Which risk increases as a nuclear reactor enriches uranium isotopes?

💡 Explanation

Criticality risk increases because enrichment raises the concentration of fissile Uranium-235 via isotopic separation leading to easier sustained chain reactions; therefore a lower critical mass, rather than other issues related to materials or minor neutronics effects.

• Which outcome results when rapidly rotating black holes merge?
• Which outcome occurs when molten steel cools imperfectly?
• Which risk sharply increases when quantum dot size decreases?
• Which consequence results when unstable plasma confinement fails during fusion?
• Which consequence results when increased neutron moderation in a nuclear reactor occurs?
• Which outcome results when a catalyst poisons the active sites during irreversible reaction?