Patent Number: 
Section: claims

1. A passive fire response system configured to suppress a metallic fire, the system comprising:a reservoir containing a non-aqueous, ionic liquid;at least one outlet in communication with the reservoir;a valve arranged between the reservoir and the outlet;a sensor configured to sense at least one of a hydrogen concentration and a temperature; anda controller configured to open the valve and release the ionic liquid if an output from the sensor indicates that the at least one of the hydrogen concentration and the temperature equals or exceeds at least one of a threshold hydrogen concentration and a threshold temperature,the passive fire response system configured to be used to suppress a metallic fire, the passive fire response system at least partially arranged in a steam generator building of a sodium fast reactor,wherein the controller is configured to trigger a first response to the fire in response to detection of the threshold hydrogen concentration at a first time, and to trigger a second response to the fire in response to detection of the threshold temperature at a second time, the first time being earlier than the second time, the controller further configured to increase a flow of the non-aqueous, ionic liquid upon detection of the threshold temperature at the second time, such that the flow is greater at the second time than at the first time. 2. The passive fire response system of claim 1, wherein the sensor is a temperature sensor. 3. The passive fire response system of claim 1, wherein the sensor is a hydrogen sensor. 4. The passive fire response system of claim 1, wherein the reservoir is located above the sensor. 5. The passive fire response system of claim 1, wherein a catch pan is positioned below the reservoir. 6. The passive fire response system of claim 1, wherein the controller is configured to open the valve when the temperature of at least about 75° C. is sensed by the sensor. 7. The passive fire response system of claim 1, wherein the controller is configured to open the valve when the hydrogen concentration of at least about 50 parts per hundred million is sensed by the sensor. 8. The passive fire response system of claim 1, wherein the passive fire response system is gravity driven. 9. The passive fire response system of claim 1, further comprising:a pump configured to pump the ionic liquid from the reservoir through the at least one outlet in response to an output from the controller. 10. The passive fire response system of claim 1, wherein the reservoir is refillable. 11. The passive fire response system of claim 1, wherein the valve is electronically actuated. 12. The passive fire response system of claim 1, wherein the ionic liquid is asymmetric and does not crystallize at room temperature. 13. The passive fire response system of claim 1, wherein the ionic liquid is liquid at room temperature. 14. The passive fire response system of claim 1, wherein the ionic liquid reacts with sodium to produce stable, non-reactive salt byproducts. 15. The passive fire response system of claim 1, further comprising:a temperature control system configured to maintain the ionic liquid in the reservoir at a temperature ranging from about 10° C. to about 30° C. 16. The passive fire response system of claim 1, wherein passive fire response system is configured to provide early detection of at least one of the temperature and the hydrogen concentration and to amplify release of the ionic liquid if a larger fire is detected. 17. The passive fire response system of claim 1, wherein heat and hydrogen accumulate and provide a localized temperature increase at the sensor.