Abstract: THE CASCADE TEST OF REMOVING Sr FROM SIMULATED HLLW BY CROWN ETHER DICYCLOHEXANO-18-CKOWN-6Wang Qiuping;Wang Jianchen;Song Chongli;Tang Wencheng(Institute of Nuclear Energy Technology,TsingHua University ,P.O.Box1021,Beijig 102201)Abstract:The remaining radioactive species in HLLW after actinides removal are mainly~(90) Sr and~(137)Cs. The further removal of these two nuclides will transform HLLW into intermediate or low level liguid waste, In this work, the inactive cascade test is performed for Sr removal with crown ether dicyclohexano-18-crown- 6 (DCH18C6)from the simulated HLLW from which actinides have been removed by TRPO process.The simulated HLLW, after 3.4 times dilution, is used as feed solution in which the HNO_3 concentration is adjusted to 1.0mol/l.The whole process con sists of 10 extraction,2 scrubbing and 4 stripping stages. The removing ratio of Sr is more than 98.7%. The profile of Sr, K, Mo and nitric actinides in various stages and their distribution in process stream solutions are presented.Keywords: DCH18C6 HLLW Sr Separation