However they're "classified", some of them (ABWR, ESBWR) work by boiling water inside the core at atmospheric pressure and using the steam to turn a turbine, an

However they're "classified", some of them (ABWR, ESBWR) work by boiling water inside the core at atmospheric pressure and using the steam to turn a turbine, and some of them (AP1000, EPR) work by heating pressurized (borated) water inside the core, which then transfers heat to other (pure) water at a steam generator, which (pure) steam is then used to turn a turbine.