Symmetry Breaking in Model Checking of Fault-Tolerant Nuclear Instrumentation and Control Systems

Igor Buzhinsky (Corresponding Author), Antti Pakonen

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
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Abstract

One of the approaches to assure reliability of nuclear instrumentation and control (I&C) systems is model checking, a formal verification technique. Model checking is computationally demanding, but nuclear I&C systems have certain properties that simplify the verification problem. The most notable of these properties are redundancy (duplication of certain system parts in several divisions) and symmetry, which are the means of ensuring failure tolerance. In this work, we extend our previous method of model checking failure tolerance of nuclear I&C systems by proposing an automated symmetry breaking approach that utilizes these properties to simplify the verification problem. As a result, fewer failure combinations need to be checked. We evaluate this approach on a case study that encompasses three safety functions allocated to four I&C systems in the same I&C model.
Original languageEnglish
Pages (from-to)197684-197694
Number of pages11
JournalIEEE Access
Volume8
DOIs
Publication statusPublished - 29 Oct 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • formal verification
  • model checking
  • symmetry breaking
  • nuclear I&C systems
  • fault tolerance

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