Make a safer reactor, make it as safe as you want, some executive will ignore safety protocols because it costs too much
Per Wikipedia (who has sources)
"On 5 July 2012, the National Diet of Japan Fukushima Nuclear Accident Independent Investigation Commission (NAIIC) found that the causes of the accident had been foreseeable (so was Chernobyl), and that the plant operator, Tokyo Electric Power Company (TEPCO), had failed to meet basic safety requirements such as risk assessment, preparing for containing collateral damage, and developing evacuation plans. On 12 October 2012, TEPCO admitted for the first time that it had failed to take necessary measures for fear of inviting lawsuits or protests against its nuclear plants."
Meanwhile, TEPCO, while still being bailed out by Japanese gov, actually bragged about profits last year and is still running reactors.
It's not the technology that is the problem, it's the people, even if you could solve every other problem with this sort of power generation, the people in charge will find a way to screw it up because someone is always willing to cut a corner to make a buck.
By the way,
If you haven't followed it, early reports downplayed it heavily and people stopped paying attention (which was by design), however, as time has gone Fukushima has creeped up and now ranks a 7 on the nuclear disaster scale, a spot which only Chernobyl matches. Also, something that was kind of kept secret, they considered evacuating Tokyo. If they even considered causing that sort of panic and mass exodus you can bet it too is contaminated to at least some degree.
