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Journal Articles

Removal of fission products in the spent electrolyte using iron phosphate glass as a sorbent

Amamoto, Ippei; Mitamura, Naoki*; Tsuzuki, Tatsuya*; Takasaki, Yasushi*; Shibayama, Atsushi*; Yano, Tetsuji*; Nakada, Masami; Okamoto, Yoshihiro

Proceedings of 13th International Conference on Environmental Remediation and Radioactive Waste Management (ICEM 2010) (CD-ROM), p.503 - 508, 2010/10

The main objective of this development is to recycle the purified eutectic medium of the pyroreprocessing, delaying its disposal for as long as possible. We have introduced the simple filtration method to remove the rare earth element (REE) particles which were formed due to the conversion of REE chlorides to phosphates. Here, the iron phosphate glass is used as a filtration medium for the removal of FP particles. However, some soluble FP such as compounds of alkali-metals, alkaline-earth metals, etc. still remain in the eutectic medium. This time around, on an experimental basis, the iron phosphate glass has been used as a sorbent instead, to remove the soluble FP. We have obtained some positive results and have intention to incorporate it into the spent electrolyte recycle process as a part of the FP separation and immobilization system.

Journal Articles

Fast neutron-$$gamma$$ discrimination on neutron emission profile measurement on JT-60U

Ishii, Keiichi*; Shinohara, Koji; Ishikawa, Masao; Baba, Mamoru*; Isobe, Mitsutaka*; Okamoto, Atsushi*; Kitajima, Sumio*; Sasao, Mamiko*

Review of Scientific Instruments, 81(10), p.10D334_1 - 10D334_3, 2010/10

 Times Cited Count:6 Percentile:31.03(Instruments & Instrumentation)

Journal Articles

Measurement of DT and DD neutrons with a TOF spectrometer for determination of fuel ion density ratio in ITER

Okada, Koichi*; Kondo, Keitaro; Ochiai, Kentaro; Sato, Satoshi; Konno, Chikara; Okamoto, Atsushi*; Kobuchi, Takashi*; Kitajima, Sumio*; Sasao, Mamiko*

Journal of Plasma and Fusion Research SERIES, Vol.8, p.666 - 669, 2009/09

Measurement of fuel ion density ratio, $$n$$$$_{rm D}$$/$$n$$$$_{rm T}$$, is required for burning control on ITER. The measured $$n$$$$_{rm D}$$/$$n$$$$_{rm T}$$ ratio must be fed back in real time. A neutron measurement system to measure $$n$$$$_{rm D}$$/$$n$$$$_{rm T}$$ should be operable at high counting rate. It is estimated that the number of emitted DT neutrons is 200 times higher than that of DD neutrons under the condition of ITER standard operation. A neutron measurement system was developed using a DT/DD generator, where DT neutrons are dominant and DD neutrons are contaminated slightly in the neutron beam. The measurement instrument was a TOF spectrometer. Signals originating from each neutron must be distinguished in order to measure the fuel ratio. We developed a circuit system with discrimination windows to distinguish each signal pulse, and DT and DD neutrons were measured separately and simultaneously with this system. The experimental result indicates a possibility that this system is suitable for measurement of fuel ion density ratio on ITER.

JAEA Reports

Development of built-in mode converter type gyrotron with 120GHz, 500kW-0.1sec

Kasugai, Atsushi; Tsuneoka, Masaki; Sakamoto, Keishi; Maebara, Sunao; Imai, Tsuyoshi; Nagashima, Takashi; Kariya, Tsuyoshi*; *; *; Hayashi, Kenichi*; et al.

JAERI-Research 95-041, 18 Pages, 1995/06

JAERI-Research-95-041.pdf:0.92MB

no abstracts in English

Journal Articles

High-power and long-pulse gyrotron development in JAERI

Kasugai, Atsushi; Sakamoto, Keishi; Tsuneoka, Masaki; Maebara, Sunao; Nagashima, Takashi; Imai, Tsuyoshi; Kariya, Tsuyoshi*; *; *; *; et al.

