Which outcome accelerates a fission chain reaction in uranium?

💡 Explanation

Increased neutron moderation raises fission probability because it enhances the likelihood of U-235 absorbing neutrons and undergoing nuclear fission following the neutron thermalization mechanism. Therefore, reactivity increases; rather than being suppressed by control rods or further cooling slowing down neutrons.

• Which risk increases significantly when transient overvoltages exceed semiconductor breakdown?
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