Question

What are the advantages and disadvantages of boiling water reactor?

Answer 1

The advantage is you skip one heat transfer piece, a very expensive one, the steam generator, and so you also can avoid the higher pressure in the primary coolant loop.

The disadvantage is more difficult to manage reactivity control, as the water level in the core can vary. You also have elimanated a level of safety, in that the turbine hall is running with water that has actually been in the nuclear core, so it is a bit more radioactive than in a PWR where the turbine halls are generally non-radioactive even with the plant at full power.