uses graphite rods as moderator

has powerful moderator

has no moderator

uses ferrite material as moderator

power generation

nucleonic devices

nuclear fission

medical field.

90% U-235

U-238

U-235

Pu-239

electrons

protons

neutrons

atom.

for boiling pi water in the core

to use liquid sodium metal as coolant

to use intermediate coolant

to prevent the water coolant from boiling in the core