Sustainable Energy Without the Hot Air has a section on the relative danger levels of various sources of electricity. I think we can assume Japan is similar to

Sustainable Energy Without the Hot Air has a section on the relative danger levels of various sources of electricity. I think we can assume Japan is similar to Europe in terms of regulation and safety. http://www.withouthotair.com/c24/page_168.shtml http://www.withouthotair.com/c24/page_168.shtml And I should say that Sustainable Energy is the best book on this topic you can find and that it's free online.