American Institute of Steel Construction Charlie Carter Vice President and Chief Structural Engineer

ANSI/AISC N 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 , Specification for Structural Steel Building – Revisions to load combinations involving wind loads to align with ASCE/SEI 7- 10, 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 N 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 – Load Combinations – Compactness Analysis Requirements – Effective Stiffness – Geometric and material properties – Accidental Thermal Condition Design for Tension Design for Compression Design for out-of-plane Flexure Design for in-plane and out-of-plane shear Design for combined forces Connection Design Design for impactive and impulsive loads