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Journal Articles

Conceptual study on a novel method for detecting nuclear material using a neutron source

Komeda, Masao; Toh, Yosuke

Annals of Nuclear Energy, 135, p.106993_1 - 106993_6, 2020/01

 Times Cited Count:0 Percentile:100(Nuclear Science & Technology)

This paper presents a conceptual study of a novel active method using a neutron source. The main feature of this new method is the fast rotation of a neutron source in order to derive the fission neutron counts and applying the counts to detect the nuclear material. Irradiating neutrons to a container that involves nuclear material, the measurement data include both neutrons from the neutron source and fission neutrons. However, if the neutron source is rotated quite fast, the components of the irradiation neutrons and fission neutrons are separated. Since this novel method does not require an expensive D-T tube, this new system is expected to be affordable and easy to assemble.

Journal Articles

Discussion of effective insider threat mitigation method at reprocessing plant

Nakamura, Hironobu; Kitao, Takahiko; Yamada, Hiroyuki; Kono, Soma; Kimura, Takashi; Tasaki, Takashi

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

Journal Articles

Delayed $$gamma$$-ray spectroscopy combined with active neutron interrogation for nuclear security and safeguards

Koizumi, Mitsuo; Rossi, F.; Rodriguez, D.; Takamine, Jun; Seya, Michio; Bogucarska, T.*; Crochemore, J.-M.*; Varasano, G.*; Abbas, K.*; Pedersen, B.*; et al.

EPJ Web of Conferences, 146, p.09018_1 - 09018_4, 2017/09

 Times Cited Count:2 Percentile:9.6

Journal Articles

Nuclear security culture in comparison with nuclear safety culture; Resemblances and differences

Kawata, Norio

Kaku Busshitsu Kanri Gakkai (INMM) Nippon Shibu Dai-36-Kai Nenji Taikai Rombunshu (Internet), 7 Pages, 2015/12

Since the terrorist attacks on the U.S. on September 11th,2001, Nuclear Security has been focused on and treated as a global issue in the international community and it has also been discussed as a real and serious threat to nuclear power plants in the world since The Great East Japan Earthquake in March, 2011. The International Atomic Energy Agency (IAEA) issued a document including Nuclear Security Recommendations (INFCIRC/225/Rev.5) (NSS 13) in the Nuclear Security Series and emphasized the necessity of fostering Nuclear Security Culture. Nuclear Security Culture has been frequently discussed at various kinds of seminars and events. Since the officials in charge of Nuclear Security are familiar with the area of Nuclear Safety, the relationships between Nuclear Safety Culture and Nuclear Security Culture have been the point in controversy. This paper clarifies relevance between Nuclear Safety and Nuclear Security, considers resemblances and differences of their concepts and lessons learned for each culture from nuclear power plant accidents, and promotes deeper understanding of Nuclear Safety and Nuclear Security Culture.

Journal Articles

Current activities and future challenges of FNCA's nuclear security and safeguards project

Senzaki, Masao

Proceedings of INMM 56th Annual Meeting (Internet), 10 Pages, 2015/07

The presentation outlines the role and objectives of Nuclear Security and Safeguards Project (NSSP) as well as FNCA framework and provides activity examples of how NSSP member countries work together to strengthen nuclear security and enhance safeguards effectiveness and raise awareness.

Oral presentation

Anticipations of NRF-based NDA of nuclear material using monochromatic $$gamma$$-ray beams

Seya, Michio; Hajima, Ryoichi*; Hayakawa, Takehito*; Koizumi, Mitsuo

no journal, , 

The NRF-base NDA using monochromatic $$gamma$$-rays would be used in nuclear security for secure detection of NM in thick shield and also for precise checking of interior structures of detected / suspicious objects. This NDA also would be used in nuclear safeguards for precise quantification of U/Pu isotopes in high radiation background, such as spent fuel assemblies / melted fuel debris in a canister. It is also useful for precise measurement of quantities of minor actinide isotopes in ADS (Accelerator Driven Sub-critical System; for transmutation of long-half-life minor actinides (MA)) fuels before and after irradiation in the ADS reactor core. In this presentation, we show actual NRF-NDA methods for these objects.

Oral presentation

Conceptual study of a Pu-burner HTGR with high nuclear proliferation resistance

Goto, Minoru

no journal, , 

We conduct a quantitative evaluation of security, a design of the fuel and the reactor core, a safety evaluation and a fabrication tests of PuO$$_{2}$$-YSZ TRISO fuels with ZrC coating to establish the basic technologies of the plutonium burner HTGR with a high nuclear proliferation resistance. This study is conducted by The University of Tokyo, Japan Atomic Energy Agency, Fuji Electric Co., Ltd., and Nuclear Fuel Industries, Ltd. It was started in FY2014 and will be completed in FY2017. The outline of the study is explained in the presentation.

Oral presentation

Development of nondestructive assay technologies for nuclear nonproliferation and security

Koizumi, Mitsuo; Seya, Michio; Tomikawa, Hirofumi; Hori, Masato; Naoi, Yosuke

no journal, , 

Japan Atomic Energy Agency (JAEA) is developing nondestructive assay (NDA) methods for nuclear nonproliferation and security under the support of Ministry of Education, Culture, Sports, Science and Technology (MEXT). The project under the subsidy of "promotion and strengthening of nuclear security and the other issues" includes projects "Demonstration experiment of nuclear resonance fluorescence NDA" for detection of heavily shielded nuclear material, and "Development of active neutron NDA techniques" for analysis of a low and high radioactive objects containing nuclear materials and the other elements with a DT neutron source. This presentation overviews these projects.

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