There is corruption in EVERYTHING humans do. It becomes a question of level and seriousness. Tepco operates actual working power plants, they simply can not do that at all without a level of seriousness and responsibility I suspect you are unfamiliar with in your daily life and experiences.
What???????????
Are you saying all of these scandals over safety are acceptable???
Not just once..not just twice...not just three times...
Btw, here is an interesting article
http://www.nodeju.com/tepco-violates-workers-rights/8338/