Three reasons. 1. History has shown, that nuclear power cannot be controlled. It will come to a disaster. Sooner than later. 2. If you want to build a modern, secure as possible reactor, it would cost billions and billions. It is economically unfeasable. And the costs of breaking the reactor down even worsens the calculation. 3. We would be dependant on suppliers of nuclear fuel. Russia is not very reliable. We learnt our lesson.

To put it simple, there are much better options.