 Its main application is the simulation of atomic experiences and the maintenance of the French nuclear defence force, using the results of true nuclear tests (between 1956 and 1995, most of them in the French Nuclear Test Plant in the Pacific) and the new results obtained from the LMJ("Laser Mega-Joule") built in continental France.This is the end of a second generation of evolutions, the next generation will reach about 100 TeraFLOPS (expected in 2009) using processors with more internal cores and a new central scheduling system allowing asymmetric operation on a variable number of processors, for easier upgrades, lower maintenance cost, and more experiences requiring different computing scales, without having to rebuild the whole cluster.This new system should be renamed "Tera-100".