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← ScienceWhich outcome occurs when uranium isotopes reach criticality?
A)Uncontrolled nuclear chain reaction✓
B)Moderator poisoning halts fission
C)Fuel rod embrittlement accelerates swiftly
D)Neutron flux damps promptly thus fission stops
💡 Explanation
An uncontrolled nuclear chain reaction occurs due to nuclear fission because each fission event releases neutrons. These neutrons trigger further fission, leading to exponential growth known as a neutron multiplication process, rather than a self-damping reaction, poisoning, or fuel damage.
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