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104, see www.nrc.gov
There are 104 commercial nuclear power reactors in the US. See the related question below.
Many countries have nuclear reactors: United States, United Kingdom, Russia, China, France, Japan, India, Canada, Romania, Bulgaria, Hungary, etc.
There are 104 operating nuclear power reactors in the US, but many states do not have any whilst some like Illinois have a number. You can see a map at www.nrc.gov
104 operating reactors
There are 59 nuclear reactors in France.
There are many plans to build new reactors in Canada and the United States especialy, and other countries, such as India and China, also have plans to build new reactors, while many developing countries plan to build their first reactors. Reactors must be constructed near large bodies of water, however, as this is essential to their operation.
There are over 400 nuclear reactors around the world.
As of 2010, India has 20 Nuclear Reactors.
Most nuclear reactors are thermal-neutron reactors. A few fast breeder reactors have been built, but not many.
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.