What can happen when a fission chain reaction gets out of control? This can cause a loss of heat. This can cause an explosion. This can cause extreme cooling of radioactive waste. This can cause a rapid decrease in pressure. This can cause neutrons to combine to form new atoms.

When a fission chain reaction gets out of control this can cause an explosion. Typically, fission chain reactions are regulated by control rods in a nuclear reactor. However, in cases of accidents, these chain reactions release high energies very quickly. This leads to explosions and other life-threatening incidents.