All the spent fuel for the site is stored in reactor building 4.
The Spent Fuel pool is now the biggest worry, it is NOT in a containment vessel, it is exactly what it sounds like, A POOL. If the water boils off, the rods will be exposed to air and will melt, releasing huge amounts of radiation.
Magnitude of Shizuoka quake revised upward to 6.4 from 6.0 (00:00