Nuclear Power Engineering
Thermal shield is used in high powered nuclear reactors to

Slow down the secondary neutrons
Protect the walls of the reactor from radiation damage
Absorb the fast neutrons
Protect the fuel element from coming in contact with the coolant

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

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

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