To answer your question lets ask ourselves the question - DO WE NEED TO CONDUCT MORE NUCLEAR TESTS IN THE FORTHCOMING 20 YEARS OR NOT ?
20 years is a long time and by that time China would have leapfrogged in nuclear weapons delivery and arsenal (Even today it is ahead by roughly 4 times).
Only our defense scientists can answer IF we can go ahead with supercomputer stimulation of nuclear tests or we need to have REAL TESTS.
Once sign the deal, and invest billions of dollar on uranium based ractors, you would'nt want sudden stoppage of uranium supplies or spares etc.
