| 1 | Alright, next time we'll do chain reactions. | |
| 2 | For this reason these substances cannot sustain a chain reaction . | |
| 3 | The chain reaction that actually runs the reactor can be shut off in a matter of seconds. | |
| 4 | A surge of power caused a chain reaction that set the reactor core on fire. | |
| 5 | When the control rods are inserted into the core, they absorb neutrons and stop the fission chain reaction. |