some, also the navy deliberately sunk some because it was believed to be a safe disposal method at the time. exact counts are probably classified. Try a FOIA request or a MDR request.
Most nuclear reactors are thermal-neutron reactors. A few fast breeder reactors have been built, but not many.
There are 59 nuclear reactors in France.
There are over 400 nuclear reactors around the world.
As of 2010, India has 20 Nuclear Reactors.
Sweden currently has 3 active nuclear power plants with 10 reactors.
Radioisotopes for many uses (e.g. medical, industrial, scientific) are produced in nuclear reactors.
Well, you don't let them near nuclear reactors, but, if it did happen, they would probably die of radiation. Anyway, not many animals are near nuclear reactors.
There are currently (year 2013) 31 countries having nuclear power reactors. The rest are not having nuclear power.
104 operating nuclear reactors
In nuclear reactors used to generate electricity, and in many nuclear warheads.
There are 100 nuclear power reactors operating in USA besides five under construction as of July 2014.
Present 2013. None. All are active. Fukushima has been 'Decommissioned'.