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JAEA Reports

Annual report on the activities in Safety Administration Department; Report of the fiscal year 2011

Aoki, Yoshikazu

JAEA-Review 2014-053, 371 Pages, 2015/06

JAEA-Review-2014-053.pdf:85.29MB

The activities of Safety Administration Department covers many fields in Nuclear Fuel Cycle Engineering Laboratories such as the management of the occupational safety and health, the crisis management, the security, and the management of a quality assurance. This report is the summary of the activities of Safety Administration Department since April, 2011 until March, 2012.

Journal Articles

Development of a high current H$$^{-}$$ ion source for cyclotrons

Eto, Haruhiko*; Aoki, Yasushi*; Mitsubori, Hitoshi*; Arakawa, Y.*; Mitsumoto, Toshinori*; Yajima, S.*; Sakuraba, Junji*; Kato, Takanori*; Okumura, Yoshikazu

Review of Scientific Instruments, 85(2), p.02B107_1 - 02B107_3, 2014/02

 Times Cited Count:10 Percentile:45.66(Instruments & Instrumentation)

High current hydrogen negative ion source is required to increase the accelerated beam current of the cyclotrons for many medical applications such as cancer therapy and medical radioisotope production. A new negative ion source has been designed and fabricated. The ion source is a multi-cusp type. Optimization of the ion source is in progress, such as the optimization of the magnetic filter which prevents high temperature electrons from entering into the negative ion production region, improvement of the extraction electrode's shape and configuration of dipole magnets etc. A small quantity of Cs has been introduced into the ion source to enhance the negative ion beam current. The ion source produced 16mA of DC hydrogen negative ion beam with the Cs-seeded operation at a low arc discharge power of 2.8 kW.

JAEA Reports

Annual report on the activities in Safety Administration Department; Report of the fiscal year 2010

Aoki, Yoshikazu

JAEA-Review 2012-002, 411 Pages, 2014/01

JAEA-Review-2012-002.pdf:35.22MB

The activities of Safety Administration Department covers many fields in Nuclear Fuel Cycle Engineering Laboratories such as the management of the occupational safety and health, the crisis management, the security, and the management of a quality assurance. This report is the summary of the activities of Safety Administration Department since April, 2010 unitel March, 2011.

Journal Articles

Decommissioning plutonium fuel fabrication facility

Iemura, Keisuke; Nakai, Koji; Watahiki, Masatoshi; Kitamura, Akihiro; Suzuki, Kazunori; Aoki, Yoshikazu

Dekomisshoningu Giho, (43), p.2 - 9, 2011/03

Plutonium fuel fabrication facility is constructed in 1972 and it is almost 40 years of age and equipment and components comprises the facility start degrading. Therefore we need to start dismantling gloveboxes from old ones first and at the same time to maintain the facility components and structures and gloveboxes as necessary. Also, since waste storage space is limited in the site, we effectively use open spaces generated after removing gloveboxes and equipment as temporal waste storage space. After shipping these wastes from the facility, final characterization of the facility will be conducted and demolition of the facility will be take place.

JAEA Reports

Report on the training for an intruder

Aoki, Yoshikazu; ; ;

JNC-TN8440 2002-018, 14 Pages, 2002/12

JNC-TN8440-2002-018.pdf:0.3MB

Crisis management section members of Japan Nuclear Cycle Development Institute(JNC) Tokai Works had implemented two types of trainings against terrorism in last Japanese fiscal year and improved the countermeasure against the terrorism. In this fiscal year we trained against the new type of terrorism in the period of about 1 year later of a series of attacks on America by terrorism. As a result of the training some points which need further improvements and new weak points have been availed as follows. (1)Enlightenment of workers' senses against terrorism. Few members of the Emergency Control Center, workers and guards looked tensionless in the training. The sense against terrorism needs to be enlightened. (2)Speediness of initial response. In this training the events using a car Went on more rapidly than expected. The rapid response to counter terrorism needs to be examined. (3)Improvement of fundamental countermeasures. The fundamental response of the workers to the terrorism under limited condition before the guard authorities' arrival has been improved further more through the education and trainings. (4)Completeness of the prevention of terrorism. After terrorism occurs, Tokai Works is helpless until the guard authorities arrive. First of all the measure to avoid terrorism occurrence is important. (5)Strengthen the cooperation with the guard authorities. Besides completeness of the prevention of terrorism it is necessary to cope with the guard authorities at ordinary times against an emergency.

