[en] From the viewpoint of applicability survey on the magnetic separation using super-conducting magnet in the nuclear fuel cycle system, a basic study has been made to clarify separation characteristics of magnetic chromatography (MC). We developed a computer simulation code to make clear the separation mechanism, and pursued basic experiments to demonstrate magnetic force acting on weakly magnetized fine particles. As a result, with our successfully developed simulator we can accurately simulate the transient behavior of fine particles undergoing both convection (due to fluid flow and magnetic forces) and diffusion. It is also shown that separation can successfully be done on Nd and hypothetical radioactive particles with diameters of several ten nanometers. In our experiments, we could confirm the high intensity and high gradient magnetic field effect of delaying the flow velocity of Nd colloidal particles in an MC column. MC technology will contribute to nuclear fuel cycle systems as an analysis technology of secondary waste free after the next step of R and D is completed for practical application in the future. (author)