In a nuclear reactor undergoing fuel depletion, which outcome arises due to decreasing fissile material concentrations?

💡 Explanation

A reduced multiplication factor occurs because decreased fissile material reduces neutron production via nuclear fission. This lowers the chain reaction's sustainment which depends on adequate binding energies that promote fission; therefore, sustaining controlled fission decreases, rather than alternatives such as clad failures or radiolysis which are separate side effects.

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