核電站甚至以可能性極小的假想的最嚴重事故作為安全設計的依據，并加以縱深層層設防，確保安全。實際上發生最大假想事故的可能性較小。

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The nuclear power plant even use the most terrible imaginary accident which will happen in infinitesimal possibility as the basis of the safety design .And make it safe in depth,insuring security.As a matter of fact,the possibility of the imaginary accident is infinitesimal.差不多哦