Fukushima = Stuxnet job. Quoting: Anonymous Coward 42393398
Yes - Stuxnet affected Seimens operating systems. Iran had Seimens, so did Germany, so did Japan.
Stuxnet was reported in Japan in December 2010.
Tepco, for reasons that have remained unexplained, took down it's backup systems in January 2011.
March 2011 - tsunami hits. Reactors survive quake & tsunami and all hell breaks loose after they attempt to turn on back-up systems (Stuxnet affected centrifuges during re-starts; going to back-up is Re-start)
Reactors meltdown & both Japan & Germany take all of their reactors off-line (the two countries that use Seimens operating systems are the only two countries that shut down all their reactors in response to Fukushima & kept them off-line)
Stuxnet has a built in kill switch; a turn off date. Japan begins restarting it's reactors one week after that date.
Pretty obvious, isn't it?