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← ScienceWhich risk increases inside graphite-moderated nuclear reactors in the event of core overheating?
A)Violent supercriticality events occur
B)Xenon poisoning reduces reaction
C)Pressure vessel steel embrittlement accelerates
D)Graphite oxidation triggers runaway reactions✓
💡 Explanation
Graphite oxidation accelerates drastically at high temperatures because the *Arrhenius equation* governs reaction rate dependence on temperature. Therefore, runaway reactions and potential structural failure are more likely, rather than supercriticality events, which the control systems are designed to prevent.
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