ISO 11311:2011 核临界安全 反应堆外均匀钚-铀氧化物燃料混合物的临界值
标准编号：ISO 11311:2011
中文名称：核临界安全 反应堆外均匀钚-铀氧化物燃料混合物的临界值
英文名称：Nuclear criticality safety — Critical values for homogeneous plutonium-uranium oxide fuel mixtures outside of reactors
发布日期：2011-07
标准范围
ISO 11311:2011根据计算临界值的代码间比较，规定了均质水慢化钚-铀氧化物混合物的通用参考临界值（其中有效中子倍增因子keff等于1）。它适用于核反应堆外未经辐照的混合铀-钚氧化物（MOX）的运行。由于缺乏MOX燃料的关键实验，这些系统的经典验证方法是困难的。通过计算代码和核数据库的不同组合（即不同的计算方案）来评估同位素组成、水反射厚度和氧化物密度方面的各种参考系统。ISO 11311:2011中定义的临界值是这些计算方案中每一种计算的最低值，并被认为是可信的。ISO 11311:2011中的值是参考值，而不是绝对临界值。
ISO 11311:2011 specifies common reference critical values (of which the effective neutron multiplication factor, keff, is equal to 1) for homogeneous water-moderated plutonium-uranium oxide mixtures based on an inter-code comparison of calculated critical values.It is applicable to operations with unirradiated mixed uranium-plutonium oxide (MOX) outside nuclear reactors.A classical validation approach for these systems is difficult because of the paucity of critical experiments for MOX fuel.Various reference systems, in terms of isotopic compositions, thicknesses of water reflection, and densities of oxide are evaluated by different combinations of calculation codes and nuclear data libraries (i.e. different calculation schemes).The critical values defined in ISO 11311:2011 are the lowest of those calculated by each of these calculation schemes and accepted as credible.The values in ISO 11311:2011 are reference values and not absolute critical values.
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