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← ScienceWhich risk increases when a reactor uses unenriched uranium fuel?
A)Neutron moderation becomes less efficient✓
B)Critical mass decreases negligibly later
C)After-heat experiences rapid thermal runaway
D)Xenon poisoning occurs briefly then diminishes
💡 Explanation
Neutron moderation becomes less efficient because unenriched uranium contains a higher proportion of uranium-238, which absorbs neutrons without fission. Therefore chain reactions are harder to sustain because neutron flux decreases, rather than thermal runaway that occurs with insufficient cooling.
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