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Engineering
Nuclear Engineering
Japan Earthquake: nuclear plants Fukushima part 2
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[QUOTE="Sotan, post: 6642815, member: 497173"] That expression - and those extraordinary images - puzzled me too, hence why I posted "does concrete melt in such a way that steel bars remain?". And was wondering of some chemical reaction too. But now I think it's rather a matter of "lost in translation". In an interview one worker says "it melted... or evaporated" (!). So I think what they intend to convey is more like "that concrete... disappeared". It's not there anymore. They don't really explain how it happened, just describe the result. This still leaves the question what happened exactly. But salt water, and I'm only talking intuitively, appears too benign to me to be able to cause such huge results (maybe I'm wrong). I am inclined to give credit to the spalling explanation that has been suggested. It's just that the spalling video and articles seem to speak of a more superficial or partial erosions of concrete, and again intuition tends to say what we see here is different. But maybe higher temperature, long contact time and the contact with a molten mass of metal (rather than hot air from a fire) over a long time kept the spalling process going... Still - how the concrete got cleaned so nicely away from the steel, I mean it's eery. So temperature did not exceed melting point of steel. How thick was that wall. Is the concrete gone everywhere, 360 degrees? Or just in portions? Is the whole thing now really supported by those steel bars only? High temperatures would not have weakened that steel dangerously? I suppose that is why they plan to continue investigations for the next 6 months. [/QUOTE]
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Japan Earthquake: nuclear plants Fukushima part 2
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