No human injury 3. Explosion after inadequate actions on the drums 4. Reporting inaccurate information and forcing workers to tell a lie 5. Easy going from no accident and safe operation for long time Similar accidents in Belgium plant etc. One sometimes acts stupidly.
Technological judgment is essential in accident.
Two accidents had good luck rather. But they demonstrated where the problems were. Many lessons to be learned. Mistakes similar to those published in USA related to engineering practice must have occurred also in Japan. But currently it is difficult to disclose, analyzed and discuss some actual cases in Japan except those just described.