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Engineering
Nuclear Engineering
Japan Earthquake: nuclear plants Fukushima part 2
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[QUOTE="Astronuc, post: 6822869, member: 15685"] I think "hard liquid mixture" simple means a very viscous material, perhaps shy of melting, where the material is not quite liquid, but has little strength/stiffness. In other words, in such a state, there is essentially no yield strength and the material flows, rather than creep. That usually a state of matter the mechanical/structural engineers would avoid. The statement about the "fuel debris containing a lot of metal melted first, at 1000-1300°C," is interesting because I'm not sure what 'metals' or rather alloys, that would be, unless it refers to some lower melting eutectic/eutectoid or mix of such. Type 300 stainless steels (e.g., 304/316) would have melting points about 1370-1400°C (~2500-2550°F), nickel alloys (e.g., X750, Inconel 718) slightly higher, and Zircaloy (1820-1850°C, ~3310-3360°F), and UO[SUB]2[/SUB] melts at ~2840°C (~5070°F); however, corium, a combination of alloy and metal oxides could have a lower melting point depending on types of metals and stoichiometry. Certainly, beyond 1400°C, such a hot mass from the core could melt the steel supporting structure and flow downward throught the pressure vessel (bottom head) and onto the structures underneath, e.g., pedestal. This would suggest that they did not get cooling water into the system. [/QUOTE]
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Japan Earthquake: nuclear plants Fukushima part 2
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