JAEA Reports

None

Aoki, Yoshikazu;

PNC-TN8470 97-003, 55 Pages, 1997/11

PNC-TN8470-97-003.pdf:1.85MB

no abstracts in English

Journal Articles

None

Aoki, Yoshikazu; ;

Proceedings of International Conference on Future Nuclear Systems (Global'97), 0 Pages, 1997/00

None

Journal Articles

Fabrication and superconducting properties of Nb$$_{3}$$Al composite wire using the jelly roll process

Sakagami, Yoshihiro*; Yamazaki, Takayuki*; Aoki, Nobuo*; Ichihara, Masamitsu*; Masegi, Tamaki*; Murase, Satoru*; Matsui, Kunihiro; Ushigusa, Kenkichi; Kikuchi, Mitsuru; Takahashi, Yoshikazu

ICEC16/ICMC Proceedings, p.1681 - 1684, 1996/00

no abstracts in English

Journal Articles

Fabrication of superconductor for the DPC-TJ coil

Aoki, Nobuo*; *; *; *; Shimada, M.*; Hamajima, Takataro*; *; Fujioka, T.*; Takahashi, Yoshikazu; Ando, Toshinari; et al.

Cryogenics, 33(6), p.581 - 585, 1993/00

 Times Cited Count:2 Percentile:80.99

no abstracts in English

Journal Articles

Fabrication of the superconductor for the DPC-TJ coil

Aoki, Nobuo*; *; *; *; Shimada, M.*; Hamajima, Takataro*; *; Fujioka, T.*; Takahashi, Yoshikazu; Ando, Toshinari; et al.

Teion Kogaku, 27(3), p.221 - 225, 1992/00

no abstracts in English

Journal Articles

Development of a compact 18-T MF-(NbTi)$$_{3}$$Sn coil

Nishi, Masataka; Isono, Takaaki; Takahashi, Yoshikazu; Ando, Toshinari; Tsuji, Hiroshi; *; Aoki, Nobuo*; *; *

IEEE Transactions on Magnetics, 27(2), p.2280 - 2283, 1991/03

 Times Cited Count:3 Percentile:57.77(Engineering, Electrical & Electronic)

no abstracts in English

Journal Articles

Effect of chrome plating on the coupling current losses between strands in a Nb$$_{3}$$Sn cable-in-conduit conductor

Ando, Toshinari; Takahashi, Yoshikazu; Nishi, Masataka; Shimamoto, Susumi; Aoki, Nobuo*; *

Teion Kogaku, 22(6), p.362 - 367, 1987/00

no abstracts in English

Oral presentation

Development of actinides co-extraction system with direct extraction process using supercritical fluid, 10; Direct extraction test of unirradiated MOX fuel under supercritical condition

Kaji, Naoya; Kamiya, Masayoshi; Koma, Yoshikazu; Koizumi, Tsutomu; Koyama, Tomozo; Aoki, Kazuo*; Yamada, Seiya*

no journal, , 

no abstracts in English

Oral presentation

Status of MOX fuel development for the FBR system in JAEA

Ojima, Hisao; Ito, Masanori; Takahashi, Saburo; Asakura, Koichi; Aoki, Yoshikazu

no journal, , 

no abstracts in English

Oral presentation

Development of inventory evaluation methods for the radioactive wastes of Fukushima Daiichi Nuclear Power Station, 13; Introduction of stochastic approach to the modelling estimation method

Sugiyama, Daisuke*; Koma, Yoshikazu; Takahatake, Yoko; Aoki, Yoshio*; Nakabayashi, Ryo*; Fujita, Tomonari*

no journal, , 

The introduction of a stochastic approach to the calibration of the radionuclide transport parameters, which processes the frequency distribution of the analytical measured data accumulated progressively on the wastes and contaminated water, into the modelling estimation method of the radioactive waste inventory generated at the Fukushima Daiichi Nuclear Power Station is investigated. It is expected that the accuracy of the modelling estimation of radionuclide composition in wastes will be improved by describing the radionuclide transport parameters as a lognormal distribution.

Oral presentation

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