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Journal Articles

Completion of solidification and stabilization for Pu nitrate solution to reduce potential risks at Tokai Reprocessing Plant

Mukai, Yasunobu; Nakamichi, Hideo; Kobayashi, Daisuke; Nishimura, Kazuaki; Fujisaku, Sakae; Tanaka, Hideki; Isomae, Hidemi; Nakamura, Hironobu; Kurita, Tsutomu; Iida, Masayoshi*; et al.

Proceedings of 2017 International Congress on Advances in Nuclear Power Plants (ICAPP 2017) (CD-ROM), 8 Pages, 2017/04

TRP has stored the plutonium in solution state for long-term since the last PCDF operation in 2007 was finished. After the great east Japan earthquake in 2011, JAEA had investigated the risk against potential hazard of these solutions which might lead to make hydrogen explosion and/or boiling of the solution accidents with the release of radioactive materials to the public when blackout. To reduce the risk for storing Pu solution (about 640 kg Pu), JAEA planned to perform the process operation for the solidification and stabilization of the solution by converted into MOX powder at PCDF in 2013. In order to perform PCDF operation without adaption of new safety regulation, JAEA conducted several safety measures such as emergency safety countermeasures, necessary security and safeguards (3S) measures with understanding of NRA. As a result, the PCDF operation had stared on 28th April, 2014, and successfully completed to convert MOX powder on 3rd August, 2016 for about 2 years as planned.

JAEA Reports

Annual report on the environmental radiation monitoring around the Tokai Reprocessing Plant FY2014

Watanabe, Hitoshi; Nakano, Masanao; Fujita, Hiroki; Takeyasu, Masanori; Mizutani, Tomoko; Isozaki, Tokuju*; Nagaoka, Mika; Hokama, Tomonori; Yokoyama, Hiroya; Nishimura, Tomohiro; et al.

JAEA-Review 2015-034, 175 Pages, 2016/03

JAEA-Review-2015-034.pdf:8.13MB

Environmental radiation monitoring around the Tokai Reprocessing Plant has been performed by the Nuclear Fuel Cycle Engineering Laboratories, based on "Safety Regulations for the Reprocessing Plant of Japan Atomic Energy Agency, Chapter IV - Environmental Monitoring". This annual report presents the results of the environmental monitoring and the dose estimation to the hypothetical inhabitant due to the radioactivity discharged from the plant to the atmosphere and the sea during April 2014 to March 2015. In this report, some data include the influence of the accidental release from the Fukushima Daiichi Nuclear Power Station of Tokyo Electric Power Co. in March 2011.

JAEA Reports

Annual report on the environmental radiation monitoring around the Tokai Reprocessing Plant FY2013

Watanabe, Hitoshi; Nakano, Masanao; Fujita, Hiroki; Takeyasu, Masanori; Mizutani, Tomoko; Isozaki, Tokuju; Morisawa, Masato; Nagaoka, Mika; Hokama, Tomonori; Yokoyama, Hiroya; et al.

JAEA-Review 2014-042, 175 Pages, 2015/01

JAEA-Review-2014-042.pdf:10.89MB

Environmental radiation monitoring around the Tokai Reprocessing Plant has been performed by the Nuclear Fuel Cycle Engineering Laboratories, based on "Safety Regulations for the Reprocessing Plant of Japan Atomic Energy Agency, Chapter IV - Environmental Monitoring". This annual report presents the results of the environmental monitoring and the dose estimation to the hypothetical inhabitant due to the radioactivity discharged from the plant to the atmosphere and the sea during April 2013 to March 2014. In this report, some data include the influence of the accidental release from the Fukushima Daiichi Nuclear Power Plant of Tokyo Electric Power Co. in March 2011.

JAEA Reports

Annual report on the environmental radiation monitoring around the Tokai Reprocessing Plant FY2012

Sumiya, Shuichi; Watanabe, Hitoshi; Miyagawa, Naoto; Nakano, Masanao; Nakada, Akira; Fujita, Hiroki; Takeyasu, Masanori; Isozaki, Tokuju; Morisawa, Masato; Mizutani, Tomoko; et al.

