This International Standard specifies areas that are important to study when analysing potential criticalityaccidents. NOTE1 It is important that a criticality accident analysis be performed each time a criticality accident is consideredcredible, due either to criticality contingencies (double batching, procedural violations, etc.) or to the failure of safetyprovisions (effectiveness of neutron absorber reduced by fire, etc.). NOTE2 It is important that the criticality safety specialist be mindful that the process of evaluation developed in thisInternational Standard does not address the unforeseen, since any actually occurring criticality accident will probably resultfrom a scenario not envisioned or from failure to comply with prevailing regulations. This International Standard does not address detailed administrative measures, for which the responsibility lieswith the public authorities, nor does it deal with criteria used to justify the accident criticality analysis of a nuclear facility. This International Standard does not apply to nuclear power plants.