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MONTHYEARML0813702112008-04-22022 April 2008 Oconee - FRP Tbst Program Project stage: Request ML0815800342008-06-0404 June 2008 Handouts from 6/04/2008 Meeting Project stage: Request ML0816907892008-07-0101 July 2008 Summary of Meeting with Duke Energy Carolinas, LLC to Discuss the Testing Program for Fiber-Reinforced Polymer (FRP) at Oconee Nuclear Station, Units 1, 2, and 3 Project stage: Meeting ML0910300072009-04-20020 April 2009 Notice of Forthcoming Meeting with Duke Energy Carolinas, LLC to Discuss a Proposed Licensee Amendment for the Use of Describe Proposed Use of Fiber-Reinforced Polymer (FRP) System Project stage: Meeting ML0915904942009-05-0606 May 2009 Duke Energy Slides from Public Meeting with Duke Energy to Discuss a Proposed License Amendment for the Use of a Fiber-Reinforced Plymer (FRP) System Project stage: Meeting ML0916304732009-06-17017 June 2009 Summary of Public Meeting with Duke Energy Carolinas, LLC, to Discuss a Proposed License Amendment for the Use of a Fiber-Reinforced Polymer (FRP) System Project stage: Meeting 2008-07-01
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Category:Meeting Briefing Package/Handouts
MONTHYEARML22251A2352022-09-14014 September 2022 Presentation Slides for September 14, 2022, Observation Public Meeting ML22130A0092022-04-28028 April 2022 Duke Presentation for April 28, 2022 Public Meeting - Bolting Integrity ML22130A0102022-04-28028 April 2022 Duke Presentation for April 28, 2022 Public Meeting - Containment Liner ML22067A1992022-03-0303 March 2022 Annual Assessment Meeting Presentation ML22063A1142022-01-17017 January 2022 Duke Presentation for Public Meeting on February 17, 2022 ML21235A0452021-08-25025 August 2021 August 25, 2021, Oconee Nuclear Station, Units 1, 2, and 3 Subsequent License Renewal Application Public Environmental Scoping Meeting Presentation ML21102A0632021-04-14014 April 2021 ONS Slides for Pre-Application Meeting to Discuss Proposed Relief Request Related to Code Case N-853 ML21089A1732021-03-30030 March 2021 EOC Slides Final ML21081A1242021-03-22022 March 2021 EOC Slides Final ML20300A0902020-10-27027 October 2020 Subsequent License Renewal Environmental Pre-Application Meeting - NRC Presentation ML20300A0872020-10-27027 October 2020 Subsequent License Renewal Application NRC Environmental Pre-Application Meeting - Duke Energy Presentation ML19318F2912019-11-18018 November 2019 Duke Energy Presentation for the Pre-submittal Meeting on November 18, 2019, Regarding the RPV Stud Examination Relief Request ML19302E0512019-11-0606 November 2019 High Energy Line Break License Amendment Public Meeting ML19214A0562019-08-0707 August 2019 Presentation: Duke Energy Presubmittal Meeting - August 7, 2019 ML19207A0172019-07-30030 July 2019 Summary of Meeting with Duke Energy Carolinas, LLC to Discuss Proposed License Amendment Request for Oconee Nuclear Station, Units 1, 2, and 3 Regarding High Energy Line Break Licensing Basis ML18227B3212018-09-0505 September 2018 Tornado License Amendment Pre-Application Meeting Slides ML18134A2292018-05-14014 May 2018 Summary of April 26, 2018, Public Teleconference with Duke Energy Carolinas, LLC to Discuss Proposed License Amendment and 3 Regarding Technical Specification 3.8.1 ML17258A0122017-09-26026 September 2017 Presentation Slide Regarding Committee to Review Generic Requirements Meeting on Oconee Nuclear Station Cable Separation TIA ML15348A2032015-12-14014 December 2015 Duke Energy Presentation in Support of December 15, 2015, Public Meeting with NRC Staff Cable Testing Discussion for Proposed 50.55a Alternative Request ML15343A1142015-12-0808 December 2015 NRC Questions to Duke Energy Regarding Cable Testing in Support of Public Meeting on 12/15/15 ML15321A1782015-11-17017 