除去土壌問題を巡る公共的討議における議論フレームの効果―集団討議実験を用いた検討―

<p>The final disposal of the removed soil from the decontamination works of the Fukushima Daiichi Nuclear Power Plant accident is to be conducted outside of Fukushima prefecture by 2045. The decontaminated soil is managed in the interim storage facility in Okuma and Futaba town, Fukushima prefecture. For conducting the final disposal, reducing the amount of the soil by recycling the low-contaminated removed soil is necessary. To proceed with this policy, public deliberation is required, where citizens participate and discuss the issue. This study aimed to examine the effects of the discussion frame on group decisions, focusing on whether minorities' opinions were reflected. Additionally, we explored how opinions on the issue were changed through the discussions. A group discussion experiment about the final disposal was conducted, manipulating the discussion frame to be competitive or comprehensive. In the competitive frame condition, participants were required to refute their opponents and decide on the pros or cons of the final disposal outside Fukushima. On the contrary, in the comprehensive frame condition, they were required to listen to opponents respectfully and reach compromise decisions. The result demonstrated that some groups in the comprehensive frame condition made decisions including minorities' opinions, while groups in the competitive frame condition reflected only majority opinions. Moreover, the results indicated that most groups in both conditions positively changed their opinion on recycling the low-contaminated removed soil. The significance of designing public deliberation on the final disposal of the decontaminated soil outside of Fukushima was discussed.</p>