In the context of the Fukushima Daiichi nuclear disaster, what if you could cover the overheating nuclear fuel with liquid aluminum? Aluminum is a good conductor of heat so that you could spray the surface with sea water to avoid melting. Would this solve the problems of decay heat and hydrogen generation? What if you alloyed the aluminum with neutron poisons such as hafnium or cadmium? Any other suggestions of something that you could cover the nuclear plant with to mitigate the problem?
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