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首页> 外文会议>INMM annual meeting >A Monte Carlo Evaluation of the Performance of Non Destructive Assay Systems for Quantitative Measurements of Enriched Uranium Metal Turnings
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A Monte Carlo Evaluation of the Performance of Non Destructive Assay Systems for Quantitative Measurements of Enriched Uranium Metal Turnings

机译：蒙特卡洛评估富铀金属车削定量测量的非破坏性分析系统的性能

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Current methods for closing material balances in many manufacturing areas where uranium metal turnings, scrap, chips and small metal pieces are produced can be time consuming and incurs high labor costs. A timely closing of the material balance and a substantial cost saving may be achieved by installing a nondestructive assay system that is capable of rapidly quantifying the amount of uranium contained in the material balance unit. A Monte Carlo evaluation was performed to determine the measurement performance of several nondestructive assay (NDA) techniques that can be applied to this specific situation. The results of the Monte Carlo evaluation can be used to decide whether to implement NDA technology and if so, which NDA system to implement. An additional practical application of a measurement technology in manufacturing operations is to supplement the MC&A methodology of Process Monitoring. Several different NDA techniques were modeled with the Monte Carlo N-Particle eXtended (MCNPX) code. The techniques modeled include delayed neutron examination, active coincidence counting, and active multiplicity. All three of these techniques use an interrogation source to induce fissions in the sample. Measurements of the delayed neutrons or induced fission neutrons are used to quantify the uranium mass in an unknown sample. Past measurement experience has shown that these measurement techniques work very well for the assay of typical uranium items. Unfortunately, the measurement of uranium metal turnings is more complicated than the typical case because the metallic constituents are intermixed with lubricant. The lubricant moderates neutrons which causes a change in the neutron signature from the material. The Monte Carlo evaluation consisted of modeling many different possible uranium masses with varying amounts and distributions of lubricant. Techniques for measuring the amount of neutron moderation were built into the Monte Carlo models to correct for changes in the neutron signature from moderation by the lubricant. The Monte Carlo modeling indicated that by combining the neutron signature and information about the amount of moderation the best assay results were obtained. This paper will describe the MCNPX modeling that was done and discuss the results.
机译：在许多生产铀金属车削，废料，切屑和小金属片的制造领域，当前关闭物料平衡的方法可能很耗时，并且会导致高昂的人工成本。通过安装能够快速量化物料平衡单元中所含铀量的非破坏性测定系统，可以及时关闭物料平衡并节省大量成本。进行了蒙特卡洛评估，以确定可以应用于此特定情况的几种非破坏性测定（NDA）技术的测量性能。蒙特卡洛评估的结果可用于决定是否实施NDA技术，如果实施，则决定实施哪种NDA系统。测量技术在制造操作中的另一项实际应用是对过程监控的MC＆A方法进行补充。 使用蒙特卡洛N粒子扩展（MCNPX）代码对几种不同的NDA技术进行了建模。建模的技术包括延迟中子检查，主动重合计数和主动多重性。所有这三种技术都使用询问源在样品中诱发裂变。延迟中子或诱发裂变中子的测量用于量化未知样品中的铀质量。过去的测量经验表明，这些测量技术对典型铀项目的分析非常有效。不幸的是，铀金属车削的测量比典型情况更为复杂，因为金属成分与润滑剂混合在一起。润滑剂可缓和中子，从而引起材料中子特征的变化。 蒙特卡洛评估包括对许多不同的铀质量进行建模，这些铀质量具有不同的润滑剂量和分布。蒙特卡洛模型中内置了用于测量中子缓和量的技术，以校正由于润滑剂的缓和而引起的中子特征变化。蒙特卡洛模型表明，通过结合中子签名和有关调节量的信息，可以获得最佳的测定结果。本文将描述已完成的MCNPX建模并讨论结果。

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