Patent Number: 
Section: claims

1. A method of cooling a suppression pool of a Boiling Water Reactor (BWR), comprising:removing heat from the suppression pool by running cooling water through a cooling pipe, the cooling water having a cooler temperature than water in the suppression pool;attaching a single inlet pipe and a single outlet pipe to the cooling pipe, the inlet and outlet pipe extending beyond the confines of the suppression pool;fluidly connecting the inlet pipe to a water source located at an elevation above a liquid level of the suppression pool; andfluidly connecting the outlet pipe to a water discharge location located at an elevation below the suppression pool,the running of the cooling water through the cooling pipe occurring via gravity draining. 2. The method of claim 1, further comprising:maintaining a pressure of the cooling water in the cooling pipe above the pressure of the suppression pool water. 3. The method of claim 1, further comprising:producing a natural convection within the suppression pool, by positioning portions of the cooling pipe above a bottom floor of the suppression pool and below a liquid level of the suppression pool. 4. The method of claim 1, further comprising:fluidly connecting the inlet pipe to a water source,connecting a pump to the inlet pipe, andelectrically connecting a back-up diesel generator to the pump. 5. The method of claim 4, further comprising:positioning the pump, and all controls for the pump, in a location that is remote from the suppression pool. 6. The method of claim 1, further comprising:providing branching and fins on portions of cooling pipe. 7. The method of claim 1, further comprising:anchoring portions of the cooling pipe to a wall of the suppression pool. 8. The method of claim 1, further comprising:inserting a second cooling pipe into the suppression pool, andremoving more heat from the suppression pool by running cooling water through the second cooling pipe, the cooling water having a cooler temperature than the suppression pool water. 9. A system of cooling a suppression pool of a Boiling Water Reactor (BWR), comprising:a cooling pipe, with portions of the cooling pipe being positioned below an expected liquid level of the suppression pool,a single inlet pipe attached to the cooling pipe,a single outlet pipe attached to the cooling pipe,the inlet and outlet pipe extending beyond the confines of the suppression pool,a water source fluidly coupled to the inlet pipe, the water source being located at an elevation above the expected liquid level of the suppression pool,a water discharge point located at an elevation below the suppression pool,the cooling pipe configured to provide a flow of cooling water through the cooling pipe via gravity draining, the cooling water being a higher pressure and cooler temperature than the suppression pool water. 10. The system of claim 9, further comprising:a pump connected to the inlet pipe, anda back-up diesel generator electrically connected to the pump. 11. The system of claim 10, further comprising:controls electrically connected to the pump,wherein the pump, and the controls for the pump, are positioned in a location that is remote from the suppression pool. 12. The system of claim 9, wherein the cooling pipe includes branches and fins. 13. The system of claim 9, further comprising:one or more anchors connected to a wall of the suppression pool, to support the cooling pipe. 14. The system of claim 9, further comprising:a second cooling pipe, with portions of the second cooling pipe being positioned below the liquid level of the suppression pool,the second cooling pipe configured to provide a flow of cooling water through the cooling pipe that is a higher pressure and cooler temperature than the suppression pool water. 15. A system of cooling a suppression pool of a Boiling Water Reactor (BWR), comprising:the suppression pool located in a reactor building,a spent fuel pool located in the reactor building, anda cooling pipe, with portions of the cooling pipe being positioned below an expected liquid level of the suppression pool,a single inlet pipe attached to the cooling pipe,a single outlet pipe attached to the cooling pipe,the inlet and outlet pipe extending beyond the confines of the suppression pool,a water source fluidly coupled to the inlet pipe, the water source being located at an elevation above the expected liquid level of the suppression pool,a water discharge point located at an elevation below the suppression pool,the cooling pipe configured to provide a flow of cooling water through the cooling pipe via gravity draining, the cooling water being a higher pressure and cooler temperature than the suppression pool water.