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論文

Neutron resonance transmission analysis for measurement of nuclear materials in nuclear fuel

土屋 晴文; 北谷 文人; 藤 暢輔; Paradela, C.*; Heyse, J.*; Kopecky, S.*; Schillebeeckx, P.*

Proceedings of INMM 59th Annual Meeting (Internet), 6 Pages, 2018/07

In fields of nuclear safeguards and nuclear security, non-destructive assay (NDA) techniques are needed in order to quantify special nuclear materials (SNMs) in nuclear fuels. Among those techniques, active NDA ones would be preferable to passive ones. One candidate of active NDA techniques is neutron resonance transmission analysis (NRTA). In fact, experiments done at GELINA have shown that NRTA has high potential enough to quantify SNMs in complex materials. Currently, such a NRTA system requires a large electron accelerator facility to generate intense neutron sources. In other words, it is very difficult to perform NRTA at various facilities that need to measure SNMs. Thus, downsizing a NRTA system would be one solution of its difficulty. In order to realize a compact NRTA system, we develop a prototype with a D-T neutron generator that has a pulse width of 10 $$mu$$s. For this aim, numerical calculations to optimize the compact NRTA system were done. In addition, NRTA measurements with simulated fuel pins were made at neutron time-of-flight facilities such as GELINA. In this presentation, we present results of the numerical calculations and the experimental results. On the basis of those results we discuss a future prospect of a compact NRTA system that would be applicable to SNM quantification. This research was implemented under the subsidiary for nuclear security promotion of MEXT.

論文

Development of active neutron NDA system for nuclear materials

藤 暢輔; 大図 章; 土屋 晴文; 古高 和禎; 北谷 文人; 米田 政夫; 前田 亮; 小泉 光生; Heyse, J.*; Paradela, C.*; et al.

Proceedings of INMM 59th Annual Meeting (Internet), 9 Pages, 2018/07

Nuclear material accountancy is of fundamental importance for nuclear safeguards and security. However, to the best of our knowledge, there is no established technique that enables us to accurately determine the amount of Special Nuclear Materials (SNM) and Minor Actinides (MA) in high radioactive nuclear materials. Japan Atomic Energy Agency (JAEA) and the Joint Research Centre (JRC) of the European Commission Collaboration Action Sheet-7 started in 2015. The purpose of this project is to develop an innovative non-destructive analysis (NDA) system using a D-T pulsed neutron source. Active neutron NDA techniques, namely Differential Die-Away Analysis (DDA), Prompt Gamma-ray Analysis (PGA), Neutron Resonance Capture Analysis (NRCA), Neutron Resonance Transmission Analysis (NRTA) and Delayed Gamma-ray Analysis (DGA) have been studied and developed. The different methods can provide complementary information which is particularly useful for quantification of SNM and MA in high radioactive nuclear materials. The second phase of the project has started. In the second phase, we will continue to conduct additional research to improve the methodology and develop an integrated NDA system. This presentation gives an overview of the project and the NDA system and reports the recent results. This research was implemented under the subsidiary for nuclear security promotion of MEXT.

論文

Development of detection and measurement technologies for Nuclear Non-proliferation and Security at JAEA

小泉 光生; 瀬谷 道夫; 富川 裕文; 堀 雅人; 直井 洋介

Proceedings of INMM 59th Annual Meeting (Internet), 8 Pages, 2018/07

原子力機構では、文部科学省の核セキュリティ強化等推進事業費補助金の下、核不拡散・核セキュリティのための非破壊分析技術開発を進めている。「核蛍光非破壊測定技術実証試験」では、重遮蔽中に隠蔽された核物質を検知する技術開発を行っている。「アクティブ中性子非破壊測定技術の開発」では、DT中性子源からの中性子を利用して低線量から高線量までの核物質等を分析するためのアクティブ法の技術開発を行っている。また、「先進的プルトニウムモニタリング技術開発」では、高い放射能を持つPu溶液の非破壊・継続的監視、検認を行うための技術開発を進めている。本発表では、補助金事業における核検知・測定技術開発プロジェクトの概略を紹介する。

論文

Feasibility study of technology for Pu solution monitoring including FP; Development of gamma spectra detector for high active liquid waste

関根 恵; 松木 拓也; 所 颯; 蔦木 浩一; 北尾 貴彦; 中村 仁宣; 富川 裕文

Proceedings of INMM 59th Annual Meeting (Internet), 10 Pages, 2018/07

再処理施設においては、プルトニウム(Pu)モニタリングのさらなる適用拡大を図るため、核分裂生成物(FP)を含むPu溶液中のPu量を測定可能な検出器開発が必要である。Puモニタリングに適用可能な$$gamma$$線を調べるため、高線量下、広範囲のエネルギーが測定可能かつ高い分解能を持つCe:GAGG (Ce:Gd$$_{3}$$Al$$_{2}$$Ga$$_{3}$$O$$_{12}$$)シンチレータを装備した検出器(対象:高放射性廃液)を新たに設計・開発した。その検出器を用いて東海再処理施設の高放射性廃液のコンクリートセル内で、同廃液に対し800keV以上の$$gamma$$線スペクトル測定を実施したところ、Eu-154由来と考えられるピークを検出した。この測定結果は、中性子の測定結果とMCNPシミュレーションを組み合わせ、Puモニタリング技術開発へ適用していく。本発表では、検出器の選定,設計、$$gamma$$線スペクトル測定結果、Puモニタリングへの適用性評価について報告する。本技術開発は、文部科学省核セキュリティ補助金事業の一環として実施している。

論文

Discussion of effective insider threat mitigation method at reprocessing plant

中村 仁宣; 北尾 貴彦; 山田 博之; 河野 壮馬; 木村 隆志; 田崎 隆

Proceedings of INMM 59th Annual Meeting (Internet), 9 Pages, 2018/07

To reduce security risks by outsider and insider, JAEA is on-going to raise the security level in accordance with the Japanese domestic regulation for reprocessing plant and through constant voluntary improvements. In the reprocessing plant, since a large amount and several types of nuclear material (NM) are handled, the effective physical protection measures have to be considered them for the unauthorized removal and sabotage appropriately. For the insider, since effective and timely detection manner is applied to a part of inner areas and it seems to be very difficult to doubt our employee at the viewpoint of common sense, we are thinking that applying several effective physical protection measures comprehensively as one of rules are very effective. In Tokai Reprocessing Plant, to reduce insider risks, implementation of many security culture efforts for employee and executive managers, implementation of trustworthiness program including observation of acting, implementation of surveillance to inner area, etc. by camera, access control, introduction of two person rule and implementation of planned education and training, etc. are being conducted. By engaging those measures, we believe that the security risks by insider can be minimized. In this paper, we introduce our insider mitigation methods and discuss their effectiveness and best approach for enhancing the security in the reprocessing plant.

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