they are consructed in secret military sites .but this is just a wild guess
Basically, nuclear energy is used in two ways: * In nuclear reactors, to generate electricity. * In nuclear bombs (atom bombs) to cause destruction on a large scale.
There is no way to know if nuclear bombs will be used or exactly where they will fall if they are; however, it is safe to assume if they are used, they will be targeted toward areas where there are large populations or key military or infrastructre areas.
Nuclear bombs are so powerful, and release so much radioactive fallout, that any large-scale use of nuclear bombs would kill everbody and make the world uninhabitable.
Using large, nuclear weapons, eg. Bombs
They manufactured their own munitions - they had large factories dedicated to production of bombs, bullets etc.
Parts were assembled in many locations across the country, but final assembly was usually at PANTEX outside Amarillo, TX.
Enough of either U235 or PU239 to form a critical mass and hence a large explosion
Several sites existed, especially for components. The main assembly site for most of the cold war was PANTEX near Amarillo, TX.Early sites included:Los AlamosKirkland AFB in Albuquerque, NMMost of the large Pacific test shots were assembled on Perry Island at Eniwetok atoll and then sailed on landing craft transports to the detonation location.
Fallout is any debris picked up by a blast or strong updraft when it returns to earth, it is not unique to nuclear bombs or even explosions, even large fires generate fallout it just isn't radioactive.
A single 1 MTon bomb will do it, or four 250 KTon bombs, or a thousand 1 KTon bombs, etc. However more smaller bombs can spread the damage wider than one large bomb.
Most people knows that several nuclear bombs will depopulate large amounts of persons therefore it is concidered a threath to humanity.
Nuclear weapons developed by the Manhattan project for the Allies were Fission weapons called Atomic bombs. Large scale Fusion weapons developed by Hungarian Edward Teller in USA after WW2 were called Hydrogen Bombs. However during 1942 the Nazis developed a hybrid fusion boosted fission weapon, in which hollow charge explosives were used to cause a plasma pinch, a kind of flash of neutrons to ignite a Fission explosion.