目的 临界安全是设计易裂变核材料UO2粉末运输容器时需考虑的重点,需要对其在正常运输和运输事故条件下容器的临界安全进行分析,确保容器的设计符合相应法规和标准对临界安全的要求。方法 基于国际临界安全手册中与本案例类似的实验案例,利用蒙特卡罗方法计算本案例的次临界限值,并对孤立货包和阵列货包在正常运输和运输事故条件下的反应性进行计算。结果 经计算,孤立货包在正常运输和运输事故条件下的最大有效增值系数为0.300 70,阵列货包在正常运输和运输事故条件下的最大有效增值系数为0.543 20。结论 二氧化铀粉末运输容器在正常运输和运输事故下的反应性均小于次临界限值,其临界安全指数（CSI）为0,表明此容器设计满足要求。
Abstract
Criticality safety is a primary concern in designing transport containers for fissile UO2 powder. Therefore, it is necessary to analyze the criticality safety of containers under both normal conditions and accident scenarios during transport, ensuring that the design complies with all applicable regulatory and standard requirements for criticality safety. Based on experimental cases from the International Handbook of Criticality Safety similar to the case at hand, the Monte Carlo method was employed to calculate the subcritical limit for this case. Reactivity calculations were then performed for both single and array packages under normal and accident conditions during transport. The maximum keff of the single package was 0.303 87 under normal transport and accident conditions, while that of the array package was 0.543 20. The reactivity of the uranium dioxide powder transport container is below the subcritical limit under both normal and accident conditions and its Criticality Safety Index (CSI) is 0, meeting the design requirements.
关键词
放射性物品运输 /
二氧化铀粉末 /
运输容器 /
临界安全
Key words
radioactive material transport /
uranium dioxide powder /
transport container /
criticality safety
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基金
中国辐射防护研究院青年基金（YQ24000517）
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