Which risk increases within fuel rods of a nuclear reactor approaching criticality?

💡 Explanation

An increase in reactivity causes increased fission, therefore neutron flux rises. Neutron absorption by Xenon-135 products via Iodine-135 decay causes the 'iodine pit' mechanism, rather than rods overheating immediately because thermal inertia exists and saturation temperature is not approached at such speed.

• Which consequence results when impurities distort a semiconductor's periodicity?
• Which outcome results when stellar iron fusion ceases within a supergiant star?
• Which mechanism increases drag when airfoil airspeed increases above a critical Reynolds number?
• Which physical effect diminishes fringes when imaging through turbulence with a laser?
• Which mechanism causes greater protein aggregation when pH decreases?
• Which effect degrades radar system performance when atmospheric coherence is reduced?