Very deep submicron and nanometer technologies have increased notably integrated circuit (IC) sensitiveness to radiation. Soft errors are currently appearing into ICs working at earth surface. Hardened circuits are currently required in many applications where Fault Tolerance (FT) was not a requirement in the very near past. The use of platform FPGAs for the emulation of single-event upset effects (SEU) is gaining attention in order to speed up the FT evaluation. In this work, a new emulation system for FT evaluation with respect to SEU effects is proposed, providing shorter evaluation times by performing all the evaluation process in the FPGA and avoiding emulator-host communication bottlenecks.