PWR = pressurised water reactor. BWR = boiling water reactor

I think you are talking about nuclear reactors. PWR is a Pressurized Water Reactor, and is the basis for most power generators. BWR is a Boiling Water Reactor. As the water is a major moderating component, controlling the speed and intensity of the nuclear reaction, the steam bubbles in a BWR can present a problem.

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A nuclear power reactor, mainly PWR and BWR types.

In the operation of nuclear power plants like PWR and BWR