This standard is applicable to operations with fissionable materials outside nuclear reactors@ except for the assembly of these materials under controlled conditions@ such as in critical experiments. Generalized basic criteria are presented@ and limits are specified for some single fissionable units of simple shape containing 233U@ 235U@ or 239Pu@ but not for multiunit arrays. Subcritical limits for certain multiunit arrays are contained in ANSI/ANS-8.7-1998 (R2012) [2]. Requirements are stated for validation of any calculation method used in assessing nuclear criticality safety. This standard does not include the details of administrative controls@ the design of process or equipment@ the distribution of instrumentation for process control@ nor detailed criteria to be met in transporting fissionable materials. Guidance for transporting light water reactor (LWR) fuel is contained in ANSI/ANS-8.17-2004 (r2009) [3].