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JAEA Reports

Work and safety managements for on-site installation, commissioning, tests by EU of quench protection circuits for JT-60SA

Yamauchi, Kunihito; Okano, Jun; Shimada, Katsuhiro; Omori, Yoshikazu; Terakado, Tsunehisa; Matsukawa, Makoto; Koide, Yoshihiko; Kobayashi, Kazuhiro; Ikeda, Yoshitaka; Fukumoto, Masahiro; et al.

JAEA-Technology 2015-053, 36 Pages, 2016/03

JAEA-Technology-2015-053.pdf:8.33MB

The superconducting Satellite Tokamak machine "JT-60SA" under construction in Naka Fusion Institute is an international collaborative project between Japan (JA) and Europe (EU). The contributions for this project are based on the supply of components, and thus European manufacturer shall conduct the installation, commissioning and tests on Naka site. This means that Japan Atomic Energy Agency (JAEA) had a quite difficult issue to manage the works by European workers and their safety although there is no direct contract. This report describes the approaches for the work and safety managements, which were agreed with EU after the tough negotiation, and then the completed on-site works for Quench Protection Circuits (QPC) as the first experience for EU in JT-60SA project. With the help of these approaches by JAEA, the EU works for QPC were successfully completed with no accident, and a great achievement was made for both EU and JA.

Journal Articles

Evaluation of neutron dose released in the environment by activation of gold

Kushita, Kohei; Atarashi-Andoh, Mariko; Amano, Hikaru*

Bunseki Kagaku, 63(11), p.867 - 871, 2014/11

 Percentile:100(Chemistry, Analytical)

We report here the study of activated gold for the estimation of neutron dose in the environment in the case of JCO criticality accident happened in Tokai, Japan, in 1999. We collected and analyzed 16 gold samples, such as ring, coin or necklace stored at residents houses in the range from 168 to 568 m from the accident place of JCO. They gave activities from 91.9 to 0.322 Bq/g-Au as standardized values at 06:15, Oct. 1, 1999, when the criticality reaction had ceased after 20 hours of continuation. The induced radioactivity of gold samples showed a good correlation as a power function of distance. The induced radioactivity of gold is discussed with reference data to estimate dose equivalent in the environment around JCO. This paper gives an example showing the usefulness of gold in the field of nuclear and radiation studies and applications.

Journal Articles

A Basic radiation-education method using a handy-type cloud chamber and natural radiation sources

Kushita, Kohei

Proceedings of 17th Pacific Basin Nuclear Conference (PBNC-17) (CD-ROM), 9 Pages, 2010/10

At NuHRDeC/JAEA, many kinds of nuclear and radiation education have been conducted through its half-century history. High level education is required for the specialists of nuclear technology including nuclear power plants operators and engineers, while basic knowledge on nuclear energy and, especially, on radiations and radioisotopes should be given to school students and public. One of the useful basic experiments is the cloud chamber experiment. Using a new-type cloud chamber developed at NuHRDeC, we have further developed a new method so that the participants can more deeply understand the phenomena and the nature of radiation and radioisotopes. In this method, using a radiation source of natural uranium ore and gaseous radiation source containing Rn-220, trainees can not only observe the radiation tracks but also measure the length and count the number of the tracks. Then they can calculate the energy of the radiation (alpha ray) and can estimate the half-life of the radioisotope (Rn-220). This method can be applied for high-school and general university students as well as for the public as a useful and effective method in the radiation education.

Journal Articles

Comprehensive education and training activities at JAEA Nuclear Technology and Education Center

Sugimoto, Jun; Sakamoto, Ryuichi; Kushita, Kohei; Arai, Nobuyoshi; Hattori, Takamitsu; Matsuda, Kenji; Ikuta, Yuko; Sato, Koichi

Transactions of NESTet 2008 (CD-ROM), 6 Pages, 2008/05

Nuclear human resources development (HRD) in Japan has been identified as one of the most important issues these years in nuclear society, mostly due to the decrease of nuclear engineers in industries and students in universities, and to the difficulties of technical transfers. Nuclear Technology and Education Center (NuTEC) at Japan Atomic Energy Agency (JAEA) aims at comprehensive nuclear education and training activities, which cover (1) education and training for domestic nuclear engineers, (2) cooperation with universities and (3) international cooperation. The main feature of NuTEC's training programs is that the curricula places emphasis on the laboratory exercise with well-equipped training facilities and expertise of lecturers mostly from JAEA. The wide spectrum of cooperative activities have been pursued with universities, which includes newly developed remote-education system, and also with international organizations, such as with FNCA countries and IAEA.

JAEA Reports

Example of answers to the problems of the 37th examination for the chief engineer of nuclear fuel, 2005

Harada, Akio; Sato, Tadashi*; Nakajima, Kunihisa; Komuro, Yuichi; Shiraishi, Hirotsugu*; Hattori, Takamitsu; Ikuta, Yuko; Yachi, Shigeyasu; Kushita, Kohei

JAERI-Review 2005-026, 55 Pages, 2005/09

JAERI-Review-2005-026.pdf:1.95MB

This report provides an example of answers to the problems of the 37th Examination for the Chief Engineer of Nuclear Fuel. This examination was done as a national qualification in March 2005. Brief explanations or references are added to some answers.

