A modelling framework for dynamic safety assessment

The concept of resilience is progressively making its way into the design, operation and management practice of complex engineering systems. The core of such trend lies with the integration of failure mechanisms in the modelling of systems since the very design phase, focusing on the ability to effi...

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Main Authors:	Silvia Tolo, Rundong, Sarah Dunnett, John Andrews
Format:	Default Conference proceeding
Published:	2021
Subjects:	Petri Nets Cyber Safety Reactor Nuclear Resilience
Online Access:	https://hdl.handle.net/2134/16740349.v1
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id	rr-article-16740349
record_format	Figshare
spelling	rr-article-167403492021-09-30T00:00:00Z A modelling framework for dynamic safety assessment Silvia Tolo (8446062) Rundong (Derek) Yan (5826980) Sarah Dunnett (1251444) John Andrews (2077024) Petri Nets Cyber Safety Reactor Nuclear Resilience The concept of resilience is progressively making its way into the design, operation and management practice of complex engineering systems. The core of such trend lies with the integration of failure mechanisms in the modelling of systems since the very design phase, focusing on the ability to efficiently absorb and rapidly respond to threats rather than merely avoid them. This is expected to overcome the limitations of traditional design against-failure approaches, whose efficiency is often undermined by the strong uncertainty associated with rare or hardly predictable hazards. However, the potential advantages such a theoretical shift delivers have not yet been matched by the availability of adequate numerical tools and methodologies targeting the challenges associated with resilience analyses. The current literature and engineering practice lack of a widely agreed upon methodology for the assessment of systems resilience, or even for the definition of its metrics. This study proposes a novel approach for the estimation of the dynamic response of complex systems to safety threatening perturbations, aiming at providing a solid base for the evaluation of system resilience. The framework proposed relies on the use of Petri nets to capture both the physics of the processes entailed by the system operation and its interaction with the technological installation. The framework is applied to a case-study focusing on the response of a CANDU nuclear reactor to cyber incidents hindering the correct operation of the reactor control system and hence resulting in a loss of regulation threatening the structural integrity of the nuclear fuel. 2021-09-30T00:00:00Z Text Conference contribution 2134/16740349.v1 https://figshare.com/articles/conference_contribution/A_modelling_framework_for_dynamic_safety_assessment/16740349 CC BY-NC-ND 4.0
institution	Loughborough University
collection	Figshare
topic	Petri Nets Cyber Safety Reactor Nuclear Resilience
spellingShingle	Petri Nets Cyber Safety Reactor Nuclear Resilience Silvia Tolo Rundong Sarah Dunnett John Andrews A modelling framework for dynamic safety assessment
description	The concept of resilience is progressively making its way into the design, operation and management practice of complex engineering systems. The core of such trend lies with the integration of failure mechanisms in the modelling of systems since the very design phase, focusing on the ability to efficiently absorb and rapidly respond to threats rather than merely avoid them. This is expected to overcome the limitations of traditional design against-failure approaches, whose efficiency is often undermined by the strong uncertainty associated with rare or hardly predictable hazards. However, the potential advantages such a theoretical shift delivers have not yet been matched by the availability of adequate numerical tools and methodologies targeting the challenges associated with resilience analyses. The current literature and engineering practice lack of a widely agreed upon methodology for the assessment of systems resilience, or even for the definition of its metrics. This study proposes a novel approach for the estimation of the dynamic response of complex systems to safety threatening perturbations, aiming at providing a solid base for the evaluation of system resilience. The framework proposed relies on the use of Petri nets to capture both the physics of the processes entailed by the system operation and its interaction with the technological installation. The framework is applied to a case-study focusing on the response of a CANDU nuclear reactor to cyber incidents hindering the correct operation of the reactor control system and hence resulting in a loss of regulation threatening the structural integrity of the nuclear fuel.
format	Default Conference proceeding
author	Silvia Tolo Rundong Sarah Dunnett John Andrews
author_facet	Silvia Tolo Rundong Sarah Dunnett John Andrews
author_sort	Silvia Tolo (8446062)
title	A modelling framework for dynamic safety assessment
title_short	A modelling framework for dynamic safety assessment
title_full	A modelling framework for dynamic safety assessment
title_fullStr	A modelling framework for dynamic safety assessment
title_full_unstemmed	A modelling framework for dynamic safety assessment
title_sort	modelling framework for dynamic safety assessment
publishDate	2021
url	https://hdl.handle.net/2134/16740349.v1
_version_	1797820977914052608

A modelling framework for dynamic safety assessment

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