1.it require more water.but many countries are scarce of water.
2.the waste material produced after production of energy cannot be disposed recklessly.because it is also radioactive in nature.
3.the lifes of workers in it have no security.
4.if the waste is disposed in water.the marine life get affected.
5.if explosion occurs like in fukushima in japan,the affect of the radiations will spread for miles together.till now after many years also the affect is seen in fukushima.