November 2015 Presentation Material in Support of November 18, 2015 Pre-Application Meeting Between NRC and Duke 50.55a(z) Alternative to Code and Standards Requirements ML15286A0762015-10-13013 October 2015 Duke Energy Presentation in Support of October 13, 2015, Public Meeting with NRC Staff Pre-Application Meeting for LAR to Support Khu Stator Replacement. (Revised) ML15282A0722015-10-0909 October 2015 Duke Energy Presentation in Support of October 13, 2015, Public Meeting with NRC Staff Pre-Application Meeting for LAR to Support Khu Stator Replacement ML15148A2632015-05-27027 May 2015 Meeting Slides from the May 27, 2015 Oconee Major Projects Between Duke Energy and NRC ML15113A6262015-04-23023 April 2015 April 14, 2015 Summary of Public Meeting on Oconee Nuclear Station, Units 1, 2 and 3 to Discuss the Annual Assessment ML14356A0062014-12-0303 December 2014 Presentation at December 3, 2014, Category 1 Public Meeting with Duke Energy Carolinas, LLC to Discuss NTTF Recommendation 2.1, Flooding Response ML14211A2132014-07-31031 July 2014 Duke Energy Presentation for 2014-07-31 Meeting ML14211A2162014-07-31031 July 2014 NRC Meeting Slides 7-31-14 Reg Conference ML14147A3652014-05-27027 May 2014 Annual Assessment Public Meeting Summary Memo ML14058A0772014-02-0404 February 2014 Slides on Oconee Ssf Flood Barrier Breach SDP Lessons Learned ML14058A0742014-02-0404 February 2014 Slides on Oconee Ssf Flood Barrier Breach SDP - Lessons Learned ML14058A0482014-02-0404 February 2014 NRR Briefing on Oconee Flood Protection (Nrr/Dra) ML13336A5452013-11-13013 November 2013 Presentation Slides from Meeting with Duke Energy Carolinas, LLC, Oconee Nuclear Station Units 1, 2, and 3, Keowee Hydro Unit Generator Field Pole Rewind Project - License Amendment Request ML13312A9882013-11-0808 November 2013 Summary of Public Meeting with Duke Energy Carolinas, LLC, to Provide Opportunities to Discuss the Planned Fukushima-Related Modifications ML13308A0072013-11-0101 November 2013 Open Phase Resolution Update Meeting Duke Energy Entitled Open Phase Detection and Protection. ML13275A2692013-10-0303 October 2013 10/3/13 Presentation Slides from Meeting with Duke Energy Carolinas, LLC, Oconee Nuclear Station Units 1, 2, and 3, Protected Service Water Alternate Cooling ML13275A2252013-09-24024 September 2013 9/24/13 Meeting Slides from Meeting with Duke Energy Carolinas, LLC, Oconee Nuclear Station Units 1, 2, and 3, Jocassee Dam Seismic Analysis ML13239A3372013-08-27027 August 2013 NRC Meeting Slides, Oconee Major Project Meeting - August 28, 2013 ML13239A3402013-08-27027 August 2013 Presentation for NRC Projects ML13099A4472013-04-10010 April 2013 Slides from Meeting with Duke Energy Carolinas, LLC, Oconee Nuclear Station Units 1, 2, and 3, Milestones for Corrective Actions for an Apparent Violation of a License Condition on Fire Protection ML13095A2132013-04-0909 April 2013 Slides from Meeting with Duke Energy Carolinas, LLC, Oconee Nuclear Station Units 1, 2, and 3, External Flood Reevaluation ML13123A2042013-03-25025 March 2013 Slides from Meeting with Duke Energy Carolinas, LLC, Oconee Nuclear Station Units 1, 2, and 3, Concerning the Flooding Hazard Reevaluation Report ML13064A1022013-03-0505 March 2013 Slides from Predecisional Enforcement Conference with Duke Energy Carolinas, LLC, Oconee Nuclear Station Units 1, 2, and 3, Apparent Violation of a License Condition on Fire Protection ML13056A1042013-02-0606 February 2013 Briefing Slides on the Fliod Scenario Rupture of Jocassee Dam ML13056A1032013-02-0606 February 2013 Briefing on Draft Information Notice - Potential Nonconservative Screening Value for Dam Failure Frequency in Probabilistic Risk Assessments. ML13056A1022013-02-0606 February 2013 Meeting Slides on Oconee Flood Issue Jocassee Dam Failure Frequency ML13056A0992013-02-0606 February 2013 Meeting Slides on Oconee Ssf Flood Barrier Breach Sdsp - Lessons Learned ML13052A7822013-02-0606 February 2013 Slides on Oconee Ssf Flood Barrier Breach SDP - Lessons Learned ML13035A2442013-01-30030 January 2013 Projects Meeting - NRC Slides ML13035A2332013-01-30030 January 2013 Projects Meeting - Licensee'S Public Meeting Slides 2022-09-14
