RADIOACTIVE WASTE SOLIDIFICATION METHOD AND SOLIDIFICATION DEVICE

PROBLEM TO BE SOLVED: To efficiently solidify radioactive waste liquid containing sodium sulfate without allowing unreacting sulfate ions to remain therein, thereby obtaining a solidified body having high water resistance and extremely little affecting a buried artificial barrier. SOLUTION: In this radioactive waste liquid solidification method for solidifying radioactive waste liquid containing sodium sulfate, solidification procedure is divided into an insolubilization process for insolubilizing sulfate ions in the waste liquid while heating the waste liquid and a solidification process for solidifying the insolubilized waste liquid. Temperature variation is measured accompanying endothermic reaction of the waste liquid in the insolubilization process. Completion of the solidification process is determined based on the transition of temperature. After the completion of insolubilization, heating electric power is reduced and switching takes place to the solidification process (turning into water glass → polymerization solidification). COPYRIGHT: (C)2006,JPO&NCIPI