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Wainwright, Haruko*; Seki, Akiyuki; Mikami, Satoshi; Saito, Kimiaki
44th Annual waste management conference (WM 2018); Nuclear and industrial robotics, remote systems and other emerging technology, Vol.8, p.5013 - 5017, 2018/08
A Bayesian hierarchical modeling approach was developed to integrate multiscale datasets, and also to estimate the spatial distribution of air dose rates in high resolution over space. In this study, we aim to extend this approach and predict the area of the evacuation zone in the future. We coupled the integrated map with the data-driven ecological decay model. Results show that the area of evacuation zone will shrink significantly in the next twenty years.
Takai, Shizuka; Sawaguchi, Takuma; Takeda, Seiji
Proceedings of International Waste Management Symposia 2018 (WM2018) (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.
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
. 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.