First you have to build the right sort of reactor. You don't use large power reactors like PWR or BWR, because they have very thick pressure vessels operating at high pressure and introducing the...
Neutrons are produced in every fission of a U-235 nucleus, and the reactor is designed so that the number of neutrons in the active core is kept constant. This means that for every nucleus that is...
It is produced in the fuel rods by fission of the U235 nuclei. Each fission produces a certain amount of heat, and this is transferred to the water or gas which is pumped past the fuel, by contact...
Nuclear reactors have a large thickness of shielding (concrete mainly) around them which reduces any radiation outside the reactor to hardly more than normal background.