It's surprising that this restriction continues to linger at all. The newest nuclear warhead models in the US arsenal were developed in the 1970s, when supercomputer performance was well below 1 gigaflop. When the US stopped testing nuclear warheads in 1992, top end supercomputers were under 10 gigaflops. The only thing the US arsenal needs faster computers for is simulating the behavior of its aging warhead stockpile without physical tests, which is not going to matter to a state building its first nuclear weapons.