10 July 2012, operators of the Onagawa nuclear plant in Miyagi Prefecture announced that their Reactor 3 fuel rod storage pool is damaged.

Tohoku Electric Power Company (not to be confused with Tokyo Electric Power Company, which runs Fukushima Daiichi) reported they discovered chips, cracks, and more than 12 missing pieces to the metal containers holding fuel rods in the pool.

They are now checking reactors 1 & 2 at the Onagawa nuclear power factory.  Government officials are concerned that the damage was caused by the March 2011 earthquake.

Tohoku-EPCo claims the fuel rods are not damaged.