- Graphite is used as a moderator.
- The purpose of the moderator is to absorb some of the kinetic energy of the neutrons to slow them down.
- This is because slow neutrons are more easily absorbed by uranium 235 nuclei.
- Made of boron or cadmium.
- The purpose of the control rods is to absorb neutrons and completely remove them from the fission process.
- Helps adjust the rate of nuclear fission in the reactor.