Patent Number: 
Section: claims

1. A method of passively cooling a spent fuel pool in a nuclear power plant absent of onsite and offsite power, wherein the spent fuel pool has an inner wall and an outer wall, the method comprising:spacing the inner wall and the outer wall of the spent fuel pool a distance apart substantially along a periphery of the spent fuel pool forming a gap,wherein, the gap contains air to impede a flow of heat from the spent fuel pool when passive cooling is deactivated;providing a heat sink;providing one or more conductive members having a first end and a second end;connecting the first end of the one or more conductive members to the gap and the second end to the heat sink; andactivating passive cooling of the spent fuel pool, comprising:adding water to substantially fill the gap;conducting heat generated from the spent fuel pool through the gap; andtransporting the heat from the gap through the one or more conductive members to the heat sink. 2. The method of claim 1, wherein adding water to substantially fill the gap, comprises:obtaining a water source;connecting a discharge header to the water source;discharging water from the water source into the discharge header; anddischarging the water from the discharge header into the gap. 3. The method of claim 2, further comprising installing in the discharge header a flow control valve having an open position and a closed position. 4. The method of claim 2, further comprising locating the discharge header at the top or near the top of the gap. 5. The method of claim 1, further comprising partitioning the gap into a plurality of channels. 6. The method of claim 5, further comprising installing in each of said plurality of channels a discharge header.