Performance evaluation of a solidification process for highly concentrated radiation contaminated surplus soil

Ishiyama, Shintaro; Otani, Kazuhisa*; Yamashita, Manabu*

For the purpose of performance evaluation of the field portable (360 mmD 360 mmH 800 mmW) and fixed mount type filter presses(1880 mmD 2140 mmH 9085 mmW) for soil consolidation in radiation contaminated soil washing process, decontamination water washing test and radiation assessment for these filter presses were conducted with over 570,000 Bq/kg radiation contamination soil in FUKUSHIMA and the following results were derived; (1) About 10% volume reduction was achieved in soil consolidation process by the field portable filter press with 1.3-6.7 times high condensation of radiation density. (2) During soil consolidation, core dose in the field portable and fixed mount type were evaluated as 2.5 and 196 Sv/h, respectively, and exposed dose in ordinary maintenance and inspection in excess of radiation protection guide level, especially for the fixed mount type in terms of radiation protection.