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Which risk increases regarding reactor waste when isotopes decay?

A)Thermal neutron absorption cross-section rise
B)Formation of neutron-absorbing Xenon-135
C)Increased long-term radioactive waste volume
D)Reduced mechanical cladding component integrity

💡 Explanation

Longer-lived isotopes present in reactor waste generate heat because of radioactive decay, triggering self-heating. Therefore, an increased long-term radioactive waste inventory occurs, rather than prompt criticality concerns or cladding damage under normal conditions, which are managed separately.

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