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Expand, eventually to rupture, and first to release the gas that's already accumulated within spent fuel, and then as the uranium pellets in the fuel continue to heat up, more and more radioactive material will be squeezed out of the pellets, mostly in the form of cesium 137, which would be a gas at those temperatures. so if the fuel pool has gone dry, that would be a very hard condition to reverse. >> is there at that point a risk of explosion and do either of those matter at that point? >> well, there would be presumably a fire, because the metal around the fuel rods, which is zirconium will...

This would cause fuel rods to expand, eventually to rupture, and first to release the gas that's already accumulated within spent fuel, and then as the uranium pellets in the fuel continue to heat up, more and more radioactive material will be squeezed out of the pellets, mostly in the form of cesium 137, which would be a gas at those temperatures. so if the fuel pool has gone dry, that would be a very hard condition to reverse. >> is there at that point a risk or either of those matter at that point? >> well, there would be presumably a fire, because the metal around the fuel rods, which is z...

More radioactive material will be squeezed out of the pellets, mostly in the form of cesium 137, which would be a gas at those temperatures. so if the fuel pool has gone dry, that would be a very hard condition to reverse. >> is there at that point a risk of fire or explosion and do either of those matter at that point? >> well, there would be presumably a fire, because the metal around the fuel rods, which is zirconium will burn once it reaches a certain ignition temperature. so there could be a zirconium fed fire that would only serve to increase heat up of the rods and accelerate radioactiv...