Community Research and Development Information Service - CORDIS


This paper reviews the main features of ISA, a concept developed as a result of previous work on safety assessment and dynamic reliability. The method links the dynamics of the facility with its operating environment, subject to transitions between different time evolutions due to failures and/or system/operator interventions. For situations dominated by deterministic transitions (i.e., transitions upon deterministic demands as a result for instance of exceeding automatic-actions/alarm setpoints), the methodology can be considered an extension of PSA and accident analysis techniques that replaces the static event tree with a deterministic dynamic event tree (DDET) concept based on the theory of probabilistic dynamics. The paper also summarises some results of an ISA application to the assessment of the emergency operating procedure (EOP) of a PWR-W to mitigate the steam generator tube rupture (SGTR) initiating event.

Additional information

Authors: IZQUIERDO-ROCHA J M, Consejo de Seguridad Nuclear, Madrid (ES);SANCHEZ-PEREA M, Consejo de Seguridad Nuclear, Madrid (ES);COJAZZI G, JRC Ispra (IT)
Bibliographic Reference: Paper presented: IV Topical Meeting on Nuclear Technology, Operations and Safety, Hsin-Hua (TW), April 5-8, 1994
Availability: Available from (1) as Paper EN 38292 ORA
Record Number: 199410630 / Last updated on: 1994-11-28
Original language: en
Available languages: en