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The term risk management implies the use of safety analysis to verify that a technical installation is kept within acceptable safety margins over its life cycle, and especially since changes such as design modifications, changes in configuration and operation and ageing may affect it. Risk management is therefore considered equivalent to the ultimate goal of a living PSA. The paper presents a new approach to safety and reliability analysis, in which the plant model is realised by object-oriented knowledge bases (KBs) with multiple (hierarchical and functional) links between objects. The representation formalism used to describe what is known about the objects is a hybrid one, using the concept of frames, rules and inheritance. The approach stems from the experience gained in two major projects: the European Reliability Data System - in which the Component Event Data Bank (CEDB) and the Abnormal Occurrences Reporting System (AORS) were developed - and the STARS project, an international research project on the use of KB systems in safety and reliability analysis.

Additional information

Authors: BESI A, JRC Ispra (IT);POUCET A, JRC Ispra (IT)
Bibliographic Reference: Paper presented: Technical Committee Meeting on Safety and Reliability Improvements through Optimized Plant Maintenance, Wien (AT), June 22-24, 1992
Availability: Available from (1) as Paper EN 36941 ORA
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