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The Fukushima 1 plant was equipped with 13 diesel back-up generators to power the Emergency Core Cooling System (ECCS), but all of these failed.
A hydrogen release is very much part of a meltdown scenario, and difficult to imagine hydrogen explosion scenarios on the scale of what was seen at Fukushima 1 that would not involve compromising the reactor pressure vessel:
Given the detection of radioactive caesium, which could only have come from inside exposed fuel rods beginning to burn, and the subsequent violent explosion, it is difficult to imagine scenarios not involving substantial destruction of the reactor.
Now - admittedly it looks like there's no independent monitoring, so unless there's still a TV crew a few miles away, anything could be happening.
The only way to be sure that the core is intact is to check radiation north of the plant.
But I think if there were a massive breach, the evacuees would be much hotter, and there would be thousands of radiation warnings, and not just a handful.
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