Japan: Accidental water flow into spent fuel pool averted melt down

As we have learned from other reports the spent fuel pool damaged by events surrounding the March 11, 2011 earthquake and tsunami, the spent fuel pool in the #4 reactor building at TEPCO's Fukushima #1 nuclear power plan contains several nuclear cores. I suppose that could have made things much worse, I assume, than the melt down of the single cores in the three working reactors at Fukushima that did melt down and through. The report doesn't actually explain just how bad that could have been.  http://bit.ly/lwrMfI