[en] Actual trends in nuclear power plants design, construction and operation put more and more pressure upon nuclear fuel resources, leading to an active and continuous increasing interest in advanced fuel cycles development. Main goals are to extend the nuclear fuel resources utilization, to reduce the amount of radioactive waste produced by nuclear reactors operation and moreover to enhance the proliferation resistance. Nowadays, the world faces huge challenges related to the energy production and the corresponding security issues. One of the most interesting alternatives existing today to replace standard Uranium fuel cycle in nuclear power reactors, offering a variety of significant strategic and economic advantages, is Thorium. A set of Thorium-based fuels and one Uranium-based fuel (as reference case) were considered, according to existing references in the domain; considered fuels have been loaded into the elements of SEU43 fuel bundle developed in INR Pitesti. Fuels characteristics related on the proliferation resistance issue have been investigated