Verification of automated changeover swithcing unit by model checking

Kim Björkman, Janne Valkonen, Jukka Ranta

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    2 Citations (Scopus)

    Abstract

    Along with new NPP designs and modernization projects of ageing NPPs there is an ongoing transition from analogue to digital technology in I&C systems. Programmable digital logic controllers enable more complicated control tasks and, thus, exhaustive verification of such systems by traditional methods is a difficult task. This difficulty is emphasized in cases where digitally implemented systems are combined with old analogue systems. Model checking is a computer-aided method developed for formal verification of correct functioning of a system design by examining all possible behaviors of a model of the system. This paper examines the use of model checking for the verification of a changeover switching unit for a busbar and also summarizes past experiences of utilizing model checking in verification of I&C logic designs. The switching unit is composed of an analogue control logic and a digital malfunction protection relay. The system was analyzed using the NuSMV model checking tool tailored for analysis of systems with a large number of inputs. The case study of this paper expands a series of studies on the applicability of model checking for the verification of NPP automation systems by introducing the problem of state space explosion caused by timing properties. Previous case studies have clearly demonstrated the benefits of model checking in the verification and licensing of digital automation. The analysis of the switching unit demonstrated that model checking is also useful in the verification of I&C systems combining analogue and digital technology, regardless some limitations of the NuSMV tool.
    Original languageEnglish
    Title of host publicationProceedings of 7th International Topical Meeting on Nuclear Plant Instrumentation, Control and Human-Machine Interface Technologies, NPIC & HMIT 2010
    Place of PublicationLaGrange, Park, Illinois
    PublisherAmerican Nuclear Society (ANS)
    Pages1719-1728
    Volume3
    ISBN (Electronic)978-0-8944-8084-3
    ISBN (Print)978-1-6178-2266-7
    Publication statusPublished - 2010
    MoE publication typeA4 Article in a conference publication
    Event7th International Topical Meeting on Nuclear Plant Instrumentation, Control and Human-Machine Interface Technologies, NPIC-HMIT 2010 - Las Vegas, Nevada, United States
    Duration: 7 Nov 201011 Nov 2010

    Conference

    Conference7th International Topical Meeting on Nuclear Plant Instrumentation, Control and Human-Machine Interface Technologies, NPIC-HMIT 2010
    Abbreviated titleNPIC-HMIT 2010
    Country/TerritoryUnited States
    CityLas Vegas, Nevada
    Period7/11/1011/11/10

    Keywords

    • safety logic
    • model checking
    • verification
    • changeover switching unit

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