So the first thing you do is convince everybody that it's dangerous. Equate power generation with bombs, make a big deal about radioactive waste that lasts for thousands of years as if that's more problematic than ordinary chemical waste which lasts indefinitely, that sort of thing.
Once you've got everybody good and scared, demand safety rules. Paranoid, highly bureaucratic rules. Rules with much higher standards than the rules we use for other industries with a similar risk profile. As much red tape as possible. Make it so you can't unclog a toilet without an engineering study supervised by a team of attorneys. Make everything as arduous and expensive as possible and if anybody objects, accuse them of compromising safety.
Then tell everybody that we shouldn't build nuclear because it costs too much.