On Reliability of Mechanical Logics and Its Applicationby Heki Shibata, Univ of Tokyo, Japan,
Abstract: 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: Failure analysis | Accidents | Safety | Islands | Valves | Power outage | Electrical systems
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