METHOD FOR REDUCING RADIOACTIVE CESIUM IN INCINERATION ASH AND METHOD FOR STORING WATER CONTAINING RADIOACTIVE CESIUM

摘要

PROBLEM TO BE SOLVED: To provide a method for reducing radioactive cesium from incineration ash containing radioactive cesium, and also to provide a method for safely storing water containing radioactive cesium.SOLUTION: A method for reducing radioactive cesium contained in incineration ash puts incineration ash containing radioactive cesium into an extraction container and stores water in a heating container, in an apparatus in which the heating container is placed in a bottom part, the extraction container is placed in a middle part, and a condenser is placed in an uppermost part. Then, the method repeats the steps of: (A) heating the heating container to generate moisture vapor; (B) cooling the moisture vapor in the condenser to generate condensed water; (C) feeding the condensed water into the extraction container; (D) discharging water into the heating container when it accumulates up to a predetermined level in the extraction container; and (E) accumulating the water in a state where radioactive cesium is dissolved in the water. A method for storing water containing radioactive cesium lets water containing radioactive cesium be absorbed in a high water-absorbing material and be filled in a storage container with the water in a solid phase state.