Abstract: The fuel subassembly total instantaneous blockage accident can cause core structure and fuel melt, even lead to a core disrupt accident(CDA) in fast reactor. A well-planned program to study such a severe accident has been implemented all over the world. The total instantaneous blockage accident(TIB) study progress was summarized in the paper. The most important SCARABEE-N inpile tests in TIB fields were reviewed, also various out-of pile backup tests. The SCARABEE BE+ group and APL group, which were directly linked to TIB scenario, were compared for the different test conditions and phenomena. Many analysis models and computer codes developed in parallel with SCARABEE program were presented, followed by using SCARABEE results for code verification and engineering practice.