Under the sponsorship of the Ministry of International Trade and Industry (MITI) of Japan, the Nuclear Power Engineering Corporation (NUPEC) has investigated the seismic behavior of a Reinforced Concrete Containment Vessel (RCCV) through scale-model testing using the high-performance shaking table at the Tadotsu Engineering Laboratory. A series of acceleration time histories, representing design level seismic motions, are sequentially applied to the test model to evaluate design methods and structural performance under design level seismic loads. These tests are then followed by another series of tests using increasing amplifications of the seismic input until structural failure occurs in the test model to evaluate margins of safety for structural failure. In a cooperative program with NUPEC, the United States Nuclear Regulatory Commission (USNRC), through Sandia National Laboratories (SNL), is conducting analytical research on the seismic behavior of RCCV structures. As part of this program, preand post-test analytical simulations of the scale model tests are performed by ANATECH Corp. Previous papers at SMiRT (James, et. al. August 1999) and ICONE (James, et. al. April 2000) conferences have presented results of these simulations for the preand postdesign level tests. This paper describes the analytical simulations for the failure level tests on the RCCV test model. These simulations consider 3-dimensional time history analyses for reinforced concrete subjected to extensive, cyclic damage leading to structural collapse.