I watched "Meltdown File.8 "Part 2: New revelations 12 years after the accident""
I guess I could call it "stupefaction".
I had to go through the experience of 'standing there, stunned, watching TV.
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I will summarize the gist of this program in three roughly different points.
(1) The water supply to the reactor that the firefighters literally "risked their lives" for accelerated the meltdown.
(2) "Venting" to reduce reactor pressure "should not have been done" at that stage
(3) However, (2) above caused the reactor pressure to drop, resulting in water being pulled up from the water reservoir, which was completely unexpected, and consequently cooling the dissolved fuel.
In other words -- the "best" choice at the time "led to the worst," and that "worst prevented further worsts" as a result.
For me, the biggest shock was, that,
"The situation that proceeded on its own, and then stopped on its own, completely beyond the intentions of the people controlling the system"
It is no exaggeration to say that this is a 'total defeat' for the engineers who control nuclear power.
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It is said that the power companies and the universities to which they outsource the operation of nuclear power plants conduct every conceivable accident simulation.
I know that the stress of coming up with such an accident scenario prior to conducting the simulation is an unimaginably painful task.
However, real accidents easily overcome such a huge number of simulation assumptions.
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As I have said in the past, control systems, whether for automobiles, airplanes, power plants, or rockets, gradually improve their safety and reliability through repeated failures.
However, only "nuclear power plants" cannot use this major principle of control systems.
Because, the return on failure is huge.
"Twelve years after the accident, 20,000 people are still living in evacuation shelters"
This is, of course, the tragedy of the current situation, however,
"In the worst case scenario of this accident, all of eastern Japan would have been a no-go zone"
No one can deny this.
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So I come to the same conclusion as usual.