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 a...