"R" in the numeric designation signifies that the 1996 standard was reaffirmed (recertified) as an American National Standard in 2006. No changes can be made to a standard during reaffirmation.
This standard sets forth a series of design conditions and functional requirements for the design of fuel assemblies for light-water-cooled commercial power reactors. It includes specific requirements for design, as well as design criteria to ensure adequate fuel assembly performance. The standard establishes a procedure for performing an evaluation of the mechanical design of fuel assemblies.