Model-Based Analysis of an Arc Protection and an Emergency Cooling System

• Instrumentation and control (I&C) systems play a crucial role in the operation of nuclearpower plants and other safety critical processes. An important change that will be going on inthe near future is the replacement of the old analogue I&C systems by new digitalised ones.The programmable digital logic controllers enable more complicated control tasks than the oldanalogue systems and thus the verification of the control logic designs against safetyrequirements has become more important. In order to diminish the subjective component ofthe evaluation, there is a need to develop new formal verification methods.This report summarizes the work done in the MODSAFE 2007 project on two case studieswhere model checking techniques have been used to study an arc protection system and anemergency cooling system. Model checking tools offer typically a finite state machine basedmodelling language for modelling the system to be verified, a specification language(temporal logic) for expressing the properties to be verified and a set of analysis tools to checkthat the system satisfies the given properties. A state of the art open source model checkingsystem NuSMV was employed and using a reasonable effort it was possible to (i) model bothsystems on an adequate level, (ii) to formulate required safety properties in the specificationlanguage, and (iii) to perform a full verification of the properties using the NuSMV system.This indicates that current model checking techniques are applicable in the analysis of safetyI&C systems in NPPs.

Ämnesord

HUMANIORA  -- Filosofi, etik och religion -- Filosofi (hsv//swe)

HUMANITIES  -- Philosophy, Ethics and Religion -- Philosophy (hsv//eng)

Nyckelord

nuclear power plants

safety critical processes

instrumentation

control systems

programmable digital logic controllers

control logic design

safety requirements

formal verification methods

arc protection system

emergency cooling system

open source model checking systems

SAFIR 2010

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