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概要

There are still exist human errors in operation and maintenance tasks in all business fields. Especially human errors in maintenance tasks are significant problems. For example, mixing of extraneous material in some components, faulty wirings, faulty maintenance of screw tightening torque, etc. are still major causes of accidents with maintenance. Thes e human errors are so small incidents that the author think they are not paid sufficient attention. So, the authors recommend risk assessment of maintenance task. Because befor e the maintenance, if maintenance workers know the risks of their tasks, they will execute tasks in a cautious manner. This paper introduces the author's risk assessment method.

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