Patent Number: 
Section: claims

1. A method operating in conjunction with a pressurized water reactor (PWR) including a nuclear reactor core comprising fissile material disposed in a reactor pressure vessel also containing primary coolant water, a pressurizer integral with or operatively connected with the reactor pressure vessel and configured to control pressure in the reactor pressure vessel, and a refueling water storage tank (RWST), the method comprising responding to a loss of heat sinking of the PWR by operations including:driving a turbine using steam piped from the pressurizer; anddriving a pump using the turbine to suction water from the RWST into the reactor pressure vessel. 2. The method of claim 1 wherein the driving of the pump comprises providing a common shaft mechanically connecting the turbine and the pump whereby the driven turbine rotates the common shaft to drive the pump. 3. The method of claim 1 further comprising:discharging steam piped from the pressurizer into a pressurized passive condenser; andconnecting the suction side of the pump to both the RWST and the pressurized passive condenser wherein the driving of the pump also suctions water from the pressurized passive condenser into the reactor pressure vessel.