2015: Nuclear power stations are operated in 31 countries allover the world. With a total of 440 operated nuclear reactor. The reactors produce a net electrical power of 372210 MWe. There are 68 reactors under construction now. The USA has the largest number of nuclear reactors it has 104 reactors producing 101465 MWe. It is followed by France, Japan, Russia, Canada, United Kingdom etc. As shown in Table 1.