Fusion Engineering and Design, 26, p.281 - 286, 1995/00

 Times Cited Count:7 Percentile:59.2(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Safety handling of beryllium for fusion technology R & D

Yoshida, Hiroshi; *; Terai, Takayuki*; Odawara, Osamu*; *; *

JAERI-M 92-100, 97 Pages, 1992/07

JAERI-M-92-100.pdf:3.51MB

no abstracts in English

Journal Articles

Development of a high power gyrotron for ECH of tokamak plasma

Sakamoto, Keishi; Tsuneoka, Masaki; Maebara, Sunao; Kasugai, Atsushi; Fujita, Hideo*; *; Yamamoto, Takumi; Nagashima, Takashi; Kariya, Tsuyoshi*; *; et al.

Proceedings of the 17th International Conference on Infrared and Millimeter Waves, p.188 - 189, 1992/00

no abstracts in English

Oral presentation

Development of simultaneous measurement for DT and DD neutrons by TOF method

Okada, Koichi; Kondo, Keitaro; Sato, Satoshi; Nishitani, Takeo; Nomura, Ken*; Okamoto, Atsushi*; Iwasaki, Tomohiko*; Kitajima, Sumio*; Sasao, Mamiko*

no journal, , 

no abstracts in English

Oral presentation

Development of the method of fuel ratio measurement with neutron measurement planned on ITER experiments

Okada, Koichi; Kondo, Keitaro; Ochiai, Kentaro; Sato, Satoshi; Konno, Chikara; Nishitani, Takeo; Nomura, Ken*; Okamoto, Atsushi*; Kitajima, Sumio*; Sasao, Mamiko*

no journal, , 

no abstracts in English

Oral presentation

Measurement of neutron for particles control in burning plasma

Okada, Koichi*; Kondo, Keitaro; Ochiai, Kentaro; Sato, Satoshi; Konno, Chikara; Okamoto, Atsushi*; Kobuchi, Takashi*; Kitajima, Sumio*; Sasao, Mamiko*

no journal, , 

no abstracts in English

Oral presentation

Characteristics of stilbene detectors for DD neutrons using digital signal processing

Ishii, Keiichi*; Shinohara, Koji; Takakura, Kosuke; Ochiai, Kentaro; Isobe, Mitsutaka*; Baba, Mamoru*; Kashiwa, Soichiro*; Okamoto, Atsushi*; Kitajima, Sumio*; Sasao, Mamiko*

no journal, , 

no abstracts in English

Oral presentation

Separation behavior of Am(III) from lanthanide(III) by TPEN-NIPA Gel and the separation mechanism study

Suzuki, Shinichi; Akutsu, Kazuhiro; Yaita, Tsuyoshi; Okamoto, Yoshihiro; Ogata, Tsuyoshi*; Takeshita, Kenji*; Inaba, Yusuke*; Ikeda, Atsushi; Kobayashi, Toru; Oaki, Hiroshi*; et al.

no journal, , 

no abstracts in English

Oral presentation

Analysis of tungsten transport in JT-60U toroidally rotating plasmas

Shimizu, Yusuke*; Fujita, Takaaki*; Okamoto, Atsushi*; Arimoto, Hideki*; Hayashi, Nobuhiko; Hoshino, Kazuo; Nakano, Tomohide; Honda, Mitsuru

no journal, , 

no abstracts in English

Oral presentation

Compositional dependence on the local structure of the simulated nuclear waste glass samples

Okamoto, Yoshihiro; Masuno, Atsunobu*; Owaku, Kohei*; Tsukada, Takeshi*; Kanehira, Norio*

no journal, , 

In the development of vitrification technology for high burnup fuel and MOX fuel, tests using various compositions of raw glass materials were conducted to find the optimum composition. The Si/B ratio and the amount of alkali in the raw glass, and even the loading ratio of waste components were varied. In this study, we summarize the composition dependence obtained by structural analysis of those samples.

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