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
Coolant water is allowed to boil in the core of the reactor
Fuel and the coolant are thoroughly mixed to form a homogeneous solution

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

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

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