Abstract
Root cause analyses of system failures are important from a viewpoint of prevention of recurrence of the failures and occurrence of similar failures. Five-why Analysis and Fault Tree Analysis are most popular however these analysis results depend on the skill of the analysts strongly because these use brain-storming method. The authors have proposed a root cause analysis method using Dual Vee Model, which has given a guidance in space systems applications to analyze and therefore the result less depends on the skill of the analyst. This paper demonstrates the results of the application of the method to failures of Nuclear Power Plants. This paper also proposes a chart to identify systems to which the method can be applied.
