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Journal Articles

Dose estimation in recycling of decontamination soil due to Fukushima NPS accident as coastal levees

Takai, Shizuka; Sawaguchi, Takuma; Takeda, Seiji

Proceedings of International Waste Management Symposia 2018 (WM 2018) (Internet), 14 Pages, 2018/03

After the Fukushima Nuclear Power Station accident, large quantities of radiocesium-contaminated soil generated from decontamination activities have been stored in the Fukushima prefecture. To complete the final disposal of decontamination soil, the Ministry of the Environment of Japan presented policy to reduce the disposal volume by using low-level decontamination soil as recycled materials. The use will be limited to civil engineering structures in public projects, such as coastal levee and road embankment. However, there has been no example or safety assessment of recycling of decontamination soil. To contribute to guideline development for the recycling by the Ministry of the Environment, we conducted the safety assessment for recycling of decontamination soil as coastal levee. First, we evaluated additional doses to workers and the public in the case of construction and service of coastal levee. From the result, the radioactive cesium concentration level of recycled materials was derived to be 6,800 Bq/kg. For general designs of coastal levee in Japan, additional doses to the public in the case of service were below 0.01 mSv/y with derived radioactivity level. Finally, we confirmed additional doses in the case of disaster to be below 1 mSv/y.

Journal Articles

Challenges for enhancing Fukushima environment resilience, 6; The Use of the reclaimed materials derived from the removed soil on the basis of the security

Okada, Takashi; Takeda, Seiji; Nakata, Hisakazu

Nippon Genshiryoku Gakkai-Shi, 59(10), p.603 - 607, 2017/10

Because the reclaimed material is used, quantity of disposal of the removal soil can decrease. It is a strategic key to utilize the reclaimed material. As for this report, it is explained to about the fundamentals of the safe use of the reclaimed materials derived from the removed soil.

Journal Articles

Journal Articles

Challenges for enhancing Fukushima environmental resilience, 4; Development of physical and heat treatment methods on aiming at decontamination, volume reduction and reuse of contaminated soil

Yaita, Tsuyoshi; Honda, Mitsunori; Shimoyama, Iwao; Ito, Kenichi*; Mampuku, Yuzo*; Tsuji, Takuya; Matsumura, Daiju

Nippon Genshiryoku Gakkai-Shi, 59(8), p.483 - 487, 2017/08

no abstracts in English

Oral presentation

Development of volume reduction treatment technology for removal soil

Kato, Mitsugu

no journal, , 

no abstracts in English

Oral presentation

Volume reduction of cesium contaminated soil by high gradient magnetic separation using superconducting magnet

Nishijima, Shigehiro*; Yukumatsu, Kazuki*; Horie, Hiroki*; Nomura, Naoki*; Akiyama, Yoko*; Mishima, Fumihito*; Sekiyama, Tomio; Mitsui, Seiichiro; Kato, Mitsugu

no journal, , 

The amount of Cs contaminated soil originating from decontamination work after the accident of Fukushima Dai-ichi Nuclear Power Plant is estimated as large as 20 million m$$^3$$ in maximum, and its volume reduction is required to optimize final disposal of the contaminated soil outside Fukushima pref. We have proposed a new method to reduce the volume of the contaminated soil by the combination of wet classification and high gradient magnetic separation (HGMS). In this study, we have been investigating selective separation of paramagnetic 2:1 type clay minerals and mica, which strongly absorb and fix Cs ions, by superconducting magnetic separation on silt/clay suspension as a volume reduction technique. We conducted magnetic separation experiments of contaminated soil in Fukushima utilizing a superconducting magnet based on results of particle trajectory simulation for various particle size.

Oral presentation

Safety assessment for reuse of removed soil

Sawaguchi, Takuma; Takai, Shizuka; Umezawa, Katsuhiro; Takeda, Seiji; Okada, Takashi

no journal, , 

no abstracts in English

Oral presentation

Approach of radiation protection on recycling materials contaminated by radionuclides

Miwa, Kazuji; Iimoto, Takeshi*

no journal, , 

ICRP Publ.103 shows that reference levels are used for radiation protection of public exposure in existing exposure situation. However, there is no specific description about actual operation of reference levels. There is a possibility that a more rational radiation protection concept can be applied depending on the scale of environmental pollution in the existing exposure situation. This study proposes variation of radiation protection concept for public exposure assuming reusing radiation contaminated material which is in existing exposure situation.

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