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Ichimura, Takahito; Takahashi, Iku; Iwasa, Kaoru; Nozawa, Yoshihiko
JAEA-Technology 2017-037, 322 Pages, 2018/03
JAEA-Technology-2017-037.pdf:69.64MB
The facility construction of the Okuma Analysis and Research Center is being promoted on the basis of the first phase facilities and the second stage facilities in accordance with the road map prescribed by the government in order to promote the decommissioning of the Fukushima Daiichi Nuclear Power Station is there. As the first phase facility, we designed "Radioactive Material Analyses and Research Facility Laboratory-1" which analyses mainly low-medium radiation doses radioactive waste (rabble, logging tree (incineration ash), dismantled waste etc), "Administrative Building" which is an office building, Site decontamination, Exterior and Utility equipment, etc. In addition to radiation protection and prevention of pollution at the time of construction, it is designed to reduce radiation exposure from outdoor pollution sources of residents after the facility starts to operate, shielding for the reliability of the analysis results, suppression and prevention of outside air inflow, etc.
Matsuda, Norihiro; Nakashima, Hiroshi; Kasugai, Yoshimi; Sasamoto, Nobuo*; Kinno, Masaharu*; Kitami, Takayuki; Ichimura, Takahito; Hori, Junichi*; Ochiai, Kentaro; Nishitani, Takeo
Journal of Nuclear Science and Technology, 41(Suppl.4), p.74 - 77, 2004/03
In high power proton accelerator facilities, concrete shield can be highly activated, which makes maintenance work quite difficult. So, a low-activationized concrete (limestone concrete) is to be partially adopted as a concrete shield for Japan Proton Accelerator Research Complex (J-PARC) aiming at reducing 
-ray exposure dose during maintenance period. A new quantity, 
Na-equivalent, was introduced as a criterion to assure effectiveness of the low-activationized concrete. In order of its verification, powdered low-activationized concrete and ordinary one were irradiated using FNS at JAERI. The measurements were analyzed by a shielding design code system being used for J-PARC, showing that the calculations reproduce the measured induced activity within a factor of 2. Furthermore, by using the same code system, -ray exposure dose was calculated for the configuration of J-PARC to find out that -ray exposure dose by the low-activationized concrete was about 10 times lower than that by the ordinary concrete in a period of less than a few days after operation.
Yoshimura, Aya*; Ichimura, Takahito; Kitami, Takayuki; Horiguchi, Takashi; Kawama, Itsuo*; Ouchi, Hajime*; Tsunokake, Hisao*
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no abstracts in English
Kubo, Takashi; Kitami, Takayuki; Itabashi, Hideharu; Horiguchi, Takashi; Ichimura, Takahito
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Horiguchi, Takashi; Kitami, Takayuki; Itabashi, Hideharu; Ichimura, Takahito; Kubo, Takashi
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Ichimura, Takahito; Kitami, Takayuki; Horiguchi, Takashi; Kawama, Itsuo*
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Kawama, Itsuo*; Ichimura, Takahito; Kitami, Takayuki; Horiguchi, Takashi; Aoki, Yusuke*
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no abstracts in English
