Which critical assembly risk increases when neutron moderators fail?

💡 Explanation

A moderator slows neutrons, allowing increased Uranium-235 fission. When the moderation process stalls, neutron flux exceeds capture rates, leading to prompt criticality via uncontrolled chain reaction, because neutron moderation is crucial for controlled fission processes; therefore an uncontrolled chain reaction occurs, rather than any changes to emission, corrosion, or even temperatures.

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