[Table view] Category:Slides and Viewgraphs
MONTHYEARML23087A2972023-04-17017 April 2023 Annual Assessment Meeting Presentation ML22251A2352022-09-14014 September 2022 Presentation Slides for September 14, 2022, Observation Public Meeting ML22130A0102022-04-28028 April 2022 Duke Presentation for April 28, 2022 Public Meeting - Containment Liner ML22130A0092022-04-28028 April 2022 Duke Presentation for April 28, 2022 Public Meeting - Bolting Integrity ML22109A2122022-04-20020 April 2022 Duke Energy Pre-Submittal Public April 20, 2022, Meeting Presentation ML22075A2012022-03-0707 March 2022 Duke 03/07/2022 Presentation - Bolting Integrity ML22067A1992022-03-0303 March 2022 Annual Assessment Meeting Presentation ML22301A1672022-02-0505 February 2022 Presentation 5 - Oconee Trip and Notification of Unusual Event on February 5, 2022 ML22063A1142022-01-17017 January 2022 Duke Presentation for Public Meeting on February 17, 2022 ML21322A3262021-11-29029 November 2021 Duke Energy November 29, 2021 Pre-Submittal Public Meeting Slides for EOF Relocation Licensing Amendment Request ML21235A0452021-08-25025 August 2021 August 25, 2021, Oconee Nuclear Station, Units 1, 2, and 3 Subsequent License Renewal Application Public Environmental Scoping Meeting Presentation ML21102A0632021-04-14014 April 2021 ONS Slides for Pre-Application Meeting to Discuss Proposed Relief Request Related to Code Case N-853 ML21089A1732021-03-30030 March 2021 EOC Slides Final ML21081A1242021-03-22022 March 2021 EOC Slides Final ML21034A5552021-01-26026 January 2021 SLRA - NRC Presubmittal Meeting Slides ML21034A5562021-01-26026 January 2021 SLRA - Duke Presubmittal Meeting Slides ML20300A0872020-10-27027 October 2020 Subsequent License Renewal Application NRC Environmental Pre-Application Meeting - Duke Energy Presentation ML20300A0902020-10-27027 October 2020 Subsequent License Renewal Environmental Pre-Application Meeting - NRC Presentation ML20134J0052020-05-13013 May 2020 EOC Slides (2) ML20125A2312020-05-0404 May 2020 EOC Slides ML19318F2912019-11-18018 November 2019 Duke Energy Presentation for the Pre-submittal Meeting on November 18, 2019, Regarding the RPV Stud Examination Relief Request ML19302E0512019-11-0606 November 2019 High Energy Line Break License Amendment Public Meeting ML19214A0562019-08-0707 August 2019 Presentation: Duke Energy Presubmittal Meeting - August 7, 2019 ML18086A7742018-02-21021 February 2018 LOR Program Biennial Inspection 71111.11B Exam Overlap Issues ML17296A1462017-10-24024 October 2017 Duke Energy Presentation to CRGR - Oconee Nuclear Station ML17258A0122017-09-26026 September 2017 Presentation Slide Regarding Committee to Review Generic Requirements Meeting on Oconee Nuclear Station Cable Separation TIA ML15348A2032015-12-14014 December 2015 Duke Energy Presentation in Support of December 15, 2015, Public Meeting with NRC Staff Cable Testing Discussion for Proposed 50.55a Alternative Request ML15282A0722015-10-0909 October 2015 Duke Energy Presentation in Support of October 13, 2015, Public Meeting with NRC Staff Pre-Application Meeting for LAR to Support Khu Stator Replacement ML15148A2632015-05-27027 May 2015 Meeting Slides from the May 27, 2015 Oconee Major Projects Between Duke Energy and NRC ML15113A6262015-04-23023 April 2015 April 14, 2015 Summary of Public Meeting on Oconee Nuclear Station, Units 1, 2 and 3 to Discuss the Annual Assessment