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The DYLAM approach for the reliability assessment of a system is essentially based on the systematic simulation of the physical process under study, both in nominal and in failed conditions, these last being triggered by embedded probabilistic algorithms in the DYLAM code. This coupling between deterministic and probabilistic approaches is necessary whenever the time constants of the system impose an integrated approach to the safety assessment. This is the case of the so-called failure delay systems in which the occurrence of a cut set causes a top event only after a significant time delay. In this paper the main features of the new version of DYLAM are presented with reference to a simple failure delay system for which an exact reliability assessment has been performed. The detailed comparison between the exact solution and the DYLAM estimate reveals the approximations of DYLAM and makes it possible to rate the accuracy of its solutions.

Additional information

Authors: COJAZZI G, JRC Ispra (IT);MELENDEZ E, Consejo de Seguridad Nuclear, Madrid (ES)
Bibliographic Reference: Paper presented: ESREL '93 - Safety and Reliability Assessment - an Integral Approach, München (DE), May 10-12, 1993
Availability: Available from (1) as Paper EN 37320 ORA
Record Number: 199310219 / Last updated on: 1994-11-29
Original language: en
Available languages: en
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