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← ScienceWhich outcome occurs when reactor coolant lacks boron?
A)Increased chain reaction speed✓
B)Moderator subcooling increases rapidly
C)Fuel cladding cracks decrease acutely
D)Xenon-135 plate-out accelerates quickly
💡 Explanation
Without boron to absorb neutrons, fission _chain reaction_ accelerates because neutron moderation proceeds unhindered, therefore reaction rate will climb rather than remaining regulated; other options would arise by other effects.
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