KalpakkamKalpakkam
Its name is Kalpakkam-1 situated at Kalpakkam in TamilNadu, India
kalapakkam
Kalpakkam
Kalapakkam
Kalpakkam has both Thermal reactor (Madras Atomic Power Station) and Fast Breeder Reactor -FBTR and PFBR (Under construction). In MAPS (thermal reactor) it is Heavy Water (D2O) Which acts as a coolant as well as moderator, where as in Fast Breeder Test Reactor (FBTR) and Prototype Fast Breeder Reactor (PFBR) Sodium (Na) is used as coolant. Since there should not any moderators for fast reactors D2O will not be used as coolant in fast reactors.
You may mean FBR - this stands for Fast Breeder Reactor
Dounreay PFR (Prototype Fast Reactor)
Thermal Breeder Reactors use moderators but Fast Breeder Reactors don't use moderator.
Moderator is not used in case of fast breeder reactor because there is no need to slow down neutron energy. Nuclear fission takes place at high energy of neutrons.
The main disadvantage is the positive temperature coefficient of reactivity.
GEAR