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Journal Articles

Morphological reproductive characteristics of testes and fertilization capacity of cryopreserved sperm after the Fukushima accident in raccoon (${it Procyon lotor}$)

Komatsu, Kazuki*; Iwasaki, Tsugumi*; Murata, Kosuke*; Yamashiro, Hideaki*; Goh, V. S. T.*; Nakayama, Ryo*; Fujishima, Yohei*; Ono, Takumi*; Kino, Yasushi*; Shimizu, Yoshinaka*; et al.

Reproduction in Domestic Animals, 56(3), p.484 - 497, 2021/03

 Times Cited Count:9 Percentile:88.06(Agriculture, Dairy & Animal Science)

We have established an archive system of livestock and wild animals from the surrounding ex-evacuation zone. Wildlife within the alert zone have been exposed to low-dose-rate (LDR) radiation for a long and continuous time. In this study, we analysed the morphological characteristics of the testes and in vitro fertilization (IVF) capacity of cryopreserved sperm of raccoons from the ex-evacuation zone of the FDNPP accident. This study revealed that the chronic and LDR radiation exposure associated with the FDNPP accident had no adverse effect on the reproductive characteristics and functions of male raccoons.

JAEA Reports

The Second periodic safety review report of Tokai Reprocessing Plant

Shirai, Nobutoshi; Miura, Yasushi; Tachibana, Ikuya; Omori, Satoru; Wake, Junichi; Fukuda, Kazuhito; Nakano, Takafumi; Nagasato, Yoshihiko

JAEA-Technology 2016-007, 951 Pages, 2016/07

JAEA-Technology-2016-007-01.pdf:11.93MB
JAEA-Technology-2016-007-02.pdf:4.7MB

The periodic safety review of TRP is to confirm the safety activities and get effective additional measures the facility safety and its reliability. We implemented 4 items; for (1) evaluation of safety activity implementation, we confirmed we are adequately expanding its safety activities by the necessary documents and schemes. For (2) evaluation of status of safety activities reflecting the latest technical knowledges, we confirmed we reflect latest knowledges for improvement of safety and reliability. For (3) technical evaluation about aging degradation, we can keep the safety of the facilities important to safety and the sea discharge line, under assumption of the present maintenance, because of "focuses for aging degradation". For (4) planning measures about a 10-years-plan that the operator shall implement to keep the facility condition, by the technical evaluation, we found no additional safety plans into maintenance strategies.

Journal Articles

Progress report of Japanese simulation research projects using the high-performance computer system Helios in the International Fusion Energy Research Centre

Ishizawa, Akihiro*; Idomura, Yasuhiro; Imadera, Kenji*; Kasuya, Naohiro*; Kanno, Ryutaro*; Satake, Shinsuke*; Tatsuno, Tomoya*; Nakata, Motoki*; Nunami, Masanori*; Maeyama, Shinya*; et al.

Purazuma, Kaku Yugo Gakkai-Shi, 92(3), p.157 - 210, 2016/03

The high-performance computer system Helios which is located at The Computational Simulation Centre (CSC) in The International Fusion Energy Research Centre (IFERC) started its operation in January 2012 under the Broader Approach (BA) agreement between Japan and the EU. The Helios system has been used for magnetised fusion related simulation studies in the EU and Japan and has kept high average usage rate. As a result, the Helios system has contributed to many research products in a wide range of research areas from core plasma physics to reactor material and reactor engineering. This project review gives a short catalogue of domestic simulation research projects. First, we outline the IFERC-CSC project. After that, shown are objectives of the research projects, numerical schemes used in simulation codes, obtained results and necessary computations in future.

Journal Articles

Application of wireless LAN technology to remote monitoring for inspection equipment

Ishiyama, Koichi; Kimura, Takashi; Miura, Yasushi; Yamaguchi, Katsuhiro*; Kabuki, Toshihide*

Kaku Busshitsu Kanri Gakkai (INMM) Nihon Shibu Dai-32-Kai Nenji Taikai Rombunshu (Internet), 8 Pages, 2011/11

To support inspections under an Integrated Safeguards regime into Tokai Reprocessing Plant (TRP), the IAEA suggested making use of Remote Monitoring (RM) capabilities to the inspection equipment (surveillance camera and NDA systems) installed in the spent fuel storage area at TRP. Since the spent fuel storage area in TRP did not have pre-prepared cabling infrastructure for data transmission, the option of wireless LAN was chosen over the telephone line due to its lower installation costs. Feasibility studies and tests were performed by TRP on communication and particularly on long-term continuous communication using wireless LAN equipment (AP: Access Point) and an external antenna for introducing wireless LAN technology to RM. As a result it was recognized that wireless LAN has enough ability to communicate for long periods of time and consequently the IAEA installed AP and an external antenna to each inspection equipment and the wireless LAN technology was applied for RM.