JAEA-Review 2013-056, 181 Pages, 2014/03

JAEA-Review-2013-056.pdf:6.22MB

Environmental radiation monitoring around the Tokai Reprocessing Plant has been performed by the Nuclear Fuel Cycle Engineering Laboratories, based on "Safety Regulations for the Reprocessing Plant of Japan Atomic Energy Agency, Chapter IV - Environmental Monitoring". This annual report presents the results of the environmental monitoring and the dose estimation to the hypothetical inhabitant due to the radioactivity discharged from the plant to the atmosphere and the sea during April 2012 to March 2013. In this report, some data include the influence of the accidental release from the Fukushima Daiichi Nuclear Power Plant of Tokyo Electric Power Co. in March 2011.

Journal Articles

Investigation on highly alkaline plume spreading over host rock of geological disposal of TRU waste by reactive transport analysis

Takeda, Seiji; Nishimura, Yuki; Munakata, Masahiro; Sawaguchi, Takuma; Kimura, Hideo

Genshiryoku Bakkuendo Kenkyu (CD-ROM), 19(2), p.23 - 38, 2012/12

In safety assessments of the geological disposal of TRU waste, it is important to understand the possibility and extents of influence of hyperalkaline groundwater derived from the degradation of cementitious materials that are used as forms for the containment of waste and as constructional materials in the disposal facilities of TRU waste. In this research, reactive transport analyses of hyperalkaline plume induced by cementitious materials were performed to clarify the extent of the hyperalkaline groundwater spreading and the type of alterations occurring with or without considering the precipitation of zeolite. The effect of the groundwater velocities on the spread of hyperalkaline groundwater was also examined. The analysis results indicate that whether zeolites precipitate or not significantly affect extent of hyperalkaline groundwater and the amount of precipitation of secondary minerals. In the case that groundwater velocity was 10 times higher, hyperalkaline groundwater spread broader than the original groundwater velocity case. It might be due to our kinetic dissolution model of host rock minerals, which limits chemical reactions neutralizing hyperalkaline groundwater.

Journal Articles

FIREX project and effects of self-generated electric and magnetic fields on electron-driven fast ignition

Mima, Kunioki*; Sunahara, Atsushi*; Shiraga, Hiroyuki*; Nishimura, Hiroaki*; Azechi, Hiroshi*; Nakamura, Tatsufumi; Jozaki, Tomoyuki*; Nagatomo, Hideo*; Garcia, C.*; Veralde, P.*

Plasma Physics and Controlled Fusion, 52(12), p.124047_1 - 124047_6, 2010/12

 Times Cited Count:9 Percentile:37.31(Physics, Fluids & Plasmas)

Fast ignition is a new scheme in laser fusion, in which higher energy gain with a smaller laser pulse energy is expected. At Osaka University, a laser with four beams and a total output of 10 kJ ps-1, laser for fast ignition experiment (LFEX), has been constructed and we have carried out an integrated experiment with one beam of the LFEX. Through experiments it was found that the coupling efficiency is degraded when the laser pre-pulse is not sufficiently small. Furthermore, the distance between the hot electron source and the core plasma is large. In this paper it is proposed that a thin foil covers the laser entrance of the cone to mitigate the pre-plasma and a double cone reduces the loss of high energy electrons from the side wall of the cone. The simulations indicate that a higher coupling efficiency is expected for the double cone target with a thin foil at the laser entrance.

Journal Articles

JSME construction standard for superconducting magnet of fusion facility "Material"

Nishimura, Arata*; Nakajima, Hideo

Proceedings of 2009 ASME Pressure Vessels and Piping Division Conference (PVP 2009) (CD-ROM), 8 Pages, 2009/07

Japan Atomic Energy Agency (JAEA) has contributed to development of the structural standard for superconducting magnets entitled "Codes for Fusion Facilities - Rules on Superconducting Magnet Structure (2008)" issued by the Japan Society of Mechanical Engineers (JSME) in October 2009. This code consists of 7 sections, such as general requirements including quality assurance, material, design, fabrication (welding), non-destructive examination, pressure and leak test, and terminology. This paper describes technical contents on material section of the code. The feature of the code is to specify cryogenic materials such as JJ1, which was newly developed by JAEA, and 316LN, which is calcified by the carbon and nitrogen (C+N) contents. The design strengths from room temperature to cryogenic temperature of these materials are given in a quadratic function when the materials are as-solution heat-treated.

