Nuclear is not that complicate it mustly has to do with uranium enrichment is all. This is caused by a displacement of electrons which can be caused by a conductive metal or magnetic energy. It need to be at a slow enough rate that it is not pulling and has a slow pull in order for it to successful. It is a thing that is needed in order to well have the distances place or set for this based on the level of conductivity. It is then similarly used like medical devices to mix things more easily and efficiently. Some things take longer fully blend into eachother this is a similar type of idea in this way just in a far less destructed manner.
Beyond this it is only need that a partial collides in a way to displace enough or the elections and split the atom so to speak being already in a higher unstable form already but stable enough in solid form with other protective elements around it to ensure it does not accidentally go off in ways. This is partially in ways of how much they enrich the uranium as they have different levels things for nuclear power vs full weaponization