[en] The EFM1 (extended fuel motion) test was performed in the CABRI-FAST in-pile experimental program carried out between 1992 and 1995. The aim of the test was to study fuel relocation behavior under a continued fuel heating condition beyond fuel disruption, which is one of the main subjects of the program. In this study, various experimental data such as transient signals from the neutron hodoscope, thermocouples, inlet/outlet flowmeters, as well as destructive and non-destructive post-test examination results were analyzed in detail. As a result of this study, the event sequence of fuel disruption, dispersal and freezing during the transient have been clarified. We confirmed that fuel mobility is highly dependent on fuel enthalpy. Although local fuel relocation can take place along a gradual increase of fuel mobility under a mild fuel heating condition, significant axial relocation can only take place after the fuel obtain a certain enthalpy level. Under a continued heating condition, pre-formed fuel blockage in the upper region can disappear resulting in further fuel relocation with possible fuel re-melting and structure failure. Another result of this study is that detailed data evaluation, key issues for future study using an analytical model for fuel dispersal and freezing have also been identified. (author)