The weight using in the existing safety assessment method all is the artificial constant-value weight. The main shortcoming of this kind of weight is it is invariability, lacks pointed as well as subjectivity at will, but its basic flaw is its artificial subjectivity. In view of the basic flaw of the constant-value weight, the natural weight concept has been proposed and given a thorough research to in this article.
It is thought in this article that the factor affect the system safety sta...