JAEA Reports

Study on applicability of low alkaline cement in Horonobe Underground Research Laboratory Project, 3 (Contract research)

Nakayama, Masashi; Kobayashi, Yasushi; Noguchi, Akira; Miura, Norihiko*; Noda, Masaru*; Iriya, Keishiro*; Hitomi, Takashi*

JAEA-Research 2009-036, 49 Pages, 2009/11

JAEA-Research-2009-036.pdf:20.34MB

In Horonobe Underground Research Laboratory (Horonobe URL) Project, construction practicality test with HFSC (Highly Fly-ash contained Silica-fume Cement) is planned in a part of the gallery. It is necessary to validate that HFSC has performance under the actual construction, before HFSC is placed in the gallery. The main tasks in 2008 are follows; (1) suggestion of mix design for liner concrete of shaft in Horonobe URL, (2) investigation of long term pH changes in order to use for modeling, and (3) an experiment for interaction between HFSC and ground water around Horonobe URL. (1) 4 types of mix proportion are designed for ordinary concrete and high strength concrete which contains polypropylene fiber or not. As early age strength, 5N/mm$$^{2}$$ is required because of concrete formwork. HFSC424 with low water binder ratio can fulfill this requirement in combination with super plasticizer. (2) pH and components of solid and liquid phase which were made in 2003, and stored in water were analyzed. And cement paste of shotcrete which are made in 2006 were also analyzed. In this pH of shotcrete is lower than other in situ concrete since accelerating agent may act as decreasing factor of pH. (3) An experiment which investigates dissolution of HFSC cement hydrates to ground water around Horonobe URL. According to the experiment, dissolving depth of HFSC is 4 times small comparing to Ordinary Portland Cement hydrates after 30th water exchange.

Journal Articles

Development of integrated safeguards approach for JNC-1 site from the operator's viewpoint

Asano, Takashi; Fujiwara, Shigeo; Takahashi, Saburo; Nagatani, Taketeru; Fukuhara, Junichi; Kodani, Yoshiki; Kimura, Takashi; Miura, Yasushi

Proceedings of INMM 50th Annual Meeting (CD-ROM), 10 Pages, 2009/00

JAEA commenced to consider the integrated safeguards (IS) approach for JNC-1 site as the new concept of safeguards for further reduction of influence of facility operation by the safeguards activity. On the other hand, the board of governors of IAEA led the broader conclusion to Japan on June 2004 and safeguards implementation in Japan was transferred to the IS scheme in September 2004. IAEA aimed to improve efficiency of safeguards implementation for the plutonium handling facility by optimization of use of advanced safeguards systems and new safeguards regime without reduction of effectiveness of safeguards. The IS approach for JNC-1 site was developed and implemented on August 2008 after many discussions among IAEA, Japan Safeguards Office (JSGO) and JAEA. This paper shows contributions by JAEA to development of this approach from the operator's view point and influence to the operator by implementation of IS approach.

Journal Articles

Study of plasma termination using high-Z noble gas puffing in the JT-60U tokamak

Bakhtiari, M.; Tamai, Hiroshi; Kawano, Yasunori; Kramer, G. J.*; Isayama, Akihiko; Nakano, Tomohide; Kamiya, Kensaku; Yoshino, Ryuji; Miura, Yukitoshi; Kusama, Yoshinori; et al.

Nuclear Fusion, 45(5), p.318 - 325, 2005/05

 Times Cited Count:44 Percentile:78.77(Physics, Fluids & Plasmas)

In the previous works we had shown that injecting a mixture of large amounts of hydrogen and small amounts of argon can terminate a tokamak discharge quickly with avoiding runaway electron generation. In this work we have done the same experiments but with different gases in addition to argon. In fact we compared the effect of the puffing of argon, krypton, and xenon gases with and without simultaneous hydrogen gas puffing on disruption mitigation. We observed that injecting all impurities in the form of an admixture in hydrogen lead to faster plasma shutdowns with less runaway electron generation. We also found that injecting krypton gas (with or without hydrogen) seems to be a good candidate for plasma shutdown purposes since it induces low heat flux to divertor plates and avoids runaway electron generation more effectively.

Journal Articles

Energetic particle physics in JT-60U and JFT-2M

Shinohara, Koji; Takechi, Manabu; Ishikawa, Masao; Kusama, Yoshinori; Tsuzuki, Kazuhiro; Urata, Kazuhiro*; Kawashima, Hisato; Tobita, Kenji; Fukuyama, Atsushi*; Cheng, C. Z.*; et al.

Plasma Physics and Controlled Fusion, 46(7), p.S31 - S45, 2004/07

 Times Cited Count:42 Percentile:77.96(Physics, Fluids & Plasmas)

Recent energetic particle physics research has been devoted to Alfven eigenmodes (AEs) in reversed-shear (RS) plasmas, energetic ion transport in the appearance of modes in the frequency range of TAE, energetic ion behavior in the plasma with a current hole, and ripple loss in the complex toroidal field ripple due to ferritic steel plates. We will report these recent progresses for energetic particle physics in JT-60U and JFT-2M.

