ISO 16117:2013提供了一种估算假定临界事故裂变次数合理最大值的方法。 与假设临界事故相关的裂变数估算会影响事故应急计划和响应，因为它用于估算辐射剂量和放射性物质释放。 ISO 16117:2013不适用于可能发生可信临界事故的核设施、工厂、实验室、裂变材料的储存和运输（但不适用于核电反应堆堆芯）。

ISO 16117:2013 provides a methodology to estimate a reasonably maximal value of the number of fissions of a postulated criticality accident. The fission number estimate, associated with its postulated criticality accident, impacts the accident emergency planning and response because it is used for the estimation of radiation doses and of radioactive materials release. ISO 16117:2013 does apply to nuclear facilities, plants, laboratories, storage, and transportation of fissile material (but not to nuclear power reactor cores) where a credible criticality accident may occur.