Which risk increases when spent nuclear fuel rods accumulate?

💡 Explanation

Criticality can occur via moderation as decaying fissile isotopes release neutrons, because neutron moderation increases the probability of further fission reactions. This amplifies neutron flux, therefore increasing criticality risk, rather than directly altering radioactive decay pathways like alpha or fusion.

• Which risk increases because of unavoidable limitations in a Carnot engine?
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