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Journal Articles

7.2.3 Towards implementation of Fukushima environmental remediation

Miyahara, Kaname; Kawase, Keiichi

Genshiryoku No Ima To Ashita, p.159 - 167, 2019/03

This manuscript overviews lessons learned from decontamination pilot projects towards implementation of regional remediation after the environmental contamination due to the Fukushima Daiichi Nuclear Power Plant Accidents.

Journal Articles

Safety assessment for recycling of soil generated from decontamination activities

Takeda, Seiji

Str${aa}$levern Rappot 2018:4 (Internet), p.62 - 64, 2018/04

The widespread environment was contaminated by radioactive cesium discharged by the severe accident of the Fukushima Daiichi Nuclear Power Station. Decontamination measures have been implemented extensively, resulting in the generation of large volume of decontamination soil that has been placed in temporary storage. To reduce the volume of decontamination soil, it can be effective to recycle the soil as construction material. This report shows the concept of safety assessment method for recycle to public projects in which the management system and allocation of responsibility are clarified, scenario construction and parameter selection, and also the results of safe assessment for the recycle to coastal levees.

Journal Articles

Implementation of decontamination technologies appropriate to Japanese boundary conditions

Kawase, Keiichi

Global Environmental Research (Internet), 20(1&2), p.83 - 90, 2017/03

Major challenges to implementing full-scale environmental decontamination were the absence of real-world examples and also lack of experience in planning and implementing decontamination technology appropriate to the physical and social boundary conditions in both Japan and Fukushima. The Japan Atomic Energy Agency was thus charged with conducting a range of Decontamination Pilot Project to examine the applicability of decontamination technologies, with a special focus on reducing dose rates and thus allowing evacuees to return to re-establish their normal lifestyles as quickly as possible, whilst simultaneously maintaining worker safety. In this report, re-edit the report of the Decontamination Pilot Project (Nakayama et al.,2014), do the commentary for the decontamination technology.

Journal Articles

Decontamination and volume reduction of cesium-contaminated soil by combining soil solidification with interpolyelectrolyte complex and wet classification

Yamashita, Yuji*; Yanase, Nobuyuki; Nagano, Tetsushi; Mitamura, Hisayoshi; Naganawa, Hirochika

Journal of Radioanalytical and Nuclear Chemistry, 305(2), p.583 - 587, 2015/08

 Times Cited Count:4 Percentile:40.75(Chemistry, Analytical)

We propose a method for the decontamination and waste volume reduction of cesium-contaminated soil. The soils were solidified with an interpolyelectrolyte complex solution and classified into several size fractions by wet sieving. $$gamma$$-ray spectrometry of these fractions showed that the distribution ratio of the activity concentration of coarse soil particles decreased, whereas that of soil particles under 0.075 mm increased relative to reference samples. Results show that the fine soil particles, on which radioactive cesium accumulates, were removed from the surface of the coarse soil particles during, and remained in the washing water.

Oral presentation

Cesium-137 wash-off associated with soil erosion on various land uses in Fukushima

Yoshimura, Kazuya; Wakiyama, Yoshifumi*; Onda, Yuichi*; Takase, Tsugiko*

no journal, , 

Oral presentation

Actions for environmental restoration of Fukushima

Okada, Takashi

no journal, , 

JAEA had initiated the Cabinet Office commissioned Decontamination Pilot Project, immediately after Fukushima Daiichi NPS accident. These results contributed to the decontamination-related guidelines that the government established. According to these guidelines, the government and municipalities carried out environmental decontamination. The removal soil and the waste occurring by cleanup in Fukushima are estimated to be 16M-22M m$$^{3}$$. The government decided to keep these huge the removal soil and the waste intensively in the Interim Storage Facility. In addition, by 30 years, it decided to let these disposal complete out of Fukushima. A key to realize disposal out of Fukushima is to reduce quantity of disposal. The government decided to utilize the removal soil for relatively low concentration of radioactivity based on a safe evaluation in public projects where its reuse will be limited to structural foundations.

Oral presentation

Removal of radioactive cesium from Fukushima contaminated soil by hot-pressing water extraction in a column

Yin, X.; Koma, Yoshikazu; Inaba, Yusuke*; Takeshita, Kenji*

no journal, , 

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