An analysis has been performed to determine the heatup of spent fuel following a hypothetical accident involving drainage of the storage pool. The heatup has been found to be strongly dependent on the spent fuel decay time, the storage rack design, and the packing density in the pool, as well as the drainage level and the building ventilation characteristics. In particular, the prerequisite decay time to preclude failure of the cladding due to rupture or melting has been found to vary from <10 days for some storage configurations to several years for others. The potential for reducing this critical decay time either by making reasonable design modifications or by providing effective emergency counter-measures has been found to be significant.