Journal Articles

JSME construction standard for superconducting magnet of fusion facility "Quality assurance"

Suzuki, Tetsuya*; Nishimura, Arata*; Nakajima, Hideo

Proceedings of 2009 ASME Pressure Vessels and Piping Division Conference (PVP 2009) (CD-ROM), 4 Pages, 2009/07

Japan Atomic Energy Agency (JAEA) has contributed to development of the structural standard for superconducting magnets entitled "Codes for Fusion Facilities - Rules on Superconducting Magnet Structure (2008)" issued by the Japan Society of Mechanical Engineers (JSME) in October 2009. This code consists of 7 sections, such as general requirements including quality assurance, material, design, fabrication (welding), non-destructive examination, pressure and leak test, and terminology. This paper describes technical contents on quality assurance section of the code. Quality assurance requirement consists of 18 articles such as organization, quality assurance program, design control, document control etc. Each article is designed to constitute simplified performance based requirement. In conformity assessment, realistic Qualified Inspection and Design Certification are pursued, considering the legislation, infrastructure and prospective user of standard in Japan. Role and responsibility of Qualified Inspector and Standard-Expert Engineer are newly defined in the code.

Journal Articles

Development of a Rhenium-186-labeled MAG3-conjugated bisphosphonate for the palliation of metastatic bone pain based on the concept of bifunctional radiopharmaceuticals

Ogawa, Kazuma*; Mukai, Takahiro*; Arano, Yasushi*; Ono, Masahiro*; Hanaoka, Hirofumi*; Ishino, Seigo*; Hashimoto, Kazuyuki; Nishimura, Hiroshi*; Saji, Hideo*

Bioconjugate Chemistry, 16(4), p.751 - 757, 2005/07

 Times Cited Count:59 Percentile:87.42(Biochemical Research Methods)

Rhenium-186-1-hydroxyethylidene-1,1-diphosphonate ($$^{186}$$Re-HEDP) has been used for the palliation of metastatic bone pain. Delayed blood clearance and high gastric uptake of radioactivity have been observed upon injection, due to the instability of $$^{186}$$Re-HEDP in vivo. In this study, on the basis of the concept of bifunctional radiopharmaceuticals, we designed a stable $$^{186}$$Re-mercaptoacetylglycylglycylglycine (MAG3) complex-conjugated bisphosphonate ($$^{186}$$Re-MAG3-HBP). After purification by HPLC, $$^{186}$$Re-MAG3-HBP was synthesized with a radiochemical purity of over 95%. In biodistribution experiments, the radioactivity level of$$^{186}$$Re-MAG3-HBP in bone was significantly higher than that of $$^{186}$$Re-HEDP. Blood clearance of $$^{186}$$Re-MAG3-HBP was faster than that of $$^{186}$$Re-HEDP. In addition, the gastric accumulation of $$^{186}$$Re-MAG3-HBP radioactivity was lower than that of $$^{186}$$Re-HEDP. In conclusion, $$^{186}$$Re-MAG3-HBP is expected to be a useful radiopharmaceutical for the palliation of metastatic bone pain.

Journal Articles

Design of a radiopharmaceutical for the palliation of painful bone metastases; Rhenium-186-labeled bisphosphonate derivative

Ogawa, Kazuma*; Mukai, Takahiro*; Arano, Yasushi*; Hanaoka, Hirofumi*; Hashimoto, Kazuyuki; Nishimura, Hiroshi*; Saji, Hideo*

Journal of Labelled Compounds and Radiopharmaceuticals, 47(11), p.753 - 761, 2004/11

 Times Cited Count:27 Percentile:62.35(Biochemical Research Methods)

no abstracts in English

Journal Articles

Technical preparations for atmospheric radioactivity monitoring

Miyamoto, Yutaka; Oda, Tetsuzo; Adachi, Takeo; Noguchi, Hiroshi; Nishimura, Hideo; Usuda, Shigekazu

Nukleonika, 46(4), p.123 - 126, 2001/12

no abstracts in English

JAEA Reports

Study of uranium particle fuel fabrication with the external gelation process with the vibration dropping Method

Nishimura, Kazuhisa; Shoji, Shuichi*; *; Sato, Seiichi*; ; Endo, Hideo

JNC TN8430 2001-005, 64 Pages, 2001/09

JNC-TN8430-2001-005.pdf:4.1MB

The external gelation process is one of the candidates of MOX particle fuel fabrication for advanced recycle system. It was necessary to perform preliminary fuel fabrication with uranium before starting MOX tests. As the result of the preliminary examination, Basics conditions of the fabrication were obtained: (1)Optimized uranyl nitrate solution and PVA solution, as raw materials were prepared. (2)The frequency of vibration and the amount of flow were obtained with optimized broth (mixture) in the vibration dropping process. (3)The influence of composition of broth and concentration of ammonia solution on gelation process was obtained. (4)Impurities after aging, washing and drying spHerical gel were surveyed, (5)The spherical gel were calcined to oxide particles and the particles were characterized by TG-DTA, therefore it is certain that outlook on the sintered particles as final products is very clear. On the top of that, there were no fatal technicalities of the external gelation process through material balance and a diameter dispersion of spherical gel and oxide particles. It is necessary to perform uranium examination to solve some new problems, for instant, surface crack of spherical gel. Although almost of all the preparations are completed and fabrication examination of MOX particles with vibration dropping equipment are ready for starting.

