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Approximately 33%, depending on the design. That's measuring from reactor thermal power to final electric power.
Nuclear power amounts for a somewhat large portion of our the energy that we use. However, nuclear spills can be devastating. When a nuclear power plant leaks, radioactive material is released into the environment. This material is extremely harmful to humans and can cause many health problems and cancer. Radiation is spread through the air. It can take many years for the harmful material in the environment to go away. One of the most well-known nuclear accidents was the disaster at Chernobyl. Also, the Fukushima Daiichi nuclear power plant in Japan recently had a spill.
As of end of August 2013, there are 434 working nuclear power reactors (with total rated power 370.543 Gigawatt plus 69 nuclear power reactors under construction (with total rated power 67.196 Giagawatt).
Leo Szilard invented nuclear reactors in 1933 and patented the idea in 1934 (GB630726) however for many reasons nothing could be done with the idea until after World War 2.EBR-1 in the United States was one of the first experimental nuclear power plants. On December 21, 1951 it produced enough power to light the whole building.The worlds first nuclear power plant became operational on June 27, 1954 Obninsk Russia just outside Moscow.
How many people are needed to work at a coal power plant depends on the size and age of the plant, among other things.