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← ScienceWhich outcome increases risk during nuclear reactor startup?
A)Xenon-135 concentration increases uncontrollably✓
B)Increased core coolant flow stabilizes power
C)Fuel rod thermal expansion reaches limits
D)Control rod insertion rate speeds exponentially
💡 Explanation
Uncontrolled reactor startup risks neutron flux increases, because iodine-135 builds-up, then decays to Xenon-135. Therefore, neutron absorption increases and damps, rather than decreases; different isotopes mitigate the risk under controlled Ramp-Up conditions because of operator interventions.
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