BREAKING: Fukushima Daiichi No. 4

TEPCO is reported as being very concerned about the spent fuel pool at No. 4 plant, making the statement that "chances of recriticality of these elements is not zero."

This is exceedingly rare -- the worry that spent fuel in a pool like this could achieve any sort of chain reaction. Normally fuel elements in this type of storage are so far subcritical as a group that there is no worry.

The company is considering helicopters spraying boric acid as a remedy to the situation at No. 4 plant's fuel storage pool.

Developing.

ATOMIC POWER REVIEW 8:50 PM Eastern Tuesday 3/15

UPDATE 10:30 PM Eastern Tuesday 3/15- Cabinet Secretary Edano says that while anything is possible, this eventuality is very highly unlikely. As we thought.