JAEA Reports

Example of answers to the problems of the 36th examination for the chief engineer of nuclear fuel, 2004

Yachi, Shigeyasu; Nakamura, Jinichi; Amaya, Masaki; Nakajima, Kunihisa; Komuro, Yuichi; Nakajima, Katsuaki*; Kobayashi, Yasuhiko; Sato, Tadashi*; Suga, Shinichi*; Noguchi, Hiroshi; et al.

JAERI-Review 2004-020, 61 Pages, 2004/09

JAERI-Review-2004-020.pdf:1.85MB

This report provides an example of answers to the problems of the 36th Examination for the Chief Engineer of Nuclear Fuel. This examination was done as a national qualification in March 2004. Brief explanations or references are added to some answers.

JAEA Reports

Example of answers to the problems of 31st to 35th examinations for the chief engineer of nuclear fuel, 1999 to 2003

Yachi, Shigeyasu; Sato, Tadashi; Suga, Shinichi*; Komuro, Yuichi; Uchida, Masaaki; Nakajima, Kunihisa; Nakamura, Jinichi; Amezawa, Hiroo; Omura, Hideaki*; Minato, Kazuo; et al.

JAERI-Review 2003-025, 162 Pages, 2003/09

JAERI-Review-2003-025.pdf:5.96MB

The report contains example of answers to the Problems of 31st(1999) to 35th(2003) Examinations for the Chief Engineer of Nuclear Fuel which were conducted as a national qualification examination. Brief explanations or references are given to some answers.

Journal Articles

New technique for the determination of trace elements using multiparameter coincidence spectrometry

Hatsukawa, Yuichi; Toh, Yosuke; Oshima, Masumi; Hayakawa, Takehito; Shinohara, Nobuo; Kushita, Kohei; Ueno, Takashi; Toyoda, Kazuhiro*

Journal of Radioanalytical and Nuclear Chemistry, 255(1), p.111 - 113, 2003/01

 Times Cited Count:11 Percentile:35.63(Chemistry, Analytical)

no abstracts in English

Journal Articles

Isotopic ratio of $$^{129}$$I/$$^{127}$$I in seaweed measured by neutron activation analysis with $$gamma$$-$$gamma$$ coincidence

Toh, Yosuke; Hatsukawa, Yuichi; Oshima, Masumi; Shinohara, Nobuo; Hayakawa, Takehito; Kushita, Kohei; Ueno, Takashi

Health Physics, 83(1), p.110 - 113, 2002/07

 Times Cited Count:9 Percentile:43.33(Environmental Sciences)

no abstracts in English

JAEA Reports

Journal Articles

Measurement of long-lived nuclides by multi-$$gamma$$ ray analysis

Hatsukawa, Yuichi; Toh, Yosuke; Oshima, Masumi; Hayakawa, Takehito; Shinohara, Nobuo; Kushita, Kohei; Ueno, Takashi

KEK Proceedings 2001-14, p.193 - 194, 2001/06

no abstracts in English

Journal Articles

Journal Articles

Journal Articles

Damage evolution in TiC crystals during hydrogen and helium dual-ion beam irradiation

Hojo, Kiichi; *; Furuno, Shigemi*; *; Kushita, Kohei; Sasajima, Naohiko*

Nuclear Instruments and Methods in Physics Research B, 148(1-4), p.720 - 725, 1999/00

 Times Cited Count:4 Percentile:59.27

no abstracts in English

Journal Articles

Radioactivity measurement of $$^{188}$$Re by Cherenkov counting

Kushita, Kohei; J.Du*

Applied Radiation and Isotopes, 49(9-11), p.1069 - 1072, 1998/00

 Times Cited Count:2 Percentile:73.06

no abstracts in English

Journal Articles

EELS analysis of SiC crystals under hydrogen and helium dual-ion beam irradiation

Hojo, Kiichi; *; Furuno, Shigemi; Kushita, Kohei; *; Sasajima, Naohiko*

Nuclear Instruments and Methods in Physics Research B, 141(1-4), p.148 - 153, 1998/00

 Times Cited Count:25 Percentile:11.45

no abstracts in English

Journal Articles

In situ EELS and TEM observation of silicon carbide irradiated with helium ions at low temperature and successively annealed

Hojo, Kiichi; Furuno, Shigemi; Kushita, Kohei; *; *; *

Nuclear Instruments and Methods in Physics Research B, 116, p.382 - 388, 1996/00

 Times Cited Count:27 Percentile:9.65

no abstracts in English

Journal Articles

In situ EELS and TEM observation of boron carbide(B$$_{4}$$C) during hydrogen- and hilium-ion bombardments

Kushita, Kohei; Hojo, Kiichi; Furuno, Shigemi

Microsc. Microanal. Microstruct., 6, p.149 - 157, 1995/02

 Times Cited Count:10 Percentile:39.93(Microscopy)

no abstracts in English

Journal Articles

In-situ EELS and TEM observation of Al implanted with nitrogen ions

Hojo, Kiichi; Furuno, Shigemi; *; Kushita, Kohei; ; *

Microsc. Microanal. Microstruct., 6, p.141 - 147, 1995/02

 Times Cited Count:2 Percentile:75.87(Microscopy)

no abstracts in English

Journal Articles

Electron energy-loss spectroscopy study of amorphization process of graphite bombarded with hydrogen ions and energetic electrons at low temperatures

Kushita, Kohei; Hojo, Kiichi; Furuno, Shigemi

Journal of Electron Microscopy, 44, p.456 - 461, 1995/00

no abstracts in English

30 (Records 1-20 displayed on this page)