Which of the following events is most likely to directly cause a meltdown in a nuclear fission reactor?
A) The fuel rods become old and brittle.
B) The reactor is operated at too high a power.
C) The chain reaction slowly starts to get out of control.
D) Pumps that circulate water in the reactor fail.
E) Either B or C.

Question

Quizplus · Accepted Answer

A meltdown in a nuclear fission reactor is most directly caused by the failure of the cooling system, such as the pumps that circulate water. This leads to overheating and potential meltdown.

Which of the Following Events Is Most Likely to Directly