Authorities looking for ways to prevent fuel-rod storage pool at Reactor No. 4 from collapsing (nytimes)

Hidehiko Nishiyama, the deputy director general of the Nuclear and Industrial Safety Agency, said that the authorities were looking for ways to shore up the bottom of the spent uranium fuel-rod storage pool at Reactor No. 4 to prevent it from collapsing.

http://www.nytimes.com/2011/04/21/world/asia/21japan.html?_r=2&ref=world