ML14356A0062014-12-0303 December 2014 Presentation at December 3, 2014, Category 1 Public Meeting with Duke Energy Carolinas, LLC to Discuss NTTF Recommendation 2.1, Flooding Response ML14211A2132014-07-31031 July 2014 Duke Energy Presentation for 2014-07-31 Meeting ML14211A2162014-07-31031 July 2014 NRC Meeting Slides 7-31-14 Reg Conference ML14147A3652014-05-27027 May 2014 Annual Assessment Public Meeting Summary Memo ML14058A0512014-02-0404 February 2014 Slides on Oconee Nuclear Station - Standby Shutdown Facility (Ssf) Flood Barrier Breach Violation SDP Assessment ML14058A0352014-02-0404 February 2014 Meeting Slides on Oconee Flood Protection and the 10 CFR 50.54(f) Response ML14055A4102014-02-0404 February 2014 Meeting Slides on Standby Shutdown Facility Flood Barrier Breach Violation Informal Reassessment ML14058A0742014-02-0404 February 2014 Slides on Oconee Ssf Flood Barrier Breach SDP - Lessons Learned ML14058A0772014-02-0404 February 2014 Slides on Oconee Ssf Flood Barrier Breach SDP Lessons Learned ML13336A5452013-11-13013 November 2013 Presentation Slides from Meeting with Duke Energy Carolinas, LLC, Oconee Nuclear Station Units 1, 2, and 3, Keowee Hydro Unit Generator Field Pole Rewind Project - License Amendment Request ML13312A9882013-11-0808 November 2013 Summary of Public Meeting with Duke Energy Carolinas, LLC, to Provide Opportunities to Discuss the Planned Fukushima-Related Modifications ML13308A0072013-11-0101 November 2013 Open Phase Resolution Update Meeting Duke Energy Entitled Open Phase Detection and Protection. ML13275A2692013-10-0303 October 2013 10/3/13 Presentation Slides from Meeting with Duke Energy Carolinas, LLC, Oconee Nuclear Station Units 1, 2, and 3, Protected Service Water Alternate Cooling ML13275A2252013-09-24024 September 2013 9/24/13 Meeting Slides from Meeting with Duke Energy Carolinas, LLC, Oconee Nuclear Station Units 1, 2, and 3, Jocassee Dam Seismic Analysis ML13239A3402013-08-27027 August 2013 Presentation for NRC Projects ML13239A3372013-08-27027 August 2013 NRC Meeting Slides, Oconee Major Project Meeting - August 28, 2013 ML13226A2662013-05-0303 May 2013 E-mail from J. Boska, NRR to S. Hicks, Ois FW: Change in Public Availability of Slide Package ML13226A2592013-04-23023 April 2013 E-mail from D. Hubbard, Duke to J. Boska, NRR on Non-Security Sensitive Version of March 25th Presentation ML13226A2652013-04-23023 April 2013 E-mail from D. Hubbard, Duke to J. Boska, NRR on Security Sensitive Version ML13099A4472013-04-10010 April 2013 Slides from Meeting with Duke Energy Carolinas, LLC, Oconee Nuclear Station Units 1, 2, and 3, Milestones for Corrective Actions for an Apparent Violation of a License Condition on Fire Protection 2023-04-17
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License Amendment Request to Incorporate Use of Fiber-Reinforced Polymer System to Strengthen Existing Auxiliary Building Masonry Brick Walls for Tornado Loadings Presentation to United States Nuclear Regulatory Commission (NRC)
Rockville, MD May 6, 2009 May 6, 2009 1
Duke Participants Stephen Newman, Regulatory Compliance Clifford Davis, Major Projects Group Lawrence Llibre, Major Projects Group Bud Starnes, Major Projects Group May 6, 2009 2
Agenda
Introductions
Purpose of Meeting Brief Description of Natural Phenomenon Barrier System (NPBS) Modifications Description of Fiber-Reinforced Polymer (FRP) System Application FRP Licensing Actions Completed to Date Description and Discussion of LAR: Analytical Method for Evaluating Walls and Design of FRP Description and Discussion of LAR: Application of Performance Testing Program to Oconee Analysis and Design Proposed LAR Schedule Closing Remarks May 6, 2009 3
Purpose of Meeting Provide brief overview of Natural Phenomenon Barrier System (NPBS) Project modifications.
