Model-Checking Detailed Fault-Tolerant Nuclear Power Plant Safety Functions

Igor Buzhinsky*, Antti Pakonen

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

12 Sitaatiot (Scopus)
98 Lataukset (Pure)

Abstrakti

Model checking has been successfully used for detailed formal verification of instrumentation and control (IC) systems, as long as the focus has been on the application logic alone. In safety-critical applications, fault tolerance is also an important aspect, but introducing IC hardware failure modes to the formal models comes at a significant computational cost. Previous attempts have led to state space explosion and prohibitively long processing times. In this paper, we present an approach to model and formally verify protection functions allocated to one or several IC systems, accounting for hardware component failures and delays in communication within and between the systems. Formal verification is done with model checking, whose feasibility on such complex systems is achieved by utilizing the symmetry of IC systems: The components of the overall model that do not influence the checked requirements are eliminated, and the failing components are fixed. Generation of such abstracted models, as well as subsequent verification of their requirements and symmetry with the NuSMV symbolic model checker, is handled by a software tool. In addition, we explore how to specify formal requirements for systems of the considered class. Based on a case study built around a semi-fictitious nuclear power plant protection system that achieves reliability by means of redundancy, we demonstrate how failure tolerance of even detailed system designs can be formally verified.

AlkuperäiskieliEnglanti
Artikkeli8892461
Sivut162139-162156
Sivumäärä18
JulkaisuIEEE Access
Vuosikerta7
DOI - pysyväislinkit
TilaJulkaistu - 2019
OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

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