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UO2 melts at 2865 degrees C or 5189 degrees F. However, most UO2 fuel is clad in Zircalloy which is more limiting. At temperatures above 2200 degrees F, the exothermic reaction of Zr with oxygen accelerates dramatically and will cause failure of the clad and likely melting of the UO2 fuel.

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Q: What is the melting temperature of UO2 fuel?
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