Nordic experience and experiments of modelling digital I&C systems in PSA

S. Authén, J. Gustafsson, Jan-Erik Holmberg

Research output: Contribution to conferenceConference articleProfessional


The OECD/NEA CSNI Working Group on Risk Assessment (WGRisk) has set up a task group called DIGREL to develop a taxonomy of failure modes of digital components for the purposes of probabilistic safety assessment (PSA). A parallel Nordic activity carried out a pre-study where a comparison of Nordic experiences and a literature review was performed. An existing simplified PSA model has been complemented with fault tree models for a four-redundant distributed and diversified protection system in order to study and demonstrate the effect of design features and modelling approaches. The model has been used to test the effect of different levels of modelling detail, CCF modelling, fail-safe principle and voting logic. The paper presents results of the experiments with the model.
Original languageEnglish
PagesPaper S5-9
Publication statusPublished - 2013
MoE publication typeNot Eligible
EventNordic PSA Conference - Castle Meeting 2013 - Stockholm, Sweden
Duration: 10 Apr 201312 Apr 2013


ConferenceNordic PSA Conference - Castle Meeting 2013


  • probabilistic safety assessment
  • digital I&C
  • reliability analysis
  • failure mode
  • taxonomy


Dive into the research topics of 'Nordic experience and experiments of modelling digital I&C systems in PSA'. Together they form a unique fingerprint.

Cite this