TEPCO releases video footage of Fukushima Daiichi Reactor 3 spent fuel pool

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2. spent fuel rod tank (the moon pool)

These shots are underwater in or just above the spent fuel rod tank. There is no discernible glow characteristic of rods or fragments remaining in the tank itself. TEPCO should be able to confirm how many rods were in the tank prior to the seismic event.

One of the engineering flaws of the Fukushima facility was that the tanks were located far above ground level, parallel to the top of the reactor vessel to minimize the exposure when rods were being moved out of the reactor during refueling. Because of damage suffered, these tanks could rupture losing the water and exposing the rods which would start to heat up rapidly and potentially start to burn and releasing high levels of radioactivity into the air column to be carried by winds.