(Continuation from yesterday)

To begin with, "system" should repeat the failures and there is no way except for learning many things from the failure.

Especially, social infrastructure system, sometimes run into big accidents, killing many people, in order to realize "ideal situation".

So, I believe that nuclear power plants will come to change "Super-Ultra safety system" through more than from several to over ten times of big serious accident (classes of "level 7" ), like Three Mile Island Nuclear Power Plant, Chernobyl nuclear plant and in Fukushima.

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There is no system that never causes an accident in the world.

Any system should be managed with being regarded "an accident will occur"

Please tell me the perfect-safe system from the beginning. even if the system works.

If there is such a system, I will change my mind in three second, as "going over" or "turnabou",

By the way, after the accident in Fukushima, the voice of technicians who had repeated self-criticism has not been heard recently.

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In any case, the GPS system, the Earthquake Early Warning System, and the SNS, even if they cause problems, should not have done as much as "to kill you".

Please look them, based on generous-hearted vision.