Describe proposed use of Fiber-Reinforced Polymer (FRP)
System as it relates to NPBS modifications.
Review completed licensing actions pertaining to use of FRP at Oconee.
Provide overview of, and obtain NRC feedback on, draft License Amendment Request for use of FRP on Oconee brick masonry walls.
May 6, 2009 4
Overview of NPBS Modifications May 6, 2009 5
Overview of NPBS Modifications Unit 3 Control Room North Wall (Completion: May 2009) fortify wall to address tornado wind & differential pressure loads and tornado-generated missiles install structural steel barriers to resist tornado-induced differential pressure, wind, and missile loads Standby Shutdown Facility (SSF) Systems Located within Units 1, 2, and 3 West Penetration and Cask Decontamination Tank Rooms improve protection of SSF-related cabling and piping from tornado wind & differential pressure loads and tornado-generated missiles apply FRP system directly to existing masonry construction (differential pressure) and install structural siding/girts and steel barriers (wind and missiles)
May 6, 2009 6
Overview of NPBS Modifications SSF Diesel Fuel Tank Vents (Completed) protect tank vents from tornado wind load and tornado-generated missiles install new tornado-resistant vent SSF Trench Cover (Completed) protect elevated portion of cable / pipe trench from tornado wind
& differential pressure loads and tornado-generated missiles install reinforced concrete covers over affected portion of trench Units 1, 2, and 3 Borated Water Storage Tanks (BWSTs) improve protection of critical volume of each units BWST from tornado-generated missiles install structural steel barrier wall with independent foundation May 6, 2009 7
Description of FRP System Application Application: Bond-critical application for flexural strengthening of non-load bearing, infill masonry walls to resist higher design loads.
Note: Application is similar to traditional technique of employing externally bonded steel plates.
Loading Condition: Uniform pressure on masonry wall resulting from tornado-induced differential pressure causing tensile stresses in FRP system.
Note: FRP system will not be relied upon as a compressive reinforcement.
May 6, 2009 8
Description of FRP System Application Location: Exterior surfaces of Units 1, 2, and 3 West Penetration Room and Cast Decontamination Tank Room walls.
Note: FRP system will be shielded from sunlight (i.e.,
UV) by structural siding.
Environment: Ambient temperature and humidity conditions associated with local climate.
Note: FRP system will not be located in a high radiation environment or exposed to high temperature gas and/or liquid. FRP system meets plant Fire Protection requirements.
May 6, 2009 9
Proposed Use of FRP System May 6, 2009 10
Proposed Use of FRP System Typical FRP Application (Brick Masonry Wall shown)
May 6, 2009 11
FRP Licensing Actions Completed to Date LAR No. 2006-006 and associated Duke responses to NRCs RAIs for ONS block masonry walls.
Duke submittals communicated to NRC by letters dated 6/1/2006, 3/14/2007, 10/8/2007, and 10/30/2007.
Duke methodology for evaluating walls and designing for FRP strengthening based on conventional design techniques, codes, and standards for masonry, and supported by available research.
Safety Evaluation by NRC Reference correspondence in letters from NRC to Duke dated 2/21/2008 and 3/26/2008.
NRC accepted Dukes methods for design, qualification, installation and inspection, and in-service surveillance, and accepted the FRP system for strengthening block masonry walls to withstand tornado differential pressure loads.
May 6, 2009 12
Description & Discussion of LAR:
Analytical Method for Evaluating Brick Walls and Design of FRP Enclosure 5 provides detailed discussion of analytical methodology and design of FRP strengthening.
Analytical methodology for brick walls is identical to that used for block walls.
Attachment 5.1 (Flowchart): Overview of analytical methodology.
Attachment 5.2: Discussion of application of Duke-sponsored Performance Testing Program to Oconee analysis and design.
Attachment 5.3 (Spreadsheet): Example of analytical methodology using Performance Testing Program specimens.
(Same method used by Dukes vendor to design Oconee walls.)
Attachment 5.4: Performance Testing Program report by Constructed Facilities Laboratory, NCSU.
Attachment 5.5: Independent review of Performance Testing Program and analytical methodology by Dr. Nigel Priestley (includes resume' and biographical sketch).
