This document concerns the study of a horizontal fail-safe system for the safeguard of the isolation system of ELSY (European Lead-cooled System) during a beyond design earthquake. The analyses are focused on the evaluation of the forces associated with the impacts of the reactor building against the retaining surrounding wall that can be used as fail-safe system. In order to reduce the intensity of the impacts, different values of the gap between the wall and the reactor building are tested and some options of placing a bumper system on the active side of the wall are evaluated. Linear and non-linear model of the isolation system are implemented into the ABAQUS code, applying respectively implicit and explicit analyses. The linear and non-linear behaviour of the isolators is modeled by using the spring-dashpot elements in the first case and the Cartesian connectors in the second. The results of the numerical analysis, aimed to check the dynamic behaviour of the isolation system during a beyond design earthquake, with and without the presence of the horizontal fail-safe system, are shown.

SILER Project "Seismic-Initiated events risk mitigation in LEad-cooler Reactors" Horizontal fail-safe system design for the safeguard of the ELSY isolation system during a beyond design earthquake

Scipinotti, Riccardo;Ferrucci, Barbara
2014-05-19

Abstract

This document concerns the study of a horizontal fail-safe system for the safeguard of the isolation system of ELSY (European Lead-cooled System) during a beyond design earthquake. The analyses are focused on the evaluation of the forces associated with the impacts of the reactor building against the retaining surrounding wall that can be used as fail-safe system. In order to reduce the intensity of the impacts, different values of the gap between the wall and the reactor building are tested and some options of placing a bumper system on the active side of the wall are evaluated. Linear and non-linear model of the isolation system are implemented into the ABAQUS code, applying respectively implicit and explicit analyses. The linear and non-linear behaviour of the isolators is modeled by using the spring-dashpot elements in the first case and the Cartesian connectors in the second. The results of the numerical analysis, aimed to check the dynamic behaviour of the isolation system during a beyond design earthquake, with and without the presence of the horizontal fail-safe system, are shown.
Technical Report;Nuclear engineering;Seismic
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.12079/7687
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