This problem was discovered and taken care of from the start of the development of modern nuclear weapon designs. See “strong link / weak link” and “always/neve

This problem was discovered and taken care of from the start of the development of modern nuclear weapon designs. See “strong link / weak link” and “always/never problem”, e.g. https://en.wikipedia.org/wiki/Strong_link/weak_link https://en.wikipedia.org/wiki/Strong_link/weak_link (I believe the diagram here is wrong, but it doesn’t require much thinking to deduce how the correct diagram should look like).