May 6, 2009 13
Applicable Codes and Standards American Concrete Institute (ACI)
ACI 440.2R-02, Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures ACI 531-79, Building Code Requirements for Concrete Masonry Structures International Code Council (ICC)
ICC AC125, Interim Criteria for Concrete and Reinforced and Unreinforced Masonry Strengthening Using Fiber-Reinforced Polymer (FRP) Composite Systems, June 2003 May 6, 2009 14
Applicable Codes and Standards American Society for Testing and Materials (ASTM)
ASTM D3039, Standard Test Method for Tensile Properties of Polymer Matrix Composite Materials ASTM D4541, Standard Test Method for Pull-Off Strength of Coatings Using Portable Adhesion Testers Other ASTM standards will be used to qualify FPR materials in the Commercial Grade Dedication process, based on AC125 and ACI-440.2R guidance.
May 6, 2009 15
Description & Discussion of LAR:
Application of Performance Testing Program to Oconee Analysis and Design Performance Testing Program (Ref. Att. 5.4)
CFL is only US facility certified to perform FRP-strengthened wall testing Meeting with NRC to review proposed Testing Program on June 4, 2008 NRC visit to CFL to witness wall test on July 10, 2008 Follow-up conference call between NRC and Duke on July 22, 2008 Table 13: Summary of Experimental Results [CFL p.179]
Materials and Construction of Test Specimens (Ref. Att. 5.2)
Masonry, Brick, Mortar, and Reinforcing (p. 2)[CFL pp. 22-30]
Reinforced Concrete Frames (pp. 2-3)[CFL pp. 20-22]
Aspect Ratios (p. 3)[CFL pp. 182-183]
Boundary Conditions of Masonry Walls at RC Frame Interface (p.
3)[CFL p. 42]
FRP Composite System Materials and Properties (p. 3)[CFL pp. 30-32]
FRP Coverage (p. 4)[CFL pp. 184-185]
Application of Uniform Load (p. 4)[CFL pp. 43-44]
May 6, 2009 16
Performance Testing Program:
Oconee Unit 2 Auxiliary Building Stairwell Prism Sample May 6, 2009 17
Description & Discussion of LAR:
Application of Performance Testing Program to Oconee Analysis and Design Behavior of Walls (Ref. Att. 5.2)
Behavior of Double-Wythe Brick Walls (p. 4)[CFL p. 182]
Behavior of Single-Wythe Brick Walls (p. 5)[CFL p. 182]
Effect of Overlapping FRP onto RC Frame (p. 5)[CFL p. 181]
Failure Modes (p. 5)[CFL p. 47]
In-Plane Reactions due to Out-of-Plane Loading (p. 5)
Effect of Inter-Story Drift on In-Fill Masonry Walls (p. 5)
Analysis and Design of FRP for Oconee Walls (Ref. Att.
5.2)
Environmental-Reduction Factor, CE (p. 6)
Bond-Dependent Coefficient for Flexure, km (p. 6)[Priestley p. 4]
Reinforcement Ratio, f (p. 6)[CFL p. 116][Priestley p. 3]
FRP Reinforcement Index, f (p. 6)[CFL p. 116][Priestley p. 6]
May 6, 2009 18
Description & Discussion of LAR:
Application of Performance Testing Program to Oconee Analysis and Design Summary of Performance Testing and Application to Oconee Analysis & Design Test Specimen construction is representative of Oconees Auxiliary Building brick wall construction.
Performance Testing adequately modeled aspect ratios and simulated behaviors of Auxiliary Building brick walls subjected to tornado-induced differential pressure loading. (Ref.
Priestley Section 3, pp. 7-10)
Shear Restraints will be designed for Oconee brick walls to resist sliding shear at top and side boundaries (Ref. CFL Fig.
137, p. 141). Shear restraints will also be installed on Oconees block walls at top boundary.
Analytical Methodology is reliably predictable and conservative. (Ref. Priestley Section 2, pp. 2-7)
May 6, 2009 19
Proposed LAR Schedule Submit LAR June 2009 Approval Requested June 2010 May 6, 2009 20
Closing Remarks Dukes proposed change to utilize FRP on certain masonry brick walls, for tornado differential pressure only, is safe and satisfies this portion of the walls tornado design criteria.
Questions Action Items NRC feedback Duke revision to draft LAR May 6, 2009 21