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A Proposed method for integrating the PNAR, TN, and CIPN techniques for the non-destructive assay of used nuclear fuel assemblies

PNAR、TN及びCIPNを統合する新たな測定方法の提案

Bolind, A.

Bolind, A.

米国DOEが進めているNGSIでの「使用済燃料のNDAプロジェクト」では、プルトニウム及びウランの核分裂性核種量の測定を目指して、14の測定技術についての検討を進めている。これらの測定技術の中に、PNAR(Passive Neutron Albedo Reactivity)法、TN(Total Neutron counting)法、CIPN(Cf-252 Interrogation Prompt Neutron detection)法が含まれているが、これらの技術は、核分裂性核種による中性子増倍という同じ物理現象を基礎としているため、互いに独立的ではなく、燃焼度,初期濃縮度,冷却時間等の他の情報が与えられないと、核分裂核種を測定するうえでの有効な統合ができない。筆者はこの問題を解決する有効な方法を提案しており、その概要について発表するとともに、保障措置にどのように使えるかについて紹介する。

In the first phase of its Spent Fuel Nondestructive Assay project, the Next Generation Safeguards Initiative (NGSI) of the U.S. Department of Energy (DOE) examined 14 NDA techniques for measuring the Pu and/or fissile content of used nuclear fuel assemblies, including the 3 techniques of passive neutron albedo reactivity (PNAR), total neutron counting (TN), and californium-252 interrogation with prompt neutron detection (CIPN). These 3 techniques were not integrated with each other because they all rely on the same physics of the multiplication of neutrons by fissile material. The 3 techniques also have a common problem, though. None of them can independently determine the fissile content, without additional information from either the reactor operator or some other NDA technique regarding the burnup, initial enrichment, and/or cooling time of the fuel assembly. In a recent journal article, the author has proposed a new way to integrate these 3 techniques to overcome this problem. In this INMM paper, the author will summarize this new method and describe how it can be applied to safeguards practice.

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