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NUCLEAR CRITICALITY SAFETY OF PIPES NETWORKS CONTAINING URANIUM

机译:含有铀的管道网络的核临界安全性

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In nuclear facilities, the transfer of fissile material in solution, gas or powder forms between process stages requires many transfer lines (called "pipes" in this paper) which may be laid out into bundles or networks. In Nuclear Criticality Safety evaluations, it is usual to assimilate such networks as a unique cylinder which area bounds the sum of the surface of pipes making up the network. However, even if this geometric simplification appears intuitively safe, it is not conservative in all cases. The aim of this paper is therefore to explore the validity and limitations associated to the assessment of pipes networks by a unique cylinder. This paper presents the impact on the keff value of a detailed modeling of a pipes network compared to a unique cylinder. Variables of interest considered in such calculations are pipes diameter, composition, pitches and layout. Fissile media taken into account are uranium systems enriched from 5 % to 93.5 % in ~(235)U. Then, the impact on reactivity of pipes material, such as stainless steel or plastic, is discussed and the minimal or maximal safe thickness of material has been determined. Finally, this paper provides guidance on the nuclear criticality safety assessment of pipes networks for uranium systems.
机译:在核设施中,在工艺阶段之间的溶液,气体或粉末形式的裂变材料的转移需要许多转移线(在本文中称为“管道”),其可以被布置成捆绑或网络。在核临界安全评估中,通常将这些网络作为一种独特的圆柱体,该网络界定了构成网络的管道表面的总和。但是,即使这种几何简化看起来直观地安全,在所有情况下都不是保守的。因此,本文的目的是探讨与独特的气缸评估管道网络相关的有效性和限制。与独特的汽缸相比,本文对管道网络的详细建模的影响的影响。在这种计算中考虑的兴趣的变量是管道直径,组成,俯仰和布局。考虑的裂变培养基是铀体系,〜(235)u富含5%至93.5%。然后,讨论了对管材材料的影响,例如不锈钢或塑料,并且已经确定了材料的最小或最大安全厚度。最后,本文为铀系统管道网络的核关键性安全评估提供了指导。

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