"R" in the numeric designation signifies that the 1983 standard was reaffirmed (recertified) as an American National Standard in 1988,1999 & 2005. No changes can be made to a standard during reaffirmation.
This standard is applicable to operations outside of nuclear reactors with 235U, 233U, 239Pu, and other fissile and fissionable materials in which shielding and confinement are provided for protection of personnel and the public, except the assembly of these materials under controlled conditions, such as in critical experiments. Criteria are provided that may be used for criticality control under these conditions. This standard does not include the details of administrative procedures for control nor details regarding the design of processes and equipment or descriptions of instrumentation for process control.
