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

Co2

pressurised water

mixture of water and steam

liquid metal

coolant itself

ferrite rod

graphite rod

liquid sodium metal