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ANS 2.26

2004 Edition, 2004

Complete Document

categorization of nuclear facility structures, systems, and components for seismic design

Includes all amendments and changes through Reaffirmation Notice , 2017

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Product Details:

  • Revision: 2004 Edition, 2004
  • Published Date: September 12, 2017
  • Status: Active, Most Current
  • Document Language: English
  • Published By: American Nuclear Society (ANS)
  • Page Count: 29
  • ANSI Approved: Yes
  • DoD Adopted: No

Description / Abstract:

This standard provides (a) criteria for selecting the seismic design category1) (SDC) for nuclear facility structures, systems, and components (SSCs) to achieve earthquake safety and (b) criteria and guidelines for selecting Limit States for these SSCs to govern their seismic design. The Limit States are selected to ensure the desired safety performance in an earthquake.


This standard is applicable to the design of SSCs of nuclear facilities. For the purpose of this standard, a nuclear facility is a facility that stores, processes, tests, or fabricates radioactive materials in such form and quantity that a nuclear risk to the workers, to the offsite public, or to the environment may exist. These include but are not limited to nuclear fuel manufacturing facilities; nuclear material waste-processing, storage, fabrication, and reprocessing facilities; uranium enrichment facilities; tritium production and handling facilities; radioactive materials laboratories; and nuclear reactors other than commercial power reactors. (Commercial power reactors are excluded because their seismic design requirements are specified by other American Nuclear Society standards.)

The SSC seismic design categories that this standard establishes shall be used by the facility owner and the facility designer, in conjunction with ANS-2.27, “Criteria for Investigations of Nuclear Materials Facilities Sites for Seismic Hazard Assessments” [2]; ANS-2.29 “Probabilistic Seismic Hazard Analysis” [3]; and American Society of Civil Engineers (ASCE) standard ANSI0ASCE0SEI 43-05, “Seismic Design Criteria for Structures, Systems and Components in Nuclear Facilities” [1].

1) The SDCs used in this standard are not the same as the SDCs referred to in the International Building Code (IBC).