 Water line will be at some preset value, and then sprays and boilers within the pressurizer can be used to control pressure and water level.The unique aspect of this is that the pressurizer is of much greater volume than current plants, which helps to keep the pressure constant in accident situations.Water from the secondary (the water that is turned into steam and used in the turbine) enters at the bottom of the steam generators, and goes up through a helical coil to the top.