Since "pollution" is stuff you don't want in a place where you don't want it then the answer is pretty much "none". Nuclear reactors produce several tons of spent fuel each year which is highly radioactive but it is kept under tight controls as the radioactivity decays and the spent fuel cools thus it isn't "pollution" in this sense because it doesn't get out where you don't want it.
Nuclear plants do discharge slightly warmer water than they intake which could be described as pollution if it were shown to harm the environment. Generally, the local animals appreciate the warmer water.
heat
There is smoke pollution from the reactor itself, in addition to the large trouble of disposing of the highly toxic nuclear waste.
there are no bad things about the nuclear power reactors
Fast neutron nuclear reactors, among other new Nuclear technologies. Nuclear power is the cleanest most efficient power source. Reducing burning of fossil fuels will significantly reduce pollution in the atmosphere.
In nuclear reactors
No, at least not for power reactors
The pumps that were supposed to keep the nuclear reactors cool failed to work because the earthquake broke them
The Fukushima nuclear power plant is a complex of six nuclear reactors located in Fukushima, Japan. It experienced a severe nuclear disaster in March 2011 after a tsunami triggered by an earthquake caused meltdowns in three of its reactors, releasing a significant amount of radioactive material into the environment.
No substitute for nuclear power reactors especially if there is no available fossil fuel.
No, they don't. All Pakistan nuclear power reactors are imported from outside.
No. Our reactors are fission reactors. We haven't yet mastered fusion reactors for power.
France (having 58 nuclear power reactors and one under construction) with around 80% of its electricity is produced by nuclear power.