American Institute of Steel Construction Charlie Carter Vice President and Chief Structural Engineer ANSI/AISC N690-12 Specification for Safety-Related Steel Structures for Nuclear Facilities • The current specification was recently completed and replaces the 2006 edition. • Major changes include: – A general update to remain aligned with ANSI/AISC 360-10, Specification for Structural Steel Building – Revisions to load combinations involving wind loads to align with ASCE/SEI 710, Minimum Design Loads for Buildings and Other Structures – Revisions to chapter on Fabrication and Erection – A new chapter on Quality Control and Quality Assurance ANSI/AISC N690-12 Specification for Safety-Related Steel Structures for Nuclear Facilities • The committee has just started the next code cycle and is evaluating prospective changes for the 2017 edition. • A special Supplement dealing with composite, modular wall construction is currently under development and will be issued prior to the next edition of N690 to address the recommendations of NESCC – Concrete Codes and Standards for Nuclear Power Plants: Recommendations for Future Development. (June 2011) Adhoc Subcommittee on Modular Composite Construction Subcommittee on Modular Composite Construction • Task: Development of Design, Analysis, Materials, Fabrication, and Erection of SC structures • Contributors: Design companies, NSSS vendors, utilities, fabricator, and regulator • Deliverable: Appendix N9 to N690 • Progress: approximately 90% of the subcommittee work is complete • Schedule: – Draft for Main Committee ballot: July 2013 – Final ANSI approved and released document: May 2015 Highlights of Appendix N9: Specification for Steel-Plate Composite (SC) Walls in Safety-Related Structures for Nuclear Facilities • Design Requirements • Design for Compression – Load Combinations • Design for out-of-plane – Compactness Flexure • Analysis Requirements • Design for in-plane and – Effective Stiffness out-of-plane shear – Geometric and material • Design for combined properties forces – Accidental Thermal • Connection Design Condition • Design for impactive • Design for Tension and impulsive loads