Journal Articles

Development of analytical techniques for ultra trace amounts of nuclear materials in environmental samples using ICP-MS for safeguards

Magara, Masaaki; Hanzawa, Yukiko; Esaka, Fumitaka; Miyamoto, Yutaka; Yasuda, Kenichiro; Watanabe, Kazuo; Usuda, Shigekazu; Nishimura, Hideo; Adachi, Takeo

Applied Radiation and Isotopes, 53(1-2), p.87 - 90, 2000/07

 Times Cited Count:26 Percentile:83.97(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Progress of environmental sampling program at Japan Atomic Energy Research Institute

Nishimura, Hideo; Magara, Masaaki; Hanzawa, Yukiko; Esaka, Fumitaka; Takahashi, Tsukasa; Gunji, Katsubumi; Miyamoto, Yutaka; Yasuda, Kenichiro; Tsuruta, Yasuhiro; Tsuda, Shinji; et al.

Heisei 11-Nendo Hosho Sochi Semina Koenroku Tekisuto, p.95 - 107, 2000/01

no abstracts in English

Journal Articles

Characterization of individual particles including lead by combination of SIMS and EPMA

Esaka, Fumitaka; Watanabe, Kazuo; Magara, Masaaki; Hanzawa, Yukiko; Usuda, Shigekazu; Gunji, Katsubumi; Nishimura, Hideo; Adachi, Takeo

Proceedings of 12th International Conference on Secondary Ion Mass Spectrometry (SIMS 12), p.977 - 980, 2000/00

no abstracts in English

Journal Articles

Present status of JAERI's project on the development of environmental sample analysis techniques

Usuda, Shigekazu; Adachi, Takeo; Watanabe, Kazuo; Magara, Masaaki; Hanzawa, Yukiko; Esaka, Fumitaka; Miyamoto, Yutaka; Yasuda, Kenichiro; Gunji, Hideho; Tsuruta, Yasuhiro; et al.

Proceedings of Seminar on Strengthening of Safeguards: Integrating the New and the Old, p.477 - 481, 2000/00

no abstracts in English

Journal Articles

Development of environmental sample analysis techniques for safeguards and its current status

Magara, Masaaki; Hanzawa, Yukiko; Esaka, Fumitaka; Miyamoto, Yutaka; Yasuda, Kenichiro; Tsuruta, Yasuhiro; Tsuda, Shinji; Watanabe, Kazuo; Usuda, Shigekazu; Nishimura, Hideo; et al.

Kaku Busshitsu Kanri Gakkai Nihon Shibu Dai-20-Kai Kinen Taikai Rombunshu, p.183 - 187, 1999/11

no abstracts in English

Journal Articles

CTBT international monitoring system on radionuclides and NDC

Takano, Makoto; Oda, Tetsuzo; Nishimura, Hideo; Adachi, Takeo

Kaku Busshitsu Kanri Gakkai Nihon Shibu Dai-20-Kai Kinen Taikai Rombunshu, p.100 - 105, 1999/11

no abstracts in English

Journal Articles

Presentations at international safeguards sessions in the 21st annual meeting; symposium on safeguards and nuclear material management

Nishimura, Hideo

Kaku Busshitsu Kanri Senta Nyusu, 28(8), p.5 - 7, 1999/08

no abstracts in English

Journal Articles

Development programme of analytical techniques for ultra trace amounts of nuclear materials in environmental samples for safeguards-from a viewpoint of speciation technology

Hanzawa, Yukiko; Magara, Masaaki; Esaka, Fumitaka; Watanabe, Kazuo; Usuda, Shigekazu; Miyamoto, Yutaka; Gunji, Katsubumi; Yasuda, Kenichiro; Nishimura, Hideo; Adachi, Takeo

Proceedings of OECD/NEA Workshop on Evaluation of Speciation Technology, p.167 - 172, 1999/00

no abstracts in English

49 (Records 1-20 displayed on this page)