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

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

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Nuclear Power Engineering
A boiling water reactor is the one, in which the

Coolant water, after being heated in the reactor core, generates steam in a boiler
Pressurised water is pumped into the core
Fuel and the coolant are thoroughly mixed to form a homogeneous solution
Coolant water is allowed to boil in the core of the reactor

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