The Specification for Safety-Related Steel Structures for Nuclear Facilities (ANSI/AISC N690-18), dated June 28, 2018, includes both the load and resistance factor design and allowable strength design methods of design, and is a supplement to the 2016 Specification for Structural Steel Buildings (ANSI/AISC 360-16). The document applies to the design of safety-related steel structures and steel elements in nuclear facilities.

ANSI/AISC N690-12 with ANSI/AISC N690s1-15 PDF, the immediate past version of this document was a supplement to the 2010 Specification for Structural Steel Buildings. It incorporated Supplement No. 1 dated August 11, 2015, which consisted of a new Appendix on steel-plate composite walls and associated revisions. This specification replaced ANSI/AISC N690-06. It is superseded by the 2018 version.