Nuclear crisis: Radioactive fuel dumps pose new threat
17:45 15 March 2011
Environment
Michael Marshall, environment reporter
It looks like the damaged nuclear reactors at Japan's Fukushima Daiichi plant are being brought under control. But another threat is coming to the fore: storage areas - cutely referred to as ponds - full of spent fuel rods.
Temperatures have risen in three of the ponds, with one of them coming close to boiling point. That means the radioactive material trapped in the ponds could escape into the atmosphere, contaminating the region far more than the relatively small amount of radioactive material that has escaped so far.
The pools are housed on the top floors of the reactor buildings. Spent fuel rods are transferred to them as soon as they come out of the reactor itself, and are kept under water to cool them down and trap the radioactive material within them. Once they have cooled down enough, the rods are then transferred to outdoor pools for long-term storage.
It is the pools inside the reactor buildings that are causing the problem. Two of the reactor buildings - 1 and 3 - have lost parts of their roofs, thanks to the hydrogen explosions that have taken place over the last few days. While these explosions apparently did not damage the reactors within, they have left the pools exposed to the outside air.
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