From an unexpected delay time in shutting down after the tsunami, they now think it will be 9 months before the site is reasonably safe Fukushima meltdown Whilst I am generally in favour that we need to develop the nuclear power option, the cost of worst possible scenario protection being built in has just gone through the roof.
The nuclear industry will always have to be underwritten by governments as a last resort............not unlike the banks!
There is already talk of the Japanese power company being nationalised, as the final cost after litigation will be crippling for any commercial company.
As for envisaging the worst case scenario before the event and having safety measures in place to overcome it, I don't think we are capable of overcoming the forces nature can throw at us or the errors of human nature.
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