We can't run them safely can we?
From Japanese morons mixing liquid uranium in a bucket. Yes, a bucket and so untrained they had never heard of critical mass; unauthorised experiments in Ukraine, [ eventual death toll between 35,000 and 200,000 depending on who you believe]; idiot 'electricians' wiring up critical stuff to wrong polarity by guesswork; to Brits deliberately overheating a reactor to "seal the cracks in the graphite core." [ I kid you not! ]. It caught fire. It was air cooled. And it had a chimney....
Then again, coal stations releasing enough U235 to make 20,000 atom bombs every year.
Still, never mind, eh!?
Alan