It turns out that a bunch of tacit knowledge is required to build working nuclear weapons. The designs are not sufficient at all, and it does make sense that y

It turns out that a bunch of tacit knowledge is required to build working nuclear weapons. The designs are not sufficient at all, and it does make sense that you might be able to deter development by subtly leading developers down known dead-ends. http://www.au.af.mil/au/awc/awcgate/awc/2013_buffet.pdf http://www.au.af.mil/au/awc/awcgate/awc/2013_buffet.pdf > The Soviet and British programs, and in fact all subsequent nuclear programs, took longer to produce initial results than the original 23-month Manhattan Project. Each program involved hundreds to thousands of science staff and each faced substantial practical problems. MacKenzie and Spinardi posed that the spread of nuclear weapon capacity following the Manhattan Project progressed more along the lines of re-invention than technology transfer.