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← ScienceWhich outcome occurs when a thermal reactor surpasses temperature limits?
A)Core meltdown and steam explosion✓
B)Increased neutron moderation efficiency
C)Reduced criticality due to Doppler broadening
D)Elevated convective heat dissipation
💡 Explanation
Core meltdown occurs if temperatures exceed design limits because of runaway nuclear chain reaction. This leads to rapid steam creation and pressure buildup, triggering a steam explosion; therefore A, rather than increased neutron moderation or heat dissipation which would prevent meltdown.
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