Functional safety

At industrial sites, the causes and consequences of hazards go well beyond technological aspects: they must be considered from financial, property, human and environmental perspectives.


At industrial sites, the causes and consequences of hazards go well beyond technological aspects: they must be considered from financial, property, human and environmental perspectives. The physical integrity of an industrial site is characterised by the compliance with industrial processes and the preservation of product integrity.

Functional safety, as introduced in standard IEC 61508, covers Automated Safety Systems and Safety Instrumented Systems used for risk prevention and the protection of humans, the environment, and the industrial facilities themselves. These systems respond to stimuli to maintain the safety of assemblies or to place them in a safe configuration, acting as interlocking mechanisms. The risk reduction level to be obtained is then quantified in a SIL (Safety Integrity Level).

Industrial risk

Our approach

The Assystem approach to functional safety covers all phases from the identification and characterisation of risks through to Maintenance in Operational Condition (MOC) of critical systems, and also includes their specification, design and turnkey integration.

Assystem has developed significant know-how organising maintenance teams (MOC/Third-party Application Maintenance) on-site for critical systems. In terms of the systems covered by standard IEC 61511 for example, these work teams intervene directly to ensure high levels of safety performance for these systems (safety integrity) and their monitoring.
There are many criteria that influence the nominal operations of a critical system (initial design choices, documentation, training of operational and maintenance personnel, obsolescence management, execution of preventive maintenance, physical and cyber security for the system itself and the associated utilities etc.).

Our assets

Industrial information and control systems

"Global security" approach

Multi-sector skills

Multidisciplinary expertise

Our solutions


Risk analysis

Identification and characterisation of hazards and risks (Preliminary Risk Analysis), determination of risk reduction levels (SIL).


Specification of automated and instrumented safety systems

Functional specification, definition of operation and maintenance modes, drafting of specifications etc.


Design, construction and integration of safety-related instrumentation & control systems

Respect of organisational restrictions dictated by standards and targeted safety performances (safety cycle), best-fit technological solutions, anticipation of operational and maintenance limitations etc.


Audit of existing systems to evaluate their integrity and efficiency

Evaluation of real SILs (analysis of conformity of architectures, component choices, management strategies for common modes, resilience to failure), analysis of organisational measures for operation and maintenance, implementation of dedicated monitoring functions etc.


Operation and Maintenance on critical functions

Preventive maintenance and periodic testing, diagnostics and corrective maintenance, obsolescence management, hardware/software configuration management, organisation and upkeep of skills, change management (regression tests, impact studies, documentation updates etc.).

Our projects

Functional safety ITER project

Functional safety for ITER project instrumentation and control systems

Radiation monitoring systems nuclear research

Radiation and environmental monitoring systems for nuclear research

Site protection nuclear experimental area

Site protection and functional safety for a nuclear experimental area

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