Nuclear Power Engineering
Commercial power generation from fusion reactor is not yet possible, because

Quantity of fuel required for initiating fusion reaction is prohibitively high
The fuel required (e.g. deuterium and tritium) is scarce
It is difficult to initiate fusion reaction
It is difficult to control fusion reaction

ANSWER DOWNLOAD EXAMIANS APP

Nuclear Power Engineering
Secondary cooling circuit is a must in molten sodium cooled fast breeder reactor for

Faster heat removal rate from the core
Achieving high degree of superheat in the steam
Lowering the coolant circulation pressure
Avoiding the mixing of water with radioactive sodium, as it may cause explosion

ANSWER DOWNLOAD EXAMIANS APP