load Floor Plans Section 3.4.1

[

]a,c Determination of Transient and Dynamic Loads Sections 3.4.3, 3.4.4, 3.4.5 Manufacturers Data on Equipment Loads

[

]a,c Environmental Loads Sections 3.4.2, 3.4.3

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As-Designed Report NUREG 0800 Table Outline NUREG 0800 APP-1010-S3R-007 Torsional Effects

[

]a,c STRUCTURAL ANALYSIS AND DESIGN Design Computations of Critical Elements Section 4.1 Stability Calculations Sections 3.4.2, 4.1.2, 4.1.5 on overturning Engineering Drawings Including Details of Connections and Joints Figures 4.2-2 to 4.2-8 and also as listed in Section 2.3 (APP-1010-CRR-001 & 002)

Discussion of Unique Features and Problem Resolution Sections 4.2.1, 4.3

SUMMARY

OF RESULTS The Required Sections See Section B of Table 2-1 The Provided Sections Section 4.2 and Section B of Table 2-1 Breakdown of Individual Load Contributions See Section B of Table 2-1 Tabulation of Capacities of the Section Versus Capacities Required for Different Failure Modes (Bending, Shear, Axial Load)

See Section B of Table 2-1 Margins of Safety Provided Section 4.2.1 and Table 2-1 CONCLUSIONS Section 4.4

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Inspections, Test, Analyses and Acceptance Criteria (ITAAC)

ITAAC require that As-Built summary reports be provided for each plant

The As-Built report is intended to support the following:

ITAAC 3.3.00.02a.i.a

ITAAC 3.3.00.02a.i.b

ITAAC 3.3.00.02a.i.c

ITAAC 3.3.00.02a.i.d

The as-built report validates that the as-built structures have been reviewed for conformance to the approved design of the subject structures and satisfy the ITAAC acceptance criteria.

The ITAAC requires that deviations from the approved design for Seismic Category I building structures be identified and reconciled to determine that the structure can withstand design basis loads.

- - This record was final approved on 7/26/2019 11:57:08 AM. (This statement was added by the PRIME system upon its validation)

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UFSAR Table 3.3-6 ITAAC Requirements

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As-Built Summary Report

The scope of the as-built summary reports includes all relevant deviation notices, unit specific Engineering & Design Coordination Reports (E&DCRs), and standard E&DCRs applicable to the building issued after the corresponding as-designed summary report as completed.

The as-built report reconciles deviations during construction and concludes that the as-built nuclear island basemat, including the critical sections, conform to the approved design and will withstand the design basis loads without loss of structural integrity or the safety-related functions.

The as-built report supports Vogtle ITAAC criteria and supplements the as-designed summary report.

- - This record was final approved on 7/26/2019 11:57:08 AM. (This statement was added by the PRIME system upon its validation)

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Summary

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Summary The as-built summary reports along with the as-designed summary reports summarize the design of each nuclear island (NI) structure, in accordance with NUREG 0800 (Section 3.8.4 Appendix C).

Design changes and non-conformances are archived as construction is completed, and are tightly controlled per applicable procedures.

Results that meet criteria in the screening document for further review are sent to the home office responsible engineer for further review As-built building reports summarize this review and confirm that as-built condition meets the structural design as described in the current licensing basis.

As calculations are reviewed for impact to margin, all previous debt against them are reviewed so that a cumulative effect is considered.

Deviations are also reviewed to confirm that the existing seismic analysis is adequate to capture the deviations If the deviation is determined to have potential for significant effect on seismic analysis, it is included in the updated seismic model (APP-1000-S3R-008) for evaluation Most site-specific changes/deviations are not significant enough to affect the detail of the seismic model

- - This record was final approved on 7/26/2019 11:57:08 AM. (This statement was added by the PRIME system upon its validation)

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Questions / Follow-up

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APP-GW-GLY-177 Revision 0 Proprietary Class 3

- This page was added to the quality record by the PRIME system upon its validation and shall not be considered in the page numbering of this document.**

Files approved on Jul-26-2019 Approval Information Admin Preliminary Review Approval Rodgers Cheryl A Jul-25-2019 17:17:40 Admin Peer Check Approval Schillinger Danielle L Jul-25-2019 17:25:58 Author Approval Rocco Christina L Jul-25-2019 17:48:17 Reviewer Approval Schmiech Edward Jul-25-2019 17:53:39 Reviewer Approval Kuyler Ray Jul-25-2019 18:00:49 Reviewer Approval Baker Tod Jul-26-2019 08:16:36 Verifier Approval Meneely Jennifer E Jul-26-2019 08:21:57 Manager Approval Meneely Jennifer E for Harper Zachary S Jul-26-2019 11:57:08

- - This record was final approved on 7/26/2019 11:57:08 AM. (This statement was added by the PRIME system upon its validation)

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ND-19-0962, AP1000 Structural Reconciliation - Westinghouse Electric Company & Southern Nuclear Company Technical Exchange Meeting: August 13, 2019

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ND-19-0962, AP1000 Structural Reconciliation - Westinghouse Electric Company & Southern Nuclear Company Technical Exchange Meeting: August 13, 2019

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