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Komeda, Masao; Maeda, Makoto; Furutaka, Kazuyoshi; Tobita, Hiroshi; Hattori, Kentaro; Shimofusa, Taichi; Ozu, Akira; Kureta, Masatoshi
Proceedings of INMM 57th Annual Meeting (Internet), 10 Pages, 2016/07
We are working on the development of a non-destructive assay (NDA) measurement system using the Fast Neutron Direct Interrogation (FNDI) method. The FNDI method is a kind of active neutron technique and can measure the total amounts of fissile materials (U-235, Pu-239, Pu-241). We have already carried out design analyses of an NDA measurement system for measuring the debris assuming use of the Three Mile Island (TMI) canister model. The result was presented at the Institute of Nuclear Materials Management (INMM) 56th Annual Meeting. Since then, we have modified the design of the NDA measurement system for the fuel debris and canister models at 1F. In this paper, we provide the calculation and evaluation results using the modified NDA measurement system. Moreover, we provide analytical investigations of the influence of fuel debris including high fissile material content on measurements.
Maeda, Makoto; Furutaka, Kazuyoshi; Kureta, Masatoshi; Ozu, Akira; Tobita, Hiroshi; Komeda, Masao; Hattori, Kentaro
Kaku Busshitsu Kanri Gakkai (INMM) Nihon Shibu Dai-36-Kai Nenji Taikai Rombunshu (Internet), 9 Pages, 2015/12
Fukushima Daiichi Nuclear Disaster in March 11th in 2011 is considered to produce fuel debris. It is difficult to measure nondestructively the amount of fissile materials in the fuel debris since the constituents of the debris are unknown and it may contain various materials such as water, metal, and even neutron absorber. A fast neutron direct interrogation (FNDI) method, which has been developed for long years to measure uranium bearing wastes drums, can measure an amount of nuclear materials regardless of a matrix of the wastes drums. We have studied nondestructive assay for nuclear materials in fuel debris by using the FNDI method. In this paper, we report on a design study of a nondestructive measurement system for debris canister and results of the investigation on the applicability of the FNDI method to the fuel debris containing various materials using Monte Carlo simulations.
Maeda, Makoto; Furutaka, Kazuyoshi; Kureta, Masatoshi; Ozu, Akira; Tobita, Hiroshi; Komeda, Masao; Hattori, Kentaro
Proceedings of INMM 56th Annual Meeting (Internet), 8 Pages, 2015/07
In Japan Atomic Energy Agency (JAEA), it has been started that investigation on applicability of Fast Neutron Direct Interrogation (FNDI) method to fuel debris. FNDI method is expected to be promising non-destructive Assay (NDA) technique which measures total amounts of fissile materials. In this presentation, we report on basic model of non-destructive measurement system designed by using Monte Carlo Code PHITS, the effect of the matrix in debris canister on FNDI method evaluated by using Monte Carlo Code MVP and four dimensional (4 D) visualization results of neutron flux obtained by using visualization tool we have newly developed.
Maeda, Makoto; Furutaka, Kazuyoshi; Kureta, Masatoshi; Ozu, Akira; Tobita, Hiroshi; Haruyama, Mitsuo; Komeda, Masao; Hattori, Kentaro
no journal, ,
We have developed the fast neutron direct interrogation, FNDI, method which measures the total amount of the fissile in fuel debris expected as promising nondestructive measurement technology. And we started examination about the possibility of whether to be applicable to measurement of the amount of fissile in the container which stored the fuel debris. In this report, the progress about the basic design of non-destructive measurement system which has been designed by using Monte Carlo code PHITS and newly developed visualization tools, and also the 4D visualization results of neutron diffusion characteristic in the system are reported.
Kureta, Masatoshi; Maeda, Makoto; Ozu, Akira; Furutaka, Kazuyoshi; Tobita, Hiroshi; Haruyama, Mitsuo; Komeda, Masao; Hattori, Kentaro
no journal, ,
The plan about the material accountancy or measurement of fuel debris which occurs in a Fukushima Daiichi Nuclear Power Plant accident was not decided. It will be determined by the stakeholder in the future. We have developed the fast neutron direct interrogation, FNDI, method which measures the total amount of the fissile expected as promising nondestructive measurement technology. And we started examination about the possibility of whether to be applicable to measurement of the amount of fissile in the container which stored the fuel debris. We reports the short-term plan and the progress about the influence which composition of fuel debris has on the neutron measurement result by the FNDI method.
Maeda, Makoto; Furutaka, Kazuyoshi; Kureta, Masatoshi; Ozu, Akira; Tobita, Hiroshi; Komeda, Masao; Hattori, Kentaro
no journal, ,
no abstracts in English
Maeda, Makoto; Furutaka, Kazuyoshi; Kureta, Masatoshi; Ozu, Akira; Komeda, Masao; Tobita, Hiroshi; Hattori, Kentaro
no journal, ,
Fukushima Daiichi Nuclear Accident occurred in March 2011 is considered to produce fuel debris. Down-selection of technology for material accountancy of fuel debris was conducted as a part of collaborative research between Japan Atomic Energy Agency and United States Department of Energy. JAEA has investigated applicability of three down-selected technologies to fuel debris. In this research, we report on a simulation results of the investigation on the applicability of fast neutron direct interrogation method which is one of down-selected technologies to the fuel debris.
Komeda, Masao; Maeda, Makoto; Furutaka, Kazuyoshi; Tobita, Hiroshi; Hattori, Kentaro; Shimofusa, Taichi; Ozu, Akira; Kureta, Masatoshi
no journal, ,
This report describes applicability evaluation results of active neutron technique (AN) for characterization study of candidate technologies for nuclear material quantification in fuel debris at Fukushima Daiichi Nuclear Power Station. In this characterization study, we used the Fast Neutron Direct Interrogation (FNDI) method which is one of the active neutron methods. We had performed simulation studies of the FNDI measurement system for measuring the debris using the Three Mile Island (TMI) canister model. Since then, we have modified the design of the FNDI measurement system in order to apply the new canister model, and carried out simulations of a common set of debris models. As the result of the simulations, it has been found that the fissile mass can be measured with an error of less than 20% under the condition in which B-10 density is less than 0.04 wt%.