1. No one wants a nuclear reactor in their back yard
2. Making a safe nuclear reactor takes skilled engineers
3. The only country with those skills in europe are in france (The UK folk have all mostly retired now)
4. Oil companies have been known to fund the likes of Greenpeace and CND to promote fear about nuclear power/weapons
5. Nuclear has a longer ROI than Fossil fuels, but rapidly overtakes the profits when it reaches ROI Investors want to make a quick buck.
6. Investment into safer nuclear reactors has been choked for many of the above reasons
7. Even without reprocessing, nuclear is an order of magnitude less damaging to the environment than Oil/Gas