Which risk increases when a nuclear power plant's spent fuel cooling pond experiences prolonged power loss?

💡 Explanation

Fuel rod decay heat elevates the temperature; failure of the cooling system causes Zircaloy cladding water interaction, initiating rapid oxidation. This accelerates the cladding's release of hydrogen because radiative decay drives oxidation, therefore increases cladding failures rather than fission, which declines post-shutdown, or moderater radiolysis.

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