Establishing criteria for reuse of disaster wastes contaminated by the Fukushima Daiichi NPP accident

Takeda, Seiji ; Takai, Shizuka ; Kimura, Hideo

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.