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Instrumentation and control systems.
A nuclear power plant, like any other industrial facilities, requires means for monitoring
and controlling its processes and equipment, called the Instrumentation and Control system.
AREVA designs and supplies instrumentation and control and electrical systems included in
the new reactors supply or to be installed in reactors during their modernization programs.
Control system: the overall design of the I&C system and associated equipment has to
comply with requirements imposed by the process, nuclear safety and operating conditions.
The Instrumentation and Control system comprises several subsystems with the electrical
and electronic equipment: sensors which supply measured data – pressure, temperature of the
primary circuit, the liquid level and transform physical data into electrical signals,
programmable controllers to process those signals, and drive the actuators. These systems,
based on a number of input data, provide automatic orders to ensure that process parameters
are kept within the range on which the safety is based or to trigger protection actions such as
reactor trip. In the control room, are centralized sufficient and relevant information and
remote control means to monitor the plants.
I&C architecture: a several level structure.
Inside the overall I&C architecture, each system is characterized depending on
- its functions (measurement, actuation, automation, man-machine interface) and
- its role in safety or operation of the plant. They are categorized into classes in
accordance with their importance to safety.
Level 0 – The Process interface comprises the sensors, and the switchgears which supply
measured data for control, surveillance and protection systems and for information of the
control room staff.
Level 1 – The “system automation” encompasses I&C systems to perform reactor and
turbo-generator protection, reactor control, surveillance and limitation functions, safety and
process automation.
Level 2 – The “process supervision and control” (level 2) consists of:
- the workstations and panels located in the Main Control Room, the Remote Shutdown
Station and - the Technical Support Centre, which are also called the Man-Machine Interface
(MMI), the I&C systems which act as link between the MMI and the «system automation”
level.
I&C and electrical systems.
Beyond the design, planning, purchase and implementation of new systems, AREVA
also addresses interface management, which is of key importance to process engineering
projects and modernization programs. AREVA also offers operator support for licensing and
certification activities.
Instrumentation and control. The leading TELEPERM XS digital system platform is
used to manage security and control systems. The quality of TELEPERM XS for all safety-
related systems has been demonstrated over the past 10 years in a wide variety of power
plants worldwide. TELEPERM XS User Group Meetings are held regularly to facilitate
experience sharing. In non-security related areas, AREVA also offers its clients technically
and economically optimized solutions. These solutions apply adapted technologies in the
context of partnerships with favored suppliers.
Electrical systems. In addition to designing and supplying electrical systems, AREVA
offers standard commercial products, such as lighting, alarm systems, physical monitoring
and access control equipment that are part of this portfolio of integrated products.
Managing system lifecycles. The aging of electrical system and command-control
components is a function of the thermal, mechanical and radiological load; this is especially
true in close proximity to a reactor. AREVA has developed a computer-assisted tool called
AUREST to calculate the remaining service life of electrical components and control systems.

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