Load rejections are accommodated by a combination of several actions: rapidly running back the steam turbine to the new lower demand level, diverting the excess steam from the turbine to the main steam condenser unit or to the atmosphere if this is permitted by licensing regulations, and reducing reactor power via insertion of control rods without tripping the reactor. During this “house-load” operating mode, the reactor operates at a reduced power level that is still sufficient to produce enough electricity for its own needs, typically 5-8% of full power. Once the grid disturbance has been eliminated, the NPP can be re-synchronised to the grid, and its production quickly re-established to full power.