Journal Articles

Fast plasma shutdown scenarios in the JT-60U tokamak using intense mixed gas puffing

Bakhtiari, M.; Kawano, Yasunori; Tamai, Hiroshi; Miura, Yushi; Yoshino, Ryuji; Nishida, Yasushi*

Nuclear Fusion, 42(10), p.1197 - 1204, 2002/10

 Times Cited Count:48 Percentile:80.19(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Prototype tokamak fusion power reactor based on SiC/SiC composite material, focussing on easy maintenance

Nishio, Satoshi; Ueda, Shuzo; Kurihara, Ryoichi; Kuroda, Toshimasa*; Miura, H.*; Sako, Kiyoshi*; Takase, Kazuyuki; Seki, Yasushi; Adachi, Junichi*; Yamazaki, Seiichiro*; et al.

Fusion Engineering and Design, 48(3-4), p.271 - 279, 2000/09

 Times Cited Count:16 Percentile:72.09(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Improved tokamak concept focusing on easy maintenance

Nishio, Satoshi; Ueda, Shuzo; Aoki, Isao; Kurihara, Ryoichi; Kuroda, Toshimasa*; Miura, H.*; Kunugi, Tomoaki; Takase, Kazuyuki; Seki, Yasushi; Shinya, K.*; et al.

Fusion Engineering and Design, 41, p.357 - 364, 1998/00

 Times Cited Count:51 Percentile:95.43(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Maintenance oriented tokamak reactor with low activation material and high aspect ratio configuration

Nishio, Satoshi; Ueda, Shuzo; Aoki, Isao; Kuroda, Toshimasa*; Miura, H.*; Kurihara, Ryoichi; Kunugi, Tomoaki; Seki, Yasushi

Fusion Energy 1996, 3, p.693 - 699, 1997/00

no abstracts in English

JAEA Reports

Repeating pneumatic pellet injector in JAERI

Kasai, Satoshi; Hasegawa, Koichi; Oda, Yasushi*; Onozuka, Masanori*; Suzuki, Sadaaki; Miura, Yukitoshi; Tsujimura, Seiichi*

JAERI-M 92-143, 40 Pages, 1992/09

JAERI-M-92-143.pdf:1.99MB

no abstracts in English

JAEA Reports

Japanese contributions to blanket design for ITER

Kuroda, Toshimasa*; Yoshida, Hiroshi; Takatsu, Hideyuki; Seki, Yasushi; Noda, Kenji; Watanabe, H.; Koizumi, Koichi; Nishio, Satoshi; *; *; et al.

JAERI-M 91-133, 191 Pages, 1991/08

JAERI-M-91-133.pdf:5.79MB

no abstracts in English

Journal Articles

Development of fast$$cdot$$multi-pellet injector

Hasegawa, Koichi; Kasai, Satoshi; Miura, Yukitoshi; Suzuki, Sadaaki; Oda, Yasushi*; Onozuka, Masanori*; Shimomura*

NIFS-MEMO-3, p.99 - 102, 1991/07

no abstracts in English

Oral presentation

Study on fundamental properties of low alkaline cementitious grouting materials based on laboratory tests

Miura, Norihiko*; Noda, Masaru*; Kobayashi, Yasushi; Yamada, Tsutomu

no journal, , 

no abstracts in English

Oral presentation

Safeguards activities at Tokai Reprocessing Plant (TRP)

Miura, Yasushi; Fukuhara, Junichi

no journal, , 

Oral presentation

Operator's experience in random interim inspection for reprocessing plant at JNC-1 site

Ishiyama, Koichi; Miura, Yasushi; Kimura, Takashi; Hina, Tetsuro; Kodani, Yoshiki; Fukuhara, Junichi; Yamaguchi, Katsuhiro*; Ikeda, Atsushi*; Kabuki, Toshihide*

no journal, , 

Regarding the Integrated Safeguards (IS) for JNC-1 site where includes facilities of the Reprocessing Center and so on, its discussion for application started in March 2004 between the government of Japan and IAEA, and it has been introduced in August 2008. With IS for JNC-1, for the purpose of improvement of deterrence of the nuclear material diversion, the traditional interim inventory verification (IIV) has changed to random interim inspection with short notice (RII.) The Tokai Reprocessing Center consists of TRP and PCDF, and has nuclear materials from the spent fuel to the MOX powder. The IIV needed about 5 person-days for TRP and about 7 person-days for PCDF. It was discussed to make RII procedure that makes it possible to perform such short notice inspection and reduce the person-days by about 2 per a RII. After the introduction of RII, the person-days are decreased even though the operators' work loads for information provision are increased.

Oral presentation

A Study on material properties of cast-in-place concrete using low alkaline cement

Noguchi, Akira; Nakayama, Masashi; Kobayashi, Yasushi; Miura, Norihiko*; Noda, Masaru*; Iriya, Keishiro*

no journal, , 

no abstracts in English

Oral presentation

The Project for grouting technology development for the high level radioactive waste repository, 3; Selection of mix proportion on low-pH cementitious grout

Miura, Norihiko*; Namiki, Kazuto*; Kobayashi, Yasushi; Yamada, Tsutomu

no journal, , 

no abstracts in English

28 (Records 1-20 displayed on this page)