In the United States, each reactor has to store its own spent fuel rods on their reactor's premises. Did you know that the NRC does not require backup power for the pool of spent fuel rods? Those rods may not be powerful enough to generate a profitable amount of steam power, but are still producing heat enough that if the cooling tank they are in went dry, they can self ignite? Take a look at the link in the above comments I listed, It will et your attention!!