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Journal Articles

Distribution of radioactive nuclides of boring core samples extracted from concrete structures of reactor buildings in the Fukushima Daiichi Nuclear Power Plant

Maeda, Koji; Sasaki, Shinji; Kumai, Misaki; Sato, Isamu; Suto, Mitsuo; Osaka, Masahiko; Goto, Tetsuo*; Sakai, Hitoshi*; Chigira, Takayuki*; Murata, Hirotoshi*

Journal of Nuclear Science and Technology, 51(7-8), p.1006 - 1023, 2014/07

 Times Cited Count:11 Percentile:72.25(Nuclear Science & Technology)

Since the start of the severe accident at the Fukushima Daiichi Nuclear Power Plant in March 2011, concrete surfaces within the reactor buildings have been exposed to radioactive contaminants. Released radiation sources still remain too high to permit entry into some areas of the RBs to allow the damage to be assessed and to allow carrying out the restoration of lost safety functions, decommissioning activities, etc. In order to clarify the situation of this contamination in the RBs, 18 samples were subjected to analyses to determine the surface radionuclide concentrations and to characterize the radionuclide distributions in the samples. Decontamination tests on the sample of Unit 2 were conducted to reduce the levels of radioactivity present near the sample surface. As a result of the tests, the level of radioactivity of the sample was reduced with the removal of 97% of the contamination present near the sample surface.

Journal Articles

Results of detailed analyses performed on boring cores extracted from the concrete floors of the Fukushima Daiichi Nuclear Power Plant reactor buildings

Maeda, Koji; Sasaki, Shinji; Kumai, Misaki; Sato, Isamu; Osaka, Masahiko; Fukushima, Mineo; Kawatsuma, Shinji; Goto, Tetsuo*; Sakai, Hitoshi*; Chigira, Takayuki*; et al.

Proceedings of International Nuclear Fuel Cycle Conference; Nuclear Energy at a Crossroads (GLOBAL 2013) (CD-ROM), p.272 - 277, 2013/09

Oral presentation

Basic data acquisitions for development of remote decontamination techniques, 1; Project outline and basic data acquisition plan

Yaita, Yumi*; Sakai, Hitoshi*; Endo, Hiroshi*; Otani, Tomomi*; Takahashi, Yoshiaki*; Oikawa, Kageharu*; Murata, Hirotoshi*; Fukushima, Mineo; Kawatsuma, Shinji

no journal, , 

no abstracts in English

Oral presentation

Basic data acquisitions for development of remote decontamination techniques, 5; Summary of basic data acquisition results and future plan

Onitsuka, Hironori*; Yano, Masahiro*; Nemoto, Yuji*; Takahashi, Takuya*; Kaneda, Masayuki*; Murata, Hirotoshi*; Chigira, Takayuki*; Fukushima, Mineo; Kawatsuma, Shinji

no journal, , 

no abstracts in English

Oral presentation

Development of remote decontamination techniques for reactor building, 8; Analysis of Concrete core sample from Operation Floor of Unit 2

Higashiuchi, Atsushi; Maeda, Koji; Otani, Akira; Sasaki, Shinji; Katsuyama, Kozo; Chigira, Takayuki*; Murata, Hirotoshi*

no journal, , 

no abstracts in English

Oral presentation

Development of remote decontamination techniques for reactor building, 2; Analysis of concrete core sample from south side floor of first floor in Unit 1

Higashiuchi, Atsushi; Maeda, Koji; Sasaki, Shinji; Katsuyama, Kozo; Otani, Akira; Chigira, Takayuki*; Murata, Hirotoshi*

no journal, , 

In the development of remote decontamination technology of the reactor building, we were carried out a detailed analysis of concrete samples (hereinafter referred to as "core sample") taken from TEPCO Fukushima Daiichi Nuclear Power Station (hereinafter referred to as "1F") Unit 1 reactor building first floor south side floor, etc..

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