JAEA Reports on Experiments of Radiation Resistance 2011.04.19

Reports of irradiation experiments in gamma radiation environment by JAEA Naka Fusion Institute

by Hisaaki Kudo, Associate Professor, the University of Tokyo

1.
Continuous running test of radiation resistance motor driving equipment under high ray irradiation
Obara, Kenjiro; Kakudate, Satoshi; Yagi, Toshiaki; Morishita, Norio; Shibanuma, Kiyoshi
Report Number: JAEA-Technology 2006-023
PDF: http://jolissrch-inter.tokai-sc.jaea.go.jp/pdfdata/JAEA-Technology-2006-023.pdf

2.
Development of radiation-hard ultrasonic inspection probes for ITER vacuum vessel
Koizumi, Koichi; Nakahira, Masataka; Oka, Kiyoshi; Obara, Kenjiro; Itou, Yutaka*; Morita, Yosuke; Tada, Eisuke
Report Number: JAERI-Tech 96-041
Number of Pages: 66
Issued Year / Month: 1996/10
Language: Japanese
Abstract:
The vacuum vessel of International Thermonuclear Experimental Reactor (ITER) is designed to be first safety barrier for tritium confinement. In order to assure the reliability ITER vacuum Vessel, non-destructive inspection of weld joints during in-service-inspection and after the rewelding of vessel sector for the replacement of TF coil is indispensable. Since this non-destructive inspection has to be performed by remote handling system under the intensive gamma-ray environment of more than 10(sup 6) R/h (2.58 x 10(exp 2) C/kg(center dot)h) due to the radio activation of vacuum vessel, the development of radiation-hard inspection probes to satisfy high detectability, high sensitivity and sufficient long life time is essential to assure the reliability, of vacuum vessel. Based on this requirement, much efforts have been devoted for the development and testing of radiation-hard ultrasonic inspection probes which can be tolerable for more than 10(exp 9) rad (10(exp 7) Gy) at a dose rate of 10(exp 6) R/h. Through a series of quality improvements and qualification tests, two types of new ultrasonic inspection probes which have sufficient and stable detectability up to 10(exp 9) rad have been successfully developed. This report describes the structural design and irradiation test results of radiation-hard UT probes.
Number of Abstracts: 240929 PDF: JAERI-Tech-96-041.pdf:2.6MB

3.
Irradiation tests of critical components for remote handling system in gamma radiation environment
Obara, Kenjiro; Kakudate, Satoshi; Oka, Kiyoshi; Furuya, Kazuyuki; Taguchi, Kou; Tada, Eisuke; Shibanuma, Kiyoshi; Koizumi, Koichi; Okawa, Yoshinao; Morita, Yosuke; Yagi, Toshiaki; Yokoo, Noriko;
Report Number: JAERI-Tech 96-011
Number of Pages: 111
Issued Year / Month: 1996/03
Language: English
Abstract:
This report covers the gamma ray irradiation tests according to the Agreement of ITER R and D Task (T35) in 1994 and describes radiation hardness of the standard components for the ITER remote handling system which are categorized into the robotics (Subtask-1), the viewing system (Subtask-2) and the common components (Subtask-3). The gamma ray irradiation tests have been conducted using No.2 and No.3 cells at the cobalt building of Takasaki Establishment in JAERI. The radiation source is cobalt sixty (Co-60), and the maximum dose rate of No.2 and No.3 cells is about 1×10(sup 6) R/h and 2×10(sup 6) R/h, respectively. The environmental conditions of the irradiation tests are described below and all of components excepting electrical wires have been tested in the No.2 cell. [No.2 cell : Atmosphere and ambient temperature No.3 cell : Nitrogen gas and 250deg C] As a whole, many of components have been irradiated up to the rated dose of around 1×10(sup 10) rads and the following main results are obtained. The developed AC servo motor and periscope for radiation use have shown excellent durability with the radiation hardness tolerable for more than 10(sup 9) rads. An electrical connector compatible with remote operation has also shown no degradation of electrical characteristics after the irradiation of 10(sup 10) rads. As for polyimide insulated wires, the mechanical and electrical characteristics are not degraded after the irradiation of 10(sup 9) rads and more radiation hardness can be expected than the anticipation. On the contrary, standard position sensors such as rotary encoder show extremely low radiation hardness and further efforts have to be made for improvements.
Number of Abstracts: 240330 PDF: JAERI-Tech-96-011.pdf:5.9MB

4.
Irradiation tests of critical components for remote handling in gamma radiation environment
Obara, Kenjiro; Kakudate, Satoshi; Oka, Kiyoshi; Furuya, Kazuyuki; Taguchi, Kou; Tada, Eisuke; Shibanuma, Kiyoshi; Okawa, Yoshinao; Morita, Yosuke; Yokoo, Noriko; Seki, Masahiro
Report Number: JAERI-Tech 94-003
Number of Pages: 73
Issued Year / Month: 1994/08
Language: English
Abstract:
Since the fusion power core of a D-T fusion reactor will be highly activated once it starts operation, personnel access will be prohibited so that assembly and maintenance of the components in the reactor core will have to be totally conducted by remote handling technology. Fusion experimental reactors such as ITER require unprecedented remote handling equipments which are tolerable under gamma radiation of more than 10(exp 6) R/h. For this purpose, the Japan Atomic Energy Research Institute (JAERI) has been developing radiation hard components for remote handling purpose and a number of key components have been tested over 10(exp 9) rad at a radiation dose rate of around 10(exp 6) R/h, using Gamma Ray Radiation Test Facility in JAERI-Takasaki Establishment. This report summarizes the irradiation test results and the latest status of AC servo motor, potentiometer, optical elements, lubricant, sensors and cables, which are key elements of the remote handling system.
Number of Abstracts: 220612 PDF: JAERI-Tech-94-003.pdf:3.82MB



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