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Nagai, Haruyasu; Chino, Masamichi*
Ten Hasseigen Karano Mesosukeru Kakusan Shumireshon; Fukushima Daiichi Genshiryoku Hatsudensho Jiko O Fumaete (Kisho Kenkyu Noto Dai-248-Go), p.1 - 58, 2023/09
no abstracts in English
Terada, Hiroaki; Nagai, Haruyasu
Isotope News, (775), p.44 - 48, 2021/06
no abstracts in English
Tanimura, Yoshihiko; Nishino, Sho; Yoshitomi, Hiroshi; Kowatari, Munehiko; Oishi, Tetsuya
Progress in Nuclear Science and Technology (Internet), 6, p.134 - 138, 2019/01
At the severe nuclear accidents like the Fukushima Daiichi Nuclear Power Plant, various radionuclides will be dispersed into the environment and raise the dose rate. The 
-
measurements of 
ray spectra and identifying radionuclides using the results are important for the radiological protection from both external and internal exposure. For this application a commercially available CdZnTe spectrometer (Kromek GR-1) was characterized at the calibration fields of FRS/JAEA. The angular dependence of the detection efficiency was studied and the efficiency was kept within 15 % degradation in 
135 degree incident angle, which covers 85 % of all. The usable dose range was evaluated and the spectrometer could correctly measure the ray spectra below 200 
Gy/h.
Oka, Kiyoshi
Kikai No Kenkyu, 57(6), p.641 - 649, 2005/06
no abstracts in English
Oka, Kiyoshi
JAERI-Research 2004-009, 225 Pages, 2004/07
JAERI-Research-2004-009.pdf:47.47MB
In the present paper, I describe the necessary approaches and elemental technologies to solve the issues on the system integration of the typical robot systems for maintenance in the nuclear fusion facility and rescue in the accident of the nuclear power plant facilities. These robots work under the intense radiation condition and restricted space in place of human. In particular, I propose a new approach to realize the system integration of the robot for actual use from the viewpoints of not only the environmental and working conditions but also the restructure and optimization of the required elemental technologies with a well balance in the robot system. Based on the above approach, I have a contribution to realize the robot systems working under the actual conditions for maintenance in the nuclear fusion facility and rescue in the accident of the nuclear power plant facilities.
Oka, Kiyoshi; Hiyama, Masayuki*
Keisoku Jido Seigyo Gakkai Rombunshu, 40(1), p.109 - 116, 2004/01
Remote maintenance technology is essential to realize ITER since the reactor components are activated by 14-MeV neutrons and have to be maintained remotely. For this purpose, the JAERI has been conducting remote handling technology development mainly for in-vessel components. On the other hand, a critical accident at the JCO occurred in September 1999, which was the most serious nuclear accident in Japan. Therefore, the JAERI has developed a Radiation-proof Robot (called RaBOT) operating under high radiation field. Under such a background, a variable baseline type distance sensor has been developed for use under the severe conditions such as gamma radiation. The aim of the sensor is to be used for the measurement of the distance between a robot and an object under the severe conditions of the maintenance for fusion plants and atomic disaster. This report describes the outline of the variable baseline type distance sensor and the results of the basic performance test.
Oka, Kiyoshi
Nihon Kikai Gakkai-Shi, 106(1019), p.765 - 768, 2003/10
no abstracts in English
Sakamoto, Ryuichi; Saito, Kimiaki; Tsutsumi, Masahiro; Nagaoka, Toshi
Hoken Butsuri, 36(4), p.297 - 307, 2001/12
There are many factors which affect external exposure in contaminated area: distributions of fallout, compositions of radioactive nuclides, soil conditions, depth profile of radioactivity in soil, rain fall, snow cover, radioactive decay, shielding effects of houses and other structures, de-contamination measures, and the 'occupancy factor' which accounts for the fraction of time that inhabitants spend in different locations. In this study, several important issues concerning these factors have been investigated using field measurements and computational simulations since 1992 in the Chernobyl area. The objectives of the study were: (1) The development of a mobile survey method to collect radiation data of the contaminated area over a wide area in a short time; (2) The verification of a method to infer external doses to the population; (3) The provision of basic data used for the evaluation of external dose due to gamma ray using a Monte Carlo simulation method. (4) Characteristics of the radiation fields in contaminated area. In this report, the results were summerized.
Yamahara, Takeshi
Dai-26, 27-Kai NS Netto Anzen Kyaraban Koenroku, p.1 - 30, 2001/10
no abstracts in English
Kobayashi, Tadayoshi; Miyajima, Kazutoshi; Yanagihara, Satoshi
Nihon Robotto Gakkai-Shi, 19(6), p.706 - 709, 2001/09
no abstracts in English
JNC TJ4420 2000-002, 794 Pages, 2000/03
JNC-TJ4420-2000-002.pdf:23.42MB
no abstracts in English
Kinase, Sakae; Takahashi, Tomoyuki*; Sato, Satoshi*; Yamamoto, Hideaki; Saito, Kimiaki
no journal, ,
no abstracts in English
Nozawa, Takashi
no journal, ,
no abstracts in English
Saito, Kimiaki
no journal, ,
no abstracts in English
Hirouchi, Jun; Watanabe, Masatoshi*; Hayashi, Naho; Nagakubo, Azusa; Matsui, Yasuto*; Yoneda, Minoru*; Takahara, Shogo
no journal, ,
no abstracts in English
