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Sector of Fukushima Research and Development
JAEA-Evaluation 2015-004, 96 Pages, 2015/09
JAEA-Evaluation-2015-004.pdf:2.95MB
Japan Atomic Energy Agency (JAEA) consulted an assessment committee, "Evaluation Committee of Research and Development Activities for Fukushima Environment" (Committee) for ex-post and ex-ante evaluations of "Research and Development of the technologies for Fukushima Environment Recovery" in accordance with national guidelines and JAEA's regulations including "General Guideline for the Evaluation of Government Research and Development (R&D) Activities" by Cabinet Office. In response to the JAEA's request, the Committee evaluated the R&D activities during the 2nd Period of Mid-Term Research Plan (from March 2011 to March 2015) as ex-post evaluation and the R&D plans during the 3rd Period of Mid- to Long-Term Research Plan (from April 2015 to March 2022) as ex-ante evaluation. The Committee evaluated the R&D activities and programs based on the explanatory materials prepared by JAEA and its oral presentations with Q&A sessions. This report presents the results of the evaluation.
Sawaguchi, Takuma; Takeda, Seiji; Kimura, Hideo; Tanaka, Tadao
Hoken Butsuri, 50(1), p.36 - 49, 2015/03
It is desirable that the disaster wastes contaminated by radioactive cesium after the severe accident at the Fukushima Nuclear Plant are reused as much as possible in order to minimize the quantity to be disposed of. Ministry of the Environment showed the policy that the wastes containing cesium of higher concentration than the clearance level (100 Bq/kg) were reusable as materials of construction such as subbase course materials of pavements under controlled condition with measures to lower exposure doses. In this study, in order to provide technical information for making a guideline on the use of contaminated concrete materials recycled from disaster wastes as pavement, doses for workers and the public were estimated, and the reusable concentration of radioactive cesium in the wastes was evaluated. It was shown that the external exposure of the public (children) residing near the completed pavement gave the minimum radiocesium concentration in order to comply with the dose criteria. The recycled concrete materials whose average concentration of cesium lower than 2,700 Bq/kg can be used as the subbase course materials of pavements.
Tanaka, Masaru*; Gofuku, Akio*; Ishizaka, Kaoru*; Sato, Kazuhiko; Nagahama, Yoji
JAEA-Research 2014-019, 103 Pages, 2014/12
JAEA-Research-2014-019.pdf:12.1MB
We had been conducting a research on risk perception and confidence-building among stakeholders regarding environmental remediation of Uranium mine site and disposal of industrial waste from FY 2007. FY 2011, we study how the Great East Japan Earthquake and Fukushima nuclear accident affects public risk perception. Therefore, a questionnaire survey on public risk perception of environmental remediation of Uranium mine site and disposal of the industrial waste in Okayama prefecture had been carried out. Another questionnaire survey on public risk perception of the disposal of disaster waste for residents in Okayama prefecture has been carried out. Following are some of the results: (1) For risk perception regarding environmental remediation of Uranium mine site, "knowledge of radiation" and "Concern about radioactive material" and "Information literacy" did not change significantly. Conversely trust in "Public administration" and "facility owner" and "Science and technology" was decreased significantly. (2) For risk perception regarding disaster waste, many people recognize the need for wide area disposal of disaster waste. Conversely, many residents are concerned about radioactive materials.
Takeda, Seiji; Takai, Shizuka; Kimura, Hideo
no journal, ,
Reuse of slightly contaminated disaster wastes is effective for volume reduction of disaster wastes. Reuse of the contaminated wastes should be carried out based on ensuring the safety of radiation for the workers and the public by dose estimation approach. As a first step, we derived the cesium concentration for the limited purposes of reuse based on two types of scenarios; reuse for subbase course materials of pavements and that for embankment materials of seaside protection forest. The calculated results concluded that concrete wastes less than about 3,000 Bq/kg can be used for two types of scenarios under the design conditions such as thickness of shielding materials. As a next step, it is important to confirm the validity of the criteria of 100 Bq/kg by the effective dose estimation for comprehensive scenarios relate to reusing wooden wastes. In this study, we estimated the dose for reuse of wooden wastes to confirm the validity of 100 Bq/kg in the present reuse.
Maekawa, Akihiro*; Takase, Kazuyuki*; Saito, Kimiaki; Machida, Masahiko; Kurikami, Hiroshi; Kusakabe, Kazuaki*; Hashimoto, Kosuke*; Inoue, Hiromi*
no journal, ,
This study examined the possibility of estimating cesium-137 concentrations in disaster waste from air dose rates by using the Monte Carlo radiation transport code PHITS.