Finally and only because a citizens' panel pushed very hard for this outcome:
Fukushima disaster: Ex-Tepco executives charged with negligence, BBC, February 29, 2016, http://www.bbc.com/news/world-asia-35684098
Three former executives at a Japanese power giant have been formally charged with negligence over the 2011 disaster at the Fukushima nuclear plant. The trio, formerly of Tokyo Electric Power Co (Tepco), will be the first to go to court over the incident. A citizen's panel ruled last year they should face trial, forcing prosecutors to pursue the case.