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
This International Standard 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. differentcalculation schemes, see Annex B).The critical values defined in this International Standard are the lowest of those calculated by each of these calculation schemes and accepted as credible.The values in this International Standard are reference values and not absolute critical values.
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