Beyond Design Basis Events
As Fukushima showed, external threats — such as earthquakes, tsunamis, fires, flooding, tornadoes and terrorist attacks — are some of the greatest risk factors for a serious nuclear accident. Yet, nuclear plant operators have normally considered these accident sequences (called 'beyond design basis' events) so unlikely that they have not built in complete safeguards.
Forecasting the location of the next earthquake or the size of the next tsunami is an imperfect art. Nuclear plants situated outside known geological danger zones "could pose greater accident threats in the event of an earthquake than those inside, as the former could have weaker protection built in". The Fukushima I plant, for example, was "located in an area designated, on Japan's seismic risk map, as having a relatively low chance of a large earthquake and tsunami; when the 2011 tsunami arrived, it was in excess of anything its engineers had planned for".
Read more about this topic: Nuclear Safety
Famous quotes containing the words design, basis and/or events:
“The reason American cars don’t sell anymore is that they have forgotten how to design the American Dream. What does it matter if you buy a car today or six months from now, because cars are not beautiful. That’s why the American auto industry is in trouble: no design, no desire.”
—Karl Lagerfeld (b. 1938)
“Buddhists and Christians contrive to agree about death
Making death their ideal basis for different ideals.
The Communists however disapprove of death
Except when practical.”
—William Empson (1906–1984)
“When the course of events shall have removed you to distant scenes of action where laurels not nurtured with the blood of my country may be gathered, I shall urge sincere prayers for your obtaining every honor and preferment which may gladden the heart of a soldier.”
—Thomas Jefferson (1743–1826)