Question

guided practice a meltdown may occur in a nuclear power plant when ______. a. the reaction is uncontrollable b. electricity demand is high c. control rods are lowered d. the fuel rods are spent

Explanation:

A nuclear meltdown happens when the nuclear fission reaction becomes uncontrollable, leading to overheating of the reactor core that can damage fuel rods and cause a release of radioactive material. Lowering control rods (option C) slows or stops the reaction, high electricity demand (option B) does not directly cause a meltdown, and spent fuel rods (option D) are no longer actively undergoing high fission reactions that would trigger a meltdown.

Answer:

A. the reaction is uncontrollable