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This paper shows how DYLAM (DYnamic Logical Analytical Methodology) developed for studying the dynamic reliability of plants, can be extended to the analysis of control and safety systems in consideration of man-machine interaction and human errors. The cases under study are related to the management of the Chemical and Volume Control System (CVCS) of a nuclear power plant. The nature of the CVCS is well suited for the present study because its dynamic behaviour is controlled by automatic regulation, with alarms and protections, as well as by manual control. Three specific types of transient are analysed in the paper. They are namely: a loss of power accident with possible failure of components and no operator intervention; a loss of power to the primary pumps with all components in normal behaviour and operator actions; and finally, the same case as above assuming failures of components and operator actions. In particular, the effect of stress and the capability of DYLAM to consider stress as a generator of errors as well as of possible recoveries is studied in detail. The results show the ability of DYLAM to adapt to different types of reliability analysis and in particular to the crucial domain of human reliability.

Additional information

Authors: CACCIABUE P C, JRC Ispra (IT);CARPIGNANO A, Politecnico di Torino, Dipartimento di Energetica, Torino (IT);VIVALDA C, Politecnico di Torino, Dipartimento di Energetica, Torino (IT)
Bibliographic Reference: Paper presented: 7th International Conference on Reliability and Maintainability, Brest (FR), June 18-22, 1990
Availability: Available from (1) as Paper EN 35336 ORA
Record Number: 199011732 / Last updated on: 1994-12-02
Original language: en
Available languages: en