On Reliability of Mechanical Logics and Its Application

by Heki Shibata, Univ of Tokyo, Japan,

Document Type: Proceeding Paper

Part of: Structural Safety and Reliability


Recently, most of logical circuits are understood to consist of electrical components and wiring, however, we are still using various types of mechanical logics at the end of the safety-related system. It is very famous that the Three-Mile Island accident occurred and developed by several causes including the relief valve which was stuck-open. Such a functional failure of mechanical components is mainly coming from a 'self-lock' phenomenon of links in general. This paper deals with the fundamental problems to evaluate the failure or stuck probability of a mechanical link using for safety-related components in NPPs.

Subject Headings: Safety | Failure analysis | Power outage | Accidents | Electrical systems | Probability | Power plants | Nuclear safety

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