WASHINGTON (AP) -- A U.S. science advisory report says Japan's Fukushima nuclear accident offers a key lesson to the nation's nuclear industry: Focus more on the highly unlikely but worst case scenarios.
That means thinking about earthquakes, floods, tsunamis, solar storms, multiple failures and situations that seem freakishly unusual, according to Thursday's National Academy of Sciences report. Those kinds of things triggered the world's three major nuclear accidents.
"We need to do a soul searching when it comes to the assumptions" of how to deal with worst case events, said University of Southern California engineering professor Najmedin Meshkati, the panel's technical adviser. Engineers should "think about something that could happen once every, perhaps 1,000 years" but that's not really part of their training or nature, he said.
"You have to totally change your mode of thinking because complacency and hubris is the worst enemy to nuclear safety," Meshkati said in an interview.
The report said the 2011 Japanese accident, caused by an earthquake and tsunami, should not have been a surprise. The report says another Japanese nuclear power plant also hit by the tsunami was closer to the quake's fault. But the Onagawa plant wasn't damaged because quakes and flooding were considered when it was built.
Onagawa had crucial backup electricity available for when the main power went down, as opposed to Fukushima which had emergency generators in a basement that flooded. Onagawa's operators had "a different mindset" than the executives who ran Fukushima, Meshkati said.
The other two nuclear accidents -- at Pennsylvania's Three Mile Island and Ukraine's Chernobyl-- were caused by multiple system failures.