Part 4/9:
Control rods are essential for modulating the nuclear reaction; by absorbing neutrons, they're used to increase or decrease the reaction rate. If cooling systems fail—due to mechanical issues, natural disasters, or human error—temperatures can rise dangerously, resulting in a meltdown scenario. Meltdowns lead to extreme temperatures, melting fuel rods, and the potential for radioactive materials to be released into the environment, posing risks to human health and safety.