Unit 2 had been taken offline earlier that month for maintenance, and investigators later found unexpected wear on hundreds of tubes inside both units.

NPR: Calif. Reactors Might Be Retired If Restart Nixed

As a result, the firm has taken measures to try to turn around the fortunes of the unit, including cancelling services on loss-making routes and streamlining some of its maintenance operations and cutting jobs.

BBC: Qantas: Boeing compensation boosts first-half earnings

The dome in Unit 4, however, was removed in November 2010 and the fuel removed for reactor maintenance and to add new fuel rods.

FORBES: New Video From Fukushima Shows Containment Vessel Dome Amid Debris