A crack was found in the casing of the axle junction of the ceiling crane in the Spent Fuel Pool at Fukushima I Nuke Plant. I don't remember ever hearing about this facility, other than "everything is normal".
The crack, which wasn't found out until October 27, is about 5-millimeter wide, and goes all around the circumference of the casing.
From TEPCO's handout for the press (10/28/2011):
The Spent Fuel Pool currently contains 6,375 spent fuel rods, according to Asahi Shinbun (10/29/2011). The newspaper also says the crack is considered to have formed after the March 11 earthquake.